Ludiras's questions

I am trying to upload an application to Google Play which has a version for mobile devices and also for Wear OS. I'm trying to upload it but when I upload the bundle and then want to activate it in version types to add the Wear OS bundle, it complains that the bundle has the same versionCode.

My question is... do I necessarily have to have different versionCodes in each one? Is there no way to upload the same package and have it also available for Wear OS or at least using the same versionCode?

I need to access a method through the context, but I have no way to access it since the module in which this method is located does not have visibility with the app module and I cannot give it to it either, since it would cause a circular dependency error:

private static synchronized String createDataPath(String path) {
    File fileDir = context.getExternalFilesDir(path);
    if (fileDir != null) {
        return fileDir.getAbsolutePath();

    } else {
        return null;
    }
}

Before, that context was taken by storing the context in a static variable, but this causes me a memory leak and I have already seen that it is not recommended at all to do it this way.

When I have had context problems, I accessed the instance of the Application class that provided me with a context, but in this case I cannot access the Application class because it is not in the same module.

The other option is to pass the context by parameter of the method but it is a project with hundreds of classes and methods, so passing the context by parameter would make it have to pass the context to all the methods that depend on it, thus creating a pyramid gigantic, and it is what I try to avoid, what other option do I have?

I'm using Constraint Layout with Compose to make a basic app that adds and subtracts numbers. The functionality works fine, the problem is when I want to add a margin between the elements of the view, that if I add a chainStyle of type Packed, it ignores them:

@Composable
fun CreateStructure() {
    var num by rememberSaveable { mutableStateOf(0) }
    val constraint = ConstraintSet {
        val valueLabel = createRefFor("valueLabel")
        val addButton = createRefFor("addButton")
        val subtractButton = createRefFor("subtractButton")
        val resetButton = createRefFor("resetButton")

        constrain(valueLabel) {
            top.linkTo(parent.top)
            start.linkTo(parent.start)
            end.linkTo(parent.end)
            bottom.linkTo(addButton.top)
        }
        constrain(addButton) {
            top.linkTo(valueLabel.bottom, 30.dp)
            start.linkTo(valueLabel.start)
            end.linkTo(valueLabel.end)
            bottom.linkTo(subtractButton.top)
            width = Dimension.value(200.dp)
        }
        constrain(subtractButton) {
            top.linkTo(addButton.bottom, 10.dp)
            start.linkTo(addButton.start)
            end.linkTo(addButton.end)
            bottom.linkTo(resetButton.top)
            width = Dimension.fillToConstraints
        }
        constrain(resetButton) {
            top.linkTo(subtractButton.bottom, 10.dp)
            start.linkTo(subtractButton.start)
            end.linkTo(subtractButton.end)
            bottom.linkTo(parent.bottom)
            width = Dimension.fillToConstraints
        }
        createVerticalChain(valueLabel, addButton, subtractButton, resetButton, chainStyle = ChainStyle.Packed)
    }

    ConstraintLayout(constraintSet = constraint, Modifier.fillMaxSize()) {
        Text(text = "Conteo: $num", Modifier.layoutId("valueLabel"))
        Counter(layoutId = "addButton", titleButton = "Sumar número") {
            num++
        }
        Counter(layoutId = "subtractButton", titleButton = "Restar número") {
            num--
        }
        Counter(layoutId = "resetButton", titleButton = "Resetear valor") {
            num = 0
        }
    }
}

I don't know if being Compose works differently, but using XML I created the views like this and when I added margins to chained views it added it to me without problems, so it's not a Compose bug or it's the behavior it has...

I'm trying to deserialize the response I receive from a service in XML format and I'm having problems since it tells me that the name is already repeated, but otherwise I don't know how I can do it... I'm sending you the error, the code and the XML which I need to deserialize.

org.simpleframework.xml.core.PersistenceException: Element 'channelLevel' is already used

<channels>
    <channelLevel ref="00000000-0000-1000-0000-000000000016">
        <id>001</id>
        <name>Max</name>
        <order>100</order>
        <country>MX</country>
    </channelLevel >
    <channelLevel refId="00000000-0000-1000-0000-000000000017">
        <id>001</id>
        <name>Max</name>
        <order>100</order>
        <country>MX</country>
    </channelLevel >
    <channelLevel refId="00000000-0000-1000-0000-000000000018">
        <id>001</id>
        <name>Max</name>
        <order>100</order>
        <country>MX</country>
    </channelLevel >
    <channelLevel refId="00000000-0000-1000-0000-000000000019">
        <id>001</id>
        <name>Max</name>
        <order>100</order>
        <country>MX</country>
    </channelLevel >
</channels>

@Root(name = "channels", strict = false)
data class ChannelsList(
    @field:ElementList(name = "channelLevel", required = false)
    var channelLevel: List<Channels>
)

@Root(name = "channelLevel", strict = false)
data class Channels(
    @field:Element(name = "id", required = false)
    var id: Int? = null,
    @field:Element(name = "name", required = false)
    var name: String? = null,
    @field:Element(name = "order", required = false)
    var order: Int? = null,
    @field:Element(name = "country", required = false)
    var country: String? = null,
)

I am with kotlin creating a password generator and I have come across the seeds but I have never known exactly what function they have, what is the difference between passing a seed to a random function with not passing anything to it? I suppose that internally it already has some, but I have never understood it well.

I'm trying to update an index inside an array that I have stored in Firestore, but when I pass the parameter it deletes everything and leaves me what I just added instead of updating that field, can you tell me what I'm doing wrong?

I would like to update, for example, inside the hoursList array, index 0, the field called "available". I have tried with this:

 firebaseFirestore.collection(APPOINTMENTS_PATH).document(selectedDay)
            .update(mapOf(
                "hourList.0.available" to false
            ))

I am using the Navigation Component, currently I have two graphs, the first one has an activity that shows the login screen and the registration screen, and from the login screen I navigate to a second graph with another activity that contains a navigation bar. The problem I have is that when I navigate from graph A to graph B, it's like it only shows me the content of what the loaded fragment of graph B would have, but it doesn't show the navigation bar:

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/nav_graph_home"
    app:startDestination="@id/homeFragment">

    <fragment
        android:id="@+id/homeFragment"
        android:name="com.ludiras.ameisin.ui.home.HomeFragment"
        android:label="fragment_home"
        tools:layout="@layout/fragment_home" >

        <action
            android:id="@+id/action_homeFragment2_to_profileFragment2"
            app:destination="@id/profileFragment2" />

    </fragment>

    <fragment
        android:id="@+id/profileFragment2"
        android:name="com.ludiras.ameisin.ui.profile.view.ProfileFragment"
        android:label="fragment_profile"
        tools:layout="@layout/fragment_profile" />
    
</navigation>

This is the method I use to navigate to the second graph:

private fun setupObservers() {
        viewModel.getEmailRegisterLiveData().observe(viewLifecycleOwner, Observer {
            val action = LoginFragmentDirections.actionLoginFragmentToHomeNavGraph()
            findNavController().navigate(action)
        })
    }

And in the first graph I have, in addition to the include with said graph, this action which is what allows me to navigate:

<fragment
        android:id="@+id/loginFragment"
        android:name="com.ludiras.ameisin.ui.login.view.LoginFragment"
        android:label="fragment_login"
        tools:layout="@layout/fragment_login">

        <action
            android:id="@+id/actionLoginFragmentToHomeNavGraph"
            app:destination="@id/nav_graph_home" />

        <action
            android:id="@+id/actionLoginFragmentToRegisterFragment"
            app:destination="@id/registerFragment"
            app:popUpTo="@id/loginFragment"
            app:popUpToInclusive="true" />

    </fragment>

The other solution I had thought of was to implement just one activity with only a graph and show and hide the bar where I need it, but I want to know if it is possible the way I am doing it with two graphs.

With this change in the Google console for developers, I'm a bit lost, when I went to review my application to upload it, I got the following:

Warning This APK contains Java or Kotlin code, which can be obfuscated. We recommend that you upload a deobfuscation file to facilitate analysis and debugging of ANR errors and crashes. More information

I have been looking for information on obfuscation and have read about proguard. I have activated it but when I go to Firebase, the names of the fields in my database have been shortened and they do not come out with their real name. I have read that for this I must upload the deobfuscation file together with the bundle that I upload to the store, but I cannot find the option to upload said file anywhere.

I'm taking a course on Kotlin coroutines and I've had a few questions about the scope. First of all, I understand that it GlobalScopeis linked to the life cycle, if the activity (for example) dies before the coroutine finishes, it throws an exception, correct me if I'm wrong.

I have also come across two ways to implement CoroutineScope, one would be to directly implement the interface and call get passing it the Dispatcher and the job, and the other that I have seen is creating an instance of it, what difference is there?

Finally, the other question I have is the method MainScopethat I have seen it used in some cases MainScope().launch, and from what I have seen it already provides you with one CoroutineScope, but when do I use one or the other? What is better?

I am looking at the scope functions in Kotlin (let, run, with, apply, also) and I have a doubt between apply and with. I've read that apply is used when the value needs to return itself, but what does this mean? Since seeing the codes is almost the same:

val mediaItem = MediaItem("Title 14", "", MediaItem.Type.PHOTO).apply {
    title = "Title 15"
    imageUrl = ""
    typeElement = MediaItem.Type.VIDEO
}

with(mediaItem) {
    title = "Title 16"
    imageUrl = ""
    typeElement = MediaItem.Type.VIDEO
}

The only thing I see is that with needs the object to be used and with apply we use it from this object, but it is not very clear to me, let's see if any of you can explain it to me.

I was doing a Kotlin course and this question arose: do all views have a context? It may be due to the lack of knowledge in understanding well and in a "simple" way what is the context in an Android app.

For example, I know that in an Adapter when we want to access the context we can access it through the holder provided by the onBindViewHolder method, but what is the difference of obtaining it through the itemView itself that can receive the ViewHolder class that we create in the adaptor? Or the difference of getting it through a setOnClickListener that we do to a button.

class ViewHolder(itemView: View): RecyclerView.ViewHolder(itemView) {

    private val mediaItemTitle: TextView = itemView.findViewById(R.id.mediaTitle)
    private val mediaItemImage: ImageView = itemView.findViewById(R.id.mediaThumb)

    fun bind(mediaItem: MediaItem) {
        mediaItemTitle.text = mediaItem.title
        mediaItemImage.loadUrl(mediaItem.imageUrl)

        itemView.setOnClickListener {
            itemView.context.toast(mediaItem.title)
        }
    }
}

Then another question arises: do all components of a view have a context? An ImageView, a TextView, and a CustomView that we call on our view too?

What ways are there to call the context and which are the safest without the risk of getting a leak. An easy way to get a context in an adapter would be to pass the context of the activity or fragment where we are going to use it as a constructor, but I know that this would cause a memory leak. Let's see if you can help me a little since I want to take note of these cases to know what would be the most optimal way in each possible case.

I have been reading about Retrofit and I have reached the point of the Headers and I don't know if I have understood them very well. In the course that I am doing, it uses them to establish an authentication with a user created in the backend and a database and it does it in two different ways:

private WebServiceBA() {

    loggingInterceptor = new HttpLoggingInterceptor();
    loggingInterceptor.level(HttpLoggingInterceptor.Level.BODY);
    httpClientBuilder = new OkHttpClient.Builder().addInterceptor(loggingInterceptor);

    httpClientBuilder.addInterceptor(chain -> {

        Request original = chain.request();
        Request.Builder requestBuild = original
                .newBuilder()
                .addHeader("Authorization", AUTH_USER)
                .method(original.method(), original.body());
        Request request = requestBuild.build();
        return chain.proceed(request);
    });

    retrofit = new Retrofit.Builder()
            .baseUrl(BASE_URL_BA)
            .client(httpClientBuilder.build())
            .addConverterFactory(GsonConverterFactory.create())
            .build();
}

In this first form I understand that you are passing the Header through code but I don't understand the .method(original.method(), original.body());. And in this one you are passing it through the Retrofit call itself:

@GET("/todos_profesores_admin")
Call<List<ProfesorBA>> listAllProfesorAdmin(@Header("Authorization") String authHeader);

I don't understand if the "Authorization" thing is something that should be like that since it's in the backend or it's a way to call it in the code.

I suppose that by doing it in the call, in this case we have more freedom since we pass the users that we want, but what other things can we send through the Header of a Retrofit call or how far does its usefulness extend? Thank you very much.

I have an application that I am making in order to practice MVVM. What this application does is simply call Retrofit and paint the data from a JSON into a RecyclerView. In the row of the RecyclerView I have a checkbox whose functionality is that if it is marked, pressing a button with u shows me those marked elements in another RecyclerView of another fragment. The problem is that when I mark a check, before sending it or anything, if I turn the screen, it's like the list is reloaded or I don't know very well what behavior it is doing, but the fact is that that checkbox is unchecked again and I want that even though I haven't sent those changes to Retrofit yet, that checkbox press remains:

This is my class for the view:

package com.example.menunavegacion.ui.fragments.tabs.fragmentpets.view;

....

public class FragmentPets extends Fragment {

    @BindView(R.id.recyclerView)
    RecyclerView recyclerView;
    @BindView(R.id.progressBar)
    ProgressBar progressBar;

    PetsViewModel mWordViewModel;
    PetsAdapter adapter;

    @Inject
    RequestInterface requestInterface;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_tab_one, container, false);
        ButterKnife.bind(this, v);
        initViews();
        return v;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mWordViewModel = ViewModelProviders.of(this).get(PetsViewModel.class);

        mWordViewModel.getAllPets().observe(this, new Observer<ArrayList<PetsDTO>>() {
            @Override
            public void onChanged(ArrayList<PetsDTO> petsDTOS) {
                adapter = new PetsAdapter(petsDTOS, getContext(), false);
                recyclerView.setAdapter(adapter);
            }
        });

        mWordViewModel.getLoadingLiveData().observe(this, new Observer<Boolean>() {
            @Override
            public void onChanged(Boolean loading) {
                if (loading) {
                    progressBar.setVisibility(View.VISIBLE);
                } else {
                    progressBar.setVisibility(View.GONE);
                }
            }
        });

        mWordViewModel.loadJSON();

        mWordViewModel.showFinishMessage().observe(this, new Observer<Boolean>() {
            @Override
            public void onChanged(Boolean aBoolean) {
                if (aBoolean) {
                    Toast.makeText(getActivity(), getActivity().getString(R.string.update_toast_message), Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(getActivity(), getActivity().getString(R.string.message_send_error), Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    @OnClick(R.id.btnSend)
    public void onSend() {
        mWordViewModel.updateList(adapter.getPetList());
    }

    private void initViews() {
        recyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext());
        recyclerView.setLayoutManager(layoutManager);
    }
}

This is my ViewModel:

package com.example.menunavegacion.ui.fragments.tabs.fragmentpets.viewmodel;

....

public class PetsViewModel extends AndroidViewModel implements ViewModelInterface.ViewModel {

    private PetsRepository mPetsRepository;
    private LiveData<ArrayList<PetsDTO>> mAllPets;

    public PetsViewModel (Application application){
        super(application);
        mPetsRepository = new PetsRepository(application);
        mAllPets = mPetsRepository.getAllPetsLiveData();
    }

    public LiveData<ArrayList<PetsDTO>> getAllPets() {
        return mPetsRepository.getAllPetsLiveData();
    }

    public LiveData<Boolean> getLoadingLiveData() {
        return mPetsRepository.getLoadingLiveData();
    }

    public LiveData<Boolean> showFinishMessage() {
        return mPetsRepository.getFinishMessage();
    }


    @Override
    public void loadJSON() {
        mPetsRepository.useCaseLoadJSON();
    }

    @Override
    public void updateList(ArrayList<PetsDTO> pets) {
        mPetsRepository.useCaseUpdateList(pets);
    }
}

This is the repository:

package com.example.menunavegacion.ui.fragments.tabs;

....

public class PetsRepository {

    LoadJSONUseCase loadJSONUseCase;
    UpdateListUseCase updateListUseCase;

    private MutableLiveData<ArrayList<PetsDTO>> allPetsLiveData = new MutableLiveData<>();
    private MutableLiveData<Boolean> loadingLiveData = new MutableLiveData<>();
    private MutableLiveData<Boolean> showFinishMessage = new MutableLiveData<>();

    public LiveData<ArrayList<PetsDTO>> getAllPetsLiveData() {
        return allPetsLiveData;
    }
    public LiveData<Boolean> getLoadingLiveData() {
        return loadingLiveData;
    }
    public LiveData<Boolean> getFinishMessage() {
        return showFinishMessage;
    }

    public PetsRepository(Application application) {
        loadJSONUseCase = new LoadJSONUseCase();
        updateListUseCase = new UpdateListUseCase();
    }

    public void useCaseLoadJSON() {
        loadJSONUseCase.loadJSON(new RepositoryInterface() {
            @Override
            public void showError(Boolean show) {
                showFinishMessage.postValue(show);
            }

            @Override
            public void onLoading(boolean loading) {
                loadingLiveData.postValue(loading);
            }

            @Override
            public void onSuccess(ArrayList<PetsDTO> data) {
                allPetsLiveData.postValue(data);
            }
        });
    }

    public void useCaseUpdateList(ArrayList<PetsDTO> pets) {
        updateListUseCase.updateList(pets, new RepositoryInterface() {
            @Override
            public void showError(Boolean show) {
                showFinishMessage.postValue(show);
            }

            @Override
            public void onLoading(boolean loading) {
                loadingLiveData.postValue(loading);
            }

            @Override
            public void onSuccess(ArrayList<PetsDTO> data) {
                allPetsLiveData.postValue(pets);
            }
        });
    }

}

This is my usecase that is responsible for loading the Retrofit JSON:

package com.example.menunavegacion.ui.fragments.usecase;

....

public class LoadJSONUseCase {

    @Inject
    RequestInterface requestInterface;

    public LoadJSONUseCase(){
        DaggerComponenTest.builder().build().inject(this);
    }

    public void loadJSON(RepositoryInterface repositoryInterface) {
        Call<JSONResponse> call = requestInterface.getJSON();
        repositoryInterface.onLoading(true);
        call.enqueue(new Callback<JSONResponse>() {
            @Override
            public void onResponse(Call<JSONResponse> call, Response<JSONResponse> response) {
                repositoryInterface.onLoading(false);
                JSONResponse jsonResponse = response.body();
                ArrayList<PetsDTO> data = new ArrayList<>();
                data.clear();
                data.addAll(jsonResponse.getPetsDTO());
                repositoryInterface.onSuccess(data);
            }

            @Override
            public void onFailure(Call<JSONResponse> call, Throwable t) {
               repositoryInterface.onLoading(false);
               repositoryInterface.showError(false);
            }
        });

    }
}

This would be all my code. I also accept advice about MVVM since I'm learning and well, they're welcome, so I'll stay with you. Thank you very much.

I know that in Windows in the debugger if I use the key Alt + Clickabove the element that I want to evaluate it does it without problem, but do you know if there is a way to change this shortcut? In Ubuntu it works with Ctrl + Alt + Shift + Clickand as you can imagine it is not at all comfortable compared to Windows, and also that I was already used to this shortcut, but I had to go to Ubuntu, and I am surprised that this option cannot be changed from the configuration.

I have an Adapter created and I want to populate two "different" RecyclerViews that share the same layout and class attributes. So I wanted to use the same adapter for both recyclerview since it seemed to me not very useful to create two different ones, I have done it in the following way:

This would be the code of my Adapter:

    class EducationAdapter : RecyclerView.Adapter<EducationViewHolder>() {

    var education: MutableList<Education> = ArrayList()
    lateinit var context: Context

    fun EducationAdapter(education: MutableList<Education>, context: Context){

        this.education = education
        this.context = context

    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): EducationViewHolder {
        val layoutInflater = LayoutInflater.from(parent.context)
        return EducationViewHolder(
            layoutInflater.inflate(
                R.layout.education_design,
                parent,
                false
            )
        )
    }

    override fun getItemCount(): Int {

        return education.size

    }

    override fun onBindViewHolder(holder: EducationViewHolder, position: Int) {

    val item = education.get(position)
        holder.bind(item)

    }


}

class EducationViewHolder(view: View) : RecyclerView.ViewHolder(view) {

    val educationUrl = view.findViewById(R.id.ivEducationImage) as ImageView
    val educationTitle = view.findViewById(R.id.tvEducationTitle) as TextView
    val educationPlace = view.findViewById(R.id.tvEducationPlace) as TextView
    val educationDesc = view.findViewById(R.id.tvEducationDescription) as TextView

    fun bind(education: Education){

        educationUrl.loadUrl(education.url)
        educationTitle.text = education.title
        educationPlace.text = education.place
        educationDesc.text = education.description

    }

    fun ImageView.loadUrl (url: String){

        Glide.with(context).load(url).transform(CenterCrop(), CircleCrop()).into(this)

    }

}

This would be the code of my class where I want the elements of the RecyclerView to be displayed:

class EducationFragment : Fragment() {

    lateinit var mRecyclerViewAcademic: RecyclerView
    lateinit var mRecyclerViewComplementary: RecyclerView
    val mAdapter: EducationAdapter = EducationAdapter()

    companion object {
        fun newInstance(): EducationFragment =
            EducationFragment()
    }

    fun setUpRecyclerView() {

        mRecyclerViewAcademic = rvEducationAcademic
        mRecyclerViewAcademic.setHasFixedSize(true)
        mRecyclerViewAcademic.layoutManager = LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false)
        mAdapter.EducationAdapter(getEducationAcademic(), requireContext())
        mRecyclerViewAcademic.adapter = mAdapter

        mRecyclerViewComplementary = rvEducationComplementary
        mRecyclerViewComplementary.setHasFixedSize(true)
        mRecyclerViewComplementary.layoutManager = LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false)
        mAdapter.EducationAdapter(getEducationComplementary(), requireContext())
        mRecyclerViewComplementary.adapter = mAdapter

    }

    fun getEducationAcademic(): MutableList<Education> {

        var educationAcademic: MutableList<Education> = ArrayList()

        educationAcademic.add(Education("https://einatec.com/wp-content/uploads/2019/03/errores-disenadores-graficos.jpg", "Prueba", "Prueba", "Prueba"))
        educationAcademic.add(Education("https://einatec.com/wp-content/uploads/2019/03/errores-disenadores-graficos.jpg", "Prueba", "Prueba", "Prueba"))

        return educationAcademic

    }

    fun getEducationComplementary(): MutableList<Education> {

        var educationComplementary: MutableList<Education> = ArrayList()

        educationComplementary.add(Education("https://cdn57.androidauthority.net/wp-content/uploads/2017/05/Android-Studio-Coding2-840x473.jpg", "Prueba", "Prueba", "Prueba"))

        return educationComplementary

    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? =
        inflater.inflate(R.layout.fragment_education, container, false)

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)

        setUpRecyclerView()

    }
}

In my head it looked good, but of course, I guess the problem is that I am using the same list for both recyclerview, but I have no idea how to specify a different list inside the adapter, it helps a beginner, thanks.

Good luck, let's see, I was looking at the Google Play console and it reported the following error from a tablet:

  Caused by: android.view.InflateException:

  at android.view.LayoutInflater.inflate (LayoutInflater.java:539)
  at android.view.LayoutInflater.inflate (LayoutInflater.java:423)
  at android.view.LayoutInflater.inflate (LayoutInflater.java:374)
  at android.support.v7.app.AppCompatDelegateImpl.setContentView (AppCompatDelegateImpl.java:469)
  at android.support.v7.app.AppCompatActivity.setContentView (AppCompatActivity.java:140)
  at com.isaac.tiquismiquis.MainActivity.onCreate (MainActivity.java:211)
  at android.app.Activity.performCreate (Activity.java:6284)
  at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1113)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2518)

Caused by: android.view.InflateException:

  at android.view.LayoutInflater.createViewFromTag (LayoutInflater.java:782)
  at android.view.LayoutInflater.createViewFromTag (LayoutInflater.java:704)
  at android.view.LayoutInflater.rInflate (LayoutInflater.java:835)
  at android.view.LayoutInflater.rInflateChildren (LayoutInflater.java:798)
  at android.view.LayoutInflater.rInflate (LayoutInflater.java:838)
  at android.view.LayoutInflater.rInflateChildren (LayoutInflater.java:798)
  at android.view.LayoutInflater.inflate (LayoutInflater.java:515)

Caused by: android.content.res.Resources$NotFoundException:

  at android.content.res.Resources.loadDrawableForCookie (Resources.java:2834)
  at android.content.res.Resources.loadDrawable (Resources.java:2756)
  at android.content.res.TypedArray.getDrawable (TypedArray.java:870)
  at android.widget.ImageView.<init> (ImageView.java:152)
  at android.widget.ImageView.<init> (ImageView.java:140)
  at android.support.v7.widget.AppCompatImageView.<init> (AppCompatImageView.java:72)
  at android.support.v7.widget.AppCompatImageView.<init> (AppCompatImageView.java:68)
  at android.support.v7.app.AppCompatViewInflater.createImageView (AppCompatViewInflater.java:182)
  at android.support.v7.app.AppCompatViewInflater.createView (AppCompatViewInflater.java:106)
  at android.support.v7.app.AppCompatDelegateImpl.createView (AppCompatDelegateImpl.java:1266)
  at android.support.v7.app.AppCompatDelegateImpl.onCreateView (AppCompatDelegateImpl.java:1316)
  at android.view.LayoutInflater.createViewFromTag (LayoutInflater.java:746)

Looking for information, I suspect that this error is due to the density of the tablet screen (it is 8 inches), since in the onCreate I have so that when you press a button and it edittextis empty, change the image to another, or it is directly that I have added the image in only one size, since I only added it in one of them "bareback" in the drawable.

I am also going to put the content of the onCreate of my MainActivity and the content of the XML, in case there is any error in it:

Here you have, on the one hand, the content of the XML:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background"
    tools:context=".MainActivity">

    <android.support.constraint.ConstraintLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <ImageView
            android:layout_width="350dp"
            android:layout_height="100dp"
            android:id="@+id/ivLogo"
            android:scaleType="centerCrop"
            android:src="@drawable/logotipo"
            android:layout_marginBottom="50dp"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/tvBeforeTranslate"/>

        <TextView
            android:id="@+id/tvBeforeTranslate"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/textNoTranslate"
            app:layout_constraintLeft_toLeftOf="parent"
            android:fontFamily="@font/truenosbd"
            android:textColor="#6D6D6D"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="@id/ivLogo" />

        <EditText
            android:id="@+id/etBeforeTranslate"
            android:layout_width="350dp"
            android:layout_height="200dp"
            android:layout_marginTop="30dp"
            android:gravity="start"
            android:paddingTop="10dp"
            android:paddingStart="10dp"
            android:textSize="16sp"
            android:fontFamily="@font/truenoultlt"
            app:layout_constraintLeft_toLeftOf="parent"
            android:background="#FFFFFF"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/tvBeforeTranslate" />

        <Button
            android:id="@+id/btnTranslate"
            android:layout_width="250dp"
            android:layout_height="80dp"
            android:layout_marginTop="30dp"
            android:textColor="#FFFFFF"
            android:fontFamily="@font/truenosbd"
            android:background="@color/buttons"
            android:text="Traducir"
            android:textAllCaps="false"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@id/btnVoice"
            app:layout_constraintTop_toBottomOf="@id/etBeforeTranslate" />

        <ImageButton
            android:id="@+id/btnVoice"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:layout_marginStart="20dp"
            android:layout_marginTop="30dp"
            android:background="@color/buttons"
            android:src="@drawable/ic_keyboard_voice"
            app:layout_constraintStart_toEndOf="@id/btnTranslate"
            app:layout_constraintTop_toBottomOf="@id/etBeforeTranslate" />


    </android.support.constraint.ConstraintLayout>


</android.support.constraint.ConstraintLayout>

And on the other hand I put the content of the onCreate:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.bind(this);

    btnVoice.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if (count == 0) {

                if (ContextCompat.checkSelfPermission(MainActivity.this,
                        Manifest.permission.RECORD_AUDIO)
                        != PackageManager.PERMISSION_GRANTED) {

                    checkPermission();

                } else {

                    speechToText();
                    btnVoice.setImageResource(R.drawable.ic_keyboard_voice_press);
                    etBeforeTranslate.setText("");
                    etBeforeTranslate.setHint("Venga anda, te escucho, mimimi...");
                }

                count = 1;

            } else if (count == 1) {

                mSpeechRecognizer.cancel();
                mSpeechRecognizer.destroy();
                btnVoice.setImageResource(R.drawable.ic_keyboard_voice);
                etBeforeTranslate.setHint("");
                count = 0;

            }
        }
    });

    btnTranslate.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String texto = textTranslate();

            if (etBeforeTranslate.getText().toString().trim().isEmpty()) {

                ivLogo.setImageResource(R.drawable.logotipoangry);
                Toast.makeText(MainActivity.this, "¡Ay que agobio! Intridici il tixti, anda", Toast.LENGTH_SHORT).show();

            } else {

                Translates = FirebaseDatabase.getInstance().getReference("Translates");
                registerTranslates();
                ivLogo.setImageResource(R.drawable.logotipo);
                Intent intent = new Intent(MainActivity.this, TranslateActivity.class);
                intent.putExtra("texto", texto);
                startActivity(intent);


            }

        }
    });

}

Let's see if you can give me a hand with this and if after all my suspicions were true, the truth is that in my short journey through the world of programming, I had never run my app other than on my mobile, but of course now that the I have uploaded to the store, I get other errors, although it is good for me to learn. Thank you very much.

Good folks, I have my following onDestroy() method:

@Override
protected void onDestroy() {
    super.onDestroy();
    mSpeechRecognizer.cancel();
    mSpeechRecognizer.destroy();
}

According to the Google console, it is causing a NPE sometimes, I have checked and yes. I think the reason is that sometimes I am destroying a process that has not started and I know that the solution is with an if, but I don't know how to tell it to destroy it when it has started.

You see, I have a button in my application so that what we want to say can be transcribed by voice. The problem is that I have created a counter on the button so that when I press the button again, it stops listening, but it doesn't work:

public class MainActivity extends AppCompatActivity {

private static final int MY_PERMISSIONS_RECORD_AUDIO = 1;
int count = 0;
SpeechRecognizer mSpeechRecognizer;
Intent mSpeechRecognizerIntent;
@BindView(R.id.etBeforeTranslate)
EditText etBeforeTranslate;
@BindView(R.id.ivLogo)
ImageView ivLogo;
@BindView(R.id.btnTranslate)
Button btnTranslate;
@BindView(R.id.btnVoice)
ImageButton btnVoice;

private DatabaseReference Translates;

public String removeAccents() {...}

public String textTranslate() {...}

public void registerTranslates() {...}

private void checkPermission() {

    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.RECORD_AUDIO)
            != PackageManager.PERMISSION_GRANTED) {

        //When permission is not granted by user, show them message why this permission is needed.
        if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                Manifest.permission.RECORD_AUDIO)) {
            //Give user option to still opt-in the permissions
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.RECORD_AUDIO},
                    MY_PERMISSIONS_RECORD_AUDIO);

        } else {
            // Show user dialog to grant permission to record audio
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.RECORD_AUDIO},
                    MY_PERMISSIONS_RECORD_AUDIO);
        }
    }
    //If permission is granted, then go ahead recording audio
    else if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.RECORD_AUDIO)
            == PackageManager.PERMISSION_GRANTED) {

        //Go ahead with recording audio now
        speechToText();
    }

}

private void speechToText() {

    mSpeechRecognizer = SpeechRecognizer.createSpeechRecognizer(this);
    mSpeechRecognizerIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
    mSpeechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
    mSpeechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());

    mSpeechRecognizer.setRecognitionListener(new RecognitionListener() {
        @Override
        public void onReadyForSpeech(Bundle params) {

        }

        @Override
        public void onBeginningOfSpeech() {

        }

        @Override
        public void onRmsChanged(float rmsdB) {

        }

        @Override
        public void onBufferReceived(byte[] buffer) {

        }

        @Override
        public void onEndOfSpeech() {

        }

        @Override
        public void onError(int error) {

        }

        @Override
        public void onResults(Bundle results) {
            ArrayList<String> matches = results.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);
            if (matches != null) {
                etBeforeTranslate.setText(matches.get(0));

            }
        }

        @Override
        public void onPartialResults(Bundle partialResults) {

        }

        @Override
        public void onEvent(int eventType, Bundle params) {

        }
    });

    mSpeechRecognizer.startListening(mSpeechRecognizerIntent);

    count = 1;

}

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_RECORD_AUDIO: {
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // permission was granted, yay!
                speechToText();
            } else {
                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                Toast.makeText(this, "Vaya, pues te quedas sin hablarme", Toast.LENGTH_LONG).show();
            }
            return;
        }
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.bind(this);

    btnVoice.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if (count == 0) {


                checkPermission();
                speechToText();
            }

            else if (count == 1) {

                mSpeechRecognizer.stopListening();
                etBeforeTranslate.setText("holi");
            }

        }
    });

    btnTranslate.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String texto = textTranslate();

            if (etBeforeTranslate.getText().toString().trim().isEmpty()) {

                ivLogo.setImageResource(R.drawable.logotipoangry);
                Toast.makeText(MainActivity.this, "¡Ay que agobio! Intridici il tixti, anda", Toast.LENGTH_SHORT).show();

            } else {

                Translates = FirebaseDatabase.getInstance().getReference("Translates");
                registerTranslates();
                ivLogo.setImageResource(R.drawable.logotipo);
                Intent intent = new Intent(MainActivity.this, TranslateActivity.class);
                intent.putExtra("texto", texto);
                startActivity(intent);


            }

        }
    });

}

}

The text that I entered was to verify that it showed it to me to see that it was being carried out and indeed it changes, it shows it to me, that is to say that it enters, but that it goes, I do not get the sound as if it has stopped listening and I don't know if It is a problem of my application or of third parties, since I read in answers from years ago that this service was not working well, but I suppose that over the years it has been solved. Let's see if you can give me a hand, thank you very much :)

You see, I have the following code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.bind(this);

    btnTranslate.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String texto = textTranslate();

            if (etBeforeTranslate.getText().toString().isEmpty()) {

                ivLogo.setImageResource(R.drawable.logotipoangry);
                Toast.makeText(MainActivity.this, "¡Ay que agobio! Intridici il tixti, anda", Toast.LENGTH_SHORT).show();

            } else {

                Translates = FirebaseDatabase.getInstance().getReference("Translates");
                registerTranslates();
                ivLogo.setImageResource(R.drawable.logotipo);
                Intent intent = new Intent(MainActivity.this, TranslateActivity.class);
                intent.putExtra("texto", texto);
                startActivity(intent);

            }

        }
    });

I have the problem in the conditional, that I verify that if the EditText is empty, I execute that code. The problem comes when I make a line break, although the line is empty, the application believes that there is text inserted, how can I tell it that even if the person presses enter without writing text, it is still empty and does not let him advance?

Goodnight everyone,

I have a button navigation view in my application that each button goes to a Fragment, except for the central button that I use to add and I want it to go to an Activity with a form, I have the following code:

package com.isaac.appet;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;

import com.isaac.appet.FinderFragment.FinderFragment;
import com.isaac.appet.HomeFragment.HomeFragment;
import com.isaac.appet.NotesFragment.NotesFragment;


public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        BottomNavigationView bottomNavigation = findViewById(R.id.bottomNavigation);
        bottomNavigation.setOnNavigationItemSelectedListener(navListener);

        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.fragment_container,new HomeFragment()).commit();

    }

    private BottomNavigationView.OnNavigationItemSelectedListener navListener = new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {

            Fragment selectedFragment = null;


            switch (menuItem.getItemId()) {

                case R.id.btnHome:

                    selectedFragment = new HomeFragment();
                    break;

                case R.id.btnFinder:

                    selectedFragment = new FinderFragment();
                    break;

                case R.id.btnNotes:

                    selectedFragment = new NotesFragment();
                    break;

                case R.id.btnAdd:

                    startActivity(new Intent(MainActivity.this, PetsFormActivity.class));
                    break;
            }

            getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, selectedFragment).commit();

            return true;
        }

    };

}

This is my attempt to make the central button go to the Activity, and in principle it does, but when I want to go back it gives me a Null Pointer, which I indicate below:

    2019-06-11 23:57:08.313 28899-28907/com.isaac.appet E/com.isaac.appe: Failed to send DDMS packet REAQ to debugger (-1 of 20): Broken pipe
2019-06-11 23:57:33.756 28899-28899/com.isaac.appet E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.isaac.appet, PID: 28899
    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
        at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:396)
        at android.support.v4.app.BackStackRecord.replace(BackStackRecord.java:444)
        at android.support.v4.app.BackStackRecord.replace(BackStackRecord.java:434)
        at com.isaac.appet.MainActivity$1.onNavigationItemSelected(MainActivity.java:63)
        at android.support.design.widget.BottomNavigationView$1.onMenuItemSelected(BottomNavigationView.java:204)
        at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:840)
        at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:158)
        at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:991)
        at android.support.design.internal.BottomNavigationMenuView$1.onClick(BottomNavigationMenuView.java:115)
        at android.view.View.performClick(View.java:6597)
        at android.view.View.performClickInternal(View.java:6574)
        at android.view.View.access$3100(View.java:778)
        at android.view.View$PerformClick.run(View.java:25889)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6746)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:495)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

When I give it, it tells me that the line that is wrong or gives a conflict is the one that makes the Fragment transaction after the switch, but I'll stay there, to see if you can give me a hand. Thanks.