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UserNameYo
Asked: 2020-02-29 06:41:48 +0800 CST 2020-02-29 06:41:48 +0800 CST

Is it possible to change the background color of a "Floating" Activity?

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I need something like DialogFragmentbut with a full class, in other words create a activityfloat. The procedure is the next:

When I click MainActivityon an Item of my ListViewand it shows me a contextual menu , I select More Information and my class opens MasInformacionloading the data of my Sqliteof that Item , well, with this code I have managed to MasInformacionmake it float (perhaps it is not the best option , if there is a better one you can tell me please) and transparent so that it shows behind my MainActivity, like this:

Well, I want it to be like this:

Not be completely transparent, but have opacity to obscure the 'class' behind it.

MasInformacion: This is how I make it "Floating"

    DisplayMetrics flotante = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(flotante);

    int width = flotante.widthPixels;
    int height = flotante.heightPixels;

    getWindow().setLayout((int)(width*.9),(int)(height*.7));

...

// Recupero los datos de la DB

       extras = getIntent().getExtras();

        if (estadoEditarPersona()) {
            editTextNombre.setText(extras.getString("nombre"));
            editTextFecha.setText(extras.getString("fecha"));
            editTextZodiaco.setText(extras.getString("zodiaco"));
            editTextEdad.setText(extras.getString("edad"));
            editTextDiasrestantes.setText(extras.getString("diasrestantes"));
            ruta_imagen = extras.getString("ruta_imagen");
            imagenPersona.setImageBitmap(crearThumb());
        }
    }

MainActivity

// menu contextual

   @Override
    public boolean onContextItemSelected(android.view.MenuItem item) {
        AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();

        switch (item.getItemId()) {
            case R.id.menu_contextual_mas_informacion:
                masInformacion((int)info.id);
                return true;
            default:
                return super.onContextItemSelected((android.view.MenuItem) item);
        }
    }

...

// metodo masInformacion

    public void masInformacion(int p_id){
            Persona persona;
            try{
                persona = baseDatos.getPersona(p_id);
                // Se dirige a la actividad MasInformacion
                Intent actividad_editarPersona = new Intent(this, MasInformacion.class);

                // Carga los datos para mostrar en MasInformacion
                actividad_editarPersona.putExtra("id", p_id);
                actividad_editarPersona.putExtra("nombre", persona.getNombre());
                actividad_editarPersona.putExtra("fecha", persona.getFecha());
                actividad_editarPersona.putExtra("zodiaco", persona.getZodiaco());
                actividad_editarPersona.putExtra("edad", persona.getEdad());
                actividad_editarPersona.putExtra("diasrestantes", persona.getDiasrestantes());
                actividad_editarPersona.putExtra("ruta_imagen", persona.getRutaImagen());
                startActivityForResult(actividad_editarPersona, CODIGO_RESULT_EDITAR_PERSONA);
            }catch (Exception e){
                Toast.makeText(getApplicationContext(), (getResources().getString(R.string.error_mostrarinformacion)), Toast.LENGTH_SHORT).show();
                e.printStackTrace();
            }finally{
                baseDatos.cerrar();
            }
        }

style.xmlI load it from AndroidManifestwithandroid:theme="@style/AppTheme.Flotante"/>

    <style name="AppTheme.Flotante">

        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowCloseOnTouchOutside">true</item>
        <item name="android:windowBackground">@drawable/borde_flotante</item>
    </style>

   <!-- probe así pero lo transparente se vuelve completamente negro, cuando "colorPrimary" no es negro-->

    <style name="AppTheme.Flotante">
        <item name="android:windowBackground">@color/colorPrimary</item>
    </style>
java

2 Answers

  1. You can see the documentation here: https://developer.android.com/reference/android/app/DialogFragment.html

    Inside the onClick() of your item call this method:

    showDialog();

    FromGoogle docs:

    void showDialog() {
        // DialogFragment.show() will take care of adding the fragment
        // in a transaction.  We also want to remove any currently showing
        // dialog, so make our own transaction and take care of that here.
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        Fragment prev = fm.findFragmentByTag("dialog");
        if (prev != null) {
            ft.remove(prev);
        }
        ft.addToBackStack(null);

        // Create and show the dialog.
        DialogFragment newFragment = MyDialogFragment.newInstance();
        newFragment.show(ft, "tag");
    }

    And here the custom DialogFragment:

    public class MyDialogFragment extends DialogFragment {

    static MyDialogFragment newInstance() {
        return new MyDialogFragment();
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.custom_layout, container, false);
        return view;
    }
}

    With this you will show the content of the layout (in this case custom_layout.xml) in a floating window with background with the default transparency.

    If you want to send information to this fragment do it in the following way.

    FromGoogle docs:

    static MyDialogFragment newInstance(int num) {
    MyDialogFragment f = new MyDialogFragment();

    // Supply num input as an argument.
    Bundle args = new Bundle();
    args.putInt("num", num);
    f.setArguments(args);

    return f;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mNum = getArguments().getInt("num");
}

    I have tested the code, it works and does what you ask.

    If you want to transform the Activity you have to the DialogFragment, use the same layout, pass the content of your Activity's onCreate to the fragment's onCreateView and copy all the methods and variables.

    • 2
  2. Best Answer

    As an example if you want a "transparent" background color, containing a , define it in colors.xml:

    <color name="transparent">#00000000</color>

    and you call it from the defined style:

    <style name="AppTheme.Flotante">
    <item name="android:windowBackground">@color/transparent</item>
</style>

    Remember that you can define another type of opacity, for example a green color:

    #00FF00

    To this color you can define opacity, or without opacity:

    #0000FF00

    or completely opaque:

    #FF00FF00
    • 2