What is the best way to import multiple classes from the same package. The easiest is to import the entire package, although classes that are not needed can be imported here.
import mipaquete.foo.*
The other way is longer but it would only matter what you need:
import mipaquete.foo.Clase1
import mipaquete.foo.Clase2
// Otras clases importadas aquí.
import mipaquete.foo.Clase5
Does it affect performance when the entire package is imported with classes that are not used?
I am trying to connect through the console to the phone where I have my application installed so that I can query the database with SQL.
I was watching a tutorial in the show how it is done, however it did not work for me, I looked for extra information and found another example that does the same thing, so I tried again if I did something wrong, but the same error appears.
The steps are the following:
<sdk>/platform-tools/adb shellsqlite3 data/data/<package>/databases/<nombre-base-de-datos>After this the following message should appear:
SQLite version 3.8.10.2 2015-05-20 18:17:19
Enter ".help" for usage hints.
sqlite>
When performing step 3 I get the error sqlite3: not found
The only thing that I have noticed that is different is that after step 2 in the tutorials the console prompt is # , root@android:/ #while in mine it is $ , HWANE:/ $, I don't know if that has something to do with it.
When I try to run my application it appears Error running 'app': Default Activity not found, however my AndroidManifestx.ml I think is fine since it has not given me any problems before and I have not made changes to this file, I just suddenly got the error.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="io.github.ziceck.appgaci001">
<!-- To auto-complete the email text field in the login form with the user's emails -->
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<application
android:name=".Initializer"
android:allowBackup="true"
android:icon="@mipmap/logo"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:hardwareAccelerated="false"
android:largeHeap="true">
<activity android:name=".activities.HomeActivity">
</activity>
<activity android:name=".activities.LoginActivity"
android:noHistory="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".activities.ProyectoActivity" />
<activity android:name=".activities.ProjectsActivity" />
<activity android:name=".activities.ParticipantsActivity" />
<activity android:name=".activities.ActivitiesActivity" />
<activity android:name=".activities.RepliesActivity" />
</application>
</manifest>
I also already tried the option File -> Invalidate Cache / Restart, but the error persists.
I also tried to do it from Run/Debug Configurations con Specified Activitybut it says that the activity is not declared in the manifest, in fact it doesn't recognize any activity.
build.gradle (Module: app)
apply plugin: 'com.android.application'
android {
compileSdkVersion 27
defaultConfig {
applicationId "io.github.ziceck.appgaci001"
minSdkVersion 19
targetSdkVersion 27
versionCode 1
versionName "2018.12.05"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.android.volley:volley:1.1.0'
implementation 'com.android.support:cardview-v7:27.1.1'
implementation 'net.gotev:uploadservice:3.4.2'
implementation 'com.github.chrisbanes:PhotoView:2.1.3'
implementation 'de.hdodenhof:circleimageview:2.2.0'
}
build.gradle(Prohe)
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.2.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
mavenCentral()
maven { url "https://jitpack.io" }
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
I have an app and I am using Log.d(tag, mensaje);it to print messages and to be able to identify where my code fails.
The issue is that when I already have many Logs (especially if they are inside a loop) and I add new ones, the new ones no longer appear in the logcat.
To solve the aforementioned, what I have done is remove all the logs that I no longer need and leave only the new ones.
I get an empty array when I put the following:
document.getElementsByTagName("input");
However if I select an element with the inspect option and then put document.getElementsByTagName("input");it back this time it no longer returns an empty array, this time it does contain all the inputs that are part of the page.
How can I use document.getElementsByTagName("input");it and make it work without using the inspect option?
This does not happen to me on all pages, only on some.
I have a code to make a sum in assembler and it works fine, but I don't understand why it is necessary to make an adjustment to the characters, I have only been able to observe that if I don't make the adjustment when printing the result, a character is displayed that does not correspond to a number.
When I read a character I subtract 30H.
;read number1
MOV AH, 01H
INT 21H
;adjustment
SUB AL, 30H
MOV number1, AL
After doing the sum, add 30H.
ADD AL, number1
;Adjustment
ADD AL, 30H
MOV result, AL
In the case of variable names with a single word, it is normal to write them in the following way:
int entero;
double doble;
String cadena;
But for the case of variables that use two words, how should they be written? I have only used two forms:
Option 1:
int numero_entero;
double numero_doble;
Option 2:
int numeroEntero;
double numeroDoble;
I have also noticed that some variables that the Java libraries have are written in uppercase and separated by _ :
Foo.ANCHURA_MAXIMA;
Foo.ANCHURA_MINIMA;
So far I have only been able to comment as follows:
# Mi Comentario 1
# Mi Comentario 2
# Mi Comentario 3
But I would like to know something equivalent to /**/:
/*
Comentario 1
Comentario 2
Comentario 3
*/
I have the following code to recognize voice in Spanish, the problem is that there are several words which it does not recognize correctly.
using System;
using System.Speech.Recognition;
namespace SpeechRecognitionApp
{
class Program
{
static void Main(string[] args)
{
using (
SpeechRecognitionEngine recognizer =
new SpeechRecognitionEngine(
new System.Globalization.CultureInfo("es-ES")))
{
recognizer.LoadGrammar(new DictationGrammar());
recognizer.SpeechRecognized +=
new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
recognizer.SetInputToDefaultAudioDevice();
recognizer.RecognizeAsync(RecognizeMode.Multiple);
while (true)
{
Console.ReadLine();
}
}
}
static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
Console.WriteLine("Recognized text: " + e.Result.Text);
}
}
}
I have also tried to define the words that it can recognize, in this way it is never wrong, the drawback is that the number of words that it recognizes is limited to the number of words that I define.
Choices colors = new Choices();
colors.Add(new string[] { "azul", "rojo", "verde" });
// Create a GrammarBuilder object and append the Choices object.
GrammarBuilder gb = new GrammarBuilder();
gb.Append(colors);
// Create the Grammar instance and load it into the speech recognition engine.
Grammar g = new Grammar(gb);
// Create and load a dictation grammar.
recognizer.LoadGrammar(g);
Is there a way to recognize multiple words without getting it wrong and without being limited by the defined words?
I have seen a method that is written as follows.
public void metodox(int ... args) {
}
I tried passing parameters to it and it accepts N number of parameters.
metodox(1,2,3,4);
metodox(1,2);
I have a button and I want the gallery to open when I click it, so far I have only loaded other activities in the following way:
Intent i = new Intent(this, MainSignUp.class );
startActivity(i);
But it is of classes that I have in my project.
I have the following lines:
valor1=cadena.split("|")[0];
valor2=cadena.split("|")[1] ;
However, I am getting null, which means I am not getting any value when doing the split.
I have tried the same but with comma :
valor1=cadena.split(",")[0];
valor2=cadena.split(",")[1] ;
And this does work.
For example if I use:
printf("ó á");
The result obtained in the console is:
¾ ß
Where 3/4 represents ó and ß represents á
What I am referring to is whether there is a limit to the number of characters a URL can contain, and what the value of that limit would be if there is.
There is a main that is like this.
int main(int argc, char *argv[]){
}
And another one that is just like this:
int main(){
}
So far I have used both and both have worked for me, so I have not identified what the difference is between using one or the other, or if they have different purposes.
I have a file with the extension A.cpp which has templates that I would like to use in the B.cpp file . I tried putting the following in B.cpp :
#include "A.cpp"
But I get the following error:
C:\Users\friky\Documents\Octavo Semestre\Inteligencia Artificial\Arbol.cpp In function 'int main(int, char**)':
3 5 C:\Users\friky\Documents\Octavo Semestre\Inteligencia Artificial\Arbol.cpp [Error] redefinition of 'int main(int, char**)'
1 0 C:\Users\friky\Documents\Octavo Semestre\Inteligencia Artificial\Arbol.cpp In file included from C:\Users\friky\Documents\Octavo Semestre\Inteligencia Artificial\Arbol.cpp
286 5 C:\Users\friky\Documents\Octavo Semestre\Inteligencia Artificial\arbolABB-templ.cpp [Error] 'int main(int, char**)' previously defined here
I'm using Bash on Linux and found an example where I compared strings this way but it doesn't seem to work.
In this case, $ait is what the user types into the console.
#!/bin/bash
a=$1
if [ "${a}"=="static" ]; then
(instrucciones)
else
(instrucciones)
fi
So far I only know that it is an interface that has the following methods:
invokeMethod()
invokeFunction()
getInterface()
But I don't understand what each of them is for and where exactly the Invocable interface is used.
Many times the variables of a class in java are declared as private to have encapsulation.
Other issues to declare a variable as private is so that it can only be accessible from the same class, but finally in most cases you end up doing set and get methods to modify the variable or to get it outside the class.
So what I'm wondering is if there's any good reason to declare a private variable and put a set and a get instead of declaring it public and avoid a set and a get .
For example, if I have a video file and I change the mp4 extension to txt, its internal structure is still that of a video. But how could it detect that it is still a video if the extension has been changed. I have done some research and I know that each extension has certain bytes or a certain structure that identifies them but I don't know how to use that to verify what my question says.