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Accepted
Bernardo Harreguy
Asked: 2020-02-04 14:00:49 +0800 CST 2020-02-04 14:00:49 +0800 CST

Why does NetBeans not recognize getApplicationContext()?

  • 772

something very strange that happens to me, is that I try to place getApplicationContext() and it tells me that

"cannot find symbol"

I do the corresponding import and it does not give an error

import android.content.ContextWrapper;

For you to understand, the mediaplayer works for me, I can create an android mediaplayer, but I can't make that work, why? hope someone knows thanks

The source code where this problem occurs is the following package bfhsoftware.soundambiental;

import android.content.Context;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.widget.Toast;

/**
 *
 * @author bfhsoftware
 */
public class ReproductorAndroid extends reproductor{
    private static MediaPlayer reproductor = null;
    OnCompletionListener escuchar = sedetienelamusica();
    public ReproductorAndroid() {
        super();
    }

    @Override
    public void empezar(String proximotema) {        
        super.empezar(proximotema);
        //
        if ((reproductor == null)){
            try {
                if (proximotema.equals("")){                    
                    System.out.println(proximotema);
                    //Environment.getExternalStorageDirectory().getPath()+
                    //Uri myUri = Uri.parse(proximotema);
                    reproductor = new MediaPlayer();                 
                    reproductor.setDataSource(getApplicationContext(),Uri.parse(proximotema)); 

                    reproductor.prepare(); // might take long! (for buffering, etc)                                        
                    reproductor.setOnCompletionListener(escuchar);
                    reproductor.start();
                    System.out.println("deberia estar reproduciendo");
                }
            } catch(Exception e ) {
                e.printStackTrace();
                System.out.println("error al reproducir");
                System.out.println(e.getMessage());        
            }
        }
        reproduciendo = (reproductor != null);
    }

    @Override
    public void parar() {
        /* Llamamos a la implementación común de parada */
        super.parar();
        /* Implementamos aquí el método en android */
    }

    @Override
    public void pausa() {
        /* Llamamos a la implementación común de pausa */
        super.pausa();
        /* Implementamos aquí el método en android */
    }

    private OnCompletionListener sedetienelamusica() {
        reiniciar();
        reproducir();
        return null;
    }
    private void reiniciar(){
        reproduciendo = false;
        if (reproductor != null)
            reproductor.stop();
        reproductor = null;
    }
    public static void displayExceptionMessage(Context context, String msg)
{
    Toast.makeText(context, msg , Toast.LENGTH_LONG).show();
}
}

in the line player.setDataSource(getApplicationContext(),Uri.parse(nexttopic)); the compiler tells me that getApplicationContext is not recognized as a symbol, I have tried in netbeans and intellij idea community version. For me the code is correctly entered, for me the problem is the platform, it is not Android where I execute it, how to place this syntax and compile it, and that it only be executed if the operating system is not android?

java

2 Answers

  1. Best Answer

    Since you're not inheriting from ActionBarActivity you can't access the getActivityContext() method.

    One option you have is to pass to this class (via the constructor) the context of the activity at the time you create it. To do this, you will have to indicate that, in the constructor, you receive an object of type Context.

    In addition to this, you have to declare a Context object global to your class so that you can match it in the constructor so that you can use it in other methods of your class.

    It would be done as follows:

    import android.content.Context;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.widget.Toast;

/**
 *
 * @author bfhsoftware
 */
public class ReproductorAndroid extends reproductor{
private static MediaPlayer reproductor = null;
private static Context contexto;  //Declaramos un objeto tipo Context para almacenar el que nos van a pasar por el constructor
OnCompletionListener escuchar = sedetienelamusica();
public ReproductorAndroid(Context cont) {  //Indicamos que recibimos contexto
    super();
    contexto = cont;  //Ya tenemos el contexto para utilizarlo en esta clase
}

@Override
public void empezar(String proximotema) {        
    super.empezar(proximotema);
    //
    if ((reproductor == null)){
        try {
            if (proximotema.equals("")){    
...

    When creating an object you will have to do it as follows:

    ReproductorAndroid repro = new ReproductorAndroid(getActivityContext());
    • 11

  2. Why does NetBeans not recognize getApplicationContext()?

    Actually getApplicationContext() is an Android SDK method that returns the context of the single global Application object of the current process.

    This method could be used if Netbeans had the Android Plugin installed (as it was done in Eclipse), however these plugins are already obsolete and the official recommendation for Android development is Android Studio .

    What you really need is the context,

    What to do when your class doesn't extend Activity, AppCompatActivity, etc.?

    In this case the option is to send the context to instantiate the class, for this the constructor is modified:

    public class ReproductorAndroid extends reproductor{

    ...
    ...

    private Context context;

    public ReproductorAndroid(Context context) {
        this.context = context;
        super();
    }

    ...

    this way you can use the context using the variable context, now to instantiate the AndroidPlayer class (using getApplicationContext()is more "lightweight"):

    ReproductorAndroid repro = new ReproductorAndroid(getApplicationContext());
    • 2