How can I make android mediaplayer play sound?

问题

I don't know why it doesn't works, there is no error logged in logcat, but I cannot hear a sound.

public static void DeclararSonido(int numero, Context contexto){
    switch(numero){
    case 0:
        mp = MediaPlayer.create(contexto, R.raw.alan);
        break;          
    }
}

public static void TocarPiedra( int posicion, Context contexto){
    DeclararSonido(posicion, contexto);


    mp.start();
    mp.stop();
    mp.release();
}
public static void TocarSirena(Context contexto){
    MediaPlayer mp2= MediaPlayer.create(contexto, R.raw.doh);


    mp2.start();
    mp2.stop();
    mp2.release();

}

If I erase mp2.stop(); and mp2.release(); AND mp.stop(); and mp.release(); the app plays the sound, but the file is not released...

回答1:

You certainly do not want to Start and then Stop right away..

The problem is that you are executing these right after each other:

mp.start();      // starts playback
mp.stop();       // .. then stops immediately ..
mp.release();

You should call start, and then when the sound is done playing, release. You can use the Completion event to hook up a listener and release there:

mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener(){
    public void onCompletion(MediaPlayer player) {
       player.release();          
    }
})

回答2:

Mediaplayer.create():- creates the new object of mediaplayer .this object is having music file from raw folder which is to be played when start() method is called

Mediaplayer.start():- *starts playing music* if object Mediaplayer is initialized .otherwise gives exception.

Mediaplayer.stop() :-*stops* the current ongoing music with that object.

Mediaplayer.release():-the music file path is no longer associated with Mediaplayer object. so u need to reallocate memory and all. mind it mediaplayer would not be null .

go here and see the state diagram of mediaplayer

Now what you are doing is that starting the song and directly stopping it .I would suggest you to create button , and when button is pressed stop the mediaplayer.

Other way is already given by Miky Dinescu that setoncompletelistner.

so, do as follows

public static void DeclararSonido(int numero, Context contexto){
    switch(numero){
    case 0:
        mp = MediaPlayer.create(contexto, R.raw.alan);
        break;          
    }
}

public static void TocarPiedra( int posicion, Context contexto){
    DeclararSonido(posicion, contexto);


    mp.start();
    mp.setOnCompleteListener(new OnCompleteListener(){
    public void OnCompletion(MediaPlayer mp){
    mp.stop();
    mp.release();
    }});
}
public static void TocarSirena(Context contexto){
    MediaPlayer mp2= MediaPlayer.create(contexto, R.raw.doh);

    //Alomejor es por la extension

    mp2.start();
    mp2.setOnCompleteListener(new OnCompleteListener(){
    public void OnCompletion(MediaPlayer mp){
    mp2.stop();
    mp2.release();
    }});


}

来源：https://stackoverflow.com/questions/16280751/how-can-i-make-android-mediaplayer-play-sound

标签

java

android

media-player