带有媒体播放器的应用程序无法正常运行

Question

case R.id.btn7:
    if (mp != null && mp.isPlaying()) mp.stop();
    mp = MediaPlayer.create(a.this, R.raw.aaaa);
    mp.start();
    break;
case R.id.btn8:
    if (mp != null && mp.isPlaying()) mp.stop();
    mp = MediaPlayer.create(a.this, R.raw.bbbb);
    mp.start();
    break;

How could I use setDataSource in order to stop my app for force close? Please help! If I use it like this, eclipse highlights red the setDataSource;

public void onClick(View v) {
    switch(v.getId()) {
        case R.id.btn:
            if (mp != null && mp.isPlaying()) mp.stop();
            mp.setDataSource(zoo.this,R.raw.gata);
            mp.prepare();
            mp.start();
            break;

Answer 1

Okay, so I've actually been working on something similar for a hobby project I've been working on. After reading through the MediaPlayer documentation for a while, here is the method I've come up with (note that this is with the intention of having only a single sound playing at one time):

First, I created an overridden Application class to hold my global variables -- in this instance, my single MediaPlayer object:

public class GlobalVars extends Application {
    private static MediaPlayer mp = new MediaPlayer();

    public static MediaPlayer getMediaPlayer() {
        return mp;
    }
}

This creates one instance of a MediaPlayer once the application begins. It's also static, so it's available without having to instantiate the class.

Now, in my main class (particularly in my onClick method), I retrieve this instance, reset it, set my data source, prepare it for play, and then start it:

MediaPlayer mp = GlobalVars.getMediaPlayer();

//note that in my case, item is an object of mine that 
//contains an AssetFileDescriptor, which you can get by
//calling getAssets().openFd("filename.mp3");
AssetFileDescriptor afd = item.getDescriptor();

mp.reset();
//leaving out the try/catch block for conciseness
mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
mp.prepare();
mp.start();

Answer 2

you can use sound manager if you finite no. of sounds to play. http://developer.android.com/reference/android/media/AudioManager.html