为什么添加加速器后应用程序崩溃？

Question

I'm trying to create an app that play a certain audio file, that was previously recorded, when I press a button or shake my phone. Here is my code.

public class Reproduzir extends Activity implements SensorEventListener{
MediaPlayer player = new MediaPlayer();
SensorManager sensor;

@Override
protected void onCreate(Bundle savedInstanceState ){
    super.onCreate(savedInstanceState);

    sensor= (SensorManager) getSystemService(SENSOR_SERVICE);
    setContentView(R.layout.reproduzir);
    Button reproduzir = (Button) findViewById(R.id.reproduzir);
    reproduzir.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            play();

        }
    });
    Button fechar= (Button) findViewById(R.id.fechar);
    fechar.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            if (player.isPlaying()) {
                player.stop();
                player.release();
            }
            finish();


        }
    });

}
public void play(){
    try {
        player.setDataSource(Environment.getExternalStorageDirectory().getPath()+"/2cp.3gp");
        player.prepare();
        player.start();
    } catch (IllegalArgumentException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (SecurityException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IllegalStateException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


}
public void onStart(){
    super.onStart();
    sensor.registerListener(this,sensor.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
            SensorManager.SENSOR_DELAY_FASTEST);
}


@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // TODO Auto-generated method stub

}

@Override
public void onSensorChanged(SensorEvent event) {
    // TODO Auto-generated method stub
    if(event.values[0]>2.2||event.values[1]>2.2||event.values[2]>2.2){
        play();

    }
}

}

The app was working fine untill I added the last bit of code (the onSensorChanged method) and if I comment it the app runs fine. But when I run the code with that code I get the following error

02-14 17:59:15.425: E/MediaPlayer(12895): Unable to create media player
02-14 17:59:15.426: W/System.err(12895): java.io.IOException: setDataSourceFD failed.: status=0x80000000
02-14 17:59:15.426: W/System.err(12895):    at android.media.MediaPlayer._setDataSource(Native Method)
02-14 17:59:15.426: W/System.err(12895):    at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1035)
02-14 17:59:15.427: W/System.err(12895):    at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1019)
02-14 17:59:15.427: W/System.err(12895):    at android.media.MediaPlayer.setDataSource(MediaPlayer.java:998)
02-14 17:59:15.427: W/System.err(12895):    at android.media.MediaPlayer.setDataSource(MediaPlayer.java:954)
02-14 17:59:15.427: W/System.err(12895):    at com.example.segundocasopratico.Reproduzir.play(Reproduzir.java:54)
02-14 17:59:15.427: W/System.err(12895):    at com.example.segundocasopratico.Reproduzir.onSensorChanged(Reproduzir.java:90)
02-14 17:59:15.427: W/System.err(12895):    at android.hardware.SystemSensorManager$SensorEventQueue.dispatchSensorEvent(SystemSensorManager.java:505)
02-14 17:59:15.427: W/System.err(12895):    at android.os.MessageQueue.nativePollOnce(Native Method)
02-14 17:59:15.427: W/System.err(12895):    at android.os.MessageQueue.next(MessageQueue.java:138)
02-14 17:59:15.427: W/System.err(12895):    at android.os.Looper.loop(Looper.java:150)
02-14 17:59:15.427: W/System.err(12895):    at android.app.ActivityThread.main(ActivityThread.java:5327)
02-14 17:59:15.427: W/System.err(12895):    at java.lang.reflect.Method.invokeNative(Native Method)
02-14 17:59:15.427: W/System.err(12895):    at java.lang.reflect.Method.invoke(Method.java:515)
02-14 17:59:15.428: W/System.err(12895):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
02-14 17:59:15.428: W/System.err(12895):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
02-14 17:59:15.428: W/System.err(12895):    at dalvik.system.NativeStart.main(Native Method)

any thoughts on a reason for this?

EDIT Ok I managed to solve this. The problem was, I think, that the value for the acceleration was to small. I upped it to 10 and it's working. The problem now is that it only plays once... if I shake it again or press the button a second time it won't play.

Answer 1

I do not believe this has to do with your accelerometer.

0x80000000 means the file is corrupted, or incomplete.

See this: Exception when calling setDataSource(FileDescriptor) method (failed.: status=0x80000000)

Answer 2

This line is causing the Exception .

player.setDataSource(Environment.getExternalStorageDirectory().getPath()+"/2cp.3gp");

Make sure that your file is existing, is accessable and is not corrupted or damaged. If you are running on the emulator, sometimes when pushing files to the emulator it corrupts the files. Try it on your phone, if you can.