Java 安卓应用

Question

我需要您尽快帮助。 我需要创建一个 java android 应用程序，它会在摇动手机时打开音乐。 所以在初始位置声音被关闭，当摇动它时，它开始播放。 但是当停止摇动它时，声音就会关闭。 .mp3 文件已在项目中。我怎么了？

package com.authorwjf;
public class Main extends Activity implements SensorEventListener {
private float mLastX, mLastY, mLastZ;
private boolean mInitialized;
private SensorManager mSensorManager;
private Sensor mAccelerometer;
private final float NOISE = (float) 2.0;

//music

MediaPlayer logoMusic;
boolean paused = true;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //music

    logoMusic =  MediaPlayer.create(Main.this, R.raw.music);
    logoMusic.setVolume(0, 1);
    //

    //
    setContentView(R.layout.main);
    mInitialized = false;
    mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    mSensorManager.registerListener(this, mAccelerometer , SensorManager.SENSOR_DELAY_NORMAL);
}

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // can be safely ignored for this demo
}

@Override
public void onSensorChanged(SensorEvent event) {
    TextView tvX= (TextView)findViewById(R.id.x_axis);
    TextView tvY= (TextView)findViewById(R.id.y_axis);
    TextView tvZ= (TextView)findViewById(R.id.z_axis);
    ImageView iv = (ImageView)findViewById(R.id.image);
    float x = event.values[0];
    float y = event.values[1];
    float z = event.values[2];
    if (!mInitialized) {
        mLastX = x;
        mLastY = y;
        mLastZ = z;
        tvX.setText("0.0");
        tvY.setText("0.0");
        tvZ.setText("0.0");
        mInitialized = true;


    } else {

        float deltaX = Math.abs(mLastX - x);
        float deltaY = Math.abs(mLastY - y);
        float deltaZ = Math.abs(mLastZ - z);
        if (deltaX < NOISE) deltaX = (float)0.0;
        if (deltaY < NOISE) deltaY = (float)0.0;
        if (deltaZ < NOISE) deltaZ = (float)0.0;
        mLastX = x;
        mLastY = y;
        mLastZ = z;
        tvX.setText(Float.toString(deltaX));
        tvY.setText(Float.toString(deltaY));
        tvZ.setText(Float.toString(deltaZ));
        iv.setVisibility(View.VISIBLE);
        if (deltaX > deltaY) {
            iv.setImageResource(R.drawable.horizontal);
        } else if (deltaY > deltaX) {
            iv.setImageResource(R.drawable.vertical);
        } else {
            iv.setVisibility(View.INVISIBLE);
        }

        logoMusic.start();

    }
}
public void pauseMusic( View v ) {
      if (paused)
      {
          logoMusic.start();
          paused = true;
      }
      else
      {
          logoMusic.pause();
          paused = false;
      }
  }


 protected void onResume() {
        super.onResume();
        mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);

          logoMusic.start();
    }

    protected void onPause() {

        mSensorManager.unregisterListener(this);

        super.onPause();
          logoMusic.pause();
    }

Answer 1

您定义了媒体播放器，但从未启动它。开始它：

logoMusic.start();