在您的帮助和互联网上的一些指南下，我设法敲掉了这段代码。但是我发现自己有几个问题，应用程序，根据我的想法，它应该在手机摇晃的时候启动媒体播放器，并启动一次，但现在每次手机摇晃都会启动媒体播放器。此外，我希望，当手机摇晃时，应用程序可以工作并且屏幕关闭，启动媒体播放器并打开屏幕
public class SensorTestActivity extends Activity implements SensorEventListener {
private SensorManager sensorManager;
private boolean color = false;
private View view;
private long lastUpdate;
MediaPlayer mMediaPlayer;
@Override
public void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
view = findViewById(R.id.textView);
view.setBackgroundColor(Color.BLUE);
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
sensorManager.registerListener(this,
sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_NORMAL);
lastUpdate = System.currentTimeMillis();
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
getAccelerometer(event);
}
}
private void getAccelerometer(SensorEvent event) {
float[] values = event.values;
// Movement
float x = values[0];
float y = values[1];
float z = values[2];
float accelationSquareRoot = (x * x + y * y + z * z)/(SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH);
long actualTime = System.currentTimeMillis();
if (accelationSquareRoot >= 2) //
{
if (actualTime - lastUpdate < 200) {
return;
}
lastUpdate = actualTime;
Toast.makeText(this, "Device was shuffed", Toast.LENGTH_SHORT).show();
if (color) {
view.setBackgroundColor(Color.GREEN);
try {
mMediaPlayer = MediaPlayer.create(getBaseContext(), R.raw.mymusic);
mMediaPlayer.setLooping(false);
mMediaPlayer.start();
mMediaPlayer.setOnCompletionListener(new
OnCompletionListener() {
public void onCompletion(MediaPlayer arg0) {
// if (mMediaPlayer != null) {
// mMediaPlayer.release();
// mMediaPlayer = null;
// }
}
});
} catch (Exception e) {
if (mMediaPlayer != null) {
mMediaPlayer.release();
mMediaPlayer = null;
}
}
}
} else {
view.setBackgroundColor(Color.RED);
}
color = !color;
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
@Override
protected void onResume() {
super.onResume();
// register this class as a listener for the orientation and
// accelerometer sensors
sensorManager.registerListener(this,
sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onPause() {
// unregister listener
super.onPause();
sensorManager.unregisterListener(this);
}
}