让android程序根据重力感应旋转屏幕(支持4个方向旋转)

最新推荐文章于 2021-06-02 16:14:18 发布

windyyi

最新推荐文章于 2021-06-02 16:14:18 发布

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ChangeOrientationHandler.java

public class ChangeOrientationHandler extends Handler {
    private Activity activity;
  public ChangeOrientationHandler(Activity ac) { super();  activity = ac;  } @Override  public void handleMessage(Message msg) { if (msg.what == 888) { int orientation = msg.arg1;  if (orientation > 45 && orientation < 135) { activity.setRequestedOrientation(SCREEN_ORIENTATION_REVERSE_LANDSCAPE); // Log.d(MainActivity.TAG, "横屏翻转: ");  } else if (orientation > 135 && orientation < 225) { activity.setRequestedOrientation(SCREEN_ORIENTATION_REVERSE_PORTRAIT); // Log.d(MainActivity.TAG, "竖屏翻转: ");  } else if (orientation > 225 && orientation < 315) { activity.setRequestedOrientation(SCREEN_ORIENTATION_LANDSCAPE); // Log.d(MainActivity.TAG, "横屏: ");  } else if ((orientation > 315 && orientation < 360) || (orientation > 0 && orientation < 45)) { activity.setRequestedOrientation(SCREEN_ORIENTATION_PORTRAIT); // Log.d(MainActivity.TAG, "竖屏: ");  } } super.handleMessage(msg);  } }

OrientationSensorListener.java

public class OrientationSensorListener implements SensorEventListener {
    private static final int _DATA_X = 0;  private static final int _DATA_Y = 1;  private static final int _DATA_Z = 2;   public static final int ORIENTATION_UNKNOWN = -1;   private Handler rotateHandler;    public OrientationSensorListener(Handler handler) { rotateHandler = handler;  } public void onAccuracyChanged(Sensor arg0, int arg1) { // TODO Auto-generated method stub   } public void onSensorChanged(SensorEvent event) { float[] values = event.values;  int orientation = ORIENTATION_UNKNOWN;  float X = -values[_DATA_X];  float Y = -values[_DATA_Y];  float Z = -values[_DATA_Z];  float magnitude = X * X + Y * Y;  // Don't trust the angle if the magnitude is small compared to the y value  if (magnitude * 4 >= Z * Z) { float OneEightyOverPi = 57.29577957855f;  float angle = (float) Math.atan2(-Y, X) * OneEightyOverPi;  orientation = 90 - (int) Math.round(angle);  // normalize to 0 - 359 range  while (orientation >= 360) { orientation -= 360;  } while (orientation < 0) { orientation += 360;  } } if (rotateHandler != null) { rotateHandler.obtainMessage(888, orientation, 0).sendToTarget();  } } }

MainActivity.java

public class MainActivity extends AppCompatActivity {
public static final String TAG = "MainActivity";
 private Button button;

 private Handler handler;
 private OrientationSensorListener listener;
 private SensorManager sm;
 private Sensor sensor;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 handler = new ChangeOrientationHandler(this);

 sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
 sensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
 listener = new OrientationSensorListener(handler);
 sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);

 button = (Button) findViewById(R.id.button);
 button.setOnClickListener(new View.OnClickListener() {

public void onClick(View view) {
 Log.d(TAG, "onClick: " + getResources().getConfiguration().orientation);
 }
 });
 }

@Override
 protected void onPause() {
sm.unregisterListener(listener);
 super.onPause();
 }

@Override
 protected void onResume() {
sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);
 super.onResume();
 }