Question

我正在创建一个名为CompassApp的应用程序。我创建了两个名为Compass.java和Rose.java的类。此应用程序是根据网站中描述的教程创建的，它使用不推荐使用的SensorListener版本。 Compass.java类使用的是不推荐使用的版本。当我使用已弃用的版本时，应用程序运行正常。然后我想将我的应用程序转换为当前版本的SensorEventListener。但罗盘的旋转停止了！我被困住了，不知道该怎么办。请帮帮我。

Compass.java，不推荐使用SensorListener接口

  public class Compass extends Activity implements SensorListener {
  SensorManager sensorManager;
  static final int sensor = SensorManager.SENSOR_ORIENTATION;
  MyRose rose;

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

    // Set full screen view
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);
    requestWindowFeature(Window.FEATURE_NO_TITLE);

    rose = new MyRose(this);

    setContentView(rose);

    // get sensor manager
    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
  }

  // register to listen to sensors
  @Override
  public void onResume() {
    super.onResume();
    sensorManager.registerListener(this, sensor);
  }

  // unregister
  @Override
  public void onPause() {
    super.onPause();
    sensorManager.unregisterListener(this);
  }

  // Ignore for now
  public void onAccuracyChanged(int sensor, int accuracy) {
  }

  // Listen to sensor and provide output
  public void onSensorChanged(int sensor, float[] values) {
    if (sensor != Compass.sensor)
      return;
    int orientation = (int) values[0];
    rose.setDirection(orientation);
  }
 }

Compass.java与新的SensorEventListener

     public class Compass extends Activity{
          SensorManager sensorManager;
          SensorEventListener    listener ;

          static final int sensor = SensorManager.SENSOR_ORIENTATION;
          Rose rose;

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

           // Set full screen view
           getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
           WindowManager.LayoutParams.FLAG_FULLSCREEN);
           requestWindowFeature(Window.FEATURE_NO_TITLE);

           listener = new SensorEventListener()
           {
              @Override
          public void onSensorChanged(SensorEvent e)
          {   
              int orientation = (int) e.values[0];
              rose.setDirection(orientation);
          } 

          @Override
          public void onAccuracyChanged(Sensor arg0, int arg1) {
      // TODO Auto-generated method stub

       }
        };


        setContentView(rose);

       // get sensor manager
       sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
       sensorManager.registerListener(listener,       sensorManager.getDefaultSensor(sensor),SensorManager.SENSOR_MAGNETIC_FIELD);

      }

       // register to listen to sensors
       @Override
      public void onResume() {
      super.onResume();
      sensorManager.registerListener(listener, sensorManager.getDefaultSensor(sensor), SensorManager.SENSOR_MAGNETIC_FIELD);
      }

       // unregister
       @Override
       public void onPause() {
       super.onPause();
       sensorManager.unregisterListener(listener);
       }
     }

Answer 1

我认为这就是你所需要的。

public class Compass extends Activity implements SensorEventListener {
  SensorManager sensorManager;
  static final int sensor = SensorManager.SENSOR_ORIENTATION;
  MyRose rose;
  private Sensor myCompassSensor;

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

    // Set full screen view
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);
    requestWindowFeature(Window.FEATURE_NO_TITLE);

    rose = new MyRose(this);

    setContentView(rose);

    // get sensor manager
    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    // get compass sensor (ie magnetic field)
    myCompassSensor = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
  }

  // register to listen to sensors
  @Override
  public void onResume() {
    super.onResume();
    sensorManager.registerListener(this, myCompassSensor, SensorManager.SENSOR_DELAY_NORMAL);
  }

  // unregister
  @Override
  public void onPause() {
    super.onPause();
    sensorManager.unregisterListener(this);
  }

  // Ignore for now
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
      // TODO Auto-generated method stub
  }

  public void onSensorChanged(SensorEvent event) {
      // this check is unnecessary with only one registered sensor
      // but it's useful to know in case you need to add more sensors
      if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
          int orientation = (int) event.values[0];
          rose.setDirection(orientation);
      }
  }
}

编辑：添加检查以确定传感器类型

如何将使用SensorListener的程序转换为SensorEventListener

1 个答案: