Question

现在我正试图让手机旋转。我设法编写代码，这样做，但不幸的是它只在按钮点击时给出了值。每次值更改时，如何更新TextView？换句话说 - 这有什么EventListener吗？如果是，如何实施呢？

public class MainActivity extends Activity {

SensorManager _sensorManager;

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

    SensorManager sensorManager = (SensorManager) this.getSystemService(SENSOR_SERVICE);        

    final float[] mValuesMagnet      = new float[3];
    final float[] mValuesAccel       = new float[3];
    final float[] mValuesOrientation = new float[3];
    final float[] mRotationMatrix    = new float[9];

    final Button btn_valider = (Button) findViewById(R.id.btn1);
    final TextView txt1 = (TextView) findViewById(R.id.textView1);
    final SensorEventListener mEventListener = new SensorEventListener() {
        public void onAccuracyChanged(Sensor sensor, int accuracy) {
        }

        public void onSensorChanged(SensorEvent event) {
            // Handle the events for which we registered
            switch (event.sensor.getType()) {
                case Sensor.TYPE_ACCELEROMETER:
                    System.arraycopy(event.values, 0, mValuesAccel, 0, 3);
                    break;

                case Sensor.TYPE_MAGNETIC_FIELD:
                    System.arraycopy(event.values, 0, mValuesMagnet, 0, 3);
                    break;
            }
        };
    };

    // You have set the event lisetner up, now just need to register this with the
    // sensor manager along with the sensor wanted.
    setListners(sensorManager, mEventListener);

    btn_valider.setOnClickListener(new View.OnClickListener()
    {
        public void onClick(View view)
        {
            SensorManager.getRotationMatrix(mRotationMatrix, null, mValuesAccel, mValuesMagnet);
            SensorManager.getOrientation(mRotationMatrix, mValuesOrientation);
            final CharSequence test;
            float XAxis = (float) (mValuesOrientation[0] * 180/Math.PI);
            float YAxis = (float) (mValuesOrientation[1] * 180/Math.PI);
            float ZAxis = (float) (mValuesOrientation[2] * 180/Math.PI);
            test = "results: " + XAxis +" "+ YAxis+ " "+ ZAxis;
            txt1.setText(test);
        }
    });

}

// Register the event listener and sensor type.
public void setListners(SensorManager sensorManager, SensorEventListener mEventListener)
{
    sensorManager.registerListener(mEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), 
            SensorManager.SENSOR_DELAY_NORMAL);
        sensorManager.registerListener(mEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD), 
                SensorManager.SENSOR_DELAY_NORMAL);

    }
}

Answer 1

使用单独的方法移动方向计算部分：

private void calculateOrientation(){
      SensorManager.getRotationMatrix(mRotationMatrix, null, mValuesAccel, mValuesMagnet);
      SensorManager.getOrientation(mRotationMatrix, mValuesOrientation);
      final CharSequence test;
      float XAxis = (float) (mValuesOrientation[0] * 180/Math.PI);
      float YAxis = (float) (mValuesOrientation[1] * 180/Math.PI);
      float ZAxis = (float) (mValuesOrientation[2] * 180/Math.PI);
      test = "results: " + XAxis +" "+ YAxis+ " "+ ZAxis;
      txt1.setText(test);
}

请注意，您已经通过调用＆＃34; txt1.setText（test）;＆＃34;来更新TextView的值。计算方向后。因此，现在您必须确保每次更改传感器数据时都调用此方向计算方法。

那么，只需从onSensorChanges（）方法中调用此方法：

public void onSensorChanged(SensorEvent event) {
      // Handle the events for which we registered
      switch (event.sensor.getType()) {
         case Sensor.TYPE_ACCELEROMETER:
            System.arraycopy(event.values, 0, mValuesAccel, 0, 3);
            break;

         case Sensor.TYPE_MAGNETIC_FIELD:
             System.arraycopy(event.values, 0, mValuesMagnet, 0, 3);
             break;
      }

      //Call the orientation calculation method
      calculateOrientation();
 };

每次有新的传感器数据时，都应该更新TextView。

获得电话角度

1 个答案: