Question

在我的项目中，我需要使用接近传感器来管理屏幕灯。

从最近3天开始，我正在尝试做同样的事情。但我仍然没有成功。

我的半码工作正常。能够使用接近传感器关闭屏幕灯。但屏幕灯没亮。当我用手盖住传感器时，屏幕灯会亮起。但是在将手从传感器上移开后，光线没有亮起。

我的代码是：

@Override
public void onSensorChanged(SensorEvent event)
{
    if(event.sensor.getType() == Sensor.TYPE_PROXIMITY)
    {
        switch (lastSensorPosition)
        {
        //case 1 will turn on screen light
        case 1:
            lastSensorPosition = 2;
            WindowManager.LayoutParams lp = getWindow().getAttributes();
            lp.screenBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_FULL;
            getWindow().setAttributes(lp);
            break;



        //case 2 will turn off screen light
        case 2:
            lastSensorPosition = 1;
            WindowManager.LayoutParams lp1 = getWindow().getAttributes();
            lp1.screenBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_OFF;
            getWindow().setAttributes(lp1);
            break;

        default:
            break;
        }
    }
}

我期待你们的帮助......

Answer 1

private SensorManager mSensorManager;
private Sensor mSensor;
...
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);   


 public class SensorActivity extends Activity implements SensorEventListener {
      private SensorManager mSensorManager;
      private Sensor mProximity;

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

        // Get an instance of the sensor service, and use that to get an instance of
        // a particular sensor.
        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        mProximity = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
      }

      @Override
      public final void onAccuracyChanged(Sensor sensor, int accuracy) {
        // Do something here if sensor accuracy changes.
      }

      @Override
      public final void onSensorChanged(SensorEvent event) {
        float distance = event.values[0];
        // Do something with this sensor data.
      }

      @Override
      protected void onResume() {
        // Register a listener for the sensor.
        super.onResume();
        mSensorManager.registerListener(this, mProximity, SensorManager.SENSOR_DELAY_NORMAL);
      }

      @Override
      protected void onPause() {
        // Be sure to unregister the sensor when the activity pauses.
        super.onPause();
        mSensorManager.unregisterListener(this);
      }
    }

Answer 2

某些接近传感器返回表示“近”或“远”的二进制值。在这种情况下，传感器通常在远状态报告其最大范围值，在近状态报告较小值。通常，远值是>＆gt;的值。 5厘米，但这可能因传感器而异。您可以使用getMaximumRange（）方法确定传感器的最大范围。

如何使用接近传感器来管理屏幕灯：Android

2 个答案: