android 使用距离传感器实现贴近息屏离开亮屏

注册权限

要控制屏幕息屏需要用到WakeLock，所以需要在Manifest里注册

<uses-permission android:name="android.permission.WAKE_LOCK" />

代码实现

• 注册传感器

  SensorManager  sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE)
  
  mSensor = sensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
  
  //息屏设置
  PowerManager mPowerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
  mWakeLock = mPowerManager.newWakeLock(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK,
               TAG);
  

• 注册传感器监听

   @Override
    protected void onResume() {
        super.onResume();
        //注册传感器,先判断有没有传感器
        if (mSensor != null)
            sensorManager.registerListener(this, mSensor, SensorManager.SENSOR_DELAY_NORMAL);
    }
  

• 传感器变化监听

  /**
     * 传感器变化
     *
     * @param event
     */
    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.values[0] == 0.0) {
               //贴近手机
               //设置免提
               audioManager.setSpeakerphoneOn(false);
               audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
               //关闭屏幕
               if (!mWakeLock.isHeld())
                   mWakeLock.acquire();
  
           } else {
               //离开手机
               audioManager.setMode(AudioManager.MODE_NORMAL);
               //设置免提
               audioManager.setSpeakerphoneOn(true);
  
               //唤醒设备
               if (mWakeLock.isHeld())
                   mWakeLock.release();
           }
       }
  

• 关闭页面时释放

  //传感器取消监听
  sensorManager.unregisterListener(this);
   //释放息屏
    if (mWakeLock.isHeld())
        mWakeLock.release();
    mWakeLock = null;
    mPowerManager = null;