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;