安卓接近传感器答案

【问题标题】：Android proximity sensor安卓接近传感器
【发布时间】：2022-10-09 01:51:38
【问题描述】：

几年（和几个 API）前，我做了一个应用程序，当盖子/盖子关闭时关闭屏幕（但应用程序没有进入睡眠状态）。我正在尝试再做一次，但我不记得我是否使用了接近传感器或唤醒锁。我一直在尝试使用下面的代码。如果我将手指放在传感器上，它会触发“onSensorChanged”事件，但如果我只是关闭传感器上的盖子/盖子，则不会。有什么好主意吗？

public class MainActivity extends AppCompatActivity implements SensorEventListener {
    private  SensorManager mSensorManager;
    private  Sensor mProximity;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
        mProximity = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
    }
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
    }
    public void onSensorChanged(SensorEvent event) {
        Toast.makeText(this,"Sensor change detected", Toast.LENGTH_SHORT).show();
    }
    protected void onResume() {
        super.onResume();
        mSensorManager.registerListener(this, mProximity, SensorManager.SENSOR_DELAY_NORMAL);
    }
    protected void onPause() {
        super.onPause();
        mSensorManager.unregisterListener(this);
    }
}

【问题讨论】：

标签： android sensors proximity

【解决方案1】：

您需要 PROXIMITY_SCREEN_OFF_WAKE_LOCK

public class MainActivity extends AppCompatActivity implements SensorEventListener {
                private  SensorManager mSensorManager;
                private  Sensor mProximity;
        PowerManager powerManager;
            PowerManager.WakeLock wakeLock;
                @Override
                protected void onCreate(Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);
                    setContentView(R.layout.activity_main);
                    Toolbar toolbar = findViewById(R.id.toolbar);
                    setSupportActionBar(toolbar);
                    mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
                    mProximity = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
        powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
               wakeLock = powerManager.newWakeLock(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK, "aodplus:pocket_mode");
                }
                public void onAccuracyChanged(Sensor sensor, int accuracy) {
                }
                public void onSensorChanged(SensorEvent event) {
    if (sensorEvent.sensor.getType() == Sensor.TYPE_PROXIMITY) {
     boolean isNear = event.values[0] < mProximity.getMaximumRange();
                if(isNear){
                 // near
                   turnOffScreen();
                }
    else {
                 // far
                   turnOnScreen();
                }
            }
                    Toast.makeText(this,"Sensor change detected", Toast.LENGTH_SHORT).show();
                }
                protected void onResume() {
                    super.onResume();
                    mSensorManager.registerListener(this, mProximity, SensorManager.SENSOR_DELAY_NORMAL);
                }
                protected void onPause() {
                    super.onPause();
                    mSensorManager.unregisterListener(this);
                }
        public void turnOnScreen(){
        
                if(wakeLock.isHeld()) wakeLock.release();
            }
        
            @TargetApi(21) //Suppress lint error for PROXIMITY_SCREEN_OFF_WAKE_LOCK
            public void turnOffScreen(){
              wakeLock.acquire( /*10 minutes*/);
        
            }
            }

【讨论】：