Wake Android Device up | 易学教程

问题

Hey i need to wake my sleeping android device up at a certain time. Any suggestions?

P.S. Wake up: turn display on and maybe unlock phone

回答1:

Best is to use some appropriate combination of these window flags:

http://developer.android.com/reference/android/view/WindowManager.LayoutParams.html#FLAG_DISMISS_KEYGUARD
http://developer.android.com/reference/android/view/WindowManager.LayoutParams.html#FLAG_SHOW_WHEN_LOCKED
http://developer.android.com/reference/android/view/WindowManager.LayoutParams.html#FLAG_KEEP_SCREEN_ON
http://developer.android.com/reference/android/view/WindowManager.LayoutParams.html#FLAG_TURN_SCREEN_ON

If you want to run on older versions of the platform that don't support the desired flag(s), you can directly use wake locks and keyguard locks... but that path is fraught with peril.

ONE IMPORTANT NOTE: Your activity must be full screen in order for the above flag combination to work. In my app I tried to use these flags with an activity which is not full screen (Dialog Theme) and it didn't work. After looking at the documentation I found that these flags require the window to be a full screen window.

回答2:

To wake up the screen:

PowerManager pm = (PowerManager) getApplicationContext().getSystemService(Context.POWER_SERVICE);
WakeLock wakeLock = pm.newWakeLock((PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP), "TAG");
wakeLock.acquire();

To release the screen lock:

KeyguardManager keyguardManager = (KeyguardManager) getApplicationContext().getSystemService(Context.KEYGUARD_SERVICE); 
KeyguardLock keyguardLock = keyguardManager.newKeyguardLock("TAG");
keyguardLock.disableKeyguard();

And the manifest needs to contain:

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

For more details about PowerManager, refer to the API documentation: http://developer.android.com/reference/android/os/PowerManager.html

EDIT: this answer is reported as deprecated.

回答3:

I found a way and it is not that complex... works on any API version.

You need to use PowerManager.userActivity(l, false) method and register your activity as broadcast received for SCREEN_OFF intent:

In your actiivity OnCreate put something like:

mReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.v(TAG, "Screen OFF onReceive()");
        screenOFFHandler.sendEmptyMessageDelayed(0, 2000L);
    }
};

It will kick off the handler after 2 seconds of Screen Off event.

IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
registerReceiver(mReceiver, filter);
Log.i(TAG, "broadcast receiver registered!");

Create a handler like the one below:

private Handler screenOFFHandler = new Handler() {

    @Override
    public void handleMessage(Message msg) {

        super.handleMessage(msg);
        // do something
        // wake up phone
        Log.i(TAG, "ake up the phone and disable keyguard");
        PowerManager powerManager = (PowerManager) YourActivityName.this
                .getSystemService(Context.POWER_SERVICE);
        long l = SystemClock.uptimeMillis();
        powerManager.userActivity(l, false);//false will bring the screen back as bright as it was, true - will dim it
    }
};

Request permission in your manifest file:

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

Do not forget to unregister broadcast receiver when you are done. You may do that in onDestroy() for example (which is not guaranteed)

unregisterReceiver(mReceiver);
Log.i(TAG, "broadcast UNregistred!");

回答4:

If you are showing a window when waking up, you can get it working easily by adding few flags to your activity, without using a wake lock.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.my_activity);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
}

回答5:

On newer devices you should use something like this, since the mentioned Flags are deprecated.

class AlarmActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_alarm)

        // Keep screen always on, unless the user interacts (wakes the mess up...)
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)

        setTurnScreenOn(true)
        setShowWhenLocked(true)

        (getSystemService(KeyguardManager::class.java) as KeyguardManager).requestDismissKeyguard(this,
            object: KeyguardManager.KeyguardDismissCallback(){
                override fun onDismissCancelled() {
                    Log.d("Keyguard", "Cancelled")
                }

                override fun onDismissError() {
                    Log.d("Keyguard", "Error")
                }

                override fun onDismissSucceeded() {
                    Log.d("Keyguard", "Success")
                }
            }
        )
    }
}

KeyguardManager.requestDismissKeyguard only wakes up the device, if the setter setTurnScreenOn(true) was called before.

I tested this on my Android Pie device.

回答6:

Settling an alarm programatically will wake up the phone(play a sound) and i guess the turn on display would be an option there.

I donot think there would be an exposed API that will unlock the phone automatically.

回答7:

getWindow().addFlags(LayoutParams.FLAG_DISMISS_KEYGUARD);

will dismiss the general keyguard and cause the device to unlock.

来源：https://stackoverflow.com/questions/3621599/wake-android-device-up

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android

wakeup