Programmatically turn screen on in android
Solution 1
I started off much like you, and the window flags didn't really work.
I finally got it to work by using two Android services: KEYGUARD_SERVICE
and POWER_SERVICE
:
KeyguardManager km = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
final KeyguardManager.KeyguardLock kl = km.newKeyguardLock("MyKeyguardLock");
kl.disableKeyguard();
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP
| PowerManager.ON_AFTER_RELEASE, "MyWakeLock");
wakeLock.acquire();
Don't forget to release the wake lock when you're done with it.
You'll need to request permissions DISABLE_KEYGUARD
and WAKE_LOCK
Solution 2
Here is the solution
WindowManager windowManager = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT,
LayoutParams.TYPE_SYSTEM_ALERT |
LayoutParams.TYPE_SYSTEM_OVERLAY,
LayoutParams.FLAG_NOT_TOUCH_MODAL |
LayoutParams.FLAG_SHOW_WHEN_LOCKED |
LayoutParams.FLAG_KEEP_SCREEN_ON|
LayoutParams.FLAG_DISMISS_KEYGUARD|
LayoutParams.FLAG_TURN_SCREEN_ON,
PixelFormat.TRANSPARENT);
KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
km.isKeyguardLocked();
windowManager.addView(mTopView, params);
getWindow().setBackgroundDrawable();
Solution 3
I also suffered from many problems for my app. Actually i want screen lock when user presses the back button twice. and unlock when user presses the home button.
For unlock the device marmor's code is right. :) I've used this code.
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
WakeLock wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK
| PowerManager.ACQUIRE_CAUSES_WAKEUP
| PowerManager.ON_AFTER_RELEASE, "MyWakeLock");
wakeLock.acquire();
user1177122
Updated on March 09, 2020Comments
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user1177122 about 4 years
I am developing an alarm application. From the main activity i set the alarm using broadcast. Then in onReceive in broadcast receiver i call activity that is enabling user to shut down or snooze the alarm...In that activity, in the beginning of onCreate i use this lines to turn screen on and unlock the device:
final Window win = getWindow(); win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD); win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
This works perfect on Samsung Galaxy S2 with android 2.3.4 but doesnt work on htc with android 2.3.5. On htc it does nothing, and when i press lock button screen automatically unlocks without me draging the circle. Its like flag_dissmiss_keygard is working but flag_turn_screen_on isnt. Is there another way or another solution for doing this?
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nifo over 11 yearsI tried it on Nexus One (2.3.6) and Nexus S (4.1.1) and it works pretty well.
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Patrick Horn over 11 yearsDevelopers, I beg you: please don't do this!!! Just want to put out a warning that disabling keyguard does what it says: it bypasses any PIN or Pattern unlock. Try a long-press of home (gingerbread) or app switch button (ICS) and you will see what I mean. I have had no issues using layout params on the most popular phones, and the number of Gingerbread phones is going down daily. Please reconsider window flags!
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marmor over 11 yearsHey @PatrickHorn can you specify an example of a device in which this bypasses the PIN lock screen. In my tests I can display a screen to the user with the message I want, and the second the user tries to hit home or switch app, he gets the enter PIN screen. So it seemed safe enough to me.
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ChuongPham over 10 yearsIn situation where the user has created a secured lock for their device (i.e. by using a PIN, password, etc), I would be wary of using the
KeyguardLock#disableKeyguard()
part of the answer above as this would "seem" to bypass the screen lock on their device. Also, theWindowManager#LayoutParams()
method is a hit-and-run in that it doesn't always work even though Google framework developers thought so and have commented as such on other posts here in SO. -
Manza over 8 yearsIn my device this solution only turn on the screen BUT do not unlock android. Do I need to add somethin?
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Kishan B Manavadariya over 8 years@Manza Use the code from below answer given by the marmor. That will unlock the device too.
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android developer over 7 yearsDoes this require any permission?
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koteswarao over 7 yearsSorry for delay, i have given the permission in AndroidManifest.xml <uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
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Alexey Ozerov over 3 yearsWhat is mTopView and what does the call to km.isKeyguardLocked() ?
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Devin Carpenter over 2 yearsUnfortunately FULL_WAKE_LOCK is now deprecated