Develop Reference

Android 13 Wake up Screen programmatically

Here is code working on Android 9. But on Android 13 (Samsung Galaxy) it doesn't work.
// Unlock screen & wake up phone
if ( deviceManger.isAdminActive( compName )) {
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();
}
Do you have any hints what should be modified for Android 13.
Thank you
I have tried but it also doesn't work
Window window = this.getWindow();
window.addFlags(LayoutParams.FLAG_DISMISS_KEYGUARD);
window.addFlags(LayoutParams.FLAG_SHOW_WHEN_LOCKED);
window.addFlags(LayoutParams.FLAG_TURN_SCREEN_ON);

After use PowerManager my device never goes to sleep mode anymore

I´m doing an app and I´m testing it on devices Samsung galaxy Y (Android 2.3.6) and Engel tablet 7" (Android 4.0.x).
In my app´s code I´m using this snippet in order to wake up the devices(when they are in sleep mode) and works well , but now my problem is that after wake up they never go to sleep mode anymore, only they go if I press the hardware button.
Anyone know how I can set the default energy settings after use PowerManager ?.
KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
final KeyguardManager.KeyguardLock kl = km .newKeyguardLock("MyKeyguardLock");
kl.disableKeyguard();
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();

Try this:
void wakeUpGirls() {
if (wakeLock != null) {
wakeLock.release();
}
KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
KeyguardLock keyguardLock = km.newKeyguardLock("TAG");
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
keyguardLock.disableKeyguard();
PowerManager pm = (PowerManager)getSystemService(Context.POWER_SERVICE);
wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK
| PowerManager.ACQUIRE_CAUSES_WAKEUP
| PowerManager.ON_AFTER_RELEASE
| PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "MyWakeLock");
wakeLock.acquire();
}
void sleepGirls() {
if (wakeLock != null) {
wakeLock.release();
wakeLock = null;
}
}

Use this one it works for me
PowerManager powermanager= ((PowerManager)getSystemService(Context.POWER_SERVICE));
WakeLock wakeLock = powermanager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "tag");
wakeLock.acquire(9000);
wakeLock.release
KeyguardManager km =(KeyguardManager)getSystemService(KEYGUARD_SERVICE);
k1 = km.newKeyguardLock("IN");
k1.disableKeyguard();

How to find the screen is locked in android

For my application, I need to know that the screen is locked. How to check this is problematically. I used following flag:
if(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON != 0){
// some code
}else if((WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED)!= 0){
// some code
}
But this always executing both if and else part... which flag I have to use to check the screen is locked or not?

I'll try to answer this though the question is already old since it is unresolved and could help other googlers. ;)
First you must register a BroadcastReceiver for Intent.ACTION_SCREEN_OFF & Intent.ACTION_SCREEN_ON. Note that this receiver must be registered in codes and will not work when declared in the manifest.
In your broadcast receiver, when you receive Intent.ACTION_SCREEN_ON, you can check if the screen is locked by using the below codes:
KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
boolean locked = km.inKeyguardRestrictedInputMode();

KeyguardManager myKeyManager = (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
if( myKeyManager.inKeyguardRestrictedInputMode()) {
//screen is locked
} else {
//screen is not locked
}

Register a broadcast receiver with action android.intent.action.ACTION_SCREEN_OFF and write your code in onReceive() method of receiver.
If you are using an activity, onPause() will be called when the screen locked and onResume() will be called when the screen unlocked.
In your code you are checking some flags, i don't know where you will do that checking ? is it continuous verification ? If you are using an activity in your app, the above procedure will happen, just check it in Android Developers website.

I guess you may have already found the answer, but if not (and for other developers), you can do it like this:
PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
boolean isScreenOn = powerManager.isScreenOn();
if (!isScreenOn) {
//Screen is in OFF State
//Code to power on and release lock
KeyguardManager km = (KeyguardManager) this
.getSystemService(Context.KEYGUARD_SERVICE);
final KeyguardManager.KeyguardLock kl = km
.newKeyguardLock("MyKeyguardLock");
kl.disableKeyguard();
PowerManager pm = (PowerManager) this
.getSystemService(Context.POWER_SERVICE);
WakeLock wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK
| PowerManager.ACQUIRE_CAUSES_WAKEUP
| PowerManager.ON_AFTER_RELEASE, "MyWakeLock");
wakeLock.acquire();
}

There are broadcasted intents for screen lock & unlock.
Check it like :
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)){//LOGIC Here}
Let me know!

Here is what I did:
This handles if the user has unlocked the screen, but not yet entered the home screen or the user's screen is turned off say during a call.
if (Intent.ACTION_SCREEN_ON.equals(pIntent.getAction()) ||
Intent.ACTION_USER_PRESENT.equals(pIntent.getAction())) {
if(mListener!=null) {
KeyguardManager km = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
boolean locked = km.inKeyguardRestrictedInputMode();
Log.v(TAG, ": Phone lock state from KEYGUARD_SERVICE: Current state:" + (locked ? "LOCKED":"UNLOCKED"));
mIsPhoneLocked = locked;
}
}

Android Trun on backlight

I need to turn on screen back-light and keyboard backlight when my application receive notification. I have tried with PowerManager It it wasn't successful.
Is there any way to turn on screen and keyboard backlights?
Thank You.

I have solved this issue.
private void backlightON(Context context){
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "MessageReader");
wakeLock.acquire();
}

Turning on screen programmatically

I would like to unlock screen and switching it on to show a popup on an event trigger. I am able to unlock the screen using
newKeyguardLock = km.newKeyguardLock(HANDSFREE);
newKeyguardLock.disableKeyguard();
on KeyGuardService but I cannot turn on the screen. I am using
wl = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, HANDSFREE);
wl.acquire();
but with no success. The screen still remains off.
How can I achieve this?

Note from author: I wrote this back in 2012. I don't know if it works anymore. Be sure to check out the other more recent answers.
Amir's answer got me close, but you need the ACQUIRE_CAUSES_WAKEUP flag at least (Building against Android 2.3.3).
WakeLock screenLock = ((PowerManager)getSystemService(POWER_SERVICE)).newWakeLock(
PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "TAG");
screenLock.acquire();
//later
screenLock.release();

This is very popular question but the accepted answer now is outdated.
Below is latest way to Turn On Screen OR wake up your device screen from an activity:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
this.setTurnScreenOn(true);
} else {
final Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
}
Use WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON but FLAG_TURN_SCREEN_ON flag has been deprecated in API level 27 so you can use Activity.setTurnScreenOn(true) from API level 27 onward.

In your main activity's OnCreate() write following code:
((PowerManager)getSystemService(POWER_SERVICE)).newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "TAG").acquire();
It causes the device to wake up.
Do not forget disableKeyguard() to unlock the device...

undefined's answer with NullPointer check and set timeout :
private void turnOnScreen() {
PowerManager.WakeLock screenLock = null;
if ((getSystemService(POWER_SERVICE)) != null) {
screenLock = ((PowerManager)getSystemService(POWER_SERVICE)).newWakeLock(
PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "TAG");
screenLock.acquire(10*60*1000L /*10 minutes*/);
screenLock.release();
}
}

This is how you can do it:
PowerManager powerManager = (PowerManager) context.getSystemService(context.POWER_SERVICE);
PowerManager.WakeLock wakeLock = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK |
PowerManager.ACQUIRE_CAUSES_WAKEUP |
PowerManager.ON_AFTER_RELEASE, "appname::WakeLock");
//acquire will turn on the display
wakeLock.acquire();
make sure to set permission in the manifest :
<uses-permission android:name="android.permission.WAKE_LOCK"/>