Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

Turn off screen on Android

I am trying to turn on and off the display after a certain action happens (Lets just worry about turning the screen off for now). From what I understand from wake lock, this is what I have:

PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);    
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "My Tag");

When I read other posts on stackoverflow and else where, they seem to tell me that PARTIAL_WAKE_LOCK will turn the screen off. But if I read the SDK it says that it will only allow the screen to be turned off. I think this isn't right.

like image 265
thegreyspot Avatar asked Jul 20 '11 03:07

thegreyspot


People also ask

How do I get my phone screen to turn off?

Open Settings. Tap Display. Tap Sleep or Screen timeout. Select how long you want your Android smartphone or tablet screen to stay on before turning off due to inactivity.

How do I make my phone screen turn off when not in use?

Navigate to Settings and then search for and select Screen timeout. Tap Screen timeout again. Choose the desired time limit for your screen to stay on.

Why is my phone screen not turning off?

First, open the Settings app on your phone. Second, click Display & Brightness. Then, select Screen timeout. And finally, adjust your screen timeout to 30 seconds (or 15 seconds.)


4 Answers

There are two choices for turning the screen off:

PowerManager manager = (PowerManager) getSystemService(Context.POWER_SERVICE);

// Choice 1
manager.goToSleep(int amountOfTime);

// Choice 2
PowerManager.WakeLock wl = manager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "Your Tag");
wl.acquire();
wl.release();

You will probably need this permission too:

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

UPDATE:

Try this method; android turns off the screen once the light level is low enough.

WindowManager.LayoutParams params = getWindow().getAttributes();
params.flags |= LayoutParams.FLAG_KEEP_SCREEN_ON;
params.screenBrightness = 0;
getWindow().setAttributes(params);
like image 108
A. Abiri Avatar answered Sep 29 '22 08:09

A. Abiri


The following is copied from SDK document. If you want to keep screen on, I think SCREEN_BRIGHT_WAKE_LOCK is enough.


Flag Value                CPU   Screen  Keyboard

PARTIAL_WAKE_LOCK          On*    Off      Off

SCREEN_DIM_WAKE_LOCK       On     Dim      Off

SCREEN_BRIGHT_WAKE_LOCK    On     Bright   Off

FULL_WAKE_LOCK             On     Bright   Bright

like image 24
jiangyan.lily Avatar answered Sep 29 '22 10:09

jiangyan.lily


For me those methods didn't work. So I used other scenario (not trivial) to make my screen off.

Android has 2 flags that responsible to be awake:

  • Display --> Screen TimeOut
  • Application --> Development --> Stay awake while charging check box.

I used followed flow:

  1. 1st of all save your previous configuration, for example screen timeout was 1 min and Stay awake while charging checked.

  2. After, I uncheck Stay awake while charging and set screen timeout to minimal time.

  3. I register to broadcast receiver service to get event from android that screen turned off.

  4. When I got event on screen off, I set previous configuration to default: screen timeout was 1 min and Stay awake while charging checked.

  5. Unregister receiver

After 15 sec. device sleeps

Here is snippets of code:

BroadcastReceiver

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

/**
 * Catch Screen On/Off
 * */
public class BroadcastReceiverScreenListener extends BroadcastReceiver{

private BroadCastListenerCallBackItf mBroadCastListenerCallBack = null;

public BroadcastReceiverScreenListener(
        BroadCastListenerCallBackItf broadCastListenerCallBack) {
    this.mBroadCastListenerCallBack = broadCastListenerCallBack;
}

@Override
public void onReceive(Context arg0, Intent intent) {


    if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
        mBroadCastListenerCallBack.broadCastListenerCallBack__ScreenOff_onResponse();
    }       
}

}

Interface used as callback

public interface BroadCastListenerCallBackItf {
    public void broadCastListenerCallBack__ScreenOff_onResponse();
}

2 methods from main class:

....

AndroidSynchronize mSync = new AndroidSynchronize();

....

public void turnScreenOff(int wait){
    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);

    BroadCastListenerCallBackItf broadCastListenerCallBack = this;

    BroadcastReceiver mReceiver = new BroadcastReceiverScreenListener(broadCastListenerCallBack);       
    m_context.registerReceiver(mReceiver, filter);



    //set Development --> disable STAY_ON_WHILE_PLUGGED_IN
    Settings.System.putInt(
            m_context.getContentResolver(), 
            Settings.System.STAY_ON_WHILE_PLUGGED_IN,
            0                                );



    // take current screen off time 
    int defTimeOut = Settings.System.getInt(m_context.getContentResolver(), 
            Settings.System.SCREEN_OFF_TIMEOUT, 3000);
    // set 15 sec
    Settings.System.putInt(m_context.getContentResolver(), 
            Settings.System.SCREEN_OFF_TIMEOUT, 15000);

    // wait 200 sec till get response from BroadcastReceiver on Screen Off
    mSync.doWait(wait*1000);


    // set previous settings
    Settings.System.putInt(m_context.getContentResolver(), 
            Settings.System.SCREEN_OFF_TIMEOUT, defTimeOut);

    // switch back previous state
    Settings.System.putInt(
            m_context.getContentResolver(), 
            Settings.System.STAY_ON_WHILE_PLUGGED_IN,
            BatteryManager.BATTERY_PLUGGED_USB);


    m_context.unregisterReceiver(mReceiver);


}





public void broadCastListenerCallBack__ScreenOff_onResponse() {
    mSync.doNotify();
}

....

AndroidSynchronize class

public class AndroidSynchronize {

    public void doWait(long l){
        synchronized(this){
            try {
                this.wait(l);
            } catch(InterruptedException e) {
            }
        }
    }       

    public void doNotify() {
        synchronized(this) {
            this.notify();
        }
    }   

    public void doWait() {
        synchronized(this){
            try {
                this.wait();
            } catch(InterruptedException e) {
            }
        }
    }
}

[EDIT]

You need to register permission:

android.permission.WRITE_SETTINGS
like image 39
Maxim Shoustin Avatar answered Sep 29 '22 10:09

Maxim Shoustin


Per this link, You can also turn the screen off like this:

Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_OFF_TIMEOUT, 1000);

1000 is in milliseconds which means 1 second, you can replace it with any value as desired.

Needed permission:

<uses-permission android:name="android.permission.WRITE_SETTINGS" />
like image 34
Kristy Welsh Avatar answered Sep 29 '22 08:09

Kristy Welsh