CODEWITHSUNDEEP
androidflutter
Scott Kilbourn
Scott Kilbourn

Reputation: 1586

How do I keep screen on in Flutter using FLAG_KEEP_SCREEN_ON?

I've been trying to work out how to keep the screen on in an app I'm working on. There is a lot of information about this online, but I haven't really found anything flutter specific. I've found various post about using wakelocks but when I try that my app always ends up crashing on start. I'd prefer not to use wakelocks though.

The information that I find tells me to put the following into MainActivity.java.

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)

When I do this, the app won't compile because of errors with it.

package WindowManager does not exist getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); ^
1 error

FAILURE: Build failed with an exception.

This is the code that I have in MainActivity.java

import android.os.Bundle;
import io.flutter.app.FlutterActivity;
import io.flutter.plugins.GeneratedPluginRegistrant;

public class MainActivity extends FlutterActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  GeneratedPluginRegistrant.registerWith(this);
}

Is there any advice on what I'm missing?

Edit: I was able to get FLAG_KEEP_SCREEN_ON working. I needed to import android.view.WindowManager in MainActivity.java. This is what the code looks like now:

import android.os.Bundle;
import android.view.WindowManager; //Needed for not letting screen shut off.
import io.flutter.app.FlutterActivity;
import io.flutter.plugins.GeneratedPluginRegistrant;

public class MainActivity extends FlutterActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    GeneratedPluginRegistrant.registerWith(this);

    //Do not let screen shut off.
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  }
}

I tried using android:keepScreenOn="true", but could not work out where to put it in my files.

Upvotes: 2

Views: 2510

Answers (2)

Ali Ghahremani
Ali Ghahremani

Reputation: 1

You should add this in manifest.xml:

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

This permission will allow you to use wake lock api.

Upvotes: 0

Suman Kumar Dash
Suman Kumar Dash

Reputation: 704

I think you can use android:keepScreenOn="true". Please take a look at https://developer.android.com/training/scheduling/wakelock

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:keepScreenOn="true">
...

Upvotes: 1

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