CODEWITHSUNDEEP
androidbrightnessscreen-brightness
Sayem
Sayem

Reputation: 86

Brightness goes normal after changing activity

I was trying to switch between 'full brightness' and 'phones normal brightness' by using a switch button in my main activity. I successfully handled the switching of brightness by using this code: 

switchButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean bChecked) {
            if (bChecked) {
                getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
                WindowManager.LayoutParams params = getWindow().getAttributes();
                params.screenBrightness = 1.0f;
                getWindow().setAttributes(params);
            } else {
                getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
                WindowManager.LayoutParams params = getWindow().getAttributes();
                params.screenBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE;
                getWindow().setAttributes(params);
            }
        }
    });

    if (switchButton.isChecked()) {
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        WindowManager.LayoutParams params = getWindow().getAttributes();
        params.screenBrightness = 1.0f;
        getWindow().setAttributes(params);
    } else {
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        WindowManager.LayoutParams params = getWindow().getAttributes();
        params.screenBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE;
        getWindow().setAttributes(params);
    }

The problem is,

after switching to 'full Brightness', when I change the activity, the brightness goes normal. Now, How can I keep track of the 'brightness setting' from 'main activity' and apply it to the other activities of the app?

N.B. I don't want to change system brightness. Brightness will only change while using the app.

Thanks In Advance.

Upvotes: 1

Views: 340

Answers (2)

Sayem
Sayem

Reputation: 86

ok. Finally solved my problem.

  1. I have created a class having the logic of brightness controlling using SharedPreferences to Handle the state. code: 

     if (br.getString("set", "").equals("1")) {
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    WindowManager.LayoutParams params = getWindow().getAttributes();
    params.screenBrightness = 1.0f;
    getWindow().setAttributes(params);
} else {
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    WindowManager.LayoutParams params = getWindow().getAttributes();
    params.screenBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE;
    getWindow().setAttributes(params);
}

  2. Then extend the class with the activities and initialize SharedPreferences in onCreate method.

     br = getSharedPreferences("br", Activity.MODE_PRIVATE);

Thank you @0X0nosugar for the idea.

Upvotes: 1

Jeffrey Blattman
Jeffrey Blattman

Reputation: 22637

You need to hold a SCREEN_BRIGHT_WAKE_LOCK if you want it to have an effect beyond your activity. The method you are using above applies to the foreground window, and when you activity goes away that no longer applies.

Note Android generally frowns on use of wake locks because it's easy to screw up and not release them, wasting the devices battery. They recommend the window param version for the vary reason that it automatically releases when the user leaves the activity.

Upvotes: 0

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