changing brightness from Service android

问题

I want to change brightness of android device from a service. I have seen a lot of questions on stack overflow on this but none of them has solved my problem.

I have done every thing from setting brightness in settingsManger, starting a new activity etc but none of them is working for me.

回答1:

try as

   android.provider.Settings.System.putInt(getContentResolver(),
   android.provider.Settings.System.SCREEN_BRIGHTNESS,
   BRIGHTNESS_Value);

and add permission in Manifest.xml

<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
<uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />
</manifest>

Edit: try as:

public class ExampleService extends Service {

    @Override
    public void onCreate() {
        // The service is being created
        // set SCREEN_BRIGHTNESS
        android.provider.Settings.System.putInt(getContentResolver(),
        android.provider.Settings.System.SCREEN_BRIGHTNESS,
        BRIGHTNESS_Value);
        /// start new Activity
        Intent intent = new Intent(getBaseContext(), ExampleActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        getApplication().startActivity(intent);
    }

    @Override
    public IBinder onBind(Intent intent) {
        // A client is binding to the service with bindService()
        return mBinder;
    }
}

public class ExampleActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // The activity is being created.

    }

    @Override
    protected void onResume() {
        super.onResume();
        // The activity has become visible (it is now "resumed").
        this.finish();
    }
  }

回答2:

Found answer : Create an invisible activity, and do not finish() it. Make all the changes in activity

Code for dummy activity:

public class DummyActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.dummy_layout);
    int progress = getIntent().getIntExtra("brightness", 0);
    WindowManager.LayoutParams layoutParams = getWindow().getAttributes();
    layoutParams.screenBrightness = progress/255.0f;
    getWindow().setAttributes(layoutParams);


    Toast.makeText(this, "Came in Dummy Activity", Toast.LENGTH_SHORT).show();
}
@Override
protected void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();
}

}

回答3:

Even if u call finish after the toast, it works. I tried it.

Actually even if u do not call the dummy activity, it works. Its just that you wont see the display brightness changing(visibly), even though it is putting the value correctly in brightness in settings.

If u go Settings>Display>Brightness while your app is running in the background, the change in display brightness is visible.

Don't know why is this though.

回答4:

I wanted same as you...

I also failed to find, Finally I had to implement...

Change brightness according to surrounding light in android

来源：https://stackoverflow.com/questions/11306049/changing-brightness-from-service-android

标签

android

android-screen