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  1. PO
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    <p>I had the same problem.</p> <p>Two solutions:</p> <p>here, brightness =<code>(int) 0 to 100 range</code> as i am using progressbar</p> <p><strong>1 SOLUTION</strong></p> <pre><code>float brightness = brightness / (float)255; WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.screenBrightness = brightness; getWindow().setAttributes(lp); </code></pre> <p><strong>2 SOLUTION</strong></p> <p>I just used dummy activity to call when my progress bar <code>stop</code> seeking.</p> <pre><code> Intent intent = new Intent(getBaseContext(), DummyBrightnessActivity.class); Log.d("brightend", String.valueOf(brightness / (float)255)); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //this is important //in the next line 'brightness' should be a float number between 0.0 and 1.0 intent.putExtra("brightness value", brightness / (float)255); getApplication().startActivity(intent); </code></pre> <p>Now coming to the DummyBrightnessActivity.class</p> <pre><code> public class DummyBrightnessActivity extends Activity{ private static final int DELAYED_MESSAGE = 1; private Handler handler; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); handler = new Handler() { @Override public void handleMessage(Message msg) { if(msg.what == DELAYED_MESSAGE) { DummyBrightnessActivity.this.finish(); } super.handleMessage(msg); } }; Intent brightnessIntent = this.getIntent(); float brightness = brightnessIntent.getFloatExtra("brightness value", 0); WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.screenBrightness = brightness; getWindow().setAttributes(lp); Message message = handler.obtainMessage(DELAYED_MESSAGE); //this next line is very important, you need to finish your activity with slight delay handler.sendMessageDelayed(message,200); } } </code></pre> <p>don't forget to register DummyBrightnessActivity to manifest.</p> <p>hope it helps!!</p>
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    1. POChange the System Brightness Programmatically
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    1. USBhoomika Brahmbhatt
    1. USBhoomika Brahmbhatt
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    1. COI am Doing it in a Custom Dialog. and it is not working. again i want to change overall system brightness. i run the code and then check system settings brightness and it was not effected
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      1. USUsman Riaz
    2. COthat code will change overall system brightness.
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      1. USBhoomika Brahmbhatt
    3. COfirst check it with static value in `brightness` between 0 to 100..then use dynamic value..put <uses-permission android:name="android.permission.WRITE_SETTINGS"/>
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      1. USBhoomika Brahmbhatt
 

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