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POBrightness Control Not Reflecting on the Device
 

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    <p>I am trying to imitate the Andorid setting widget that can control the brightness of the device. It works as intended and I can see that see in the settings. But I don't see the device brighten.</p> <p>Here is the code:</p> <pre><code>WindowManager.LayoutParams lp = getWindow().getAttributes(); SeekBar brightnessControl = (SeekBar) findViewById(R.id.sbBrightness); int currentBrightness = 10; brightnessControl.setProgress(currentBrightness); lp.screenBrightness = currentBrightness/100f; brightnessControl.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar seekBar) {} @Override public void onStartTrackingTouch(SeekBar seekBar) {} @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { //set local brightness WindowManager.LayoutParams lp = getWindow().getAttributes(); progress = (progress &lt;= 10)?10:progress; lp.screenBrightness = progress/100f; getWindow().setAttributes(lp); //put local to system wide brightness int sysWideBrightness = (int) (progress/100f * 255); android.provider.Settings.System.putInt( getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS, sysWideBrightness); } }); </code></pre> <p>I would mention that this activity is fired on an Activity tab. Before putting it in a tab it works fine, but not it doesn't. </p> <p>I notice that when I put a new version of android on my device (now 4.2.2 rooted) it was able to work as intended. I tested it on a rooted gingerbread device it doesn't work. </p> <p>This might help, this is the Main.java file and here is how the ActivityTab is initiated.</p> <pre><code>protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); /* TabHost will have Tabs */ tabHost = (TabHost)findViewById(android.R.id.tabhost); TabSpec firstTabSpec = tabHost.newTabSpec("tid1"); TabSpec secondTabSpec = tabHost.newTabSpec("tid2"); TabSpec thirdTabSpec = tabHost.newTabSpec("tid3"); TabSpec fourthTabSpec = tabHost.newTabSpec("tid4"); TabSpec fifthTabSpec = tabHost.newTabSpec("tid5"); firstTabSpec.setIndicator("", getResources().getDrawable(R.drawable.clear_cache_tab)).setContent(showClearCache()); secondTabSpec.setIndicator("", getResources().getDrawable(R.drawable.move_sd_tab)).setContent(showMoveToSd()); thirdTabSpec.setIndicator("", getResources().getDrawable(R.drawable.remove_app_tab)).setContent(showRemoveApp()); fourthTabSpec.setIndicator("", getResources().getDrawable(R.drawable.feature_manager_tab)).setContent(showFeatureManager()); fifthTabSpec.setIndicator("", getResources().getDrawable(R.drawable.feature_manager_tab)).setContent(showProcessKill()); tabHost.setOnTabChangedListener(this); tabHost.addTab(firstTabSpec); tabHost.addTab(secondTabSpec); tabHost.addTab(thirdTabSpec); tabHost.addTab(fourthTabSpec); tabHost.addTab(fifthTabSpec); for(int i=0;i&lt;tabHost.getTabWidget().getChildCount();i++) { tabHost.getTabWidget().getChildAt(i).setBackgroundColor(Color.parseColor("#303030")); } tabHost.getTabWidget().setCurrentTab(0); tabHost.getTabWidget().getChildAt(0).setBackgroundColor(Color.parseColor("#C8C8C8")); } @Override public void onTabChanged(String tabId) { // TODO Auto-generated method stub for(int i=0;i&lt;tabHost.getTabWidget().getChildCount();i++) { tabHost.getTabWidget().getChildAt(i).setBackgroundColor(Color.parseColor("#303030")); } tabHost.getTabWidget().getChildAt(tabHost.getCurrentTab()).setBackgroundColor(Color.parseColor("#C8C8C8")); } </code></pre>
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