title: How to give permission for changing screen brightness in Marshmallow
body: <p>I am using following code to increase brightness. It is properly working in devices which are below Marshmallow. It is crashing in Marshmallow, and I did not find anything to give dynamic permission for Write-settings. Anybody has idea please help me.</p>
  
  <pre><code>Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); 
      Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 255);
  
  int br = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
      WindowManager.LayoutParams lp = getWindow().getAttributes();
      lp.screenBrightness = (float) br / 255;
      getWindow().setAttributes(lp);
  </code></pre>
  
  <p>Error Log:</p>
  
  <pre><code>java.lang.SecurityException: com.package was not granted  this permission: android.permission.WRITE_SETTINGS.
     at                 android.provider.Settings.isCallingPackageAllowedToPerformAppOpsProtectedOperation(Settings.java:8465)
     at    android.provider.Settings.checkAndNoteWriteSettingsOperation(Settings.java:8338)
  at com.android.providers.settings.SettingsProvider.mutateSystemSetting(SettingsProvider.java:899)
  at com.android.providers.settings.SettingsProvider.insertSystemSetting(SettingsProvider.java:874)
  at com.android.providers.settings.SettingsProvider.call(SettingsProvider.java:257)
  at android.content.ContentProvider$Transport.call(ContentProvider.java:398)
  at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:283)
  at android.os.Binder.execTransact(Binder.java:453)
  </code></pre>