Sample to Control Screen Brightness

Hello Everybody,

this sample help us to create Screen Brightness Controller.

1) Add sample Activity:
public class MainActivity extends Activity {
  private static final String BRIGHTNESS_PREFERENCE_KEY = "brightness";
  private View brightnessView;
  private SeekBar brightnessControl;
  private int brightness = 50;

  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.brightness);
      brightnessView = findViewById(R.id.brightnessView);
      brightnessControl = (SeekBar) findViewById(R.id.seek);

      Button btn = (Button) findViewById(R.id.btnShowBrightness);
      btn.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              showBrightness();
          }
      });

      brightnessControl.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
          public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
              setBrightness(progress);
          }

          public void onStartTrackingTouch(SeekBar seekBar) {
          }

          public void onStopTrackingTouch(SeekBar seekBar) {
              hideBrightness();
          }
      });
  }

  private void showBrightnessView() {
      Animation animation = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);
      brightnessControl.setProgress(this.brightness);
      brightnessView.setVisibility(View.VISIBLE);
      brightnessView.startAnimation(animation);
  }

  private void setBrightness(int value) {
      if (value < 10) {
          value = 10;
      } else if (value > 100) {
          value = 100;
      }
      brightness = value;
      WindowManager.LayoutParams lp = getWindow().getAttributes();
      lp.screenBrightness = (float) value / 100;     
      lp.flags |= WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
      getWindow().setAttributes(lp);
  }

  private void hideBrightnessView() {
      Animation animation = AnimationUtils.loadAnimation(MainActivity.this, android.R.anim.slide_out_right);
      brightnessView.startAnimation(animation);
      brightnessView.setVisibility(View.GONE);
      PreferenceManager.getDefaultSharedPreferences(this).edit().putInt(BRIGHTNESS_PREFERENCE_KEY, brightnessControl.getProgress()).commit();
  }
}

2) Add layout to your brightness.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/mainLayout"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical">

   <Button
         android:text="Show Brightness Control"
         android:id="@+id/btnShowBrightness"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"/>

       <LinearLayout
              android:id="@+id/brightnessView"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:layout_alignParentBottom="true"
              android:paddingTop="10dip"
              android:paddingBottom="30dip"
              android:paddingLeft="20dip"
              android:paddingRight="20dip"
              android:gravity="center_horizontal"
              android:visibility="visible">

       <TextView
              android:text="Brightness Level"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:gravity="center"
              android:textAppearance="?android:attr/textAppearanceLarge" />
    
       <SeekBar 
              android:id="@+id/seek"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:max="100"
              android:progress="100"/>
       </LinearLayout>
</LinearLayout>


3) Also please add
<uses-permission android:name="android.permission.HARDWARE_TEST"></uses-permission>
to your Manifest file.