How to increase and decrease screen brightness programmatically in android studio

Hello friends today we are learn how to increase and decrease brightness of device programmatically.whose code is given below.

                                                                    

 

 activity_main.xml 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context=".MainActivity">

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true">

        <SeekBar
            android:id="@+id/brightnessControl"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:layout_marginBottom="6dp"
            android:max="100"
            android:progress="50" />

        <TextView
            android:id="@+id/brightnessValue"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/brightnessControl"
            android:layout_centerInParent="true"
            android:layout_marginTop="20dp"
            android:padding="16dp"
            android:text="0.5"
            android:textColor="#000000"
            android:textSize="22sp" />
    </RelativeLayout>
</RelativeLayout>

Here you are shown a mainactivity.xml layout in which I use a textview and a seekbar.

 MainActivity.java 

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.WindowManager;
import android.widget.SeekBar;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    SeekBar seekBar;
    TextView textView;
    Float backLightValue = 0.5f;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        seekBar = findViewById(R.id.brightnessControl);
        textView = findViewById(R.id.brightnessValue);
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override

            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                backLightValue = (float) progress / 100;
                textView.setText(String.valueOf(backLightValue));
                WindowManager.LayoutParams layoutParams = getWindow().getAttributes();
                layoutParams.screenBrightness = backLightValue;
                getWindow().setAttributes(layoutParams);

            }

            @Override

            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override

            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    }
}

Here I fetch ui attributes like seekBar and Textview where we performed some oprations

like seekbar.setOnSeekBarChangeListener whose contain two override method 

onStartTrackingTouch(SeekBar seekBar) and onStopTrackingTouch.

Here is the screenshot of how the app will work.

Thank you