Taking a screenshot of a particular view

private void takeScreenShot()
{
    Bitmap viewBitmap = Bitmap.createBitmap(lnr_takshot.getWidth(), lnr_takshot.getHeight(), Bitmap.Config.RGB_565);
    Canvas viewCanvas = new Canvas(viewBitmap);
    Drawable backgroundDrawable = lnr_takshot.getBackground();

    if(backgroundDrawable != null){
        // Draw the background onto the canvas.
        backgroundDrawable.draw(viewCanvas);
    }
    else{
        viewCanvas.drawColor(Color.GREEN);
        // Draw the view onto the canvas.
        lnr_takshot.draw(viewCanvas);
    }

    // Write the bitmap generated above into a file.
    String fileStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    OutputStream outputStream = null;
    try{
        imgFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), fileStamp + ".png");
        outputStream = new FileOutputStream(imgFile);
        viewBitmap.compress(Bitmap.CompressFormat.PNG, 40, outputStream);
        outputStream.close();
        txt_content.setText("Path : "+imgFile.getAbsolutePath());
    }
    catch(Exception e){
        e.printStackTrace();
        txt_content.setText("Error while taking screenshot: "+e.getMessage());
    }

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:app="https://schemas.android.com/apk/res-auto"
    xmlns:tools="https://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#49D6E6"
    tools:context=".MainActivity">

   <LinearLayout
       android:id="@+id/lnr_takshot"
       android:layout_width="match_parent"
       android:layout_weight="1"
       android:background="#FFF"
       android:layout_margin="5dp"
       android:layout_height="match_parent">
       <ImageView
           android:layout_width="match_parent"
           android:src="@drawable/chuki"
           android:layout_height="match_parent" />

   </LinearLayout>
    <TextView
        android:id="@+id/txt_content"
        android:layout_width="wrap_content"
        android:layout_gravity="center"
        android:text=""
        android:textColor="#FFF"
        android:textSize="20sp"
        android:layout_margin="5dp"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/btn_takeshot"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_gravity="center"
        android:text="Take ScreenShot"
        android:textColor="#FFF"
        android:minEms="8"
        android:layout_margin="20dp"
        android:background="#C731E0"
        />

</LinearLayout>

package com.rrtutors.capturescreenshot;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MainActivity extends AppCompatActivity {

    TextView txt_content;
    Button btn_takeshot;
    LinearLayout lnr_takshot;
    File imgFile;
    int EXTERNAL_STORAGE_PERMISSION=200;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txt_content=findViewById(R.id.txt_content);
        btn_takeshot=findViewById(R.id.btn_takeshot);
        lnr_takshot=findViewById(R.id.lnr_takshot);
        btn_takeshot.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                txt_content.setText("");
                checkPermisstions();
               }
        });
    }

    private void takeScreenShot()
    {
        Bitmap viewBitmap = Bitmap.createBitmap(lnr_takshot.getWidth(), lnr_takshot.getHeight(), Bitmap.Config.RGB_565);
        Canvas viewCanvas = new Canvas(viewBitmap);
        Drawable backgroundDrawable = lnr_takshot.getBackground();

        if(backgroundDrawable != null){
            // Draw the background onto the canvas.
            backgroundDrawable.draw(viewCanvas);
        }
        else{
            viewCanvas.drawColor(Color.GREEN);
            // Draw the view onto the canvas.
            lnr_takshot.draw(viewCanvas);
        }

        // Write the bitmap generated above into a file.
        String fileStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        OutputStream outputStream = null;
        try{
            imgFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), fileStamp + ".png");
            outputStream = new FileOutputStream(imgFile);
            viewBitmap.compress(Bitmap.CompressFormat.PNG, 40, outputStream);
            outputStream.close();
            txt_content.setText("Path : "+imgFile.getAbsolutePath());
        }
        catch(Exception e){
            e.printStackTrace();
            txt_content.setText("Error while taking screenshot: "+e.getMessage());
        }

    }

    private void checkPermisstions()
    {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

            if(ContextCompat.checkSelfPermission(
                    getApplicationContext(),
                    Manifest.permission.WRITE_EXTERNAL_STORAGE
            ) == PackageManager.PERMISSION_GRANTED)  {
                // You can use the API that requires the permission.
                takeScreenShot();
            }else
            {
                requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},EXTERNAL_STORAGE_PERMISSION);
            }
        }else
        {
            takeScreenShot();
        }

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if(grantResults.length>0)
        {
            takeScreenShot();
        }
    }
}

private void checkPermisstions()
{
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

        if(ContextCompat.checkSelfPermission(
                getApplicationContext(),
                Manifest.permission.WRITE_EXTERNAL_STORAGE
        ) == PackageManager.PERMISSION_GRANTED)  {
            // You can use the API that requires the permission.
            takeScreenShot();
        }else
        {
            requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},EXTERNAL_STORAGE_PERMISSION);
        }
    }else
    {
        takeScreenShot();
    }

}

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>