Gallery Application Java Code

Java Code Gallay Application

package com.example.gallery;

import androidx.appcompat.app.AppCompatActivity;

import android.app.WallpaperManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.IOException;


public class MainActivity extends AppCompatActivity {

    Integer imgarr[] = {
            R.drawable.img1,R.drawable.img2,R.drawable.img3,
            R.drawable.img4,R.drawable.img5,R.drawable.img6,R.drawable.img7

    };
    int currimg = 4;


    public void previous(View view){
        if(currimg == 0){
            currimg = 4;
        }
        currimg--;
        ImageView iv = (ImageView)findViewById(R.id.imagedsply);
        iv.setImageResource(imgarr[currimg]);
    }
    public void next(View view){
        if(currimg == 6){
            currimg = 4;
        }
        currimg++;
        ImageView iv = (ImageView)findViewById(R.id.imagedsply);
        iv.setImageResource(imgarr[currimg]);
    }

    //Setting Wallpaper

    private void setWallpaper(){
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), imgarr[currimg]);
        WallpaperManager manager = WallpaperManager.getInstance(getApplicationContext());
        try{
            manager.setBitmap(bitmap);
            Toast.makeText(this, "Wallpaper set!", Toast.LENGTH_SHORT).show();
        } catch (IOException e) {
            Toast.makeText(this, "Error!", Toast.LENGTH_SHORT).show();
        }

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        Button button = (Button) findViewById(R.id.wallbtn);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                setWallpaper();
            }
        });
    }
}