How to create WALLPAPER APP in Android Studio: Complete Source Code...

Download the Source Code of the Wallpaper App (Github) - CLICK HERE

FullScreenActivity.java

package android.tutorials.wallpaperapp;

import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;

import android.app.DownloadManager;

import android.app.WallpaperManager;

import android.content.Context;

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.drawable.BitmapDrawable;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.provider.ContactsContract;

import android.provider.Settings;

import android.view.View;

import android.widget.Toast;

import com.bumptech.glide.Glide;

import com.github.chrisbanes.photoview.PhotoView;

import com.karumi.dexter.Dexter;

import com.karumi.dexter.PermissionToken;

import com.karumi.dexter.listener.PermissionDeniedResponse;

import com.karumi.dexter.listener.PermissionGrantedResponse;

import com.karumi.dexter.listener.PermissionRequest;

import com.karumi.dexter.listener.single.PermissionListener;

import java.io.File;

import java.io.IOException;

public class FullScreenActivity extends AppCompatActivity {

String originalUrl;

PhotoView photoView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_full_screen);

getSupportActionBar().hide();

Intent intent = getIntent();

originalUrl = intent.getStringExtra("originalUrl");

photoView =findViewById(R.id.photoView);

Glide.with(this).load(originalUrl).into(photoView);

}

public void SetWallpaper(View view) {

WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);

Bitmap bitmap = ((BitmapDrawable) photoView.getDrawable()).getBitmap();

try {

wallpaperManager.setBitmap(bitmap);

} catch (IOException e) {

e.printStackTrace();

}

Toast.makeText(this, "Wallpaper Set Successfully!!!", Toast.LENGTH_SHORT).show();

}

public void DownloadWallpaper(View view) {

Dexter.withActivity(this)

.withPermission(Manifest.permission.READ_EXTERNAL_STORAGE)

.withListener(new PermissionListener() {

@Override

public void onPermissionGranted(PermissionGrantedResponse permissionGrantedResponse) {

DownloadManager downloadManager =(DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);

Uri uri = Uri.parse(originalUrl);

DownloadManager.Request request = new DownloadManager.Request(uri);

request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

String subPath = "Wallpaper App" + "/" +System.currentTimeMillis() + ".png";

request.setDestinationInExternalPublicDir(Environment.DIRECTORY_PICTURES, subPath);

downloadManager.enqueue(request);

Uri uri1 = Uri.parse(subPath);

Intent intent =new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);

intent.setData(uri1);

startActivity(intent);

Toast.makeText(FullScreenActivity.this, "Downloading Wallpaper Started...", Toast.LENGTH_SHORT).show();

}

@Override

public void onPermissionDenied(PermissionDeniedResponse permissionDeniedResponse) {

Intent intent = new Intent();

intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);

Uri uri = Uri.fromParts("package",getPackageName(),null);

intent.setData(uri);

startActivity(intent);

}

@Override

public void onPermissionRationaleShouldBeShown(PermissionRequest permissionRequest, PermissionToken permissionToken) {

permissionToken.continuePermissionRequest();

}

}).check();

}

MainActivity.java

package android.tutorials.wallpaperapp;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AlertDialog;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.GridLayoutManager;

import androidx.recyclerview.widget.RecyclerView;

import android.content.DialogInterface;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.AbsListView;

import android.widget.EditText;

import com.android.volley.AuthFailureError;

import com.android.volley.Request;

import com.android.volley.RequestQueue;

import com.android.volley.Response;

import com.android.volley.VolleyError;

import com.android.volley.toolbox.StringRequest;

import com.android.volley.toolbox.Volley;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class MainActivity extends AppCompatActivity {

RecyclerView recyclerView;

WallpaperAdapter wallpaperAdapter;

List<WallpaperModel> wallpaperModelList;

int pageNumber = 1;

Boolean isScrolling = false;

int currentItems, totalItems, scrollOutItems;

String url = "https://api.pexels.com/v1/curated/?page="+pageNumber+"&per_page=80";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//Casting all things

recyclerView = findViewById(R.id.recyclerView);

wallpaperModelList = new ArrayList<>();

wallpaperAdapter = new WallpaperAdapter(this, wallpaperModelList);

recyclerView.setAdapter(wallpaperAdapter);

GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 2);

recyclerView.setLayoutManager(gridLayoutManager);

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {

@Override

public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {

super.onScrollStateChanged(recyclerView, newState);

if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL){

isScrolling = true;

}

@Override

public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {

super.onScrolled(recyclerView, dx, dy);

currentItems = gridLayoutManager.getChildCount();

totalItems = gridLayoutManager.getItemCount();

scrollOutItems = gridLayoutManager.findFirstVisibleItemPosition();

if (isScrolling && (currentItems + scrollOutItems == totalItems)){

isScrolling = false;

fetchWallpaper();

}

});

fetchWallpaper();

}

public void fetchWallpaper() {

StringRequest request = new StringRequest(Request.Method.GET, url,

new Response.Listener<String>() {

@Override

public void onResponse(String response) {

try {

JSONObject jsonObject = new JSONObject(response);

JSONArray jsonArray = jsonObject.getJSONArray("photos");

int length = jsonArray.length();

for (int i = 0; i < length; i++) {

JSONObject object = jsonArray.getJSONObject(i);

int id = object.getInt("id");

JSONObject objectImages = object.getJSONObject("src");

String originalUrl = objectImages.getString("original");

String mediumUrl = objectImages.getString("medium");

WallpaperModel wallpaperModel = new WallpaperModel(id, originalUrl, mediumUrl);

wallpaperModelList.add(wallpaperModel);

}

wallpaperAdapter.notifyDataSetChanged();

pageNumber++;

} catch (JSONException e) {

e.printStackTrace();

}

new Response.ErrorListener() {

@Override

public void onErrorResponse(VolleyError error) {

}

}){

@Override

public Map<String, String> getHeaders() throws AuthFailureError {

Map<String, String> params = new HashMap<>();

params.put("Authorization","563492ad6f917000010000018c8c95b063244287b5054c46da8687d7");

return params;

}

};

RequestQueue queue = Volley.newRequestQueue(getApplicationContext());

queue.add(request);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.main,menu);

return super.onCreateOptionsMenu(menu);

}

@Override

public boolean onOptionsItemSelected(@NonNull MenuItem item) {

if (item.getItemId() == R.id.nav_search){

AlertDialog.Builder builder = new AlertDialog.Builder(this);

final EditText editText = new EditText(this);

editText.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);

builder.setView(editText);

builder.setMessage("Enter the Category e.g. Car");

builder.setTitle("Search Wallpaper");

builder.setPositiveButton("Search", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

String query = editText.getText().toString().toLowerCase();

url = "https://api.pexels.com/v1/curated/?page="+pageNumber+"&per_page=80&query="+query;

wallpaperModelList.clear();

fetchWallpaper();

}

}).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

dialog.cancel();

}

}).show();

}

return super.onOptionsItemSelected(item);

}

@Override

public void onBackPressed() {

AlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setTitle("Android Tutorials");//Are you sure you want to Exit ?

builder.setMessage("Subscribe this Channel for more Android Tutorials"); //Thanks for using our Wallpaper App. Give your vauable feedback

builder.setCancelable(false);

builder.setPositiveButton("YES", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

finishAffinity();

}

});

builder.setNegativeButton("NO", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

dialog.dismiss();

}

});

builder.setNeutralButton("RATE US !", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

String url = "https://play.google.com/store/apps/details?id="+ getApplicationContext().getPackageName();

Uri uri = Uri.parse(url);

Intent intent = new Intent(Intent.ACTION_VIEW,uri);

startActivity(intent);

}

});

AlertDialog alertDialog = builder.create();

alertDialog.show();

}

WallpaperAdapter.java

package android.tutorials.wallpaperapp;

import android.content.Context;

import android.content.Intent;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ImageView;

import androidx.annotation.NonNull;

import androidx.recyclerview.widget.RecyclerView;

import com.bumptech.glide.Glide;

import java.util.List;

public class WallpaperAdapter extends RecyclerView.Adapter<WallpaperViewHolder> {

private Context context;

List<WallpaperModel> wallpaperModels;

public WallpaperAdapter(Context context, List<WallpaperModel> wallpaperModels) {

this.context = context;

this.wallpaperModels = wallpaperModels;

}

@NonNull

@Override

public WallpaperViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

View view = LayoutInflater.from(context).inflate(R.layout.wallpaper_item,parent,false);

return new WallpaperViewHolder(view);

}

@Override

public void onBindViewHolder(@NonNull WallpaperViewHolder holder, int position) {

Glide.with(context).load(wallpaperModels.get(position).getMediumUrl()).into(holder.imageView);

holder.imageView.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

context.startActivity(new Intent(context, FullScreenActivity.class)

.putExtra("originalUrl", wallpaperModels.get(position).getOriginalUrl()));

}

});

}

@Override

public int getItemCount() {

return wallpaperModels.size();

}

class WallpaperViewHolder extends RecyclerView.ViewHolder{

ImageView imageView;

public WallpaperViewHolder(@NonNull View itemView) {

super(itemView);

imageView = itemView.findViewById(R.id.imageViewItem);

}

WallpaperModel.java

package android.tutorials.wallpaperapp;

public class WallpaperModel {

private int id;
private String originalUrl, mediumUrl;

public WallpaperModel() {
}

public WallpaperModel(int id, String originalUrl, String mediumUrl) {
this.id = id;
this.originalUrl = originalUrl;
this.mediumUrl = mediumUrl;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getOriginalUrl() {
return originalUrl;
}

public void setOriginalUrl(String originalUrl) {
this.originalUrl = originalUrl;
}

public String getMediumUrl() {
return mediumUrl;
}

public void setMediumUrl(String mediumUrl) {
this.mediumUrl = mediumUrl;
}
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="android.tutorials.wallpaperapp">

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

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.WallpaperApp">
<activity android:name=".FullScreenActivity"/>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

build.gradle

plugins {
id 'com.android.application'
id 'com.google.gms.google-services'
id 'com.google.firebase.firebase-perf'
}

android {
compileSdkVersion 29

defaultConfig {
applicationId "android.tutorials.wallpaperapp"
minSdkVersion 21
targetSdkVersion 29
versionCode 1
versionName "1.0"

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}

buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}

dependencies {

implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.2.1'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation 'com.google.firebase:firebase-analytics:18.0.0'
implementation 'com.google.firebase:firebase-perf:19.0.9'
implementation 'com.google.firebase:firebase-messaging:21.0.0'
implementation 'com.google.firebase:firebase-inappmessaging-display:19.1.2'
testImplementation 'junit:junit:4.13.1'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

//Volley Library
implementation 'com.android.volley:volley:1.1.1'

//Dexter Library
implementation 'com.karumi:dexter:6.2.1'

//Glide Library
implementation 'com.github.bumptech.glide:glide:4.11.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'

//photoview Library
implementation 'com.github.chrisbanes:PhotoView:2.3.0'
}

activity_full_screen.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:background="@color/black"
tools:context=".FullScreenActivity">

<com.github.chrisbanes.photoview.PhotoView
android:id="@+id/photoView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/downloadWallpaper" />

<Button
android:id="@+id/downloadWallpaper"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@id/setWallpaper"
android:layout_margin="5dp"
android:onClick="DownloadWallpaper"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:text="DOWNLOAD WALLPAPER" />

<Button
android:id="@+id/setWallpaper"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_margin="5dp"
android:onClick="SetWallpaper"
android:padding="10dp"
android:text="Set Wallpaper" />

</RelativeLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".MainActivity">

<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

wallpaper_item.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="275dp">

<ImageView
android:id="@+id/imageViewItem"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="2.5dp"
android:scaleType="centerCrop" />

</androidx.constraintlayout.widget.ConstraintLayout>

mail.xml

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto">

<item

android:title="SEARCH"

app:showAsAction="always"

android:id="@+id/nav_search"/>

</menu>