Create /res/raw/ folder in your Android Studio project. Refer: Android Studio error: Expected resource of type raw
Modify layout/activity_main.xml to add button to "Load Wallpaper from from Resources".
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context="com.blogspot.android_er.androidwallpaper.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<Button
android:id="@+id/displaywp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Display Wallpaper"/>
<Button
android:id="@+id/loadwp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Load Wallpaper from Gallery"/>
<Button
android:id="@+id/loadwpres"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Load Wallpaper from from Resources"/>
<Button
android:id="@+id/restorewp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Restore default Wallpaper"/>
<ImageView
android:id="@+id/image"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
MainActivity.java
package com.blogspot.android_er.androidwallpaper;
import android.app.Activity;
import android.app.WallpaperManager;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.FileNotFoundException;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
ImageView imageWallpaper;
Button btnLoadWallpaper, btnDisplayWallpaper, btnRestoreWallpaper;
Button btnLoadWallpaperRes;
private static final int RQS_OPEN_IMAGE = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageWallpaper = (ImageView)findViewById(R.id.image);
btnDisplayWallpaper = (Button)findViewById(R.id.displaywp);
btnDisplayWallpaper.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
displayWallpaper();
}
});
btnLoadWallpaper = (Button)findViewById(R.id.loadwp);
btnLoadWallpaper.setOnClickListener(btnLoadWallpaperOnClickListener);
btnRestoreWallpaper = (Button)findViewById(R.id.restorewp);
btnRestoreWallpaper.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
WallpaperManager myWallpaperManager =
WallpaperManager.getInstance(getApplicationContext());
try {
myWallpaperManager.clear();
} catch (IOException e) {
e.printStackTrace();
}
}
});
btnLoadWallpaperRes = (Button)findViewById(R.id.loadwpres);
btnLoadWallpaperRes.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
WallpaperManager myWallpaperManager =
WallpaperManager.getInstance(getApplicationContext());
try {
myWallpaperManager.setResource(R.raw.androidstudio);
} catch (IOException e) {
e.printStackTrace();
}
}
});
displayWallpaper();
}
View.OnClickListener btnLoadWallpaperOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
if (Build.VERSION.SDK_INT >=
Build.VERSION_CODES.KITKAT) {
intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
} else {
intent.setAction(Intent.ACTION_GET_CONTENT);
}
intent.addCategory(Intent.CATEGORY_OPENABLE);
// set MIME type for image
intent.setType("image/*");
startActivityForResult(intent, RQS_OPEN_IMAGE);
}
};
private void displayWallpaper(){
WallpaperManager myWallpaperManager =
WallpaperManager.getInstance(getApplicationContext());
Drawable drawableWallpaper = myWallpaperManager.getDrawable();
imageWallpaper.setImageDrawable(drawableWallpaper);
Toast.makeText(this,
drawableWallpaper.getMinimumWidth() + " x " + drawableWallpaper.getMinimumHeight()
+ "\n" +
drawableWallpaper.getIntrinsicWidth() + " x " + drawableWallpaper.getIntrinsicHeight(),
Toast.LENGTH_LONG).show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK) {
if (requestCode == RQS_OPEN_IMAGE) {
Uri dataUri = data.getData();
Uri wallpaperUri = dataUri;
Toast.makeText(this, wallpaperUri.toString(), Toast.LENGTH_LONG).show();
Bitmap newOriginalBM= loadBitmap(dataUri);
reloadWallpaper(newOriginalBM);
}
}
}
private Bitmap loadBitmap(Uri src) {
Bitmap bm = null;
try {
bm = BitmapFactory.decodeStream(
getBaseContext().getContentResolver().openInputStream(src));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return bm;
}
private void reloadWallpaper(Bitmap bm){
if(bm != null){
WallpaperManager myWallpaperManager =
WallpaperManager.getInstance(getApplicationContext());
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if(myWallpaperManager.isWallpaperSupported()){
try {
myWallpaperManager.setBitmap(bm);
} catch (IOException e) {
e.printStackTrace();
}
}else{
Toast.makeText(MainActivity.this,
"isWallpaperSupported() NOT SUPPORTED",
Toast.LENGTH_LONG).show();
}
}else{
try {
myWallpaperManager.setBitmap(bm);
} catch (IOException e) {
e.printStackTrace();
}
}
}else{
Toast.makeText(MainActivity.this, "bm == null", Toast.LENGTH_LONG).show();
}
}
}
uses-permission of "android.permission.SET_WALLPAPER" is needed.
