Use Wallpaper manager

app/build.gradle

@@ -3,15 +3,15 @@ plugins {
 }
 
 android {
-    compileSdkVersion 31
+    compileSdkVersion 32
     buildToolsVersion "30.0.3"
 
     defaultConfig {
         applicationId "net.crystalyx.setaswallpaper"
-        minSdkVersion 23
-        targetSdkVersion 31
-        versionCode 6
-        versionName "2.4"
+        minSdkVersion 14
+        targetSdkVersion 32
+        versionCode 7
+        versionName "3.0"
     }
 
     buildTypes {

app/src/main/AndroidManifest.xml

@@ -3,10 +3,9 @@
           package="net.crystalyx.setaswallpaper">
 
     <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.SET_WALLPAPER" />
 
     <application
-            android:allowBackup="false"
-            android:usesCleartextTraffic="true"
             android:label="Set as wallpaper"
             android:icon="@mipmap/ic_launcher"
             android:roundIcon="@mipmap/ic_launcher_round"
@@ -24,14 +23,6 @@
                 <data android:mimeType="text/plain"/>
             </intent-filter>
         </activity>
-
-        <provider android:authorities="net.crystalyx.setaswallpaper.provider"
-                  android:name="androidx.core.content.FileProvider"
-                  android:grantUriPermissions="true"
-                  android:exported="false">
-            <meta-data android:name="android.support.FILE_PROVIDER_PATHS"
-                       android:resource="@xml/file_paths"/>
-        </provider>
     </application>
 
 </manifest>

app/src/main/java/net/crystalyx/setaswallpaper/SetWallpaperActivity.java

@@ -1,29 +1,27 @@
 package net.crystalyx.setaswallpaper;
 
 import android.app.Activity;
+import android.app.WallpaperManager;
 import android.content.Intent;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
 import android.net.Uri;
 import android.os.Bundle;
 import android.widget.Toast;
-import androidx.core.content.FileProvider;
 
 import java.io.*;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLConnection;
-import java.util.Random;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
 public class SetWallpaperActivity extends Activity {
 
-    private boolean toBeFinished;
-
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        toBeFinished = false;
         Intent intent = getIntent();
         String type = intent.getType();
 
@@ -31,44 +29,11 @@ public class SetWallpaperActivity extends Activity {
             if ("text/plain".equals(type)) {
                 handleUrl(intent.getStringExtra(Intent.EXTRA_TEXT));
             } else if (type.startsWith("image/")) {
-                handleStream(intent.getParcelableExtra(Intent.EXTRA_STREAM), type);
-            } else {
-                toBeFinished = true;
+                handleStream(intent.getParcelableExtra(Intent.EXTRA_STREAM));
             }
-        } else {
-            toBeFinished = true;
         }
     }
 
-    @Override
-    protected void onPause() {
-        super.onPause();
-        toBeFinished = true;
-    }
-
-    @Override
-    protected void onResume() {
-        super.onResume();
-
-        if (!toBeFinished) {
-            finish();
-        }
-    }
-
-    private String generateRandomString() {
-        int leftLimit = 97; // letter 'a'
-        int rightLimit = 122; // letter 'z'
-        int targetStringLength = 3;
-        Random random = new Random();
-        StringBuilder buffer = new StringBuilder(targetStringLength);
-        for (int i = 0; i < targetStringLength; i++) {
-            int randomLimitedInt = leftLimit + (int)
-                    (random.nextFloat() * (rightLimit - leftLimit + 1));
-            buffer.append((char) randomLimitedInt);
-        }
-        return buffer.toString();
-    }
-
     private void handleUrl(String textUrl) {
         URL url;
 
@@ -76,6 +41,7 @@ public class SetWallpaperActivity extends Activity {
             url = new URL(textUrl);
         } catch (MalformedURLException e) {
             Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
+            finish();
             return;
         }
 
@@ -86,47 +52,37 @@ public class SetWallpaperActivity extends Activity {
                 URLConnection connection = url.openConnection();
                 connection.connect();
                 InputStream inputStream = connection.getInputStream();
-                launchWallpaperActivity(writeImageToCache(inputStream), connection.getContentType());
+                launchWallpaperActivity(inputStream);
             } catch (IOException e) {
-                e.printStackTrace();
+                Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
+                finish();
             }
         });
     }
 
-    private void handleStream(Uri uri, String type) {
+    private void handleStream(Uri uri) {
         try {
             InputStream inputStream = getContentResolver().openInputStream(uri);
-            launchWallpaperActivity(writeImageToCache(inputStream), type);
+            launchWallpaperActivity(inputStream);
         } catch (IOException e) {
-            e.printStackTrace();
+            Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
+            finish();
         }
     }
 
-    private Uri writeImageToCache(InputStream inputStream) throws IOException {
-        File outputFile = File.createTempFile(generateRandomString(), generateRandomString(), getCacheDir());
-        OutputStream outputStream = new FileOutputStream(outputFile);
+    private void launchWallpaperActivity(InputStream stream) {
+        WallpaperManager manager = WallpaperManager.getInstance(getApplicationContext());
+        Bitmap bitmap = BitmapFactory.decodeStream(stream);
 
-        byte[] data = new byte[1024];
-        int count;
-
-        while ((count = inputStream.read(data)) != -1) {
-            outputStream.write(data, 0, count);
+        try {
+            manager.setBitmap(bitmap);
+        } catch (IOException e) {
+            Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
+            finish();
         }
 
-        outputStream.flush();
-        outputStream.close();
-        inputStream.close();
-
-        return FileProvider.getUriForFile(getApplicationContext(), getPackageName() + ".provider", outputFile);
-    }
-
-    private void launchWallpaperActivity(Uri uri, String mimeType) {
-        Intent intent = new Intent(Intent.ACTION_ATTACH_DATA);
-        intent.addCategory(Intent.CATEGORY_DEFAULT);
-        intent.setDataAndType(uri, mimeType);
-        intent.putExtra("mimeType", mimeType);
-        intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
-        startActivity(Intent.createChooser(intent, "Set as:"));
+        Toast.makeText(this, "Wallpaper set!", Toast.LENGTH_SHORT).show();
+        finish();
     }
 
 }

app/src/main/res/xml/file_paths.xml

@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<paths>
-    <cache-path name="cache" path="." />
-</paths>

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath "com.android.tools.build:gradle:4.2.2"
+        classpath 'com.android.tools.build:gradle:7.2.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files