Properly handle thread

app/build.gradle

@@ -11,8 +11,8 @@ android {
         minSdk 5
         //noinspection OldTargetApi
         targetSdkVersion 32
-        versionCode 8
-        versionName "3.1"
+        versionCode 9
+        versionName "3.2"
     }
 
     signingConfigs {

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

@@ -0,0 +1,39 @@
+package net.crystalyx.setaswallpaper;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.net.URLConnection;
+
+public class HttpThreadHandler implements Runnable {
+    private final URL url;
+    private Bitmap bitmap;
+    private String errorMessage;
+
+    public HttpThreadHandler(URL url) {
+        this.url = url;
+    }
+
+    @Override
+    public void run() {
+        try {
+            URLConnection connection = this.url.openConnection();
+            connection.connect();
+            InputStream inputStream = connection.getInputStream();
+            this.bitmap = BitmapFactory.decodeStream(inputStream);
+        } catch (IOException e) {
+            errorMessage = e.getMessage();
+        }
+    }
+
+    public Bitmap gitBitmap() {
+        return this.bitmap;
+    }
+
+    public String getErrorMessage() {
+        return this.errorMessage;
+    }
+}

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

@@ -12,9 +12,6 @@ import android.widget.Toast;
 import java.io.*;
 import java.net.MalformedURLException;
 import java.net.URL;
-import java.net.URLConnection;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
 
 public class SetWallpaperActivity extends Activity {
 
@@ -44,32 +41,37 @@ public class SetWallpaperActivity extends Activity {
             return;
         }
 
-        ExecutorService executor = Executors.newSingleThreadExecutor();
+        HttpThreadHandler handler = new HttpThreadHandler(url);
+        Thread job = new Thread(handler);
 
-        executor.execute(() -> {
-            try {
-                URLConnection connection = url.openConnection();
-                connection.connect();
-                InputStream inputStream = connection.getInputStream();
-                launchWallpaperActivity(inputStream);
-            } catch (IOException e) {
-                Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
-            }
-        });
+        job.start();
+        try {
+            job.join();
+        } catch (InterruptedException e) {
+            Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
+        }
+
+        Bitmap bitmap = handler.gitBitmap();
+        String errorMessage = handler.getErrorMessage();
+        if (bitmap != null) {
+            launchWallpaperActivity(bitmap);
+        } else if (errorMessage != null) {
+            Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT).show();
+        }
     }
 
     private void handleStream(Uri uri) {
         try {
             InputStream inputStream = getContentResolver().openInputStream(uri);
-            launchWallpaperActivity(inputStream);
+            Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
+            launchWallpaperActivity(bitmap);
         } catch (IOException e) {
             Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
         }
     }
 
-    private void launchWallpaperActivity(InputStream stream) {
+    private void launchWallpaperActivity(Bitmap bitmap) {
         WallpaperManager manager = WallpaperManager.getInstance(getApplicationContext());
-        Bitmap bitmap = BitmapFactory.decodeStream(stream);
 
         try {
             manager.setBitmap(bitmap);