Add image download by url

app/build.gradle

@@ -8,7 +8,7 @@ android {
 
     defaultConfig {
         applicationId "net.crystalyx.setaswallpaper"
-        minSdkVersion 4
+        minSdkVersion 14
         targetSdkVersion 30
         versionCode 1
         versionName "1.0"
@@ -27,4 +27,5 @@ android {
 }
 
 dependencies {
-}
+    implementation "androidx.core:core:1.6.0"
+}

app/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="net.crystalyx.setaswallpaper">
 
+    <uses-permission android:name="android.permission.INTERNET"/>
+
     <application
             android:allowBackup="false"
             android:label="Set as wallpaper"
@@ -15,7 +17,20 @@
                 <category android:name="android.intent.category.DEFAULT"/>
                 <data android:mimeType="image/*"/>
             </intent-filter>
+            <intent-filter>
+                <action android:name="android.intent.action.SEND"/>
+                <category android:name="android.intent.category.DEFAULT"/>
+                <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

@@ -4,6 +4,16 @@ import android.app.Activity;
 import android.content.Intent;
 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 {
 
@@ -12,11 +22,71 @@ public class SetWallpaperActivity extends Activity {
         super.onCreate(savedInstanceState);
 
         Intent intent = getIntent();
-        if (Intent.ACTION_SEND.equals(intent.getAction())) {
-            launchWallpaperActivity(intent.getParcelableExtra(Intent.EXTRA_STREAM), intent.getType());
+        String type = intent.getType();
+
+        if (Intent.ACTION_SEND.equals(intent.getAction()) && type != null) {
+            if ("text/plain".equals(type)) {
+                handleUrl(intent.getStringExtra(Intent.EXTRA_TEXT));
+            } else if (type.startsWith("image/")) {
+                launchWallpaperActivity(intent.getParcelableExtra(Intent.EXTRA_STREAM), type);
+            }
         }
     }
 
+    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;
+
+        try {
+            url = new URL(textUrl);
+        } catch (MalformedURLException e) {
+            Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        ExecutorService executor = Executors.newSingleThreadExecutor();
+
+        executor.execute(() -> {
+            try {
+                File outputFile = File.createTempFile(generateRandomString(), generateRandomString(), getCacheDir());
+                URLConnection connection = url.openConnection();
+                connection.connect();
+
+                InputStream inputStream = connection.getInputStream();
+                OutputStream outputStream = new FileOutputStream(outputFile);
+
+                byte[] data = new byte[1024];
+                int count;
+
+                while ((count = inputStream.read(data)) != -1) {
+                    outputStream.write(data, 0, count);
+                }
+
+                outputStream.flush();
+                outputStream.close();
+                inputStream.close();
+
+                Uri uri = FileProvider.getUriForFile(getApplicationContext(), getPackageName() + ".provider", outputFile);
+                launchWallpaperActivity(uri, connection.getContentType());
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        });
+    }
+
     private void launchWallpaperActivity(Uri uri, String mimeType) {
         Intent intent = new Intent(Intent.ACTION_ATTACH_DATA);
         intent.addCategory(Intent.CATEGORY_DEFAULT);

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

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