allow setting Wallpaper with the app

app/src/main/AndroidManifest.xml

@@ -4,6 +4,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.SET_WALLPAPER"/>
 
     <application
         android:allowBackup="true"
@@ -30,6 +31,11 @@
                 <category android:name="android.intent.category.DEFAULT"/>
                 <data android:mimeType="vnd.android.cursor.dir/video"/>
             </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.SET_WALLPAPER"/>
+                <category android:name="android.intent.category.DEFAULT"/>
+            </intent-filter>
         </activity>
 
         <activity

app/src/main/java/com/simplemobiletools/gallery/Constants.java

@@ -5,4 +5,5 @@ public class Constants {
     public static final String MEDIUM = "medium";
     public static final String PICK_IMAGE_INTENT = "is_image_pick_intent";
     public static final String PICK_VIDEO_INTENT = "is_video_pick_intent";
+    public static final String SET_WALLPAPER_INTENT = "is_set_wallpaper_intent";
 }

app/src/main/java/com/simplemobiletools/gallery/activities/MainActivity.java

@@ -50,6 +50,7 @@ public class MainActivity extends AppCompatActivity
 
     private static final int STORAGE_PERMISSION = 1;
     private static final int PICK_MEDIA = 2;
+    private static final int PICK_WALLPAPER = 3;
 
     private static List<Directory> mDirs;
     private static Snackbar mSnackbar;
@@ -60,6 +61,7 @@ public class MainActivity extends AppCompatActivity
     private static boolean mIsSnackbarShown;
     private static boolean mIsPickImageIntent;
     private static boolean mIsPickVideoIntent;
+    private static boolean mIsSetWallpaperIntent;
     private static int mSelectedItemsCnt;
 
     @Override
@@ -67,12 +69,18 @@ public class MainActivity extends AppCompatActivity
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         ButterKnife.bind(this);
-        mIsPickImageIntent = isPickImageIntent(getIntent());
+
-        mIsPickVideoIntent = isPickVideoIntent(getIntent());
+        final Intent intent = getIntent();
+        mIsPickImageIntent = isPickImageIntent(intent);
+        mIsPickVideoIntent = isPickVideoIntent(intent);
+        mIsSetWallpaperIntent = isSetWallpaperIntent(intent);
     }
 
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
+        if (mIsSetWallpaperIntent)
+            return false;
+
         getMenuInflater().inflate(R.menu.menu, menu);
         return true;
     }
@@ -352,13 +360,22 @@ public class MainActivity extends AppCompatActivity
         return intent != null && intent.getAction() != null && intent.getAction().equals(Intent.ACTION_PICK) && intent.getData() != null;
     }
 
+    private boolean isSetWallpaperIntent(Intent intent) {
+        return intent != null && intent.getAction() != null && intent.getAction().equals(Intent.ACTION_SET_WALLPAPER);
+    }
+
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
-        if (requestCode == PICK_MEDIA && resultCode == RESULT_OK && data != null) {
+        if (resultCode == RESULT_OK) {
-            final Intent result = new Intent();
+            if (requestCode == PICK_MEDIA && data != null) {
-            result.setData(data.getData());
+                final Intent result = new Intent();
-            setResult(RESULT_OK, result);
+                result.setData(data.getData());
-            finish();
+                setResult(RESULT_OK, result);
+                finish();
+            } else if (requestCode == PICK_WALLPAPER) {
+                setResult(RESULT_OK);
+                finish();
+            }
         }
         super.onActivityResult(requestCode, resultCode, data);
     }
@@ -367,9 +384,15 @@ public class MainActivity extends AppCompatActivity
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
         final Intent intent = new Intent(this, MediaActivity.class);
         intent.putExtra(Constants.DIRECTORY, mDirs.get(position).getPath());
-        intent.putExtra(Constants.PICK_IMAGE_INTENT, mIsPickImageIntent);
+
-        intent.putExtra(Constants.PICK_VIDEO_INTENT, mIsPickVideoIntent);
+        if (mIsSetWallpaperIntent) {
-        startActivityForResult(intent, PICK_MEDIA);
+            intent.putExtra(Constants.SET_WALLPAPER_INTENT, true);
+            startActivityForResult(intent, PICK_WALLPAPER);
+        } else {
+            intent.putExtra(Constants.PICK_IMAGE_INTENT, mIsPickImageIntent);
+            intent.putExtra(Constants.PICK_VIDEO_INTENT, mIsPickVideoIntent);
+            startActivityForResult(intent, PICK_MEDIA);
+        }
     }
 
     @Override

app/src/main/java/com/simplemobiletools/gallery/activities/MediaActivity.java

@@ -1,8 +1,10 @@
 package com.simplemobiletools.gallery.activities;
 
+import android.app.WallpaperManager;
 import android.content.Intent;
 import android.content.res.Resources;
 import android.database.Cursor;
+import android.graphics.Bitmap;
 import android.graphics.Color;
 import android.media.MediaScannerConnection;
 import android.net.Uri;
@@ -12,6 +14,7 @@ import android.provider.MediaStore;
 import android.support.design.widget.CoordinatorLayout;
 import android.support.design.widget.Snackbar;
 import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
 import android.util.SparseBooleanArray;
 import android.view.ActionMode;
 import android.view.Menu;
@@ -22,6 +25,9 @@ import android.view.View;
 import android.widget.AdapterView;
 import android.widget.GridView;
 
+import com.bumptech.glide.Glide;
+import com.bumptech.glide.request.animation.GlideAnimation;
+import com.bumptech.glide.request.target.SimpleTarget;
 import com.simplemobiletools.gallery.Constants;
 import com.simplemobiletools.gallery.R;
 import com.simplemobiletools.gallery.Utils;
@@ -29,6 +35,7 @@ import com.simplemobiletools.gallery.adapters.MediaAdapter;
 import com.simplemobiletools.gallery.models.Medium;
 
 import java.io.File;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -39,6 +46,7 @@ import butterknife.ButterKnife;
 
 public class MediaActivity extends AppCompatActivity
         implements AdapterView.OnItemClickListener, GridView.MultiChoiceModeListener, GridView.OnTouchListener {
+    private static final String TAG = MediaActivity.class.getSimpleName();
     @BindView(R.id.media_grid) GridView mGridView;
 
     private static List<Medium> mMedia;
@@ -247,16 +255,44 @@ public class MediaActivity extends AppCompatActivity
         }
     }
 
+    private boolean isSetWallpaperIntent() {
+        return getIntent().getBooleanExtra(Constants.SET_WALLPAPER_INTENT, false);
+    }
+
     @Override
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
-        if (mIsPickImageIntent || mIsPickVideoIntent) {
+        final String curItemPath = mMedia.get(position).getPath();
+        if (isSetWallpaperIntent()) {
+            Utils.showToast(this, R.string.setting_wallpaper);
+
+            final int wantedWidth = getWallpaperDesiredMinimumWidth();
+            final int wantedHeight = getWallpaperDesiredMinimumHeight();
+            final float ratio = (float) wantedWidth / wantedHeight;
+            Glide.with(this)
+                    .load(new File(curItemPath))
+                    .asBitmap()
+                    .override((int) (wantedWidth * ratio), wantedHeight)
+                    .fitCenter()
+                    .into(new SimpleTarget<Bitmap>() {
+                        @Override
+                        public void onResourceReady(Bitmap bitmap, GlideAnimation anim) {
+                            try {
+                                WallpaperManager.getInstance(getApplicationContext()).setBitmap(bitmap);
+                                setResult(RESULT_OK);
+                            } catch (IOException e) {
+                                Log.e(TAG, "item click " + e.getMessage());
+                            }
+                            finish();
+                        }
+                    });
+        } else if (mIsPickImageIntent || mIsPickVideoIntent) {
             final Intent result = new Intent();
-            result.setData(Uri.parse(mMedia.get(position).getPath()));
+            result.setData(Uri.parse(curItemPath));
             setResult(RESULT_OK, result);
             finish();
         } else {
             final Intent intent = new Intent(this, ViewPagerActivity.class);
-            intent.putExtra(Constants.MEDIUM, mMedia.get(position).getPath());
+            intent.putExtra(Constants.MEDIUM, curItemPath);
             startActivity(intent);
         }
     }

app/src/main/res/values/strings.xml

@@ -17,6 +17,7 @@
     <string name="renaming_folder">Renaming folder</string>
     <string name="extension">Extension</string>
     <string name="file_deleted">File deleted</string>
+    <string name="setting_wallpaper">Setting wallpaper</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 folder deleted</item>