* Async load of images on gallery with Universal Image Loader

Author: allgood

app/build.gradle

@@ -34,4 +34,5 @@ dependencies {
     compile 'com.github.ctodobom:OpenCV-3.1.0-Android:-SNAPSHOT'
     compile 'us.feras.mdv:markdownview:1.1.0'
     compile 'com.github.ctodobom:drag-select-recyclerview:0.3.4.ctodobom.sections'
+    compile 'com.github.nostra13:Android-Universal-Image-Loader:v1.9.5'
 }

app/src/main/java/com/todobom/opennotescanner/GalleryGridActivity.java

@@ -23,14 +23,15 @@
 
 import com.afollestad.dragselectrecyclerview.DragSelectRecyclerView;
 import com.afollestad.dragselectrecyclerview.DragSelectRecyclerViewAdapter;
+import com.nostra13.universalimageloader.core.ImageLoader;
+import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
+import com.nostra13.universalimageloader.core.assist.ImageSize;
 import com.todobom.opennotescanner.helpers.AboutFragment;
 import com.todobom.opennotescanner.helpers.Utils;
 
 import java.io.File;
 import java.util.ArrayList;
 
-import static com.todobom.opennotescanner.helpers.Utils.decodeSampledBitmapFromUri;
-
 
 public class GalleryGridActivity extends AppCompatActivity
         implements ClickListener, DragSelectRecyclerViewAdapter.SelectionListener {
@@ -41,6 +42,8 @@ public class GalleryGridActivity extends AppCompatActivity
     private DragSelectRecyclerView recyclerView;
     private AlertDialog.Builder deleteConfirmBuilder;
     private boolean selectionMode = false;
+    private ImageLoader mImageLoader;
+    private ImageSize mTargetSize;
 
     @Override
     public void onClick(int index) {
@@ -113,7 +116,15 @@ public void onBindViewHolder(ThumbViewHolder holder, int position) {
             String filename = itemList.get(position);
 
             if ( !filename.equals(holder.filename)) {
-                holder.image.setImageBitmap(decodeSampledBitmapFromUri(filename, 220, 220));
+
+                // remove previous image
+                holder.image.setImageBitmap(null);
+
+                // Load image, decode it to Bitmap and return Bitmap to callback
+                mImageLoader.displayImage("file:///"+filename, holder.image, mTargetSize);
+
+                // holder.image.setImageBitmap(decodeSampledBitmapFromUri(filename, 220, 220));
+
                 holder.filename = filename;
             }
 
@@ -189,7 +200,15 @@ public void onCreate(Bundle savedInstanceState) {
         actionBar.setDisplayHomeAsUpEnabled(true);
         actionBar.setHomeAsUpIndicator(R.drawable.ic_arrow_back_24dp);
 
-        myThumbAdapter = new ThumbAdapter(this,new Utils(getApplicationContext()).getFilePaths());
+        ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this).build();
+        mImageLoader = ImageLoader.getInstance();
+        mImageLoader.init(config);
+
+        mTargetSize = new ImageSize(220, 220); // result Bitmap will be fit to this size
+
+        ArrayList<String> ab = new ArrayList<>();
+        myThumbAdapter = new ThumbAdapter(this, ab );
+        // new Utils(getApplicationContext()).getFilePaths(););
 
         recyclerView = (DragSelectRecyclerView) findViewById(R.id.recyclerview);
         recyclerView.setLayoutManager(new GridLayoutManager(this, 3));
@@ -222,7 +241,8 @@ public void onClick(DialogInterface dialog, int which) {
     private void reloadAdapter() {
         recyclerView.setAdapter(null);
 
-        myThumbAdapter = new ThumbAdapter(this,new Utils(getApplicationContext()).getFilePaths());
+        // ArrayList<String> ab = new ArrayList<>();
+        myThumbAdapter = new ThumbAdapter(this, new Utils(getApplicationContext()).getFilePaths());
 
         recyclerView.setAdapter(myThumbAdapter);
         recyclerView.invalidate();
@@ -310,4 +330,6 @@ public void shareImages() {
         startActivity(Intent.createChooser(shareIntent, getString(R.string.share_snackbar)));
     }
 
+
+
 }