use async avatar loading in AccountAdapter

1 files changed, 93 insertions, 1 deletions

diff --git a/src/main/java/de/pixart/messenger/ui/adapter/AccountAdapter.java b/src/main/java/de/pixart/messenger/ui/adapter/AccountAdapter.java
index f8eb6f4f0..a8bbedd67 100644
--- a/src/main/java/de/pixart/messenger/ui/adapter/AccountAdapter.java
+++ b/src/main/java/de/pixart/messenger/ui/adapter/AccountAdapter.java
@@ -1,6 +1,11 @@
 package de.pixart.messenger.ui.adapter;
 
 import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import android.os.AsyncTask;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -8,12 +13,15 @@ import android.widget.ArrayAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;
 
+import java.lang.ref.WeakReference;
 import java.util.List;
+import java.util.concurrent.RejectedExecutionException;
 
 import de.pixart.messenger.Config;
 import de.pixart.messenger.R;
 import de.pixart.messenger.entities.Account;
 import de.pixart.messenger.ui.XmppActivity;
+import de.pixart.messenger.utils.UIHelper;
 
 public class AccountAdapter extends ArrayAdapter<Account> {
 
@@ -40,7 +48,7 @@ public class AccountAdapter extends ArrayAdapter<Account> {
         }
         TextView statusView = (TextView) view.findViewById(R.id.account_status);
         ImageView imageView = (ImageView) view.findViewById(R.id.account_image);
-        imageView.setImageBitmap(activity.avatarService().get(account, activity.getPixel(56)));
+        loadAvatar(account,imageView);
         statusView.setText(getContext().getString(account.getStatus().getReadableId()));
         switch (account.getStatus()) {
             case ONLINE:
@@ -56,4 +64,88 @@ public class AccountAdapter extends ArrayAdapter<Account> {
         }
         return view;
     }
+
+    public static boolean cancelPotentialWork(Account account, ImageView imageView) {
+        final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
+
+        if (bitmapWorkerTask != null) {
+            final Account oldAccount = bitmapWorkerTask.account;
+            if (oldAccount == null || account != oldAccount) {
+                bitmapWorkerTask.cancel(true);
+            } else {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private static BitmapWorkerTask getBitmapWorkerTask(ImageView imageView) {
+        if (imageView != null) {
+            final Drawable drawable = imageView.getDrawable();
+            if (drawable instanceof AsyncDrawable) {
+                final AsyncDrawable asyncDrawable = (AsyncDrawable) drawable;
+                return asyncDrawable.getBitmapWorkerTask();
+            }
+        }
+        return null;
+    }
+
+    public void loadAvatar(Account account, ImageView imageView) {
+        if (cancelPotentialWork(account, imageView)) {
+            final Bitmap bm = activity.avatarService().get(account, activity.getPixel(56), true);
+            if (bm != null) {
+                cancelPotentialWork(account, imageView);
+                imageView.setImageBitmap(bm);
+                imageView.setBackgroundColor(0x00000000);
+            } else {
+                imageView.setBackgroundColor(UIHelper.getColorForName(account.getDisplayName()));
+                imageView.setImageDrawable(null);
+                final BitmapWorkerTask task = new BitmapWorkerTask(imageView);
+                final AsyncDrawable asyncDrawable = new AsyncDrawable(activity.getResources(), null, task);
+                imageView.setImageDrawable(asyncDrawable);
+                try {
+                    task.execute(account);
+                } catch (final RejectedExecutionException ignored) {
+                }
+            }
+        }
+    }
+
+    static class AsyncDrawable extends BitmapDrawable {
+        private final WeakReference<BitmapWorkerTask> bitmapWorkerTaskReference;
+
+        public AsyncDrawable(Resources res, Bitmap bitmap, BitmapWorkerTask bitmapWorkerTask) {
+            super(res, bitmap);
+            bitmapWorkerTaskReference = new WeakReference<>(bitmapWorkerTask);
+        }
+
+        public BitmapWorkerTask getBitmapWorkerTask() {
+            return bitmapWorkerTaskReference.get();
+        }
+    }
+
+    class BitmapWorkerTask extends AsyncTask<Account, Void, Bitmap> {
+        private final WeakReference<ImageView> imageViewReference;
+        private Account account = null;
+
+        public BitmapWorkerTask(ImageView imageView) {
+            imageViewReference = new WeakReference<>(imageView);
+        }
+
+        @Override
+        protected Bitmap doInBackground(Account... params) {
+            return activity.avatarService().get(params[0], activity.getPixel(56), isCancelled());
+        }
+
+        @Override
+        protected void onPostExecute(Bitmap bitmap) {
+            if (bitmap != null && !isCancelled()) {
+                final ImageView imageView = imageViewReference.get();
+                if (imageView != null) {
+                    imageView.setImageBitmap(bitmap);
+                    imageView.setBackgroundColor(0x00000000);
+                }
+            }
+        }
+    }
 }