Add support for asset URIs

UrlImageViewHelper/src/com/koushikdutta/urlimageviewhelper/AssetUrlDownloader.java

@@ -0,0 +1,46 @@
+
+package com.koushikdutta.urlimageviewhelper;
+
+import java.io.InputStream;
+
+import android.content.Context;
+import android.os.AsyncTask;
+
+public class AssetUrlDownloader implements UrlDownloader {
+    @Override
+    public void download(final Context context, final String url, final String filename,
+            final UrlDownloaderCallback callback, final Runnable completion) {
+        final AsyncTask<Void, Void, Void> downloader = new AsyncTask<Void, Void, Void>() {
+            @Override
+            protected Void doInBackground(final Void... params) {
+                try {
+                    String relativePath = url.replaceFirst("file:///android_asset/", "");
+                    InputStream is = context.getAssets().open(relativePath);
+                    callback.onDownloadComplete(AssetUrlDownloader.this, is, null);
+                    return null;
+                }
+                catch (final Throwable e) {
+                    e.printStackTrace();
+                    return null;
+                }
+            }
+
+            @Override
+            protected void onPostExecute(final Void result) {
+                completion.run();
+            }
+        };
+
+        UrlImageViewHelper.executeTask(downloader);
+    }
+
+    @Override
+    public boolean allowCache() {
+        return false;
+    }
+
+    @Override
+    public boolean canDownloadUrl(String url) {
+        return url.startsWith("file:///android_asset/");
+    }
+}

UrlImageViewHelper/src/com/koushikdutta/urlimageviewhelper/UrlImageViewHelper.java

@@ -681,6 +681,7 @@ private static abstract class Loader implements UrlDownloader.UrlDownloaderCallb
     private static HttpUrlDownloader mHttpDownloader = new HttpUrlDownloader();
     private static ContentUrlDownloader mContentDownloader = new ContentUrlDownloader();
     private static ContactContentUrlDownloader mContactDownloader = new ContactContentUrlDownloader();
+    private static AssetUrlDownloader mAssetDownloader = new AssetUrlDownloader();
     private static FileUrlDownloader mFileDownloader = new FileUrlDownloader();
     private static ArrayList<UrlDownloader> mDownloaders = new ArrayList<UrlDownloader>();
     public static ArrayList<UrlDownloader> getDownloaders() {
@@ -691,6 +692,7 @@ public static ArrayList<UrlDownloader> getDownloaders() {
         mDownloaders.add(mHttpDownloader);
         mDownloaders.add(mContactDownloader);
         mDownloaders.add(mContentDownloader);
+        mDownloaders.add(mAssetDownloader);
         mDownloaders.add(mFileDownloader);
     }