Use Glide to load media preview images

Closes #3344
// FREEBIE

src/org/thoughtcrime/securesms/components/ZoomingImageView.java

@@ -0,0 +1,45 @@
+package org.thoughtcrime.securesms.components;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.net.Uri;
+import android.util.AttributeSet;
+import android.widget.ImageView;
+
+import com.bumptech.glide.Glide;
+import com.bumptech.glide.request.target.BitmapImageViewTarget;
+
+import org.thoughtcrime.securesms.crypto.MasterSecret;
+import org.thoughtcrime.securesms.mms.DecryptableStreamUriLoader.DecryptableUri;
+
+import uk.co.senab.photoview.PhotoViewAttacher;
+
+public class ZoomingImageView extends ImageView {
+  private PhotoViewAttacher attacher = new PhotoViewAttacher(this);
+
+  public ZoomingImageView(Context context) {
+    super(context);
+  }
+
+  public ZoomingImageView(Context context, AttributeSet attrs) {
+    super(context, attrs);
+  }
+
+  public ZoomingImageView(Context context, AttributeSet attrs, int defStyleAttr) {
+    super(context, attrs, defStyleAttr);
+  }
+
+  public void setImageUri(MasterSecret masterSecret, Uri uri) {
+    Glide.with(getContext())
+         .load(new DecryptableUri(masterSecret, uri))
+         .asBitmap()
+         .dontTransform()
+         .dontAnimate()
+         .into(new BitmapImageViewTarget(this) {
+           @Override protected void setResource(Bitmap resource) {
+             super.setResource(resource);
+             attacher.update();
+           }
+         });
+  }
+}