Use Butterknife, properly display progressFragment

app/src/main/java/de/trac/spherical/util/LoadImageTask.java

@@ -0,0 +1,76 @@
+package de.trac.spherical.util;
+
+import android.content.ContentResolver;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.net.Uri;
+import android.os.AsyncTask;
+
+import java.io.IOException;
+
+import de.trac.spherical.parser.PhotoSphereMetadata;
+import de.trac.spherical.parser.PhotoSphereParser;
+
+/**
+ * Dedicated async tasks to load an image.
+ * Takes a progress reporter and informs it about the changes.
+ */
+public class LoadImageTask extends AsyncTask<Void, Void, LoadImageTask.Result> {
+
+    private ContentResolver contentResolver;
+    private Uri uri;
+
+    private Bitmap bitmap;
+    private PhotoSphereMetadata metadata;
+    private final String type;
+    private final FinishedCallback callback;
+
+    public LoadImageTask(ContentResolver contentResolver, Uri uri, String type, FinishedCallback callback) {
+        this.callback = callback;
+        this.contentResolver = contentResolver;
+        this.uri = uri;
+        this.type = type;
+    }
+
+    @Override
+    protected Result doInBackground(Void... params) {
+
+        try {
+            bitmap = BitmapFactory.decodeStream(contentResolver.openInputStream(uri));
+            metadata = PhotoSphereParser.parse(contentResolver.openInputStream(uri));
+            return new Result(bitmap, metadata);
+        } catch (IOException | OutOfMemoryError e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    @Override
+    protected void onPostExecute(Result result) {
+        callback.onImageLoadingFinished(result);
+    }
+
+    public interface FinishedCallback {
+        void onImageLoadingFinished(Result result);
+    }
+
+    public static class Result {
+
+        private Bitmap bitmap;
+        private PhotoSphereMetadata metadata;
+
+        public Result(Bitmap bitmap, PhotoSphereMetadata metadata) {
+            this.bitmap = bitmap;
+            this.metadata = metadata;
+        }
+
+        public Bitmap getBitmap() {
+            return bitmap;
+        }
+
+        public PhotoSphereMetadata getMetadata() {
+            return metadata;
+        }
+    }
+}