Load images in AsyncTask. Fixes #10.

app/src/main/java/de/trac/spherical/HandleImageTask.java

@@ -0,0 +1,23 @@
+package de.trac.spherical;
+
+import android.content.Intent;
+import android.os.AsyncTask;
+
+/**
+ * Created by vanitas on 15.09.17.
+ */
+
+public class HandleImageTask extends AsyncTask<Intent, Void, Void> {
+
+    private MainActivity mainActivity;
+
+    public HandleImageTask(MainActivity mainActivity) {
+        this.mainActivity = mainActivity;
+    }
+
+    @Override
+    protected Void doInBackground(Intent... params) {
+        mainActivity.handleSentImageIntent(params[0]);
+        return null;
+    }
+}

app/src/main/java/de/trac/spherical/MainActivity.java

@@ -119,7 +119,7 @@ public class MainActivity extends AppCompatActivity {
     private void checkPermissionAndHandleSentImage(Intent intent) {
         int status = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);
         if (status == PackageManager.PERMISSION_GRANTED) {
-            handleSentImageIntent(intent);
+            new HandleImageTask(this).doInBackground(intent);
         }
 
         // Cache intent and request permission
@@ -137,7 +137,7 @@ public class MainActivity extends AppCompatActivity {
                 // If request is cancelled, the result arrays are empty.
                 if (grantResults.length > 0
                         && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                    handleSentImageIntent(cachedIntent);
+                    new HandleImageTask(this).doInBackground(cachedIntent);
                 } else {
                     Toast.makeText(this, R.string.toast_missing_permission, Toast.LENGTH_LONG).show();
                 }
@@ -184,7 +184,7 @@ public class MainActivity extends AppCompatActivity {
      * displayed, while images with MIME type image/* are being manually tested using {@link PhotoSphereParser}.
      * @param intent incoming intent.
      */
-    private void handleSentImageIntent(Intent intent) {
+    void handleSentImageIntent(Intent intent) {
         String type = intent.getType();
         if (type != null) {