Fix NPE, add permission for external storage

app/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="de.trac.spherical">
 
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
@@ -23,6 +25,12 @@
                 <action android:name="android.intent.action.SEND" />
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
+
+            <intent-filter>
+                <data android:mimeType="image/*" />
+                <action android:name="android.intent.action.SEND" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
         </activity>
     </application>
 

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

@@ -72,7 +72,7 @@ public class MainActivity extends AppCompatActivity {
                     displayPhotoSphere(imageUri);
                     break;
 
-                case MIME_IMAGE:
+                default:
                     displayMaybePhotoSphere(imageUri);
                     break;
             }
@@ -92,12 +92,10 @@ public class MainActivity extends AppCompatActivity {
             String xml = SphereParser.getXMLContent(inputStream);
             PhotoSphereMetadata metadata = SphereParser.parse(xml);
 
-            inputStream = getContentResolver().openInputStream(uri);
-
-            if (metadata.isUsePanoramaViewer()) {
-                displayPhotoSphere(inputStream, metadata);
+            if (metadata == null || !metadata.isUsePanoramaViewer()) {
+                displayFlatImage(getContentResolver().openInputStream(uri));
             } else {
-                displayFlatImage(inputStream);
+                displayPhotoSphere(getContentResolver().openInputStream(uri), metadata);
             }
 
         } catch (FileNotFoundException e) {
@@ -117,6 +115,11 @@ public class MainActivity extends AppCompatActivity {
             String xml = SphereParser.getXMLContent(inputStream);
             PhotoSphereMetadata metadata = SphereParser.parse(xml);
 
+            if (metadata == null) {
+                Log.e(TAG, "Metadata is null. Fall back to flat image.");
+                displayFlatImage(getContentResolver().openInputStream(uri));
+            }
+
             displayPhotoSphere(getContentResolver().openInputStream(uri), metadata);
 
         } catch (FileNotFoundException e) {
@@ -130,6 +133,7 @@ public class MainActivity extends AppCompatActivity {
 
     private void displayPhotoSphere(InputStream inputStream, PhotoSphereMetadata metadata) {
         //Please fill me!
+        Log.d(TAG, "Display Photo Sphere!");
     }
 
     /**
@@ -137,6 +141,6 @@ public class MainActivity extends AppCompatActivity {
      * @param inputStream
      */
     private void displayFlatImage(InputStream inputStream) {
-
+        Log.d(TAG, "Display Flat Image!");
     }
 }

app/src/main/java/de/trac/spherical/parser/SphereParser.java

@@ -115,12 +115,15 @@ public class SphereParser {
 
         byte[] xml = new byte[xmlLen - 2];
         i = inputStream.read(xml);
-        throwIfUnexpectedEOF(i, r.length);
+        throwIfUnexpectedEOF(i, xml.length);
 
         return new String(xml);
     }
 
     public static PhotoSphereMetadata parse(String xmp) {
+        if (xmp == null) {
+            return null;
+        }
         PhotoSphereMetadata meta = new PhotoSphereMetadata();
         meta.setUsePanoramaViewer(parseBoolean(USE_PANORAMA_VIEWER, xmp, true));
         meta.setCaptureSoftware(parseString(CAPTURE_SOFTWARE, xmp));