Merge pull request #31 from tvbarthel/vb/fix-orientation-query

[Sample] Fix query orientation.

sample/src/main/AndroidManifest.xml

@@ -17,7 +17,7 @@
 
         <!-- provider used to expose image through sharing intent!-->
         <provider
-            android:name="android.support.v4.content.FileProvider"
+            android:name=".SharingFileProvider"
             android:authorities="fr.tvbarthel.intentsharesample.fileprovider"
             android:exported="false"
             android:grantUriPermissions="true">

sample/src/main/java/fr/tvbarthel/intentsharesample/SharingFileProvider.java

@@ -0,0 +1,58 @@
+package fr.tvbarthel.intentsharesample;
+
+import android.database.Cursor;
+import android.database.MatrixCursor;
+import android.net.Uri;
+import android.provider.MediaStore;
+import android.support.v4.content.FileProvider;
+
+/**
+ * A simple {@link FileProvider} that solves a bug with the com.android.mms application.
+ * <p/>
+ * http://androidxref.com/5.1.1_r6/xref/packages/apps/Mms/src/com/android/mms/ui/UriImage.java#546
+ * <p/>
+ * <p/>
+ * When sharing an images with a content Uri, the com.android.mms application
+ * tries to get the orientation of the image from the provider.
+ * <p/>
+ * This {@link FileProvider} is a very simple example that handle the query of {@link android.provider.MediaStore.Images.ImageColumns#ORIENTATION}
+ * projection.
+ * <p/>
+ * <b>Note:</b> this {@link FileProvider} always returns '0' for the value of the orientation.
+ * If your images do not have the same orientation, you should build your own logic.
+ */
+public class SharingFileProvider extends FileProvider {
+
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
+        if (isMediaStoreOrientationProjection(projection)) {
+            return queryMediaStoreOrientation();
+        }
+
+        return super.query(uri, projection, selection, selectionArgs, sortOrder);
+    }
+
+    /**
+     * Check if a projection corresponds to a {@link android.provider.MediaStore.Images.ImageColumns#ORIENTATION} projection.
+     *
+     * @param projection the projection to check.
+     * @return Returns true is the given projection corresponds to {@link android.provider.MediaStore.Images.ImageColumns#ORIENTATION}, false otherwise.
+     */
+    private boolean isMediaStoreOrientationProjection(String[] projection) {
+        return projection != null && projection.length == 1 && MediaStore.Images.ImageColumns.ORIENTATION.equals(projection[0]);
+    }
+
+    /**
+     * Query the {@link android.provider.MediaStore.Images.ImageColumns#ORIENTATION}
+     *
+     * @return Returns a {@link Cursor} with {@link android.provider.MediaStore.Images.ImageColumns#ORIENTATION} set to 0.
+     */
+    private Cursor queryMediaStoreOrientation() {
+        String[] cols = new String[]{MediaStore.Images.ImageColumns.ORIENTATION};
+        Object[] values = new Object[]{0};
+
+        final MatrixCursor cursor = new MatrixCursor(cols, 1);
+        cursor.addRow(values);
+        return cursor;
+    }
+}