Clean up batch saving.

- Post a better string for when batch saving completes successfully
- Exit multi-select after saving

res/values/strings.xml

@@ -701,6 +701,7 @@
 
     <!-- SaveAttachmentTask -->
     <string name="SaveAttachmentTask_saved_to">Saved to %s</string>
+    <string name="SaveAttachmentTask_saved">Saved</string>
 
     <!-- SearchToolbar -->
     <string name="SearchToolbar_search">Search</string>

src/org/thoughtcrime/securesms/MediaOverviewActivity.java

@@ -360,6 +360,7 @@ public class MediaOverviewActivity extends PassphraseRequiredActionBarActivity {
                                                                               attachments.size());
                          saveTask.executeOnExecutor(THREAD_POOL_EXECUTOR,
                                                     attachments.toArray(new SaveAttachmentTask.Attachment[attachments.size()]));
+                         exitMultiSelect();
                        }
                      }.execute();
                    })

src/org/thoughtcrime/securesms/util/SaveAttachmentTask.java

@@ -7,6 +7,7 @@ import android.net.Uri;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v7.app.AlertDialog;
+import android.text.TextUtils;
 import android.webkit.MimeTypeMap;
 import android.widget.Toast;
 
@@ -188,10 +189,9 @@ public class SaveAttachmentTask extends ProgressDialogAsyncTask<SaveAttachmentTa
                        Toast.LENGTH_LONG).show();
         break;
       case SUCCESS:
-        Toast.makeText(context,
-                       context.getResources().getString(R.string.SaveAttachmentTask_saved_to,
-                                                        result.second()),
-                       Toast.LENGTH_LONG).show();
+        String message = !TextUtils.isEmpty(result.second())  ? context.getResources().getString(R.string.SaveAttachmentTask_saved_to, result.second())
+                                                              : context.getResources().getString(R.string.SaveAttachmentTask_saved);
+        Toast.makeText(context, message, Toast.LENGTH_LONG).show();
         break;
       case WRITE_ACCESS_FAILURE:
         Toast.makeText(context, R.string.ConversationFragment_unable_to_write_to_sd_card_exclamation,