Finish when browsed root goes away.

If we're browsing a specific root, and that root went away, typically
due to formatting.

Bug: 21831184
Change-Id: Ie07607a81e32a7d82c88ad382658a471d47b905d

1 files changed, 16 insertions, 1 deletions

diff --git a/packages/DocumentsUI/src/com/android/documentsui/BaseActivity.java b/packages/DocumentsUI/src/com/android/documentsui/BaseActivity.java
index bba33be..fc46716 100644
--- a/packages/DocumentsUI/src/com/android/documentsui/BaseActivity.java
+++ b/packages/DocumentsUI/src/com/android/documentsui/BaseActivity.java
@@ -25,7 +25,6 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.List;
 import java.util.concurrent.Executor;
 
@@ -97,6 +96,22 @@ abstract class BaseActivity extends Activity {
     }
 
     @Override
+    public void onResume() {
+        super.onResume();
+
+        final State state = getDisplayState();
+        final RootInfo root = getCurrentRoot();
+
+        // If we're browsing a specific root, and that root went away, then we
+        // have no reason to hang around
+        if (state.action == State.ACTION_BROWSE && root != null) {
+            if (mRoots.getRootBlocking(root.authority, root.rootId) == null) {
+                finish();
+            }
+        }
+    }
+
+    @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         boolean showMenu = super.onCreateOptionsMenu(menu);