Merge "Fix contents overlap to top bar"
diff --git a/TEST_MAPPING b/TEST_MAPPING
new file mode 100644
index 0000000..98c2fc8
--- /dev/null
+++ b/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "postsubmit": [
+    {
+      "name": "DocumentsUIGoogleTests"
+    }
+  ]
+}
diff --git a/perf-tests/Android.bp b/perf-tests/Android.bp
index 963a6da..e745fdf 100644
--- a/perf-tests/Android.bp
+++ b/perf-tests/Android.bp
@@ -20,6 +20,7 @@
 
     static_libs: [
         "androidx.legacy_legacy-support-v4",
+        "androidx.test.rules",
         "androidx.test.espresso.core",
         "mockito-target",
         "ub-janktesthelper",
diff --git a/res/drawable/ic_root_bugreport.xml b/res/drawable/ic_root_bugreport.xml
new file mode 100644
index 0000000..bc6fc3a
--- /dev/null
+++ b/res/drawable/ic_root_bugreport.xml
@@ -0,0 +1,25 @@
+<!--
+  ~ Copyright (C) 2019 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#5F6368"
+        android:pathData="M20 10V8h-2.81c-.45-.78-1.07-1.46-1.82-1.96L17 4.41 15.59 3l-2.17 2.17c-.03-.01-.05-.01-.08-.01-.16-.04-.32-.06-.49-.09l-.17-.03C12.46 5.02 12.23 5 12 5c-.49 0-.97.07-1.42.18l.02-.01L8.41 3 7 4.41l1.62 1.63h.01c-.75.5-1.37 1.18-1.82 1.96H4v2h2.09c-.06.33-.09.66-.09 1v1H4v2h2v1c0 .34.04.67.09 1H4v2h2.81c1.04 1.79 2.97 3 5.19 3s4.15-1.21 5.19-3H20v-2h-2.09c.05-.33.09-.66.09-1v-1h2v-2h-2v-1c0-.34-.04-.67-.09-1H20zm-4 5c0 2.21-1.79 4-4 4s-4-1.79-4-4v-4c0-2.21 1.79-4 4-4s4 1.79 4 4v4zm-6-1h4v2h-4zm0-4h4v2h-4z" />
+</vector>
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 10f9b05..2409ed6 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -91,8 +91,14 @@
         <item name="buttonBarNegativeButtonStyle">@style/DialogTextButton</item>
     </style>
 
+    <style name="MaterialAlertDialogStyle" parent="@style/MaterialAlertDialog.MaterialComponents">
+        <item name="backgroundInsetTop">12dp</item>
+        <item name="backgroundInsetBottom">12dp</item>
+    </style>
+
     <style name="MaterialAlertDialogTheme" parent="@style/ThemeOverlay.MaterialComponents.MaterialAlertDialog.Centered">
         <item name="android:dialogCornerRadius">@dimen/grid_item_radius</item>
+        <item name="alertDialogStyle">@style/MaterialAlertDialogStyle</item>
         <item name="buttonBarPositiveButtonStyle">@style/DialogTextButton</item>
         <item name="buttonBarNegativeButtonStyle">@style/DialogTextButton</item>
         <item name="materialAlertDialogTitleTextStyle">@style/MaterialAlertDialogTitleStyle</item>
diff --git a/src/com/android/documentsui/AbstractActionHandler.java b/src/com/android/documentsui/AbstractActionHandler.java
index 94b4d42..803aae5 100644
--- a/src/com/android/documentsui/AbstractActionHandler.java
+++ b/src/com/android/documentsui/AbstractActionHandler.java
@@ -594,11 +594,15 @@
             Context context = mActivity;
 
             if (mState.stack.isRecents()) {
+                final LockingContentObserver observer = new LockingContentObserver(
+                        mContentLock, AbstractActionHandler.this::loadDocumentsForCurrentStack);
+                MultiRootDocumentsLoader loader;
+
                 if (mSearchMgr.isSearching()) {
                     if (DEBUG) {
                         Log.d(TAG, "Creating new GlobalSearchLoader.");
                     }
-                    return new GlobalSearchLoader(
+                    loader = new GlobalSearchLoader(
                             context,
                             mProviders,
                             mState,
@@ -609,13 +613,15 @@
                     if (DEBUG) {
                         Log.d(TAG, "Creating new loader recents.");
                     }
-                    return new RecentsLoader(
+                    loader =  new RecentsLoader(
                             context,
                             mProviders,
                             mState,
                             mExecutors,
                             mInjector.fileTypeLookup);
                 }
+                loader.setObserver(observer);
+                return loader;
             } else {
                 Uri contentsUri = mSearchMgr.isSearching()
                         ? DocumentsContract.buildSearchDocumentsUri(
diff --git a/src/com/android/documentsui/CreateDirectoryFragment.java b/src/com/android/documentsui/CreateDirectoryFragment.java
index 8828d65..0d4aa4f 100644
--- a/src/com/android/documentsui/CreateDirectoryFragment.java
+++ b/src/com/android/documentsui/CreateDirectoryFragment.java
@@ -68,7 +68,6 @@
     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
         final Context context = getActivity();
-        final ContentResolver resolver = context.getContentResolver();
 
         final MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(context);
         final LayoutInflater dialogInflater = LayoutInflater.from(builder.getContext());
diff --git a/src/com/android/documentsui/DirectoryLoader.java b/src/com/android/documentsui/DirectoryLoader.java
index d65b4c3..63c3bf6 100644
--- a/src/com/android/documentsui/DirectoryLoader.java
+++ b/src/com/android/documentsui/DirectoryLoader.java
@@ -16,20 +16,16 @@
 
 package com.android.documentsui;
 
-import static com.android.documentsui.base.SharedMinimal.DEBUG;
 import static com.android.documentsui.base.SharedMinimal.VERBOSE;
 
 import android.content.ContentProviderClient;
 import android.content.ContentResolver;
 import android.content.Context;
-import android.database.ContentObserver;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.CancellationSignal;
 import android.os.FileUtils;
-import android.os.Handler;
-import android.os.Looper;
 import android.os.OperationCanceledException;
 import android.os.RemoteException;
 import android.provider.DocumentsContract.Document;
@@ -241,28 +237,4 @@
 
         getContext().getContentResolver().unregisterContentObserver(mObserver);
     }
-
-    private static final class LockingContentObserver extends ContentObserver {
-        private final ContentLock mLock;
-        private final Runnable mContentChangedCallback;
-
-        public LockingContentObserver(ContentLock lock, Runnable contentChangedCallback) {
-            super(new Handler(Looper.getMainLooper()));
-            mLock = lock;
-            mContentChangedCallback = contentChangedCallback;
-        }
-
-        @Override
-        public boolean deliverSelfNotifications() {
-            return true;
-        }
-
-        @Override
-        public void onChange(boolean selfChange) {
-            if (DEBUG) {
-                Log.d(TAG, "Directory content updated.");
-            }
-            mLock.runWhenUnlocked(mContentChangedCallback);
-        }
-    }
 }
diff --git a/src/com/android/documentsui/LockingContentObserver.java b/src/com/android/documentsui/LockingContentObserver.java
new file mode 100644
index 0000000..bbd7a98
--- /dev/null
+++ b/src/com/android/documentsui/LockingContentObserver.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.documentsui;
+
+import static com.android.documentsui.base.SharedMinimal.DEBUG;
+import static com.android.documentsui.base.SharedMinimal.TAG;
+
+import android.database.ContentObserver;
+import android.os.Handler;
+import android.os.Looper;
+import android.util.Log;
+
+/**
+ * A custom {@link ContentObserver} which constructed by a {@link ContentLock}
+ * and a {@link Runnable} callback. It will callback when it's onChange and ContentLock is unlock.
+ */
+public final class LockingContentObserver extends ContentObserver {
+    private final ContentLock mLock;
+    private final Runnable mContentChangedCallback;
+
+    public LockingContentObserver(ContentLock lock, Runnable contentChangedCallback) {
+        super(new Handler(Looper.getMainLooper()));
+        mLock = lock;
+        mContentChangedCallback = contentChangedCallback;
+    }
+
+    @Override
+    public boolean deliverSelfNotifications() {
+        return true;
+    }
+
+    @Override
+    public void onChange(boolean selfChange) {
+        if (DEBUG) {
+            Log.d(TAG, "Content updated.");
+        }
+        mLock.runWhenUnlocked(mContentChangedCallback);
+    }
+}
diff --git a/src/com/android/documentsui/MultiRootDocumentsLoader.java b/src/com/android/documentsui/MultiRootDocumentsLoader.java
index 777efe0..11208c1 100644
--- a/src/com/android/documentsui/MultiRootDocumentsLoader.java
+++ b/src/com/android/documentsui/MultiRootDocumentsLoader.java
@@ -17,7 +17,6 @@
 package com.android.documentsui;
 
 import static com.android.documentsui.base.SharedMinimal.DEBUG;
-import static com.android.documentsui.base.SharedMinimal.TAG;
 
 import android.app.ActivityManager;
 import android.content.ContentProviderClient;
@@ -65,6 +64,9 @@
  * and return the combined result.
  */
 public abstract class MultiRootDocumentsLoader extends AsyncTaskLoader<DirectoryResult> {
+
+    private static final String TAG = "MultiRootDocsLoader";
+
     // TODO: clean up cursor ownership so background thread doesn't traverse
     // previously returned cursors for filtering/sorting; this currently races
     // with the UI thread.
@@ -83,6 +85,7 @@
     private final ProvidersAccess mProviders;
     private final Lookup<String, Executor> mExecutors;
     private final Lookup<String, String> mFileTypeMap;
+    private LockingContentObserver mObserver;
 
     @GuardedBy("mTasks")
     /** A authority -> QueryTask map */
@@ -101,6 +104,8 @@
      * @param state current state
      * @param executors the executors of authorities
      * @param fileTypeMap the map of mime types and file types.
+     * @param lock the selection lock
+     * @param contentChangedCallback callback when content changed
      */
     public MultiRootDocumentsLoader(Context context, ProvidersAccess providers, State state,
             Lookup<String, Executor> executors, Lookup<String, String> fileTypeMap) {
@@ -126,6 +131,10 @@
         }
     }
 
+    public void setObserver(LockingContentObserver observer) {
+        mObserver = observer;
+    }
+
     private DirectoryResult loadInBackgroundLocked() {
         if (mFirstPassLatch == null) {
             // First time through we kick off all the recent tasks, and wait
@@ -322,6 +331,10 @@
 
         FileUtils.closeQuietly(mResult);
         mResult = null;
+
+        if (mObserver != null) {
+            getContext().getContentResolver().unregisterContentObserver(mObserver);
+        }
     }
 
     // TODO: create better transfer of ownership around cursor to ensure its
@@ -406,6 +419,9 @@
                         mState.sortModel.addQuerySortArgs(queryArgs);
                         addQueryArgs(queryArgs);
                         res[i] = client.query(uri, null, queryArgs, null);
+                        if (mObserver != null) {
+                            res[i].registerContentObserver(mObserver);
+                        }
                         mCursors[i] = generateResultCursor(rootInfos.get(i), res[i]);
                     } catch (Exception e) {
                         Log.w(TAG, "Failed to load " + authority + ", " + rootInfos.get(i).rootId,
diff --git a/src/com/android/documentsui/base/Providers.java b/src/com/android/documentsui/base/Providers.java
index 586440c..1729d2e 100644
--- a/src/com/android/documentsui/base/Providers.java
+++ b/src/com/android/documentsui/base/Providers.java
@@ -41,6 +41,7 @@
     public static final String ROOT_ID_AUDIO = "audio_root";
 
     public static final String AUTHORITY_MTP = "com.android.mtp.documents";
+    public static final String AUTHORITY_BUGREPORT = "com.android.shell.documents";
 
     private static final String DOCSUI_PACKAGE = "com.android.documentsui";
     private static final Set<String> SYSTEM_AUTHORITIES = new HashSet<String>() {{
diff --git a/src/com/android/documentsui/base/RootInfo.java b/src/com/android/documentsui/base/RootInfo.java
index dd82077..e69c0f8 100644
--- a/src/com/android/documentsui/base/RootInfo.java
+++ b/src/com/android/documentsui/base/RootInfo.java
@@ -21,10 +21,8 @@
 import static com.android.documentsui.base.DocumentInfo.getCursorInt;
 import static com.android.documentsui.base.DocumentInfo.getCursorLong;
 import static com.android.documentsui.base.DocumentInfo.getCursorString;
-import static com.android.documentsui.base.SharedMinimal.VERBOSE;
 import static com.android.documentsui.base.Shared.compareToIgnoreCaseNullable;
-
-import androidx.annotation.IntDef;
+import static com.android.documentsui.base.SharedMinimal.VERBOSE;
 
 import android.content.Context;
 import android.database.Cursor;
@@ -37,6 +35,8 @@
 import android.text.TextUtils;
 import android.util.Log;
 
+import androidx.annotation.IntDef;
+
 import com.android.documentsui.IconUtils;
 import com.android.documentsui.R;
 
@@ -237,6 +237,9 @@
             derivedIcon = LOAD_FROM_CONTENT_RESOLVER;
         } else if (isRecents()) {
             derivedType = TYPE_RECENTS;
+        } else if (isBugReport()) {
+            derivedType = TYPE_OTHER;
+            derivedIcon = R.drawable.ic_root_bugreport;
         } else {
             derivedType = TYPE_OTHER;
         }
@@ -248,6 +251,10 @@
         return DocumentsContract.buildRootUri(authority, rootId);
     }
 
+    public boolean isBugReport() {
+        return Providers.AUTHORITY_BUGREPORT.equals(authority);
+    }
+
     public boolean isRecents() {
         return authority == null && rootId == null;
     }
diff --git a/src/com/android/documentsui/dirlist/RenameDocumentFragment.java b/src/com/android/documentsui/dirlist/RenameDocumentFragment.java
index 8fae42e..0a25395 100644
--- a/src/com/android/documentsui/dirlist/RenameDocumentFragment.java
+++ b/src/com/android/documentsui/dirlist/RenameDocumentFragment.java
@@ -170,7 +170,7 @@
      */
     private void selectFileName(EditText editText) {
         String text = editText.getText().toString();
-        int separatorIndex = text.indexOf(".");
+        int separatorIndex = text.lastIndexOf(".");
         editText.setSelection(0,
                 (separatorIndex == -1 || mDocument.isDirectory()) ? text.length() : separatorIndex);
     }
diff --git a/tests/common/com/android/documentsui/DialogFragmentTest.java b/tests/common/com/android/documentsui/DialogFragmentTest.java
new file mode 100644
index 0000000..05ad5fb
--- /dev/null
+++ b/tests/common/com/android/documentsui/DialogFragmentTest.java
@@ -0,0 +1,320 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.documentsui;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import android.app.Activity;
+import android.app.Instrumentation;
+import android.app.UiAutomation;
+import android.content.Intent;
+import android.content.pm.ActivityInfo;
+import android.graphics.Paint;
+import android.os.Build;
+import android.os.ParcelFileDescriptor;
+
+import androidx.fragment.app.FragmentManager;
+import androidx.test.filters.MediumTest;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.rule.ActivityTestRule;
+import androidx.test.runner.AndroidJUnit4;
+
+import com.android.documentsui.files.FilesActivity;
+
+import com.google.android.material.textfield.TextInputEditText;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+
+@MediumTest
+@RunWith(AndroidJUnit4.class)
+public class DialogFragmentTest {
+
+    private static final String CREATE_FRAGEMENT_TAG = "create_directory";
+    CreateDirectoryFragment mCreateDirectoryFragment;
+    FragmentManager mFragmentManager;
+    ScreenDensitySession mScreenDensitySession;
+    Intent mFileActivityIntent;
+
+    @Rule
+    public ActivityTestRule<FilesActivity> mActivityTestRule = new ActivityTestRule<>(
+            FilesActivity.class);
+
+    @Before
+    public void setup() {
+        mFileActivityIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
+        mFragmentManager = mActivityTestRule.getActivity().getSupportFragmentManager();
+        mScreenDensitySession = new ScreenDensitySession();
+    }
+
+    @After
+    public void tearDown() {
+        mScreenDensitySession.close();
+        mCreateDirectoryFragment = null;
+    }
+
+    @Test
+    public void testCreateDialogShows() throws Throwable {
+        mActivityTestRule.runOnUiThread(() -> CreateDirectoryFragment.show(mFragmentManager));
+        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
+        mCreateDirectoryFragment =
+                (CreateDirectoryFragment) mFragmentManager.findFragmentByTag(CREATE_FRAGEMENT_TAG);
+
+        assertNotNull("Dialog was null", mCreateDirectoryFragment.getDialog());
+        assertTrue("Dialog was not being shown", mCreateDirectoryFragment.getDialog().isShowing());
+    }
+
+    @Test
+    public void testCreateDialogShowsDismiss() throws Throwable {
+        mActivityTestRule.runOnUiThread(() -> CreateDirectoryFragment.show(mFragmentManager));
+        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
+        mCreateDirectoryFragment =
+                (CreateDirectoryFragment) mFragmentManager.findFragmentByTag(CREATE_FRAGEMENT_TAG);
+
+        assertNotNull("Dialog was null", mCreateDirectoryFragment.getDialog());
+        assertTrue("Dialog was not being shown", mCreateDirectoryFragment.getDialog().isShowing());
+
+        mActivityTestRule.runOnUiThread(() -> mCreateDirectoryFragment.dismiss());
+        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
+
+        assertNull("Dialog should be null after dismiss()", mCreateDirectoryFragment.getDialog());
+    }
+
+    @Test
+    public void testCreateDialogShows_textInputEditText_shouldNotTruncateOnPortrait()
+            throws Throwable {
+        mActivityTestRule.runOnUiThread(() -> CreateDirectoryFragment.show(mFragmentManager));
+        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
+        mCreateDirectoryFragment =
+                (CreateDirectoryFragment) mFragmentManager.findFragmentByTag(CREATE_FRAGEMENT_TAG);
+
+        final TextInputEditText inputView =
+                mCreateDirectoryFragment.getDialog().findViewById(android.R.id.text1);
+
+        assertTrue(inputView.getHeight() > getInputTextHeight(inputView));
+    }
+
+    @Test
+    public void testCreateDialog_textInputEditText_shouldNotTruncateOnLargeDensity()
+            throws Throwable {
+
+        mScreenDensitySession.setLargeDensity();
+        mActivityTestRule.finishActivity();
+        mActivityTestRule.launchActivity(mFileActivityIntent);
+        mFragmentManager = mActivityTestRule.getActivity().getSupportFragmentManager();
+
+        mActivityTestRule.runOnUiThread(() -> CreateDirectoryFragment.show(mFragmentManager));
+        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
+        mCreateDirectoryFragment =
+                (CreateDirectoryFragment) mFragmentManager.findFragmentByTag(CREATE_FRAGEMENT_TAG);
+
+        final TextInputEditText inputView =
+                mCreateDirectoryFragment.getDialog().getWindow().findViewById(android.R.id.text1);
+
+        assertTrue(inputView.getHeight() > getInputTextHeight(inputView));
+
+    }
+
+    @Test
+    public void testCreateDialog_textInputEditText_shouldNotTruncateOnLargerDensity()
+            throws Throwable {
+
+        mScreenDensitySession.setLargerDensity();
+        mActivityTestRule.finishActivity();
+        mActivityTestRule.launchActivity(mFileActivityIntent);
+        mFragmentManager = mActivityTestRule.getActivity().getSupportFragmentManager();
+
+        mActivityTestRule.runOnUiThread(() -> CreateDirectoryFragment.show(mFragmentManager));
+        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
+        mCreateDirectoryFragment =
+                (CreateDirectoryFragment) mFragmentManager.findFragmentByTag(CREATE_FRAGEMENT_TAG);
+
+        final TextInputEditText inputView =
+                mCreateDirectoryFragment.getDialog().getWindow().findViewById(android.R.id.text1);
+
+        assertTrue(inputView.getHeight() > getInputTextHeight(inputView));
+    }
+
+    @Test
+    public void testCreateDialog_textInputEditText_shouldNotTruncateOnLargestDensity()
+            throws Throwable {
+
+        mScreenDensitySession.setLargestDensity();
+        mActivityTestRule.finishActivity();
+        mActivityTestRule.launchActivity(mFileActivityIntent);
+        mFragmentManager = mActivityTestRule.getActivity().getSupportFragmentManager();
+
+        mActivityTestRule.runOnUiThread(() -> CreateDirectoryFragment.show(mFragmentManager));
+        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
+        mCreateDirectoryFragment =
+                (CreateDirectoryFragment) mFragmentManager.findFragmentByTag(CREATE_FRAGEMENT_TAG);
+
+        final TextInputEditText inputView =
+                mCreateDirectoryFragment.getDialog().getWindow().findViewById(android.R.id.text1);
+
+        assertTrue(inputView.getHeight() > getInputTextHeight(inputView));
+    }
+
+    @Test
+    public void testCreateDirectoryFragmentShows_textInputEditText_shouldNotTruncateOnLandscape()
+            throws Throwable {
+        switchOrientation(mActivityTestRule.getActivity());
+        mScreenDensitySession.setLargestDensity();
+        mActivityTestRule.finishActivity();
+        mActivityTestRule.launchActivity(mFileActivityIntent);
+        mFragmentManager = mActivityTestRule.getActivity().getSupportFragmentManager();
+
+        mActivityTestRule.runOnUiThread(() -> CreateDirectoryFragment.show(mFragmentManager));
+        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
+        mCreateDirectoryFragment =
+                (CreateDirectoryFragment) mFragmentManager.findFragmentByTag(CREATE_FRAGEMENT_TAG);
+
+        final TextInputEditText inputView =
+                mCreateDirectoryFragment.getDialog().getWindow().findViewById(android.R.id.text1);
+        Paint paint = inputView.getPaint();
+        final float textSize = paint.getTextSize();
+
+        assertTrue(inputView.getHeight() > Math.round(textSize));
+
+        switchOrientation(mActivityTestRule.getActivity());
+    }
+
+    private static int getInputTextHeight(TextInputEditText v) {
+        Paint paint = v.getPaint();
+        final float textSize = paint.getTextSize();
+        final float textSpace = paint.getFontSpacing();
+        return Math.round(textSize + textSpace);
+    }
+
+    private static void switchOrientation(final Activity activity) {
+        final int[] orientations = getOrientations(activity);
+        activity.setRequestedOrientation(orientations[1]);
+    }
+
+    private static int[] getOrientations(final Activity activity) {
+        final int originalOrientation = activity.getResources().getConfiguration().orientation;
+        final int newOrientation = originalOrientation == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
+                ? ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
+                : ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
+        return new int[]{originalOrientation, newOrientation};
+    }
+
+    private static class ScreenDensitySession implements AutoCloseable {
+        private static final String DENSITY_PROP_DEVICE = "ro.sf.lcd_density";
+        private static final String DENSITY_PROP_EMULATOR = "qemu.sf.lcd_density";
+
+        private static final float DENSITY_DEFAULT = 1f;
+        private static final float DENSITY_LARGE = 1.09f;
+        private static final float DENSITY_LARGER = 1.19f;
+        private static final float DENSITY_LARGEST = 1.29f;
+
+        void setDefaultDensity() {
+            final int stableDensity = getStableDensity();
+            final int targetDensity = (int) (stableDensity * DENSITY_DEFAULT);
+            setDensity(targetDensity);
+        }
+
+        void setLargeDensity() {
+            final int stableDensity = getStableDensity();
+            final int targetDensity = (int) (stableDensity * DENSITY_LARGE);
+            setDensity(targetDensity);
+        }
+
+        void setLargerDensity() {
+            final int stableDensity = getStableDensity();
+            final int targetDensity = (int) (stableDensity * DENSITY_LARGER);
+            setDensity(targetDensity);
+        }
+
+        void setLargestDensity() {
+            final int stableDensity = getStableDensity();
+            final int targetDensity = (int) (stableDensity * DENSITY_LARGEST);
+            setDensity(targetDensity);
+        }
+
+        @Override
+        public void close() {
+            resetDensity();
+        }
+
+        private int getStableDensity() {
+            final String densityProp;
+            if (Build.IS_EMULATOR) {
+                densityProp = DENSITY_PROP_EMULATOR;
+            } else {
+                densityProp = DENSITY_PROP_DEVICE;
+            }
+
+            return Integer.parseInt(executeShellCommand("getprop " + densityProp).trim());
+        }
+
+        private void setDensity(int targetDensity) {
+            executeShellCommand("wm density " + targetDensity);
+
+            // Verify that the density is changed.
+            final String output = executeShellCommand("wm density");
+            final boolean success = output.contains("Override density: " + targetDensity);
+
+            assertTrue("Failed to set density to " + targetDensity, success);
+        }
+
+        private void resetDensity() {
+            executeShellCommand("wm density reset");
+        }
+    }
+
+    public static String executeShellCommand(String cmd) {
+        try {
+            return runShellCommand(InstrumentationRegistry.getInstrumentation(), cmd);
+        } catch (IOException e) {
+            fail("Failed reading command output: " + e);
+            return "";
+        }
+    }
+
+    public static String runShellCommand(Instrumentation instrumentation, String cmd)
+            throws IOException {
+        return runShellCommand(instrumentation.getUiAutomation(), cmd);
+    }
+
+    public static String runShellCommand(UiAutomation automation, String cmd)
+            throws IOException {
+        if (cmd.startsWith("pm grant ") || cmd.startsWith("pm revoke ")) {
+            throw new UnsupportedOperationException("Use UiAutomation.grantRuntimePermission() "
+                    + "or revokeRuntimePermission() directly, which are more robust.");
+        }
+        ParcelFileDescriptor pfd = automation.executeShellCommand(cmd);
+        byte[] buf = new byte[512];
+        int bytesRead;
+        FileInputStream fis = new ParcelFileDescriptor.AutoCloseInputStream(pfd);
+        StringBuffer stdout = new StringBuffer();
+        while ((bytesRead = fis.read(buf)) != -1) {
+            stdout.append(new String(buf, 0, bytesRead));
+        }
+        fis.close();
+        return stdout.toString();
+    }
+}
diff --git a/tests/common/com/android/documentsui/testing/TestCursor.java b/tests/common/com/android/documentsui/testing/TestCursor.java
new file mode 100644
index 0000000..56f4269
--- /dev/null
+++ b/tests/common/com/android/documentsui/testing/TestCursor.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.documentsui.testing;
+
+import android.database.MatrixCursor;
+
+public class TestCursor extends MatrixCursor {
+
+    public TestCursor(String[] columnNames) {
+        super(columnNames);
+    }
+
+    public void mockOnChange() {
+        onChange(false);
+    }
+}
diff --git a/tests/common/com/android/documentsui/testing/TestDocumentsProvider.java b/tests/common/com/android/documentsui/testing/TestDocumentsProvider.java
index 794d1c9..3e4dffd 100644
--- a/tests/common/com/android/documentsui/testing/TestDocumentsProvider.java
+++ b/tests/common/com/android/documentsui/testing/TestDocumentsProvider.java
@@ -117,7 +117,7 @@
     }
 
     private Cursor createDocumentsCursor(DocumentInfo... docs) {
-        MatrixCursor cursor = new MatrixCursor(DOCUMENTS_PROJECTION);
+        TestCursor cursor = new TestCursor(DOCUMENTS_PROJECTION);
         for (DocumentInfo doc : docs) {
             cursor.newRow()
                     .add(Document.COLUMN_DOCUMENT_ID, doc.documentId)
diff --git a/tests/functional/com/android/documentsui/FilesActivityUiTest.java b/tests/functional/com/android/documentsui/FilesActivityUiTest.java
index 16dc087..2da8309 100644
--- a/tests/functional/com/android/documentsui/FilesActivityUiTest.java
+++ b/tests/functional/com/android/documentsui/FilesActivityUiTest.java
@@ -57,7 +57,14 @@
     // to be able to click on it.
     public void testClickRecent() throws Exception {
         bots.roots.openRoot("Recent");
-        bots.main.assertSearchBarShow();
+
+        boolean showSearchBar =
+                context.getResources().getBoolean(R.bool.show_search_bar);
+        if (showSearchBar) {
+            bots.main.assertSearchBarShow();
+        } else {
+            bots.main.assertWindowTitle("Recent");
+        }
     }
 
     public void testRootClick_SetsWindowTitle() throws Exception {
diff --git a/tests/unit/com/android/documentsui/RecentsLoaderTests.java b/tests/unit/com/android/documentsui/RecentsLoaderTests.java
index f044b92..73ba36f 100644
--- a/tests/unit/com/android/documentsui/RecentsLoaderTests.java
+++ b/tests/unit/com/android/documentsui/RecentsLoaderTests.java
@@ -29,6 +29,7 @@
 import com.android.documentsui.base.DocumentInfo;
 import com.android.documentsui.base.State;
 import com.android.documentsui.testing.ActivityManagers;
+import com.android.documentsui.testing.TestCursor;
 import com.android.documentsui.testing.TestEnv;
 import com.android.documentsui.testing.TestFileTypeLookup;
 import com.android.documentsui.testing.TestImmediateExecutor;
@@ -38,6 +39,9 @@
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
 @RunWith(AndroidJUnit4.class)
 @MediumTest
 public class RecentsLoaderTests {
@@ -45,6 +49,7 @@
     private TestEnv mEnv;
     private TestActivity mActivity;
     private RecentsLoader mLoader;
+    private boolean mContentChanged;
 
     @Before
     public void setUp() {
@@ -105,4 +110,28 @@
             assertEquals(0, flags & Document.FLAG_SUPPORTS_MOVE);
         }
     }
+
+    @Test
+    public void testContentsUpdate_observable() throws Exception {
+        CountDownLatch latch = new CountDownLatch(1);
+        Runnable callback = () -> {
+            latch.countDown();
+            mContentChanged = true;
+        };
+        mLoader.setObserver(new LockingContentObserver(new ContentLock(), callback));
+
+        final DocumentInfo doc = mEnv.model.createFile("freddy.jpg");
+        doc.lastModified = System.currentTimeMillis();
+        mEnv.mockProviders.get(TestProvidersAccess.HOME.authority)
+                .setNextRecentDocumentsReturns(doc);
+
+        mLoader.loadInBackground();
+
+        TestCursor c = (TestCursor) mEnv.mockProviders.get(TestProvidersAccess.HOME.authority)
+                .queryRecentDocuments(null, null);
+        c.mockOnChange();
+
+        latch.await(1, TimeUnit.SECONDS);
+        assertTrue(mContentChanged);
+    }
 }