Don't apply fancy back logic when drawer is not present.

Add test coverage. Booya!

Bug: 27078649
Change-Id: Id2ce53009ee212b3af8d143091859d30e2bc76b1

packages/DocumentsUI/src/com/android/documentsui/BaseActivity.java

@@ -539,7 +539,8 @@ public abstract class BaseActivity extends Activity
         // Do some "do what a I want" drawer fiddling, but don't
         // do it if user already hit back recently and we recently
         // did some fiddling.
-        if ((System.currentTimeMillis() - mDrawerLastFiddled) > DRAWER_NO_FIDDLE_DELAY) {
+        if (mDrawer.isPresent()
+                && (System.currentTimeMillis() - mDrawerLastFiddled) > DRAWER_NO_FIDDLE_DELAY) {
             // Close drawer if it is open.
             if (mDrawer.isOpen()) {
                 mDrawer.setOpen(false);

packages/DocumentsUI/tests/src/com/android/documentsui/DownloadsActivityUiTest.java

@@ -16,35 +16,18 @@
 
 package com.android.documentsui;
 
-import static com.android.documentsui.StubProvider.DEFAULT_AUTHORITY;
 import static com.android.documentsui.StubProvider.ROOT_0_ID;
 
-import android.app.Instrumentation;
-import android.content.ContentProviderClient;
-import android.content.ContentResolver;
-import android.content.Context;
 import android.content.Intent;
 import android.os.RemoteException;
 import android.provider.DocumentsContract;
 import android.support.test.uiautomator.By;
-import android.support.test.uiautomator.Configurator;
-import android.support.test.uiautomator.UiDevice;
 import android.support.test.uiautomator.Until;
-import android.test.ActivityInstrumentationTestCase2;
 import android.test.suitebuilder.annotation.LargeTest;
-import android.util.Log;
-import android.view.MotionEvent;
-
-import com.android.documentsui.model.RootInfo;
 
 @LargeTest
 public class DownloadsActivityUiTest extends ActivityTest<DownloadsActivity> {
 
-    private static final int TIMEOUT = 5000;
-    private static final String TAG = "DownloadsActivityUiTest";
-    private static final String TARGET_PKG = "com.android.documentsui";
-    private static final String LAUNCHER_PKG = "com.android.launcher";
-
     public DownloadsActivityUiTest() {
         super(DownloadsActivity.class);
     }
@@ -108,4 +91,11 @@ public class DownloadsActivityUiTest extends ActivityTest<DownloadsActivity> {
         device.waitForIdle();
         assertNotNull(bot.menuShare());
     }
+
+    public void testClosesOnBack() throws Exception {
+        DownloadsActivity activity = getActivity();
+        device.pressBack();
+        device.wait(Until.gone(By.text(ROOT_0_ID)), TIMEOUT);  // wait for the window to go away
+        assertTrue(activity.isDestroyed());
+    }
 }

packages/DocumentsUI/tests/src/com/android/documentsui/FilesActivityUiTest.java

@@ -16,34 +16,15 @@
 
 package com.android.documentsui;
 
-import static com.android.documentsui.StubProvider.DEFAULT_AUTHORITY;
 import static com.android.documentsui.StubProvider.ROOT_0_ID;
 import static com.android.documentsui.StubProvider.ROOT_1_ID;
 
-import android.app.Instrumentation;
-import android.content.ContentProviderClient;
-import android.content.ContentResolver;
-import android.content.Context;
-import android.content.Intent;
 import android.os.RemoteException;
-import android.support.test.uiautomator.By;
-import android.support.test.uiautomator.Configurator;
-import android.support.test.uiautomator.UiDevice;
-import android.support.test.uiautomator.Until;
 import android.test.suitebuilder.annotation.LargeTest;
-import android.util.Log;
-import android.view.MotionEvent;
-
-import com.android.documentsui.model.RootInfo;
 
 @LargeTest
 public class FilesActivityUiTest extends ActivityTest<FilesActivity> {
 
-    private static final int TIMEOUT = 5000;
-    private static final String TAG = "FilesActivityUiTest";
-    private static final String TARGET_PKG = "com.android.documentsui";
-    private static final String LAUNCHER_PKG = "com.android.launcher";
-
     public FilesActivityUiTest() {
         super(FilesActivity.class);
     }

packages/DocumentsUI/tests/src/com/android/documentsui/RenameDocumentUiTest.java

@@ -18,9 +18,6 @@ package com.android.documentsui;
 
 import static com.android.documentsui.StubProvider.ROOT_0_ID;
 
-import android.support.test.uiautomator.UiObject;
-import android.support.test.uiautomator.UiObjectNotFoundException;
-import android.test.InstrumentationTestCase;
 import android.test.suitebuilder.annotation.LargeTest;
 
 @LargeTest

packages/DocumentsUI/tests/src/com/android/documentsui/SearchViewUiTest.java

@@ -19,8 +19,6 @@ package com.android.documentsui;
 import static com.android.documentsui.StubProvider.ROOT_0_ID;
 import static com.android.documentsui.StubProvider.ROOT_1_ID;
 
-import android.support.test.uiautomator.UiObject;
-import android.test.InstrumentationTestCase;
 import android.test.suitebuilder.annotation.LargeTest;
 
 @LargeTest

packages/DocumentsUI/tests/src/com/android/documentsui/UiBot.java

@@ -21,6 +21,7 @@ import static junit.framework.Assert.assertNotNull;
 import static junit.framework.Assert.assertTrue;
 import static junit.framework.Assert.assertFalse;
 
+import android.app.Activity;
 import android.content.Context;
 import android.support.test.uiautomator.By;
 import android.support.test.uiautomator.BySelector;