Don't trigger HW acceleration from Toasts on low-end devices.

BUG=520600

Review URL: https://codereview.chromium.org/1276523003

Cr-Commit-Position: refs/heads/master@{#343518}

PRESUBMIT.py

@@ -1312,6 +1312,43 @@ def _CheckJavaStyle(input_api, output_api):
       black_list=_EXCLUDED_PATHS + input_api.DEFAULT_BLACK_LIST)
 
 
+def _CheckAndroidToastUsage(input_api, output_api):
+  """Checks that code uses org.chromium.ui.widget.Toast instead of
+     android.widget.Toast (Chromium Toast doesn't force hardware
+     acceleration on low-end devices, saving memory).
+  """
+  toast_import_pattern = input_api.re.compile(
+      r'^import android\.widget\.Toast;$')
+
+  errors = []
+
+  sources = lambda affected_file: input_api.FilterSourceFile(
+      affected_file,
+      black_list=(_EXCLUDED_PATHS +
+                  _TEST_CODE_EXCLUDED_PATHS +
+                  input_api.DEFAULT_BLACK_LIST +
+                  (r'^chromecast[\\\/].*',
+                   r'^remoting[\\\/].*')),
+      white_list=(r'.*\.java$',))
+
+  for f in input_api.AffectedSourceFiles(sources):
+    for line_num, line in f.ChangedContents():
+      if toast_import_pattern.search(line):
+        errors.append("%s:%d" % (f.LocalPath(), line_num))
+
+  results = []
+
+  if errors:
+    results.append(output_api.PresubmitError(
+        'android.widget.Toast usage is detected. Android toasts use hardware'
+        ' acceleration, and can be\ncostly on low-end devices. Please use'
+        ' org.chromium.ui.widget.Toast instead.\n'
+        'Contact dskiba@chromium.org if you have any questions.',
+        errors))
+
+  return results
+
+
 def _CheckAndroidCrLogUsage(input_api, output_api):
   """Checks that new logs using org.chromium.base.Log:
     - Are using 'TAG' as variable name for the tags (warn)
@@ -1530,6 +1567,7 @@ def _AndroidSpecificOnUploadChecks(input_api, output_api):
   """Groups checks that target android code."""
   results = []
   results.extend(_CheckAndroidCrLogUsage(input_api, output_api))
+  results.extend(_CheckAndroidToastUsage(input_api, output_api))
   return results
 
 

chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java

@@ -22,7 +22,6 @@ import android.view.ViewGroup;
 import android.view.Window;
 import android.view.WindowManager;
 import android.widget.FrameLayout;
-import android.widget.Toast;
 
 import org.chromium.base.CommandLine;
 import org.chromium.base.MemoryPressureListener;
@@ -93,6 +92,7 @@ import org.chromium.content.common.ContentSwitches;
 import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.ui.base.DeviceFormFactor;
 import org.chromium.ui.base.PageTransition;
+import org.chromium.ui.widget.Toast;
 
 /**
  * This is the main activity for ChromeMobile when not running in document mode.  All the tabs
@@ -221,7 +221,7 @@ public class ChromeTabbedActivity extends ChromeActivity implements ActionBarDel
                 public void didAddTab(Tab tab, TabLaunchType type) {
                     if (type == TabLaunchType.FROM_LONGPRESS_BACKGROUND
                             && !DeviceClassManager.enableAnimations(getApplicationContext())) {
-                        Toast.makeText(getBaseContext(),
+                        Toast.makeText(ChromeTabbedActivity.this,
                                 R.string.open_in_new_tab_toast,
                                 Toast.LENGTH_SHORT).show();
                     }

chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java

@@ -10,7 +10,6 @@ import android.graphics.Bitmap;
 import android.os.Handler;
 import android.os.Looper;
 import android.util.Base64;
-import android.widget.Toast;
 
 import org.chromium.base.ApplicationStatus;
 import org.chromium.base.VisibleForTesting;
@@ -20,6 +19,7 @@ import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.webapps.WebappLauncherActivity;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.content_public.common.ScreenOrientationConstants;
+import org.chromium.ui.widget.Toast;
 
 import java.io.ByteArrayOutputStream;
 import java.util.UUID;

chrome/android/java/src/org/chromium/chrome/browser/download/ChromeDownloadDelegate.java

@@ -13,7 +13,6 @@ import android.text.TextUtils;
 import android.util.Log;
 import android.webkit.MimeTypeMap;
 import android.webkit.URLUtil;
-import android.widget.Toast;
 
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
@@ -26,6 +25,7 @@ import org.chromium.chrome.browser.tabmodel.TabModelSelector;
 import org.chromium.content.browser.ContentViewDownloadDelegate;
 import org.chromium.content.browser.DownloadInfo;
 import org.chromium.content_public.browser.WebContents;
+import org.chromium.ui.widget.Toast;
 
 import java.io.File;
 

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java

@@ -19,7 +19,6 @@ import android.os.Handler;
 import android.preference.PreferenceManager;
 import android.text.TextUtils;
 import android.util.LongSparseArray;
-import android.widget.Toast;
 
 import org.chromium.base.Log;
 import org.chromium.base.ThreadUtils;
@@ -29,6 +28,7 @@ import org.chromium.chrome.R;
 import org.chromium.chrome.browser.externalnav.ExternalNavigationDelegateImpl;
 import org.chromium.content.browser.DownloadController;
 import org.chromium.content.browser.DownloadInfo;
+import org.chromium.ui.widget.Toast;
 
 import java.io.File;
 import java.util.ArrayList;

chrome/android/java/src/org/chromium/chrome/browser/media/remote/AbstractMediaRouteController.java

@@ -14,7 +14,6 @@ import android.support.v7.media.MediaRouteSelector;
 import android.support.v7.media.MediaRouter;
 import android.support.v7.media.MediaRouter.RouteInfo;
 import android.util.Log;
-import android.widget.Toast;
 
 import com.google.android.gms.cast.CastMediaControlIntent;
 
@@ -24,6 +23,7 @@ import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.media.remote.RemoteVideoInfo.PlayerState;
+import org.chromium.ui.widget.Toast;
 
 import java.util.HashSet;
 import java.util.Set;

chrome/android/java/src/org/chromium/chrome/browser/media/remote/DefaultMediaRouteController.java

@@ -20,7 +20,6 @@ import android.support.v7.media.MediaRouter;
 import android.support.v7.media.MediaRouter.RouteInfo;
 import android.support.v7.media.MediaSessionStatus;
 import android.util.Log;
-import android.widget.Toast;
 
 import com.google.android.gms.cast.CastMediaControlIntent;
 
@@ -30,6 +29,7 @@ import org.chromium.base.CommandLine;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.media.remote.RemoteVideoInfo.PlayerState;
+import org.chromium.ui.widget.Toast;
 
 import java.net.URI;
 import java.net.URISyntaxException;

chrome/android/java/src/org/chromium/chrome/browser/media/remote/RemoteMediaPlayerController.java

@@ -17,7 +17,6 @@ import android.support.v7.app.MediaRouteChooserDialogFragment;
 import android.support.v7.app.MediaRouteControllerDialogFragment;
 import android.support.v7.app.MediaRouteDialogFactory;
 import android.util.Log;
-import android.widget.Toast;
 
 import com.google.android.gms.cast.CastMediaControlIntent;
 
@@ -28,6 +27,7 @@ import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.media.remote.RemoteVideoInfo.PlayerState;
+import org.chromium.ui.widget.Toast;
 
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;

chrome/android/java/src/org/chromium/chrome/browser/nfc/BeamCallback.java

@@ -14,11 +14,11 @@ import android.os.Build;
 import android.os.Handler;
 import android.os.Looper;
 import android.text.TextUtils;
-import android.widget.Toast;
 
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
+import org.chromium.ui.widget.Toast;
 
 import java.net.MalformedURLException;
 import java.net.URL;

chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageToolbar.java

@@ -12,13 +12,13 @@ import android.view.View.OnLongClickListener;
 import android.view.ViewGroup;
 import android.widget.LinearLayout;
 import android.widget.TextView;
-import android.widget.Toast;
 
 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.appmenu.ChromeAppMenuPropertiesDelegate;
 import org.chromium.chrome.browser.widget.TintedDrawable;
 import org.chromium.ui.base.DeviceFormFactor;
+import org.chromium.ui.widget.Toast;
 
 /**
  * The toolbar at the bottom of the new tab page. Contains buttons to open the bookmarks and

chrome/android/java/src/org/chromium/chrome/browser/preferences/ManagedPreferencesUtils.java

@@ -5,9 +5,9 @@
 package org.chromium.chrome.browser.preferences;
 
 import android.content.Context;
-import android.widget.Toast;
 
 import org.chromium.chrome.R;
+import org.chromium.ui.widget.Toast;
 
 /**
  * Utilities and common methods to handle settings managed by policies.

chrome/android/java/src/org/chromium/chrome/browser/preferences/datareduction/DataReductionPromoScreen.java

@@ -19,7 +19,6 @@ import android.view.View;
 import android.widget.LinearLayout;
 import android.widget.LinearLayout.LayoutParams;
 import android.widget.TextView;
-import android.widget.Toast;
 
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.multiwindow.MultiWindowUtils;
@@ -27,6 +26,7 @@ import org.chromium.chrome.browser.net.spdyproxy.DataReductionProxySettings;
 import org.chromium.chrome.browser.preferences.PreferencesLauncher;
 import org.chromium.ui.text.SpanApplier;
 import org.chromium.ui.text.SpanApplier.SpanInfo;
+import org.chromium.ui.widget.Toast;
 
 /**
  * The promo screen encouraging users to enable Data Saver.

chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/ClearBrowsingDataDialogFragment.java

@@ -23,7 +23,6 @@ import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.CheckedTextView;
 import android.widget.TextView;
-import android.widget.Toast;
 
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.preferences.PrefServiceBridge;
@@ -31,6 +30,7 @@ import org.chromium.chrome.browser.preferences.Preferences;
 import org.chromium.chrome.browser.signin.AccountManagementFragment;
 import org.chromium.sync.signin.ChromeSigninController;
 import org.chromium.ui.text.SpanApplier;
+import org.chromium.ui.widget.Toast;
 
 import java.util.EnumSet;
 

chrome/android/java/src/org/chromium/chrome/browser/preferences/website/LanguagePreferences.java

@@ -12,7 +12,6 @@ import android.preference.PreferenceFragment;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
-import android.widget.Toast;
 
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.help.HelpAndFeedback;
@@ -20,6 +19,7 @@ import org.chromium.chrome.browser.preferences.ChromeBaseCheckBoxPreference;
 import org.chromium.chrome.browser.preferences.ManagedPreferenceDelegate;
 import org.chromium.chrome.browser.preferences.PrefServiceBridge;
 import org.chromium.chrome.browser.profiles.Profile;
+import org.chromium.ui.widget.Toast;
 
 /**
  * Fragment to keep track of the translate preferences.

chrome/android/java/src/org/chromium/chrome/browser/preferences/website/SingleCategoryPreferences.java

@@ -19,7 +19,6 @@ import android.view.MenuItem;
 import android.view.inputmethod.EditorInfo;
 import android.widget.ListView;
 import android.widget.TextView;
-import android.widget.Toast;
 
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.preferences.ChromeBaseCheckBoxPreference;
@@ -34,6 +33,7 @@ import org.chromium.chrome.browser.preferences.ProtectedContentResetCredentialCo
 import org.chromium.chrome.browser.widget.TintedDrawable;
 import org.chromium.content.browser.MediaDrmCredentialManager;
 import org.chromium.content.browser.MediaDrmCredentialManager.MediaDrmCredentialManagerCallback;
+import org.chromium.ui.widget.Toast;
 
 import java.util.ArrayList;
 import java.util.Collections;

chrome/android/java/src/org/chromium/chrome/browser/toolbar/ToolbarLayout.java

@@ -17,7 +17,6 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 import android.widget.ProgressBar;
-import android.widget.Toast;
 
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.appmenu.AppMenuButtonHelper;
@@ -29,6 +28,7 @@ import org.chromium.chrome.browser.util.ViewUtils;
 import org.chromium.chrome.browser.widget.TintedImageButton;
 import org.chromium.chrome.browser.widget.ToolbarProgressBar;
 import org.chromium.ui.UiUtils;
+import org.chromium.ui.widget.Toast;
 
 /**
  * Layout class that contains the base shared logic for manipulating the toolbar component. For

chrome/android/javatests/src/org/chromium/chrome/browser/hardware_acceleration/ChromeTabbedActivityHWATest.java

@@ -10,19 +10,32 @@ import android.test.suitebuilder.annotation.SmallTest;
 
 import org.chromium.base.test.util.Restriction;
 import org.chromium.base.test.util.UrlUtils;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.test.ChromeTabbedActivityTestBase;
+import org.chromium.chrome.test.util.browser.contextmenu.ContextMenuUtils;
 
 /**
  * Tests that ChromeTabbedActivity is hardware accelerated only high-end devices.
  */
 public class ChromeTabbedActivityHWATest extends ChromeTabbedActivityTestBase {
 
+    private static final String LINKED_URL = UrlUtils.encodeHtmlDataUri(
+            "<html>"
+            + "  <head>"
+            + "    <title>Linked Page</title>"
+            + "  </head>"
+            + "  <body style='margin: 0em; background: #ff00ff;'></body>"
+            + "</html>");
+
+    private static final String LINK_ID = "testLink";
     private static final String URL = UrlUtils.encodeHtmlDataUri(
             "<html>"
             + "  <head>"
             + "    <title>Test Page</title>"
             + "  </head>"
             + "  <body style='margin: 0em; background: #ffff00;'></body>"
+            + "  <a href='" + LINKED_URL + "' id='" + LINK_ID + "'>Test Link</a>"
             + "</html>");
 
     @Override
@@ -40,4 +53,16 @@ public class ChromeTabbedActivityHWATest extends ChromeTabbedActivityTestBase {
     public void testNoRenderThread() throws Exception {
         Utils.assertNoRenderThread();
     }
+
+    @Restriction(RESTRICTION_TYPE_LOW_END_DEVICE)
+    @SmallTest
+    public void testToastNoRenderThread() throws Exception {
+        // Open link in new tab (shows 'Tab Opened In Background' toast)
+        Tab tab = getActivity().getActivityTab();
+        ContextMenuUtils.selectContextMenuItem(this, tab, LINK_ID,
+                R.id.contextmenu_open_in_new_tab);
+        getInstrumentation().waitForIdleSync();
+
+        Utils.assertNoRenderThread();
+    }
 }

chrome/android/javatests/src/org/chromium/chrome/browser/hardware_acceleration/Utils.java

@@ -5,6 +5,7 @@
 package org.chromium.chrome.browser.hardware_acceleration;
 
 import android.app.Dialog;
+import android.os.Build;
 import android.view.View;
 import android.view.ViewTreeObserver.OnPreDrawListener;
 
@@ -14,6 +15,7 @@ import org.chromium.base.SysUtils;
 import org.chromium.base.ThreadUtils;
 import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.content.browser.test.util.CallbackHelper;
+import org.chromium.ui.widget.Toast;
 
 import java.util.HashSet;
 import java.util.Set;
@@ -31,6 +33,11 @@ public class Utils {
     public static void assertHardwareAcceleration(ChromeActivity activity) throws Exception {
         assertActivityAcceleration(activity);
         assertChildWindowAcceleration(activity);
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            // Toasts are only HW accelerated on LOLLIPOP+
+            assertToastAcceleration(activity);
+        }
     }
 
     /**
@@ -63,12 +70,33 @@ public class Utils {
         });
 
         listenerCalled.waitForCallback(0);
+        assertAcceleration(accelerated);
+    }
 
-        if (SysUtils.isLowEndDevice()) {
-            Assert.assertFalse(accelerated.get());
-        } else {
-            Assert.assertTrue(accelerated.get());
-        }
+    private static void assertToastAcceleration(final ChromeActivity activity)
+            throws Exception {
+        final AtomicBoolean accelerated = new AtomicBoolean();
+        final CallbackHelper listenerCalled = new CallbackHelper();
+
+        ThreadUtils.postOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                // We are using Toast.makeText(context, ...) instead of new Toast(context)
+                // because that Toast constructor is unused and is deleted by proguard.
+                Toast toast = Toast.makeText(activity, "", Toast.LENGTH_SHORT);
+                toast.setView(new View(activity) {
+                    @Override
+                    public void onAttachedToWindow() {
+                        accelerated.set(isHardwareAccelerated());
+                        listenerCalled.notifyCalled();
+                    }
+                });
+                toast.show();
+            }
+        });
+
+        listenerCalled.waitForCallback(0);
+        assertAcceleration(accelerated);
     }
 
     private static void assertChildWindowAcceleration(final ChromeActivity activity)
@@ -93,7 +121,10 @@ public class Utils {
         });
 
         listenerCalled.waitForCallback(0);
+        assertAcceleration(accelerated);
+    }
 
+    private static void assertAcceleration(AtomicBoolean accelerated) {
         if (SysUtils.isLowEndDevice()) {
             Assert.assertFalse(accelerated.get());
         } else {

chrome/android/shell/java/src/org/chromium/chrome/shell/ChromeShellActivity.java

@@ -18,7 +18,6 @@ import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Toast;
 
 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.BaseSwitches;
@@ -62,6 +61,7 @@ import org.chromium.sync.signin.AccountManagerHelper;
 import org.chromium.sync.signin.ChromeSigninController;
 import org.chromium.ui.base.ActivityWindowAndroid;
 import org.chromium.ui.base.WindowAndroid;
+import org.chromium.ui.widget.Toast;
 
 /**
  * The {@link android.app.Activity} component of a basic test shell to test Chrome features.

content/public/android/java/src/org/chromium/content/browser/TracingControllerAndroid.java

@@ -10,12 +10,12 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Environment;
 import android.text.TextUtils;
-import android.widget.Toast;
 
 import org.chromium.base.Log;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.content.R;
+import org.chromium.ui.widget.Toast;
 
 import java.io.File;
 import java.text.SimpleDateFormat;

ui/android/java/src/org/chromium/ui/base/Clipboard.java

@@ -7,11 +7,11 @@ package org.chromium.ui.base;
 import android.content.ClipData;
 import android.content.ClipboardManager;
 import android.content.Context;
-import android.widget.Toast;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.ui.R;
+import org.chromium.ui.widget.Toast;
 
 /**
  * Simple proxy that provides C++ code with an access pathway to the Android

ui/android/java/src/org/chromium/ui/base/WindowAndroid.java

@@ -23,11 +23,11 @@ import android.util.SparseArray;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.accessibility.AccessibilityManager;
-import android.widget.Toast;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.ui.VSyncMonitor;
+import org.chromium.ui.widget.Toast;
 
 import java.lang.ref.WeakReference;
 import java.util.HashMap;

ui/android/java/src/org/chromium/ui/widget/Toast.java

@@ -0,0 +1,185 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.ui.widget;
+
+import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
+
+import android.annotation.SuppressLint;
+import android.app.Activity;
+import android.content.Context;
+import android.content.ContextWrapper;
+import android.content.pm.ActivityInfo;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.content.res.Resources;
+import android.os.Build;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
+
+import org.chromium.base.SysUtils;
+
+/**
+ * Toast wrapper, makes sure toasts don't trigger HW acceleration when created
+ * from activities that are not HW accelerated.
+ *
+ * Can (and should) also be used for Chromium-related additions and extensions.
+ */
+public class Toast {
+
+    public static final int LENGTH_SHORT = android.widget.Toast.LENGTH_SHORT;
+    public static final int LENGTH_LONG = android.widget.Toast.LENGTH_LONG;
+
+    private android.widget.Toast mToast;
+    private ViewGroup mSWLayout;
+
+    public Toast(Context context) {
+        this(context, new android.widget.Toast(context));
+    }
+
+    private Toast(Context context, android.widget.Toast toast) {
+        mToast = toast;
+
+        if (SysUtils.isLowEndDevice()
+                && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP
+                && context.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.LOLLIPOP
+                && isHWAccelerationDisabled(context)) {
+            // Don't HW accelerate Toasts. Unfortunately the only way to do it is to make
+            // toast.getView().getContext().getApplicationInfo().targetSdkVersion return
+            // something less than LOLLIPOP (see WindowManagerGlobal.addView).
+            mSWLayout = new FrameLayout(new ContextWrapper(context) {
+                @Override
+                public ApplicationInfo getApplicationInfo() {
+                    ApplicationInfo info = new ApplicationInfo(super.getApplicationInfo());
+                    info.targetSdkVersion = Build.VERSION_CODES.KITKAT;
+                    return info;
+                }
+            });
+
+            setView(toast.getView());
+        }
+    }
+
+    public android.widget.Toast getAndroidToast() {
+        return mToast;
+    }
+
+    public void show() {
+        mToast.show();
+    }
+
+    public void cancel() {
+        mToast.cancel();
+    }
+
+    public void setView(View view) {
+        if (mSWLayout != null) {
+            mSWLayout.removeAllViews();
+            if (view != null) {
+                mSWLayout.addView(view, WRAP_CONTENT, WRAP_CONTENT);
+                mToast.setView(mSWLayout);
+            } else {
+                // When null view is set we propagate it to the toast to trigger appropriate
+                // handling (for example show() throws an exception when view is null).
+                mToast.setView(null);
+            }
+        } else {
+            mToast.setView(view);
+        }
+    }
+
+    public View getView() {
+        if (mToast.getView() == null) {
+            return null;
+        }
+        if (mSWLayout != null) {
+            return mSWLayout.getChildAt(0);
+        } else {
+            return mToast.getView();
+        }
+    }
+
+    public void setDuration(int duration) {
+        mToast.setDuration(duration);
+    }
+
+    public int getDuration() {
+        return mToast.getDuration();
+    }
+
+    public void setMargin(float horizontalMargin, float verticalMargin) {
+        mToast.setMargin(horizontalMargin, verticalMargin);
+    }
+
+    public float getHorizontalMargin() {
+        return mToast.getHorizontalMargin();
+    }
+
+    public float getVerticalMargin() {
+        return mToast.getVerticalMargin();
+    }
+
+    public void setGravity(int gravity, int xOffset, int yOffset) {
+        mToast.setGravity(gravity, xOffset, yOffset);
+    }
+
+    public int getGravity() {
+        return mToast.getGravity();
+    }
+
+    public int getXOffset() {
+        return mToast.getXOffset();
+    }
+
+    public int getYOffset() {
+        return mToast.getYOffset();
+    }
+
+    public void setText(int resId) {
+        mToast.setText(resId);
+    }
+
+    public void setText(CharSequence s) {
+        mToast.setText(s);
+    }
+
+    @SuppressLint("ShowToast")
+    public static Toast makeText(Context context, CharSequence text, int duration) {
+        return new Toast(context, android.widget.Toast.makeText(context, text, duration));
+    }
+
+    @SuppressLint("ShowToast")
+    public static Toast makeText(Context context, int resId, int duration)
+            throws Resources.NotFoundException {
+        return new Toast(context, android.widget.Toast.makeText(context, resId, duration));
+    }
+
+    private static Activity getActivity(Context context) {
+        while (context != null) {
+            if (context instanceof Activity) {
+                return (Activity) context;
+            }
+            if (!(context instanceof ContextWrapper)) {
+                break;
+            }
+            context = ((ContextWrapper) context).getBaseContext();
+        }
+        return null;
+    }
+
+    private static boolean isHWAccelerationDisabled(Context context) {
+        Activity activity = getActivity(context);
+        if (activity == null) {
+            return false;
+        }
+        try {
+            ActivityInfo info = activity.getPackageManager().getActivityInfo(
+                    activity.getComponentName(), 0);
+            return (info.flags & ActivityInfo.FLAG_HARDWARE_ACCELERATED) == 0;
+        } catch (PackageManager.NameNotFoundException e) {
+            return false;
+        }
+    }
+}