| /* |
| * Copyright (C) 2011 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 android.support.v4.app; |
| |
| import android.app.Activity; |
| import android.os.Build; |
| |
| /** |
| * Helper for accessing features in {@link android.app.Activity} |
| * introduced after API level 4 in a backwards compatible fashion. |
| */ |
| public class ActivityCompat { |
| /** |
| * Invalidate the activity's options menu, if able. |
| * |
| * <p>Before API level 11 (Android 3.0/Honeycomb) the lifecycle of the |
| * options menu was controlled primarily by the user's operation of |
| * the hardware menu key. When the user presses down on the menu key |
| * for the first time the menu was created and prepared by calls |
| * to {@link Activity#onCreateOptionsMenu(android.view.Menu)} and |
| * {@link Activity#onPrepareOptionsMenu(android.view.Menu)} respectively. |
| * Subsequent presses of the menu key kept the existing instance of the |
| * Menu itself and called {@link Activity#onPrepareOptionsMenu(android.view.Menu)} |
| * to give the activity an opportunity to contextually alter the menu |
| * before the menu panel was shown.</p> |
| * |
| * <p>In Android 3.0+ the Action Bar forces the options menu to be built early |
| * so that items chosen to show as actions may be displayed when the activity |
| * first becomes visible. The Activity method invalidateOptionsMenu forces |
| * the entire menu to be destroyed and recreated from |
| * {@link Activity#onCreateOptionsMenu(android.view.Menu)}, offering a similar |
| * though heavier-weight opportunity to change the menu's contents. Normally |
| * this functionality is used to support a changing configuration of Fragments.</p> |
| * |
| * <p>Applications may use this support helper to signal a significant change in |
| * activity state that should cause the options menu to be rebuilt. If the app |
| * is running on an older platform version that does not support menu invalidation |
| * the app will still receive {@link Activity#onPrepareOptionsMenu(android.view.Menu)} |
| * the next time the user presses the menu key and this method will return false. |
| * If this method returns true the options menu was successfully invalidated.</p> |
| * |
| * @param activity Invalidate the options menu of this activity |
| * @return true if this operation was supported and it completed; false if it was not available. |
| */ |
| public static boolean invalidateOptionsMenu(Activity activity) { |
| if (Build.VERSION.SDK_INT >= 11) { |
| ActivityCompatHoneycomb.invalidateOptionsMenu(activity); |
| return true; |
| } |
| return false; |
| } |
| } |