MenuCompat.java revision 27aea04b07c1fafa0f815aa4f80374a9e051b41c
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.support.v4.view; 18 19import android.view.MenuItem; 20 21/** 22 * Helper for accessing newer features in menus. 23 */ 24public class MenuCompat { 25 /** 26 * Interface for the full API. 27 */ 28 interface MenuVersionImpl { 29 public boolean setShowAsAction(MenuItem item, int actionEnum); 30 } 31 32 /** 33 * Interface implementation that doesn't use anything about v4 APIs. 34 */ 35 static class BaseMenuVersionImpl implements MenuVersionImpl { 36 @Override 37 public boolean setShowAsAction(MenuItem item, int actionEnum) { 38 return false; 39 } 40 } 41 42 /** 43 * Interface implementation for devices with at least v11 APIs. 44 */ 45 static class HoneycombMenuVersionImpl implements MenuVersionImpl { 46 @Override 47 public boolean setShowAsAction(MenuItem item, int actionEnum) { 48 MenuCompatHoneycomb.setShowAsAction(item, actionEnum); 49 return true; 50 } 51 } 52 53 /** 54 * Select the correct implementation to use for the current platform. 55 */ 56 static final MenuVersionImpl IMPL; 57 static { 58 if (android.os.Build.VERSION.SDK_INT >= 11) { 59 IMPL = new HoneycombMenuVersionImpl(); 60 } else { 61 IMPL = new BaseMenuVersionImpl(); 62 } 63 } 64 65 // ------------------------------------------------------------------- 66 67 /** 68 * Call {@link MenuItem#setShowAsAction(int) MenuItem.setShowAsAction()}. 69 * If running on a pre-{@android.os.Build.VERSION_CODES#HONEYCOMB} device, 70 * does nothing and returns false. Otherwise returns true. 71 */ 72 public static boolean setShowAsAction(MenuItem item, int actionEnum) { 73 return IMPL.setShowAsAction(item, actionEnum); 74 } 75} 76