1/* 2 * Copyright (C) 2012 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.content; 18 19import android.app.Activity; 20import android.content.Context; 21import android.content.Intent; 22import android.os.Build; 23import android.os.Bundle; 24 25/** 26 * Helper for accessing features in {@link android.content.Context} 27 * introduced after API level 4 in a backwards compatible fashion. 28 */ 29public class ContextCompat { 30 31 /** 32 * Start a set of activities as a synthesized task stack, if able. 33 * 34 * <p>In API level 11 (Android 3.0/Honeycomb) the recommended conventions for 35 * app navigation using the back key changed. The back key's behavior is local 36 * to the current task and does not capture navigation across different tasks. 37 * Navigating across tasks and easily reaching the previous task is accomplished 38 * through the "recents" UI, accessible through the software-provided Recents key 39 * on the navigation or system bar. On devices with the older hardware button configuration 40 * the recents UI can be accessed with a long press on the Home key.</p> 41 * 42 * <p>When crossing from one task stack to another post-Android 3.0, 43 * the application should synthesize a back stack/history for the new task so that 44 * the user may navigate out of the new task and back to the Launcher by repeated 45 * presses of the back key. Back key presses should not navigate across task stacks.</p> 46 * 47 * <p>startActivities provides a mechanism for constructing a synthetic task stack of 48 * multiple activities. If the underlying API is not available on the system this method 49 * will return false.</p> 50 * 51 * @param context Start activities using this activity as the starting context 52 * @param intents Array of intents defining the activities that will be started. The element 53 * length-1 will correspond to the top activity on the resulting task stack. 54 * @return true if the underlying API was available and the call was successful, false otherwise 55 */ 56 public static boolean startActivities(Context context, Intent[] intents) { 57 return startActivities(context, intents, null); 58 } 59 60 /** 61 * Start a set of activities as a synthesized task stack, if able. 62 * 63 * <p>In API level 11 (Android 3.0/Honeycomb) the recommended conventions for 64 * app navigation using the back key changed. The back key's behavior is local 65 * to the current task and does not capture navigation across different tasks. 66 * Navigating across tasks and easily reaching the previous task is accomplished 67 * through the "recents" UI, accessible through the software-provided Recents key 68 * on the navigation or system bar. On devices with the older hardware button configuration 69 * the recents UI can be accessed with a long press on the Home key.</p> 70 * 71 * <p>When crossing from one task stack to another post-Android 3.0, 72 * the application should synthesize a back stack/history for the new task so that 73 * the user may navigate out of the new task and back to the Launcher by repeated 74 * presses of the back key. Back key presses should not navigate across task stacks.</p> 75 * 76 * <p>startActivities provides a mechanism for constructing a synthetic task stack of 77 * multiple activities. If the underlying API is not available on the system this method 78 * will return false.</p> 79 * 80 * @param context Start activities using this activity as the starting context 81 * @param intents Array of intents defining the activities that will be started. The element 82 * length-1 will correspond to the top activity on the resulting task stack. 83 * @param options Additional options for how the Activity should be started. 84 * See {@link android.content.Context#startActivity(Intent, Bundle) 85 * @return true if the underlying API was available and the call was successful, false otherwise 86 */ 87 public static boolean startActivities(Context context, Intent[] intents, 88 Bundle options) { 89 final int version = Build.VERSION.SDK_INT; 90 if (version >= 16) { 91 ContextCompatJellybean.startActivities(context, intents, options); 92 return true; 93 } else if (version >= 11) { 94 ContextCompatHoneycomb.startActivities(context, intents); 95 return true; 96 } 97 return false; 98 } 99} 100