/*
* 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.content.Intent;
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;
}
/**
* Start a set of activities as a synthesized task stack, if able.
*
* <p>In API level 11 (Android 3.0/Honeycomb) the recommended conventions for
* app navigation using the back key changed. The back key's behavior is local
* to the current task and does not capture navigation across different tasks.
* Navigating across tasks and easily reaching the previous task is accomplished
* through the "recents" UI, accessible through the software-provided Recents key
* on the navigation or system bar. On devices with the older hardware button configuration
* the recents UI can be accessed with a long press on the Home key.</p>
*
* <p>When crossing from one task stack to another post-Android 3.0,
* the application should synthesize a back stack/history for the new task so that
* the user may navigate out of the new task and back to the Launcher by repeated
* presses of the back key. Back key presses should not navigate across task stacks.</p>
*
* <p>startActivities provides a mechanism for constructing a synthetic task stack of
* multiple activities. If the underlying API is not available on the system this method
* will return false.</p>
*
* @param activity Start activities using this activity as the starting context
* @param intents Array of intents defining the activities that will be started. The element
* length-1 will correspond to the top activity on the resulting task stack.
* @return true if the underlying API was available and the call was successful, false otherwise
*/
public static boolean startActivities(Activity activity, Intent[] intents) {
if (Build.VERSION.SDK_INT >= 11) {
ActivityCompatHoneycomb.startActivities(activity, intents);
return true;
}
return false;
}
}