[置顶] ActivityGroup自我堆栈管理（复用现有activity）

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package com.dczs.activity;import java.util.Stack;import android.app.Activity;import android.app.ActivityGroup;import android.util.Log;import android.view.KeyEvent;public class BackStackActivityGroup extends ActivityGroup {private static final String TAG = "BackStackActivityGroup";private AcitivityStack mActivityStack = new AcitivityStack();public interface IActivityStack {void add(ActivityStatus name);void remove(String name);void pop();}public void onStackChange(AcitivityStack stack) {}public class AcitivityStack implements IActivityStack {public Stack<ActivityStatus> mStack = new Stack<ActivityStatus>();@Overridepublic void add(ActivityStatus activityStackItem) {mStack.add(activityStackItem);onStackChange(this);}@Overridepublic void remove(String name) {ActivityStatus theItem = null;for (ActivityStatus item : mStack) {if (item.name == name) {theItem = item;break;}}if (theItem != null) {mStack.remove(theItem);if (mStack.size() > 0) {mStack.peek().run();} else {getApplication().onTerminate();}}onStackChange(this);}@Overridepublic void pop() {mStack.pop();if (mStack.size() > 0) {mStack.peek().run();} else {getApplication().onTerminate();}onStackChange(this);}public int size() {return mStack.size();}public String peek() {if (mStack.size() > 0 && mStack.peek() != null) {return mStack.peek().name;} else {return null;}}}public class ActivityStatus {private IActivityStack mActivityStack;private String name = "";private boolean mAddToStack = false;private Runnable runnable;private Activity activity;private ActivityStatus(IActivityStack activityStack) {mActivityStack = activityStack;}public void setRunnable(Runnable runnable) {this.runnable = runnable;}public void setName(String name) {this.name = name;}public ActivityStatus() {}public void addToBackStack() {mAddToStack = true;}public void run() {runnable.run();activity = getLocalActivityManager().getActivity(name);}public void commit() {if (mAddToStack) {mActivityStack.add(this);}runnable.run();activity = getLocalActivityManager().getActivity(name);}};public ActivityStatus startTransaction() {return new ActivityStatus(mActivityStack);}public AcitivityStack getActivityStack() {return mActivityStack;}/** * Back event should not directly dispatch to the child views. Because when * back key event dispatch to this activity's child views, if any of a child * activity's sub views is taking focus. the child activity's * {@link DecorView} will receive the event, and dispatch back key event to * the child activity and call the child activity's onBackPressed method, * this activity's onBackPressed will not be called. This activity's * onBackPressed event will depend on the child activity's views' focus * change. *  * @see {@link #onGlobalFocusChanged}. */@Overridepublic boolean dispatchKeyEvent(KeyEvent event) {Log.d(TAG, "dispatchKeyEvent... new ");if (event.getKeyCode() != KeyEvent.KEYCODE_BACK) {super.dispatchKeyEvent(event);} else {if (event.getAction() == KeyEvent.ACTION_UP) {onBackPressed();}}return true;}@Overridepublic void onBackPressed() {Log.d(TAG, "onBackPressed... new ");Activity activity = getLocalActivityManager().getActivity(mActivityStack.peek());activity.onBackPressed();}@Overridepublic void finishFromChild(Activity child) {// TODO Auto-generated method stubLog.d(TAG, "finishFromChild... new ");for (ActivityStatus item : mActivityStack.mStack) {Activity activity = getLocalActivityManager().getActivity(item.name);if (activity == child) {// handled the finish command.Log.d(TAG, "finishFromChild... is Finishing is true");AcitivityStack stack = getActivityStack();stack.remove(item.name);}}}}