2012-09-11 14:411230人阅读评论(4)收藏举报
- 在开发Andorid程序的时候,难免会牵扯到退出整个应用程序的情况,怎么完全退出呢?请参阅下面的关键代码:
- import java.util.LinkedList;
- import java.util.List;
- import Android.app.Activity;
- import Android.app.AlertDialog;
- import Android.app.Application;
- import Android.content.DialogInterface;
- import Android.content.Intent;
- public class SysApplication
extends Application { - private List<Activity> mList =
new LinkedList<Activity>(); - private static SysApplication instance;
- private SysApplication() {
- }
- public synchronized
static SysApplication getInstance() {
- if (null == instance) {
- instance = new SysApplication();
- }
- return instance;
- }
- // add Activity
- public void addActivity(Activity activity) {
- mList.add(activity);
- }
- public void exit() {
- try {
- for (Activity activity : mList) {
- if (activity !=
null) - activity.finish();
- }
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- System.exit(0);
- }
- }
- @Override
- public void onLowMemory() {
- super.onLowMemory();
- System.gc();
- }
- }
在每个Activity的onCreate方法中添加类似代码:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SysApplication.getInstance().addActivity(this);
}
在需要退出程序的时候,调用:
SysApplication.getInstance().exit();
简而言之,通过单例模式把每个Activity 的引用添加到一个全局链表中,每次退出程序调用System.exit(0)时,先调用链表中Activity 的finish方法。