android学习——退出整个应用程序
将下面SysApplication这个类复制到工程里面,然后在每个Acitivity的oncreate方法里面通过SysApplication.getInstance().addActivity(this); 添加当前Acitivity到ancivitylist里面去,最后在想退出的时候调用SysApplication.getInstance().exit();可直接关闭所有的Acitivity并退出应用程序。
package com.example.Emotional.util; import java.util.LinkedList; import java.util.List; import android.app.Activity; import android.app.Application; /** * * 类名称:SysApplication * 类描述: 退出整个应用程序的类 * 创建时间:2014-4-25 下午1:58:00 * 修改备注: * @version * */ 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); } } public void onLowMemory() { super.onLowMemory(); System.gc(); } }
在硬退出按钮点击时
//点击硬退出按钮 public void clickQuitDialog() { AlertDialog.Builder builder = new Builder(FirstActivity.this); builder.setMessage("确定要退出吗?"); // builder.setTitle("提示"); builder.setPositiveButton("确认",new android.content.DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); // FirstActivity.this.finish(); // System.exit(0); SysApplication.getInstance().exit(); } }); builder.setNegativeButton("取消",new android.content.DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); builder.create().show(); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { //event.getRepeatCount() == 0 防止重复点击 if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) { clickQuitDialog(); return false; } return false; }