android 完全退出应用程序
原文网址:http://www.yoyong.com/archives/199
android退出应用程序会调用android.os.Process.killProcess(android.os.Process.myPid())或是System.exit(0),这只是针对第一个Activity(也就是入口的Activity)时生效。如果有A,B,C三个Activity,而想在B或C中Activity退出,调用上面的方法,往往会销毁当前的Activity返回上一个Activity。当然也可以逐个返回上一个Activity,直到跳转到入口的Activity,最后退出应用程序。但这样比较麻烦,而且逐个返回的体验并不友好。
网上比较流行的方法是定义栈,写一个ExitApplication类,利用单例模式管理Activity,在每个在Activity的onCreate()方法中调用ExitApplication.getInstance().addActivity(this)方法,在退出时调用ExitApplication.getInstance().exit()方法,就可以完全退出应用程序了。
ExitApplication类
代码如下:
- import java.util.LinkedList;
- import java.util.List;
- import android.app.Activity;
- import android.app.Application;
- public class ExitApplication extends Application {
- private List activityList = new LinkedList();
- private static ExitApplication instance;
- private ExitApplication()
- {
- }
- //单例模式中获取唯一的ExitApplication实例
- public static ExitApplication getInstance()
- {
- if(null == instance)
- {
- instance = new ExitApplication();
- }
- return instance;
- }
- //添加Activity到容器中
- public void addActivity(Activity activity)
- {
- activityList.add(activity);
- }
- //遍历所有Activity并finish
- public void exit()
- {
- for(Activity activity:activityList)
- {
- activity.finish();
- }
- System.exit(0);
- }
- }
下面的三个类IndexActivity, BActivity,CActivity是简单的例子,分别是IndexActivity–>BActivity–>CActivity的跳转顺序。在每个Activity类中onCreate()方法中调用ExitApplication.getInstance().addActivity(Activity activity)方法。在任何一个Activity界面退出应用程序时,只要调用ExitApplication.getInstance().exit()方法,就可以在任何一个Activity中完全退出应用程序。
IndexActivity 类源代码:
- import android.app.Activity;
- import android.content.Intent;
- import android.os.Bundle;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- public class IndexActivity extends Activity {
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- Button next=(Button)findViewById(R.id.next_to_b);
- next.setOnClickListener(nextClick);
- Button exit=(Button)findViewById(R.id.exit_main);
- exit.setOnClickListener(exitClick);
- ExitApplication.getInstance().addActivity(this);
- }
- OnClickListener nextClick=new OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- Intent intent=new Intent(IndexActivity.this,BActivity.class);
- startActivity(intent);
- }
- };
- OnClickListener exitClick=new OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- ExitApplication.getInstance().exit();
- }
- };
- }
BActivity 类源代码:
- import android.app.Activity;
- import android.content.Intent;
- import android.os.Bundle;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- public class BActivity extends Activity {
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.b);
- Button next_to_c=(Button)findViewById(R.id.next_to_c);
- next_to_c.setOnClickListener(next_to_cClick);
- Button exit_b=(Button)findViewById(R.id.exit_b);
- exit_b.setOnClickListener(exitClick);
- ExitApplication.getInstance().addActivity(this);
- }
- OnClickListener next_to_cClick=new OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- Intent intent=new Intent(BActivity.this,CActivity.class);
- startActivity(intent);
- }
- };
- OnClickListener exitClick=new OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- ExitApplication.getInstance().exit();
- }
- };
- }
CActivity 类源代码:
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- public class CActivity extends Activity{
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.c);
- Button exit_c=(Button)findViewById(R.id.exit_c);
- exit_c.setOnClickListener(exitClick);
- ExitApplication.getInstance().addActivity(this);
- }
- OnClickListener exitClick=new OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- ExitApplication.getInstance().exit();
- //如果只是调用以下其中的一个方法,并不会完全退出应用
- //android.os.Process.killProcess(android.os.Process.myPid());
- //System.exit(0);
- }
- };
- }
源码下载:ExitActivity.zip
郑重声明:本站内容如果来自互联网及其他传播媒体,其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享,并不代表本站赞同其观点和对其真实性负责,也不构成任何其他建议。