Android工作学习第5天之Activity的完全退出程序

注：本文大部分为网上转载，本人只是根据工作的需要略做整合！

android 完全退出应用程序

注意：1、单例模式的学习

　　　2、Manifest.xml，注意项目清单文件中要加上

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：

1. import java.util.LinkedList;
2. import java.util.List;
3. import android.app.Activity;
4. import android.app.Application;
5. publicclass ExitApplication extends Application {
6. private List activityList = new LinkedList();
7. privatestatic ExitApplication instance;
8. private ExitApplication()
9. {
10. }
11. //单例模式中获取唯一的ExitApplication实例
12. publicstatic ExitApplication getInstance()
13. {
14. if(null == instance)
15. {
16. instance = new ExitApplication();
17. }
18. return instance;
19. }
20. //添加Activity到容器中
21. publicvoid addActivity(Activity activity)
22. {
23. activityList.add(activity);
24. }
25. //遍历所有Activity并finish
26. publicvoid exit()
27. {
28. for(Activity activity:activityList)
29. {
30. activity.finish();
31. }
32. System.exit(0);
33. }
34. }

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：

1. import android.app.Activity;
2. import android.content.Intent;
3. import android.os.Bundle;
4. import android.view.View;
5. import android.view.View.OnClickListener;
6. import android.widget.Button;
7. publicclass IndexActivity extends Activity {
8. /** Called when the activity is first created. */
9. @Override
10. publicvoid onCreate(Bundle savedInstanceState) {
11. super.onCreate(savedInstanceState);
12. setContentView(R.layout.main);
13. Button next=(Button)findViewById(R.id.next_to_b);
14. next.setOnClickListener(nextClick);
15. Button exit=(Button)findViewById(R.id.exit_main);
16. exit.setOnClickListener(exitClick);
17. ExitApplication.getInstance().addActivity(this);
18. }
19. OnClickListener nextClick=new OnClickListener() {
20. @Override
21. publicvoid onClick(View v) {
22. // TODO Auto-generated method stub
23. Intent intent=new Intent(IndexActivity.this,BActivity.class);
24. startActivity(intent);
25. }
26. };
27. OnClickListener exitClick=new OnClickListener() {
28. @Override
29. publicvoid onClick(View v) {
30. // TODO Auto-generated method stub
31. ExitApplication.getInstance().exit();
32. }
33. };
34. }

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：

1. import android.app.Activity;
2. import android.content.Intent;
3. import android.os.Bundle;
4. import android.view.View;
5. import android.view.View.OnClickListener;
6. import android.widget.Button;
7. publicclass BActivity extends Activity {
8. @Override
9. protectedvoid onCreate(Bundle savedInstanceState) {
10. // TODO Auto-generated method stub
11. super.onCreate(savedInstanceState);
12. setContentView(R.layout.b);
13. Button next_to_c=(Button)findViewById(R.id.next_to_c);
14. next_to_c.setOnClickListener(next_to_cClick);
15. Button exit_b=(Button)findViewById(R.id.exit_b);
16. exit_b.setOnClickListener(exitClick);
17. ExitApplication.getInstance().addActivity(this);
18. }
19. OnClickListener next_to_cClick=new OnClickListener() {
20. @Override
21. publicvoid onClick(View v) {
22. // TODO Auto-generated method stub
23. Intent intent=new Intent(BActivity.this,CActivity.class);
24. startActivity(intent);
25. }
26. };
27. OnClickListener exitClick=new OnClickListener() {
28. @Override
29. publicvoid onClick(View v) {
30. // TODO Auto-generated method stub
31. ExitApplication.getInstance().exit();
32. }
33. };
34. }

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：

1. import android.app.Activity;
2. import android.os.Bundle;
3. import android.view.View;
4. import android.view.View.OnClickListener;
5. import android.widget.Button;
6. publicclass CActivity extends Activity{
7. @Override
8. protectedvoid onCreate(Bundle savedInstanceState) {
9. // TODO Auto-generated method stub
10. super.onCreate(savedInstanceState);
11. setContentView(R.layout.c);
12. Button exit_c=(Button)findViewById(R.id.exit_c);
13. exit_c.setOnClickListener(exitClick);
14. ExitApplication.getInstance().addActivity(this);
15. }
16. OnClickListener exitClick=new OnClickListener() {
17. @Override
18. publicvoid onClick(View v) {
19. // TODO Auto-generated method stub
20. ExitApplication.getInstance().exit();
21. //如果只是调用以下其中的一个方法，并不会完全退出应用
22. //android.os.Process.killProcess(android.os.Process.myPid());
23. //System.exit(0);
24. }
25. };
26. }

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

转载地址：http://www.yoyong.com/archives/199