多个activity一次退出

因为android的API中没有提供一次性退出的接口所以想要在多activity的程序里面一次性退出的话就要费点功夫了。我是在一个单例对象里面记录activity栈中activity的引用然后在需要退出时遍历一遍finish()掉就可以了。实现步骤如下：

1、创建一个单例对象

package com.exit;

import java.lang.ref.SoftReference;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map.Entry;

import android.app.Activity;

import android.content.Context;

import android.content.Intent;

public class ActivityManager {

private Context context;

private static ActivityManager activityManager;

public static ActivityManager getActivityManager(Context context){

if(activityManager == null){

activityManager = new ActivityManager(context);

}

return activityManager;

}

private ActivityManager(Context context){

this.context = context;

}

/**

* task map，用于记录activity栈，方便退出程序（这里为了不影响系统回收activity，所以用软引用）

*/

private final HashMap<String, SoftReference<Activity>> taskMap = new HashMap<String, SoftReference<Activity>>();

/**

* 往应用task map加入activity

*/

public final void putActivity(Activity atv) {

taskMap.put(atv.toString(), new SoftReference<Activity>(atv));

}

/**

* 往应用task map加入activity

*/

public final void removeActivity(Activity atv) {

taskMap.remove(atv.toString());

}

/**

* 清除应用的task栈，如果程序正常运行这会导致应用退回到桌面

*/

public final void exit() {

for (Iterator<Entry<String, SoftReference<Activity>>> iterator = taskMap.entrySet().iterator(); iterator.hasNext();) {

SoftReference<Activity> activityReference = iterator.next().getValue();

Activity activity = activityReference.get();

if (activity != null) {

activity.finish();

}

}

taskMap.clear();

}

}

2、创建自己的根activity，重写onCreate与onDestory

package com.exit;

import android.app.Activity;

import android.os.Bundle;

public class BaseActivity extends Activity {

private ActivityManager manager = ActivityManager.getActivityManager(this);

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

manager.putActivity(this);

}

@Override

protected void onDestroy() {

super.onDestroy();

manager.removeActivity(this);

}

public void exit(){

manager.exit();

}

}

3、以后创建的activity都继承这个根activity就可以了，如下：

package com.exit.activitys;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

import com.exit.BaseActivity;

import com.exit.R;

public class ExitActivity extends BaseActivity implements OnClickListener{

private Button start;

private Button exit;

private TextView tipTV;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

start = (Button)findViewById(R.id.start_new_activity);

exit = (Button)findViewById(R.id.exit_all_activity);

tipTV = (TextView)findViewById(R.id.tip_tv);

tipTV.setText("activity:"+this.toString());

start.setOnClickListener(this);

exit.setOnClickListener(this);

}

@Override

public void onClick(View v) {

if(v == start){

Intent intent = new Intent(this , ExitActivity.class);

startActivity(intent);

}else if(v == exit){

exit();

}

}

}

最后是布局文件

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<TextView

android:id = "@+id/tip_tv"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

<Button android:text="启动新的activity" android:id="@+id/start_new_activity"

android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>

<Button android:text="一次性退出" android:id="@+id/exit_all_activity"

android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>

</LinearLayout>