退出多个activity的方法

1.使用List集合方式

用list保存activity实例，然后逐一干掉

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);//去掉这个
             }
}

@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　

优点：实现简单，逻辑清晰

2.使用广播

推荐！！好方便！！

基本逻辑就是：定义一个BaseActivity，在这个Activity中绑定广播，在广播的onReceive方法中调用finish();然后以后的Activity都继承这个Activity，退出时发送广播，退出BaseActivity，父activity都退出了，子activity肯定退出。

代码如下：

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;

public class BaseActivity extends AppCompatActivity {

    protected BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            finish();
        }
    };

    @Override
    public void onResume() {
        super.onResume();
        // 在当前的activity中注册广播
        IntentFilter filter = new IntentFilter();
        filter.addAction("ExitApp");
        this.registerReceiver(this.broadcastReceiver, filter);
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy(); //解除绑定
        this.unregisterReceiver(this.broadcastReceiver);
    }

}

　　一个Activity实例：

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class ActivityC extends BaseActivity {

    Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_activity_c);
        SysApplication.getInstance().addActivity(this);
        btn = (Button) findViewById(R.id.acticityc_btn);
        //关闭所有的activity
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

            }
        });

    }
    /**
     * 捕获手机物理菜单键
     */
    private long exitTime = 0;

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK){//&& event.getAction() == KeyEvent.ACTION_DOWN
            if((System.currentTimeMillis()-exitTime) > 2000){
                Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show();
                exitTime = System.currentTimeMillis();
            } else {
                myExit();
            }
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    protected void myExit() {
        //第二种退出方法
       // SysApplication.getInstance().exit();
        Intent intent = new Intent();
        intent.setAction("ExitApp");
        this.sendBroadcast(intent);
        //super.finish();
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.i("tag","ActivityC-onStop");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.i("tag","ActivityC-onDestroy");
    }
}

　　就是在退出的地方调用这个：

private long exitTime = 0;

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK){//&& event.getAction() == KeyEvent.ACTION_DOWN
            if((System.currentTimeMillis()-exitTime) > 2000){
                Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show();
                exitTime = System.currentTimeMillis();
            } else {
                myExit();
            }
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    protected void myExit() {
        //第二种退出方法
       // SysApplication.getInstance().exit();
        Intent intent = new Intent();
        intent.setAction("ExitApp");
        this.sendBroadcast(intent);
        //super.finish();
    }

　　优点：方便，方便！！只需要在退出的地方发送广播就可以！！

这是我的退出时的输出：

08-09 15:33:48.869 26919-26919/example.com.closeapp I/tag: MainActivity-onPause
08-09 15:33:49.279 26919-26919/example.com.closeapp I/tag: MainActivity-onStop
08-09 15:33:51.569 26919-26959/example.com.closeapp D/OpenGLRenderer: endAllStagingAnimators on 0x55850598b0 (RippleDrawable) with handle 0x5585041510
08-09 15:33:56.079 26919-26919/example.com.closeapp I/tag: MainActivity-onDestroy
08-09 15:33:56.089 26919-26919/example.com.closeapp I/tag: ActivityB-onDestroy
08-09 15:33:56.399 26919-26919/example.com.closeapp I/tag: ActivityC-onDestroy