退出多個activity的方法

1.使用List集合方式

用list保存activity實例，然後逐一干掉

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);//去掉這個
             }
}

@Override
public void onLowMemory() {
    super.onLowMemory();
      System.gc();
}

}
在每個Activity的onCreate方法中添加類似代碼：
       public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            SysApplication.getInstance().addActivity(this);
        }

　　在需要退出程式的時候，調用：

SysApplication.getInstance().exit();

 簡而言之，通過單例模式把每個Activity 的引用添加到一個全局鏈表中，每次退出程式調用System.exit(0)時，先調用鏈表中Activity 的finish方法　

 優點：實現簡單，邏輯清晰

2.使用廣播

推薦！！好方便！！

基本邏輯就是：定義一個BaseActivity，在這個Activity中綁定廣播，在廣播的onReceive方法中調用finish();然後以後的Activity都繼承這個Activity，退出時發送廣播，退出BaseActivity，父activity都退出了，子activity肯定退出。

代碼如下：

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();
        // 在當前的activity中註冊廣播
        IntentFilter filter = new IntentFilter();
        filter.addAction("ExitApp");
        this.registerReceiver(this.broadcastReceiver, filter);
    }

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

}

　　一個Activity實例：

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);
        //關閉所有的activity
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

            }
        });

    }
    /**
     * 捕獲手機物理菜單鍵
     */
    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(), "再按一次退出程式", Toast.LENGTH_SHORT).show();
                exitTime = System.currentTimeMillis();
            } else {
                myExit();
            }
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    protected void myExit() {
        //第二種退出方法
       // 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");
    }
}

　　就是在退出的地方調用這個：

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(), "再按一次退出程式", Toast.LENGTH_SHORT).show();
                exitTime = System.currentTimeMillis();
            } else {
                myExit();
            }
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    protected void myExit() {
        //第二種退出方法
       // SysApplication.getInstance().exit();
        Intent intent = new Intent();
        intent.setAction("ExitApp");
        this.sendBroadcast(intent);
        //super.finish();
    }

　　優點：方便，方便！！只需要在退出的地方發送廣播就可以！！

這是我的退出時的輸出：

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