退出多個activity的方法，退出多個activity

退出多個activity的方法，退出多個activity
1.使用List集合方式

用list儲存activity執行個體，然後逐一幹掉

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 Activitypublic 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             }}@Overridepublic 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域鏈表中，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執行個體：

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-onPause08-09 15:33:49.279 26919-26919/example.com.closeapp I/tag: MainActivity-onStop08-09 15:33:51.569 26919-26959/example.com.closeapp D/OpenGLRenderer: endAllStagingAnimators on 0x55850598b0 (RippleDrawable) with handle 0x558504151008-09 15:33:56.079 26919-26919/example.com.closeapp I/tag: MainActivity-onDestroy08-09 15:33:56.089 26919-26919/example.com.closeapp I/tag: ActivityB-onDestroy08-09 15:33:56.399 26919-26919/example.com.closeapp I/tag: ActivityC-onDestroy