使用广播销毁多个Activity

来源：互联网发布：知乎怎么看题主编辑：程序博客网时间：2024/06/05 20:46

由于业务需求，我们有时会碰到这样的问题：有一系列Activity直行流程为，A->B->C-D, B可以返回到A，C可以返回到B，但是从D返回必须直接退出程序，

由于A，B，C可以前进也可以后退，所以单纯的调用finish()方法不行，下面是一种使用广播来实现这个功能。

1，实现一个Service,这个Service能够发送广播。

public class FinishActivityService extends IntentService{public static final String FINISH_ACTIVITY_ACTION = "com.compusassistant.broadcastreceiver.finish";public FinishActivityService() {super("FinishActivityService");}@Overrideprotected void onHandleIntent(Intent intent) {Intent broadcastIntent = new Intent(FINISH_ACTIVITY_ACTION);sendBroadcast(broadcastIntent);}}

2，在A，B，C中都注册一个广播

public class ActivityA extends Activityprivate static final String TAG = "ActivityA";private Context mContext = this;private IntentFilter mIntentFilter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.select_school_activity);mIntentFilter = new IntentFilter(FinishActivityService.FINISH_ACTIVITY_ACTION);registerReceiver(finishActivityReceiver, mIntentFilter);}BroadcastReceiver finishActivityReceiver = new BroadcastReceiver(){@Overridepublic void onReceive(Context context, Intent intent) {finish();}};

<span style="white-space:pre"></span>public void onDestroy(){<span style="font-family: Arial, Helvetica, sans-serif;"></span>

<span style="white-space:pre"></span><pre code_snippet_id="588048" snippet_file_name="blog_20150124_2_5349661" name="code" class="java"><span style="white-space:pre"></span>unregisterReceiver(finishActivityReceiver);

<span style="white-space:pre"></span>}}

3，在D中启动服务

public class MainActivity extends Activity{private static final String TAG = "BaseActivity";private Context mContext = this;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main_activity);startService(new Intent(mContext,FinishActivityService.class));}}

这样，当进入到D后，返回后会直接退出程序了

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