使用本地广播

概述MainActivity中的代码，要先导入架包    packagecom.example.broadcasttest;importandroidx.appcompat.app.AppCompatActivity;importandroid.content.BroadcastReceiver;importandroid.content.Context;importandroid.content.Intent;importandroid.content

MainActivity中的代码，要先导入架包

 

 

 

 

package com.example.broadcasttest;@R_419_5565@ androIDx.appcompat.app.AppCompatActivity;@R_419_5565@ androID.content.broadcastReceiver;@R_419_5565@ androID.content.Context;@R_419_5565@ androID.content.Intent;@R_419_5565@ androID.content.IntentFilter;@R_419_5565@ androID.net.ConnectivityManager;@R_419_5565@ androID.net.NetworkInfo;@R_419_5565@ androID.os.Bundle;@R_419_5565@ androID.vIEw.VIEw;@R_419_5565@ androID.Widget.button;@R_419_5565@ androID.Widget.Toast;@R_419_5565@ androIDx.localbroadcastmanager.content.LocalbroadcastManager;public class MainActivity extends AppCompatActivity {    private IntentFilter intentFilter;    private LocalReceiver localReceiver;    private LocalbroadcastManager localbroadcastManager;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        localbroadcastManager=LocalbroadcastManager.getInstance(this);        button button=(button) findVIEwByID(R.ID.button);        button.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw v) {                Intent intent=new Intent("com.example.broadcasttest.LOCAL_broADCAST");                localbroadcastManager.sendbroadcast(intent);                //sendbroadcast(intent);                //sendOrderedbroadcast(intent,null);            }        });        intentFilter=new IntentFilter();        intentFilter.addAction("com.example.broadcasttest.LOCAL_broADCAST");        localReceiver=new LocalReceiver();        localbroadcastManager.registerReceiver(localReceiver,intentFilter);    }    @OverrIDe    protected voID onDestroy(){        super.onDestroy();        localbroadcastManager.unregisterReceiver(localReceiver);        //unregisterReceiver(networkChangeReceiver);    }    class LocalReceiver extends broadcastReceiver{        @OverrIDe        public voID onReceive(Context context,Intent intent){            Toast.makeText(context,"received local broadcast",Toast.LENGTH_SHORT).show();        }    }    /*class NetworkChangeReceiver extends broadcastReceiver{        @OverrIDe        public voID onReceive(Context context, Intent intent){            ConnectivityManager connectionManager=(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);            NetworkInfo networkInfo=connectionManager.getActiveNetworkInfo();            if (networkInfo!=null&&networkInfo.isAvailable()){                Toast.makeText(context,"network is available",Toast.LENGTH_SHORT).show();            }            else{                Toast.makeText(context,"network is unavailable",Toast.LENGTH_SHORT).show();            }        }    }*/}

首先通过LocalbroadcastManager的getInstance()方法得到了它的一个实例，如何在注册广播接收器的时候调用LocalbroadcastManager的registerReceiver()方法，在发送广播的时候调用LocalbroadcastManager的sendbroadcast()方法。我们在按钮的点击事件里面发出了一条com.example.broadcasttest.LOCAL_broADCAST广播，然后在LocalReceiver里去接收这条广播。

运行结果如下图

 

总结

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