Android广播的使用（自定义广播和本地广播）

1》自定义广播

//定义接收器public class MyBroadcastReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        Toast.makeText(context,"接收我的广播",Toast.LENGTH_LONG).show();    }}

·//注册事件    <receiver        android:name=".MyBroadcastReceiver"//类名        android:enabled="true"        android:exported="true">        <intent-filter>            <action android:name="com.example.broadcasttext.MY_BROADCAST"/>广播名称        </intent-filter>    </receiver>

//定义按钮发送广播

Button button=(Button)findViewById(R.id.b1);button.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View view) {        Intent intent=new Intent("com.example.broadcasttext.MY_BROADCAST");        sendBroadcast(intent);    }});　　

广播在另外的程序上进行接收，默认的发送方式是标准广播，若想发送有序广播，需要一点点修改

MainActivity.java

button.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View view) {        Intent intent=new Intent("com.example.broadcasttext.MY_BROADCAST");        sendBroadcast(intent);        sendOrderedBroadcast(intent,null);    }});

加入这一行代码后广播的接收就有了顺序

注册时候可以设置接收广播的优先级

<receiver    android:name=".MyBroadcastReceiver"    android:enabled="true"    android:exported="true">    <intent-filter android:priority="100">        <action android:name="com.example.broadcasttext.MY_BROADCAST"/>    </intent-filter></receiver>

优先接收到广播后就可以判断是否继续发送广播

public class MyBroadcastReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        Toast.makeText(context,"接收我的广播",Toast.LENGTH_LONG).show();        abortBroadcast();    }}

abortBroadcast();可以截断广播

2》本地广播

上述例子中发送的广播可以被其他程序所接受，这对安全造成了威胁，所以安卓引入了一套本地广播的体制

　　MainActivity.java

package com.example.guangbo;

import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.location.LocationManager;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.net.NetworkRequest;import android.support.v4.content.LocalBroadcastManager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.Toast;

import java.nio.channels.NetworkChannel;

public class MainActivity extends AppCompatActivity {    private IntentFilter intentFilter;    private NetworkChangeReceiver networkChangeReceiver;    //本地广播    private LocalReceiver localReceiver;    private LocalBroadcastManager localBroadcastManager;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //本地广播        localBroadcastManager= LocalBroadcastManager.getInstance(this);

intentFilter=new IntentFilter();        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");        networkChangeReceiver=new NetworkChangeReceiver();        registerReceiver(networkChangeReceiver,intentFilter);        Button button=(Button)findViewById(R.id.b1);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                //本地广播                Intent intent=new Intent("com.example.broadcasttext.LOCAL_BROADCAST");                localBroadcastManager.sendBroadcast(intent);

}        });        //动态注册本地广播        intentFilter=new IntentFilter();        intentFilter.addAction("com.example.broadcasttext.LOCAL_BROADCAST");        localReceiver=new LocalReceiver();        localBroadcastManager.registerReceiver(localReceiver,intentFilter);    }

@Override    protected void onDestroy() {        super.onDestroy();        //本地广播        localBroadcastManager.unregisterReceiver(localReceiver);    }    class NetworkChangeReceiver extends BroadcastReceiver{            @Override            public void onReceive(Context context, Intent intent) {                ConnectivityManager connectivityManager=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);                NetworkInfo networkInfo=connectivityManager.getActiveNetworkInfo();                if(networkInfo!=null&&networkInfo.isAvailable()){                    Toast.makeText(context,"网络可用",Toast.LENGTH_SHORT).show();                }else{                    Toast.makeText(context,"网络不可用",Toast.LENGTH_SHORT).show();                }

}    }    class LocalReceiver extends BroadcastReceiver{        @Override        public void onReceive(Context context, Intent intent) {

Toast.makeText(context,"接收本地广播",Toast.LENGTH_SHORT).show();

}    }}

啊本地广播主要是通过LocalBriadcaseManager来进行管理

原文地址：https://www.cnblogs.com/837634902why/p/10336320.html