Android学习之Broadcast的简单使用

本文实例为大家分享了Android学习之Broadcast的使用方法，供大家参考，具体内容如下

实现开机启动提示网络的广播

package com.example.luobo.broadcasttest;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.Toast;public class MainActivity extends AppCompatActivity { private IntentFilter intentFilter; private NetworkChangeReceiver networkChangeReceiver; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  intentFilter = new IntentFilter();//创建一个过滤器实例  intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");//添加接收CONNECTIVITY_CHANGE消息  networkChangeReceiver = new NetworkChangeReceiver();  reGISterReceiver(networkChangeReceiver,intentFilter); } @Override protected void onDestroy() {  super.onDestroy();  unregisterReceiver(networkChangeReceiver); } class NetworkChangeReceiver extends BroadcastReceiver{  @Override  public void onReceive(Context context, Intent intent) {   ConnectivityManager connectivityManager = (ConnectivityManager)     getSystemService(Context.CONNECTIVITY_SERVICE);//通过此方法获取ConnectivityManager实例   NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();//调用实例connectivityManager的getActiveNetworkInfo()方法获取NetworkInfo实例   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();   }  } }}