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

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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();
   }
  }
 }
}

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