Android自定义一个广播接收器BroadcastReceiver监听系统wifi连接

概述

注册一个广播用来接收系统发送的广播，比如：发送或接收到一个短信，用Toast或Notification通知提醒；或者是打开或者断开网络连接，用Toast做出提示。

注册文件

java代码

BroadcastReceiver子类接收系统广播

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.wifi.WifiManager;
import android.widget.Toast;

/**
 * Created by Sy on 2017/1/3 0003.
 */

public class MainReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 监听wifi的打开与关闭，与wifi的连接无关
        if(WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction())){
            int wifiState=intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);
            switch (wifiState) {
                case WifiManager.WIFI_STATE_ENABLED:
                    Toast.makeText(context, "open wifi", Toast.LENGTH_SHORT).show();
                    break;
                case WifiManager.WIFI_STATE_DISABLING:
                    Toast.makeText(context, "close wifi", Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    }
}