Android：检测网络状态

创建广播接收器：

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

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

        System.out.println("网络状态发生变化");
        //检测API是不是小于23，因为到了API23之后getNetworkInfo(int networkType)方法被弃用
        if (android.os.Build.VERSION.SDK_INT < 23) {
            //获得ConnectivityManager对象
            ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            //获取ConnectivityManager对象对应的NetworkInfo对象
            //获取WIFI连接的信息
            NetworkInfo wifiNetworkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            //获取移动数据连接的信息
            NetworkInfo dataNetworkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
            if (wifiNetworkInfo.isConnected() && dataNetworkInfo.isConnected()) {
                Toast.makeText(context, "WIFI已连接,移动数据已连接", Toast.LENGTH_SHORT).show();
            } else if (wifiNetworkInfo.isConnected() && !dataNetworkInfo.isConnected()) {
                Toast.makeText(context, "WIFI已连接,移动数据已断开", Toast.LENGTH_SHORT).show();
            } else if (!wifiNetworkInfo.isConnected() && dataNetworkInfo.isConnected()) {
                Toast.makeText(context, "WIFI已断开,移动数据已连接", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(context, "WIFI已断开,移动数据已断开", Toast.LENGTH_SHORT).show();
            }
        }else {
            System.out.println("API level 大于23");
            //获得ConnectivityManager对象
            ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

            try{
            	//获取所有网络连接的信息
                NetworkInfo[] networks = connMgr.getAllNetworkInfo();
                //用于存放网络连接信息
                StringBuilder sb = new StringBuilder();
                //通过循环将网络信息逐个取出来
                for (int i=0; i < networks.length; i++){
                    //获取ConnectivityManager对象对应的NetworkInfo对象
                    NetworkInfo networkInfo = networks[i];
                    int type=networkInfo.getType();
                    if(ConnectivityManager.TYPE_MOBILE==type){
                    	sb.append(networkInfo.getTypeName() + " connect is " + networkInfo.isConnected());
                    }else if(ConnectivityManager.TYPE_WIFI==type){
                    	sb.append(networkInfo.getTypeName() + " connect is " + networkInfo.isConnected());
                    }
                }
                Toast.makeText(context, sb.toString(),Toast.LENGTH_LONG).show();
            }
            catch(Exception e){
            	
            }
        }
    }
}

在主activity中注册/取消监听

//在onResume()方法注册
    @Override
    protected void onResume() {
        if (netWorkStateReceiver == null) {
            netWorkStateReceiver = new NetWorkStateReceiver();
        }
        IntentFilter filter = new IntentFilter();
        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        registerReceiver(netWorkStateReceiver, filter);
        System.out.println("注册");
        super.onResume();
    }

    //onPause()方法注销
    @Override
    protected void onPause() {
        unregisterReceiver(netWorkStateReceiver);
        System.out.println("注销");
        super.onPause();
    }

在AndroidManifest.xml进行广播的静态注册 

 

  
      
//检测网络变化的acton
          
          
      
  

添加网络权限