android通过广播实时监听当前网络状况

检查网络状态的类型

 需要设置权限–允许查看网络状态
   
   public class NetUtil {
/**
 * 没有连接网络
 */
private static final int NETWORK_NONE = -1;
/**
 * 移动网络
 */
private static final int NETWORK_MOBILE = 0;
/**
 * 无线网络
 */
private static final int NETWORK_WIFI = 1;

public static int getNetWorkState(Context context) {
    // 得到连接管理器对象
    ConnectivityManager connectivityManager = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo activeNetworkInfo = connectivityManager
            .getActiveNetworkInfo();
    if (activeNetworkInfo != null && activeNetworkInfo.isConnected()) {

        if (activeNetworkInfo.getType() == (ConnectivityManager.TYPE_WIFI)) {
            return NETWORK_WIFI;
        } else if (activeNetworkInfo.getType() == (ConnectivityManager.TYPE_MOBILE)) {
            return NETWORK_MOBILE;
        }
    } else {
        return NETWORK_NONE;
    }
    return NETWORK_NONE;
}}

创建状态回调接口

  public interface NetEvent {
  void onNetChange(int netMobile);
  }

创建广播接收器

   public class NetBroadcastReceiver extends BroadcastReceiver {

      private NetEvent netEvent;

      @Override
      public void onReceive(Context context, Intent intent) {

          if (intent.getAction()
             .equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
              //检查网络状态的类型
              int netWrokState = NetUtil.getNetWorkState(context);
            if (netEvent != null)
            // 接口回传网络状态的类型
            netEvent.onNetChange(netWrokState);
    }
}
     public void setNetEvent(NetEvent netEvent) {
         this.netEvent = netEvent;
      }
}

在Acitivity中动态注册广播，这里不能静态注册哦

  public class MainActivity extends AppCompatActivity implements NetEvent {

/**
 * 网络状态
 */
private int netMobile;

private TextView mtvNet;

/**
 * 监控网络的广播
 */
private NetBroadcastReceiver netBroadcastReceiver;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mtvNet = (TextView) findViewById(R.id.tv_net);

}

@Override
public void onStart() {
    super.onStart();
    //注册广播
    if (netBroadcastReceiver == null) {
        netBroadcastReceiver = new NetBroadcastReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        registerReceiver(netBroadcastReceiver, filter);
        /**
         * 设置监听
         */
        netBroadcastReceiver.setNetEvent(this);
    }
}

@Override
public void onNetChange(int netMobile) {
    this.netMobile = netMobile;
    isNetConnect();
}
private void isNetConnect() {
    mtvNet.append("\n" + new Date());
    switch (netMobile) {
        case 1://wifi
            mtvNet.append("\n当前网络类型:wifi");
            break;
        case 0://移动数据
            mtvNet.append("\n当前网络类型:移动数据");
            break;
        case -1://没有网络
            mtvNet.append("\n当前无网络");
            break;
    }
    mtvNet.append("\n---------------------------------------------------------");
}
        @Override
        public void onDestroy() {
            super.onDestroy();
            if (netBroadcastReceiver != null) {
            //注销广播
                unregisterReceiver(netBroadcastReceiver);
                      }
                   }   
          }