Android仿QQ微信实时监测网络状态

先简单说一下思路：网络变化时系统会发出广播。所以我们监听这个广播，利用接口回调通知activity做相应的操作就好了。

思路

• 判断网络状态（写个工具类NetUtil）
• 写个类继承BroadcastReceiver（不要忘记在清单文件中注册）
• 需要在清单文件中添加权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE">
</uses-permission>

• 回调接口（NetEvevt）
• BaseActivity实现这个接口

直接上代码

NetUtil

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo; 

/**
 * Author: lenovo
 * Date: 2018/2/26
 * email: 1271396448@qq.com
 */ 

public class NetUtil { 

 /**
  * 没有连接网络
  */
 public static final int NETWORK_NONE = -1;
 /**
  * 移动网络
  */
 public static final int NETWORK_MOBILE = 0;
 /**
  * 无线网络
  */
 public 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;
 } 

} 

NetBroadReceiver

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager; 

/**
 * Author: lenovo
 * Date: 2018/2/26
 * email: 1271396448@qq.com
 */ 

public class NetBroadcastReceiver extends BroadcastReceiver {
 public NetEvevt evevt = BaseActivity.evevt; 

 @Override
 public void onReceive(Context context, Intent intent) {
  // TODO Auto-generated method stub
  // 如果相等的话就说明网络状态发生了变化
  if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
   int netWorkState = NetUtil.getNetWorkState(context);
   // 接口回调传过去状态的类型
   evevt.onNetChange(netWorkState);
  }
 } 

 // 自定义接口
 public interface NetEvevt {
  public void onNetChange(int netMobile);
 }
}

BaseActivity

import android.os.Bundle;
import android.support.v4.app.FragmentActivity; 

/**
 * Author: lenovo
 * Date: 2018/2/26
 * email: 1271396448@qq.com
 */ 

abstract public class BaseActivity extends FragmentActivity implements NetBroadcastReceiver.NetEvevt { 

 public static NetBroadcastReceiver.NetEvevt evevt;
 /**
  * 网络类型
  */
 private int netMobile; 

 @Override
 protected void onCreate(Bundle arg0) {
  // TODO Auto-generated method stub
  super.onCreate(arg0);
  evevt = this;
  inspectNet();
 } 

 /**
  * 初始化时判断有没有网络
  */ 

 public boolean inspectNet() {
  this.netMobile = NetUtil.getNetWorkState(BaseActivity.this);
  return isNetConnect(); 

  // if (netMobile == 1) {
  // System.out.println("inspectNet：连接wifi");
  // } else if (netMobile == 0) {
  // System.out.println("inspectNet:连接移动数据");
  // } else if (netMobile == -1) {
  // System.out.println("inspectNet:当前没有网络");
  //
  // }
 } 

 /**
  * 网络变化之后的类型
  */
 @Override
 public void onNetChange(int netMobile) {
  // TODO Auto-generated method stub
  this.netMobile = netMobile;
  isNetConnect(); 

 } 

 /**
  * 判断有无网络 。
  *
  * @return true 有网, false 没有网络.
  */
 public boolean isNetConnect() {
  if (netMobile == 1) {
   return true;
  } else if (netMobile == 0) {
   return true;
  } else if (netMobile == -1) {
   return false; 

  }
  return false;
 } 

} 

MainActivity

import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.TextView; 

public class MainActivity extends BaseActivity { 

 private TextView textView,txtView;
 ListView listView; //声明一个ListView对象 

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  textView= (TextView) findViewById(R.id.textView);
  txtView=(TextView)this.findViewById(R.id.txtView); 

  //启动时判断网络状态
  boolean netConnect = this.isNetConnect();
  if (netConnect){
   textView.setVisibility(View.GONE);
   txtView.setText("网络连接正常");
  }else {
   textView.setVisibility(View.VISIBLE);
   txtView.setText("网络连接异常");
  }
 } 

 @Override
 public void onNetChange(int netMobile) {
  super.onNetChange(netMobile);
  //网络状态变化时的操作
  if (netMobile==NetUtil.NETWORK_NONE){
   textView.setVisibility(View.VISIBLE);
   txtView.setText("网络连接异常");
  }else {
   textView.setVisibility(View.GONE);
   txtView.setText("网络连接正常");
  }
 } 

} 

记得在清单文件中注册

<receiver android:name="cn.broadcastreceiver.NetBroadcastReceiver" >
 <intent-filter>
  <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
 </intent-filter>
</receiver> 

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