Android仿QQ微信实时监测网络状态

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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>