Android仿QQ微信实时监测网络状态

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

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;  }  } 

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);  } } 

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;  }  } 

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");   }  }  } 

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