Android检查网络状态工具类详解

package com.example.ldp.com.util; /**  * Created by Administrator on 2017/4/7.  */  import android.content.Context; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.net.NetworkInfo.State; import android.provider.Settings; import android.util.Log; import android.widget.TextView;  import com.example.ldp.com.forestteaching.R;  /**  * Description :NetUtil为 网络监控类  * Author:ldp  * Data:2017/4/7  */ public class NetUtil {   /**    * 判断网络情况    *    * @param context 上下文    * @return false 表示没有网络 true 表示有网络    */   public static boolean isNetworkAvalible(Context context) {     // 获得网络状态管理器     ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);      if (connectivityManager == null) {       return false;     } else {       // 建立网络数组       NetworkInfo[] net_info = connectivityManager.getAllNetworkInfo();        if (net_info != null) {         for (int i = 0; i < net_info.length; i++) {           // 判断获得的网络状态是否是处于连接状态           if (net_info[i].getState() == NetworkInfo.State.CONNECTED) {             return true;           }         }       }     }     return false;   }    // 如果没有网络，则弹出网络设置对话框   public static void checkNetwork(final Activity activity) {     if (!NetUtil.isNetworkAvalible(activity)) {       TextView msg = new TextView(activity);       msg.setText("当前没有可以使用的网络，请设置网络！");       new AlertDialog.Builder(activity).setIcon(R.drawable.ic_launcher).setTitle("网络状态提示").setView(msg).setPositiveButton("确定", new DialogInterface.OnClickListener() {          public void onClick(DialogInterface dialog, int whichButton) {           // 跳转到设置界面           activity.startActivityForResult(new Intent(Settings.ACTION_WIRELESS_SETTINGS), 0);         }       }).create().show();     }     return;   }    /**    * 判断网络是否连接    **/   public static boolean netState(Context context) {     ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);     // 获取代表联网状态的NetWorkInfo对象     NetworkInfo networkInfo = connManager.getActiveNetworkInfo();     // 获取当前的网络连接是否可用     boolean available = false;     try {       available = networkInfo.isAvailable();     } catch (Exception e) {       e.printStackTrace();       return false;     }     if (available) {       Log.i("通知", "当前的网络连接可用");       return true;     } else {       Log.i("通知", "当前的网络连接可用");       return false;     }   }    /**    * 在连接到网络基础之上,判断设备是否是SIM网络连接    *    * @param context    * @return    */   public static boolean IsMobileNetConnect(Context context) {     try {       ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);       State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();       if (State.CONNECTED == state)         return true;       else         return false;     } catch (Exception e) {       e.printStackTrace();       return false;     }   }  }