Android中判断网络连接的工具类

在android中开发具有网络交互的应用时，必须用到的工具类NetUtil
package com.example.test;import android.app.Activity;import android.app.AlertDialog;import android.content.Context;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;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;elsereturn false;} catch (Exception e) {e.printStackTrace();return false;}}}
需要时直接加入自己的项目中就好了，很实用的工具类。
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