Android NetUtils-跟网络相关的工具类

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NetUtils跟是一个相关的工具类

功能：

1.判断网络是否连接

2.判断是否是wifi连接

3.打开网络设置界面

import android.app.Activity;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.net.ConnectivityManager;import android.net.NetworkInfo;//跟网络相关的工具类public class NetUtils{private NetUtils(){/* cannot be instantiated */throw new UnsupportedOperationException("cannot be instantiated");}/** * 判断网络是否连接 *  * @param context * @return */public static boolean isConnected(Context context){ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);if (null != connectivity){NetworkInfo info = connectivity.getActiveNetworkInfo();if (null != info && info.isConnected()){if (info.getState() == NetworkInfo.State.CONNECTED){return true;}}}return false;}/** * 判断是否是wifi连接 */public static boolean isWifi(Context context){ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);if (cm == null)return false;return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;}/** * 打开网络设置界面 */public static void openSetting(Activity activity){Intent intent = new Intent("/");ComponentName cm = new ComponentName("com.android.settings","com.android.settings.WirelessSettings");intent.setComponent(cm);intent.setAction("android.intent.action.VIEW");activity.startActivityForResult(intent, 0);}}

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