Android之判断是否有网封装类

                 我们做项目的时候，一般都不能离开网络，下面是对判断是否有网类的封装

import android.content.Context;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.net.wifi.WifiInfo;import android.net.wifi.WifiManager;import android.widget.Toast;public class NetState {public final static int CONNECTION_NO      = 0; //无网络连接public static final int CONNECTION_HOME    = 1;//内网中wifipublic final static int CONNECTION_OUTSIDE = 2;//外网中wifi或使用移动数据//检查网络状态public static int checkState(Context context){int state = CONNECTION_NO;ConnectivityManager connectivityManager= (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);if(connectivityManager!=null){NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();if(networkInfo!=null&&networkInfo.isAvailable()&&networkInfo.isConnected()){if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {WifiManager wifiManager =(WifiManager)context.getSystemService(Context.WIFI_SERVICE);WifiInfo wifiInfo = wifiManager.getConnectionInfo();//wifiInfo.getBSSID().equals(wifiMac);state = CONNECTION_HOME;}else {state =CONNECTION_OUTSIDE;}}} return state;}/** * 判断是否有网络 */@SuppressWarnings("deprecation")public static boolean IfNet(Context context){switch (NetState.checkState(context)) {case NetState.CONNECTION_NO:Toast.makeText(context, "网络断了哦,检查一下您的网络吧", Toast.LENGTH_SHORT).show();return true;default:break;}return false;}public static String getLocalMacAddress(Context context) {          WifiManager wifi = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);          WifiInfo info = wifi.getConnectionInfo();          return info.getMacAddress();      }      public static boolean isWifi(Context context) {              try {              WifiManager wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);              return (wm!=null && WifiManager.WIFI_STATE_ENABLED == wm.getWifiState());          } catch (Exception e) {                   }          return false;      }  }

还有一些其它的可以参考下

public class NetworkDetector {     public static boolean detect(Activity act) {             ConnectivityManager manager = (ConnectivityManager) act              .getApplicationContext().getSystemService(                     Context.CONNECTIVITY_SERVICE);             if (manager == null) {           return false;       }             NetworkInfo networkinfo = manager.getActiveNetworkInfo();             if (networkinfo == null || !networkinfo.isAvailable()) {           return false;       }        return true;    }} 这个类只有一个静态方法，用来检测当前系统的网络是否可用。如果可用，返回true。还要进一步说明的是，NetworkInfo类中有一个方法getType()，这个方法可以用来判断当前可用的网络是wifi，还是mobile等等。 再来看使用的例子。 view plaincopy to clipboardprint?boolean networkState = NetworkDetector.detect(XXXActivity.this);   if (!networkState) {       DialogUtil.openMsgDialog(XXXActivity.this,              android.R.drawable.ic_dialog_info,              “网络不可用，是否现在设置网络？”, android.R.string.ok,              android.R.string.cancel,              new DialogInterface.OnClickListener() {                 @Override                public void onClick(DialogInterface dialog, int which) {                     startActivityForResult(new Intent(                            ACTION_WIRELESS_SETTINGS), 0);                 }              }, new DialogInterface.OnClickListener() {                 @Override                public void onClick(DialogInterface dialog, int which) {                     dialog.cancel();                 }              }).show();   }         boolean networkState = NetworkDetector.detect(XXXActivity.this);       if (!networkState) {           DialogUtil.openMsgDialog(XXXActivity.this,                  android.R.drawable.ic_dialog_info,                  “网络不可用，是否现在设置网络？”, android.R.string.ok,                  android.R.string.cancel,                  new DialogInterface.OnClickListener() {                     @Override                     public void onClick(DialogInterface dialog, int which) {                         startActivityForResult(new Intent(                                ACTION_WIRELESS_SETTINGS), 0);                     }                  }, new DialogInterface.OnClickListener() {                     @Override                     public void onClick(DialogInterface dialog, int which) {                         dialog.cancel();                     }                  }).show();       }