网络连接的判断及网络类型的判断

//这是一个方法
public void checkMobileNet() {

// 1.得到系统服务ConnectivityManager
ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
// 2.得到网络信息类对象
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
// 3.进行判断
if (networkInfo != null && networkInfo.isConnected()) {
Toast.makeText(this, "已连接互联网!", 0).show();

// 检测手机的网络类型
int type = networkInfo.getType();// 得到网络类型
switch (type) {
case ConnectivityManager.TYPE_WIFI:// wifi网络
Toast.makeText(this, "wifi!", 0).show();
break;
case ConnectivityManager.TYPE_MOBILE:// 移动数据
Toast.makeText(this, "移动数据!", 0).show();
// 2g 3g 4g
getDetailMobileNetType(networkInfo);

break;
}

} else {
Toast.makeText(this, "未连接互联网!", 0).show();

AlertDialog.Builder buider=new AlertDialog.Builder(this);

buider.setTitle("网络连接设置");
buider.setMessage("未连接网络，是否要进行设置？");

buider.setPositiveButton("设置", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface arg0, int arg1) {
//跳转到系统设置网络的界面
Intent intent=new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
startActivity(intent);
}

});
buider.setNegativeButton("取消",  new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface arg0, int arg1) {}

});

buider.create().show();

}
}

//得到详细的网络类型 wap 2G/3G/4G网络**
public void getDetailMobileNetType(NetworkInfo netInfo) {

String strNetworkType = "";
// 得到整数类型
int subtype = netInfo.getSubtype();
// 得到名子
String _strSubTypeName = netInfo.getSubtypeName();

switch (subtype) {
case TelephonyManager.NETWORK_TYPE_GPRS:// 联通2G
case TelephonyManager.NETWORK_TYPE_EDGE:// 移动2G
case TelephonyManager.NETWORK_TYPE_CDMA:// 电信2G
case TelephonyManager.NETWORK_TYPE_1xRTT:
case TelephonyManager.NETWORK_TYPE_IDEN: // api<8 : replace by 11
strNetworkType = "2G";
break;
case TelephonyManager.NETWORK_TYPE_UMTS:
case TelephonyManager.NETWORK_TYPE_EVDO_0:
case TelephonyManager.NETWORK_TYPE_EVDO_A:
case TelephonyManager.NETWORK_TYPE_HSDPA:
case TelephonyManager.NETWORK_TYPE_HSUPA:
case TelephonyManager.NETWORK_TYPE_HSPA:
case TelephonyManager.NETWORK_TYPE_EVDO_B: // api<9 : replace by 14
case TelephonyManager.NETWORK_TYPE_EHRPD: // api<11 : replace by 12
case TelephonyManager.NETWORK_TYPE_HSPAP: // api<13 : replace by 15
strNetworkType = "3G";
break;
case TelephonyManager.NETWORK_TYPE_LTE: // api<11 : replace by 13
strNetworkType = "4G";
break;
default:
// http://baike.baidu.com/item/TD-SCDMA 中国移动 联通 电信 三种3G制式
if (_strSubTypeName.equalsIgnoreCase("TD-SCDMA")
|| _strSubTypeName.equalsIgnoreCase("WCDMA")
|| _strSubTypeName.equalsIgnoreCase("CDMA2000")) {
strNetworkType = "3G";
} else {
strNetworkType = _strSubTypeName;
}

break;

}
Log.d("zzz", "网络类型是：" + strNetworkType);

}

创建一个类将代码赋值进去

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.provider.Settings;

public class WangLuo {
public static boolean isWL(Context context) {

ConnectivityManager manager = (ConnectivityManager)

context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getActiveNetworkInfo();
return (info != null && info.isAvailable());
}

public static void TanKuang(final Context context) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setMessage("网络链接中断,是否设置链接网络");
builder.setNegativeButton("取消", null);
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//                    两种跳转都可以跳转到到设置网络
//                Intent intent = new Intent(Settings.ACTION_WIRELESS_SETTINGS);
Intent intent = new Intent(Settings.ACTION_WIFI_SETTINGS);
//                    intent.setAction("android.settings.WIRELESS_SETTINGS");
context.startActivity(intent);
}
});
builder.create().show();
}

}

///////////////////////////////////////////////
在主方法中将下列代码复制上即可

//调用方法判断是否是联网状态
boolean wl = WangLuo.isWL(this);
//判断是否联网如果没有跳转到网络连接界面连接网络
if (!wl){
WangLuo.TanKuang(this);
}