判断当前网络是否有网

public class CommonUtils {


/** 检查是否有网络 */
public static boolean isNetworkAvailable(Context context) {
NetworkInfo info = getNetworkInfo(context);
if (info != null) {
return info.isAvailable();
}
return false;
}


/** 检查是否是WIFI */
public static boolean isWifi(Context context) {
NetworkInfo info = getNetworkInfo(context);
if (info != null) {
if (info.getType() == ConnectivityManager.TYPE_WIFI)
return true;
}
return false;
}


/** 检查是否是移动网络 */
public static boolean isMobile(Context context) {
NetworkInfo info = getNetworkInfo(context);
if (info != null) {
if (info.getType() == ConnectivityManager.TYPE_MOBILE)
return true;
}
return false;
}


private static NetworkInfo getNetworkInfo(Context context) {


ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo();
}


/** 检查SD卡是否存在 */
public static boolean checkSdCard() {
if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED))
return true;
else
return false;
}


}