我必须使用wifi(如果可用)将我的应用程序与服务器连接, 或者gprs(如果wifi不可用)。 这是我检查连接可用性的代码
public static final boolean isConnectionAvailable(Activity a)
{
ConnectivityManager cm = (ConnectivityManager)a.getSystemService(Context.CONNECTIVITY_SERVICE);
State mobile = cm.getNetworkInfo(0).getState();
State wifi = cm.getNetworkInfo(1).getState();
if (wifi == NetworkInfo.State.CONNECTED || wifi == NetworkInfo.State.CONNECTING)
{
return true;
}
if (mobile == NetworkInfo.State.CONNECTED || mobile == NetworkInfo.State.CONNECTING)
{
return true;
}
return false;
}
这是正确的方法吗?谁能建议我一个更好的方法?
答案 0 :(得分:9)
以下非常类似的方法可行,但具有不关心底层媒体的额外优势,因为它看起来好像不仅仅支持WiFi。也许这些也被手机覆盖,但文档并不是非常明确:
// added as an instance method to an Activity
boolean isNetworkConnectionAvailable() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
if (info == null) return false;
State network = info.getState();
return (network == NetworkInfo.State.CONNECTED || network == NetworkInfo.State.CONNECTING);
}
答案 1 :(得分:0)
网络可用性检查:
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
答案 2 :(得分:0)
或者你可以使用一些 kotlin 实现
fun Context.isNetworkAvailable(): Boolean {
val cm = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
val activeNetwork: NetworkInfo? = cm.activeNetworkInfo
return activeNetwork?.isConnectedOrConnecting == true
}