这是我的课程,用于检查设备是否连接到互联网。
import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
public class ConnectionDetector {
private Context _context;
public ConnectionDetector(Context context) {
this._context = context;
}
public boolean isConnectingToInternet() {
if (networkConnectivity()) {
try {
HttpURLConnection urlc = (HttpURLConnection) (new URL(
"http://www.google.com").openConnection());
urlc.setRequestProperty("User-Agent", "Test");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(3000);
urlc.setReadTimeout(4000);
urlc.connect();
// networkcode2 = urlc.getResponseCode();
return (urlc.getResponseCode() == 200);
} catch (IOException e) {
return (false);
}
} else
return false;
}
private boolean networkConnectivity() {
ConnectivityManager cm = (ConnectivityManager) _context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = cm.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
return true;
}
return false;
}
}
然后我在这里调用它,但它似乎没有返回 true 或 false。没有错误,我的应用程序没有崩溃,只是没有打印出任何内容。有人知道为什么吗?
public void CheckInternet(){
// Boolean isInternetPresent;
ConnectionDetector cd = new ConnectionDetector(getApplicationContext());
// isInternetPresent = cd.isConnectingToInternet();
if (cd.isConnectingToInternet()) {
// Internet Connection is Present
Log.i(TAG, "INTERNET IS GUUD");
} else {
// Internet connection is not present
// Ask user to connect to Internet
Log.i(TAG, "INTERNET IS NOOOO GUUD");
}
}
创建一个类:
public class Utility {
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivityManager
= (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
}
然后你从 Activity 调用方法,它将返回 true 或 false:
Utility.isNetworkAvailable(AnyActivity.this);
并且不要忘记向 android 清单添加权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
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