无法检查 Internet 可用

Question

我正在开发一个具有网络视图的 android 应用程序。当我想在显示默认消息之前检查 Internet 是否可用时，问题就来了。我研究了这些链接 Link1and link2。我很困惑如何做到这一点。这是我的代码

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Web= findViewById(R.id.webview);
    Web.getSettings().setJavaScriptEnabled(true);
    Web.loadUrl("http://yourconsenthomebuilders.com/app/clients");
}

Answer 1

使用此方法检查互联网连接

public class ConnectionDetector {

    public ConnectionDetector() {
    }

    public Boolean check_internet(Context context) {
        if (context != null) {
            ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
            if (activeNetwork != null) { // connected to the internet
                if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI || activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                    return true;
                }
            }
        }
        return false;
    }
}

之后您可以像这样创建对象并检查互联网连接

片段

ConnectionDetector connectionDetector = new ConnectionDetector();
connectionDetector.check_internet(getContext())

Activity

ConnectionDetector connectionDetector = new ConnectionDetector();
connectionDetector.check_internet(this)

Answer 2

setContentView() 之后添加此逻辑

ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();

    if (info != null && info.isAvailable() && info.isConnected())
    {
        //network connected
        //show web view logic here
    }else{
        //network not connected
        //show alerts to users
    }

无法检查 Internet 可用

Unable to check the Internet Available

java

url

android

android-webview

android-studio