android - 如何防止webview加载时没有互联网连接 [英] android - how to prevent webview to load when no internet connection

问题描述

我有一个具有网络视图的Android应用。当没有互联网连接时，webview将显示页面不可用。我想让它看起来像一个应用程序尽可能多，所以我不想显示此页面。我发现一些有用的信息在线教你如何隐藏或加载别的东西覆盖它，但我真正想要的是留在当前页面，一个弹出对话框说没有连接。基本上，当用户点击webview中的任何内容时，首先检查连接。

I have an Android app which has a webview. When there's no internet connection, webview will display page not available. I want to make this look like an app as much as possible, so I don't want to display this page. I found some useful info online teaching you how to hide or load something else to cover it, but what I really want is to stay at the current page and a little pop up dialog says no connection. Basically, when user clicks on anything inside the webview, check for connection first. if no connection, stay at where it was and pop out a dialog box.

感谢您的帮助！

已编辑：

像我说的，我已经知道如何从在线样品检查互联网连接。我的问题是我不知道如何停止加载下一页。要清楚，当用户尝试去下一页，检查互联网连接。如果没有连接，页面将保持在它的位置，不会去到下一页。我希望用户能够看到他们上次加载的网页，并在网页内容仍然存在时获得通知。感谢！

Like I said, I already know how to check internet connection from the samples online. My problem is I don't know how to stop loading the next page. To be clear, when users try to go to the next page, check for internet connection. If no connection, the page will stay at where it was and would not go to the next page. I want users able to see their last loaded page and get informed while webpage content is still there. thanks!

推荐答案

我在我的项目中使用了以下内容：

I have used the following in my projects:

DetectConnection.Java

import android.content.Context;
import android.net.ConnectivityManager;


public class DetectConnection {             
  public static boolean checkInternetConnection(Context context) {   

    ConnectivityManager con_manager = (ConnectivityManager) 
      context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (con_manager.getActiveNetworkInfo() != null
        && con_manager.getActiveNetworkInfo().isAvailable()
        && con_manager.getActiveNetworkInfo().isConnected()) {
      return true;
    } else {
      return false;
    }
  }
}

if (!DetectConnection.checkInternetConnection(this)) {
  Toast.makeText(getApplicationContext(), "No Internet!", Toast.LENGTH_SHORT).show();
} else {      
  wv = (WebView) findViewById(R.id.donate_webView1);
  c = new CustomWebViewClient();
  wv.setWebViewClient(c);
  wv.clearCache(true);
  wv.clearHistory();
  wv.getSettings().setJavaScriptEnabled(true);
  wv.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
  wv.getSettings().setBuiltInZoomControls(true);
  wv.loadUrl("http://www.google.com");
}


// Function to load all URLs in same webview
private class CustomWebViewClient extends WebViewClient {
  public boolean shouldOverrideUrlLoading(WebView view, String url) {
    if (!DetectConnection.checkInternetConnection(this)) {
      Toast.makeText(getApplicationContext(), "No Internet!", Toast.LENGTH_SHORT).show();
    } else {
      view.loadUrl(url);
    }     
    return true;
  }
}

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