java - 通过WebView.goBack执行url

Question

我遇到了以下问题!我解析网站，这是我的大致代码:

public class MainActivity extends Activity {
String CurURL = "";
    @Override
    public void onCreate(Bundle savedInstanceState) {
    webview.setWebViewClient(new ForumWebViewClient());
    new ParseMyPageTask().execute(url);
    }
    private class ForumWebViewClient extends WebViewClient {
    public boolean shouldOverrideUrlLoading(WebView webview, String url) {
        new ParseMyPageTask().execute(url);
        return true;
    }
    }

    public class ParseMyPageTask extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... params) {
                    *JSoup work*
        return result;
            }
    @Override
    protected void onPostExecute(String result) {
            webview.loadDataWithBaseURL("http:..", result, "text/html", "UTF-8", CurURL);
    }
    }
    @Override
public void onBackPressed() {
    if (webview.canGoBack()) {
        webview.goBack();
        return;
    }
    super.onBackPressed();
}
}

按下后退按钮后，我应该对 AsyncTask 执行 url 做什么？现在它按原样返回页面，未解析。

Answer 1

您需要操纵 WebBackForwardList加载您的 URL，而不是默认由 WebView 自动缓存的 URL。

您可以通过重写WebView.goBack()来做到这一点:

  @Override
  public void goBack() {
    WebBackForwardList temp = copyBackForwardList();
    for (int i=0; i<temp.getSize(); i++) {
      WebHistoryItem item = temp.getItemAtIndex(i);
      // do whatever you want here...
    }

    // do whatever you want here...
    super.goBack();
  }