onPageFinished渲染网页时无法正确触发

Question

由于某种原因,onPageFinished在WebView完成加载之前被触发 - 我无法弄清楚为什么......

public class WebViewClientTest extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    final WebView webview = (WebView) findViewById(R.id.webview);

    webview.setWebViewClient(new WebViewClient() {  
        @Override  
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(webview, url);
            webview.scrollTo(0, 500);
        }  
    });
    webview.loadUrl("http://www.google.co.uk/search?sourceid=chrome&ie=UTF-8&q=lala");

}
}

---

好吧,看起来这不是固定的.我认为加载页面时会出现竞争情况,但无法获得可重现的行为.

我将网页的HTML内容存储在SQLite数据库中,以便在离线时查看.我将内容重新加载到WebView中:

webView.loadDataWithBaseURL("fake://fake.com/", htmlBody, "text/html", "utf-8", null);

似乎有时当WebView加载它时会正确地触发WebViewClient.onPageFinished()方法,有时则不会.有时它似乎在页面加载完成之前触发,产生contentHeight为0并忽略任何scrollTo调用.

有人对此有经验吗？

Answer 1

我有一个项目,只有在webview显示内容后才需要运行代码,就像你一样,onPageFinished()无效.在webview实际呈现页面之前,它的启动速度太快了.

相反,我不得不使用"PictureListener",当webview实际更新屏幕时会被触发.

你这样使用它:

mWebView.setPictureListener(new MyPictureListener());
//... and then later on....
class MyPictureListener implements PictureListener {

    @Override
    public void onNewPicture(WebView view, Picture arg1) {
      // put code here that needs to run when the page has finished loading and
      // a new "picture" is on the webview.      
    }    
}