Question

如何在webview中的链接上每次点击时加载/显示ProgressBar？目前点击后，页面空白将近5到7秒，然后出现ProgessBar ......

Answer 1

可能您可以使用WebViewClient（请参阅onPageStarted(WebView view, String url, Bitmap favicon)）并覆盖其方法

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
                progressBar.setVisibility(View.VISIBLE);
        }

开始展示您的ProgressBar ...

例如：

df['block_encounter_no'] = (df.Class != df.Class.shift()).mask(df.Class.isnull())
                              .groupby(df.Class).cumsum()
print (df)
     a   b Class  block_encounter_no
0   10   0   NaN                 NaN
1   11   1   NaN                 NaN
2   12   2   NaN                 NaN
3   13   3   NaN                 NaN
4   14   4     a                 1.0
5   15   5     a                 1.0
6   16   6     a                 1.0
7   17   7     a                 1.0
8   18   8   NaN                 NaN
9   19   9   NaN                 NaN
10  20  10     a                 2.0
11  21  11     a                 2.0
12  22  12     a                 2.0
13  23  13     a                 2.0
14  24  14     a                 2.0
15  25  15   NaN                 NaN
16  26  16   NaN                 NaN
17  27  17     b                 1.0
18  28  18     b                 1.0
19  29  19     b                 1.0

Answer 2

执行此操作的最佳做法是使用WebViewClient。

实施例

WebView webView;
ProgressBar progressBar;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.webview_layout);

    webView = (WebView) findViewById(R.id.webView_blog);
    progressBar = (ProgressBar) findViewById(R.id.loading);
    lala_icon = (ImageView) findViewById(R.id.lala_icon);

    webView.setOnTouchListener(new View.OnTouchListener() {

        public boolean onTouch(View v, MotionEvent event) {
            return (event.getAction() == MotionEvent.ACTION_MOVE);
        }
    });

    progressBar.setVisibility(View.VISIBLE);
    webView.loadUrl(url);

    webView.setWebViewClient(new WebViewClient() {
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            Log.e("url", url);
            progressBar.setVisibility(View.VISIBLE);
            view.loadUrl(url);
            return true;
        }

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
            Log.e("Loading URL", url);
            progressBar.setVisibility(View.VISIBLE);
        }

        public void onPageFinished(WebView view, String url) {
            try {
                if (progressBar.getVisibility() == View.VISIBLE) {
                    progressBar.setVisibility(View.GONE);
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
        }
    });
}

快乐编码。

每个链接点击进度条加载

2 个答案:

实施例