Android webview上面的进度条不停

Question

进度条不会停止，会无限期加载。

Referred Page:

片段代码

public class testFragment extends Fragment {

    private WebView mWebView;
    private WebSettings mWebSettings;
    private ProgressBar progressBar;

    public testFragment() {
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @SuppressLint("SetJavaScriptEnabled")
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.testfragment, container, false);

        mWebView = (WebView) v.findViewById(R.id.webView);
        progressBar = (ProgressBar) v.findViewById(R.id.pro);
//progressBar.setVisibility(View.GONE);

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

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                progressBar.setVisibility(View.GONE);
            }

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }
        });

        mWebView.setWebViewClient(new WebViewClient());
        mWebSettings = mWebView.getSettings();
        mWebSettings.setJavaScriptEnabled(true);
        mWebSettings.setSupportMultipleWindows(false);
        mWebSettings.setJavaScriptCanOpenWindowsAutomatically(false);
        mWebSettings.setLoadWithOverviewMode(true);
        mWebSettings.setUseWideViewPort(true);
        mWebSettings.setSupportZoom(false);
        mWebSettings.setBuiltInZoomControls(true);
        mWebSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
        mWebSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
        mWebSettings.setDomStorageEnabled(true);
        mWebView.loadUrl("https://whosebug.com/");

        return v;
    }
}

去掉注释中的注释，进度条就会完全消失

我也想在引用的页面上使用@Override public void onProgressChanged (WebView view, int newProgress)，但它没有出现在可用的方法中。

Answer 1

问题是，您已设置 2 web clients 并且最后一条语句覆盖了第一条语句。所以 visible & hide 从未被执行过。

由于在 UI 中，您已将进度条的可见性设置为可见。因此它始终可见。

删除 mWebView.setWebViewClient(new WebViewClient()); 行。

对于onProgressChanged()

你必须使用 WebChromeClient。由于在 Chrome 客户端中可用，在 WebViewClient

中不可用

mWebView.setWebChromeClient(new WebChromeClient() {
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                super.onProgressChanged(view, newProgress);
            }
        });

Android webview上面的进度条不停

The progress bar above the Android webview does not stop

android

webview

progress-bar