从未使用过 OnProgressChanged

Question

我正在尝试设置一个主要显示 progress bar 和 webview，一旦网站完全加载，progress bar 应该会消失。我正在遵循此代码：

问题是从未使用过 OnProgressChanged 方法：

    public class HUB extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {


        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fragment_hub, container, false);

        final ProgressBar progressBar = (ProgressBar) rootView.findViewById(R.id.pBar);

        WebView mWebView = (WebView) rootView.findViewById(R.id.webview);
        mWebView.setWebViewClient(new WebViewClient(){

            public void onProgressChanged(WebView view, int progress){
                if(progress < 100 && progressBar.getVisibility() == ProgressBar.GONE){
                    progressBar.setVisibility(ProgressBar.VISIBLE);
                }

                progressBar.setProgress(progress);
                if(progress == 100){
                    progressBar.setVisibility(ProgressBar.GONE);
                }
            }
        });
        mWebView.clearCache(true);
        mWebView.clearHistory();
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.getSettings().setDomStorageEnabled(true);
        mWebView.loadUrl("https:10.10.1.40/index.html");
        return rootView;
    }
}

布局：

    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="sykes.moodleapp.HUB">

        <!-- TODO: Update blank fragment layout -->

        <ProgressBar
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/pBar"
            style="?android:attr/progressBarStyleHorizontal"
            android:padding="2dip"/>

        <WebView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/webview"
            ></WebView>

    </FrameLayout>

Answer 1

通过添加以下行将 xml 中的进度条可见性更改为 GONE：

android:visibility="gone"

因为您的代码如果进度小于 100 且可见性为 `View.GONE:

，此条件 if(progress < 100 && progressBar.getVisibility() == ProgressBar.GONE) 只会导致 true

否则

在您获得对进度条的引用之后，在其旁边添加一行，表明 View 是 GONE 这样：

final ProgressBar progressBar = (ProgressBar) rootView.findViewById(R.id.pBar); 
progressBar.setVisibility(View.GONE); //Add this line

Answer 2

供将来参考，WebViewClient doesn't have a onProgressChanged() method, WebChromeClient 可以。

我最终同时使用了它们，因为我希望能够使用 onReceivedSslError() 显示 SSL 错误。

public class HUB extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                     Bundle savedInstanceState) {


    // Inflate the layout for this fragment
    View rootView = inflater.inflate(R.layout.fragment_hub, container, false);

    final ProgressBar progressBar = (ProgressBar) rootView.findViewById(R.id.pBar);

    WebView mWebView = (WebView) rootView.findViewById(R.id.webview);
    mWebView.setWebChromeClient(new WebChromeClient(){
    // SSL error handler
    });

    mWebView.setWebViewClient(new WebViewClient(){

        public void onProgressChanged(WebView view, int progress){
            if(progress < 100 && progressBar.getVisibility() == ProgressBar.GONE){
                progressBar.setVisibility(ProgressBar.VISIBLE);
            }

            progressBar.setProgress(progress);
            if(progress == 100){
                progressBar.setVisibility(ProgressBar.GONE);
            }
        }
    });
    mWebView.clearCache(true);
    mWebView.clearHistory();
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.getSettings().setDomStorageEnabled(true);
    mWebView.loadUrl("https:10.10.1.40/index.html");
    return rootView;
}

从未使用过 OnProgressChanged

OnProgressChanged is never used

java

android

android-webview

android-progressbar

android-fragments