Question

我正在完成我的应用程序，是一个包含一些WebView片段和导航抽屉的简单应用程序，一切正常，但我不知道如何在WebView加载时添加进度条页面，我得到的只是页面加载前的空白屏幕。

这是我的代码......

HomeFragment.java

public class HomeFragment extends Fragment {


private WebView webView;


public HomeFragment() {
    // Required empty public constructor
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
}

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



@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View mainView = (View) inflater.inflate(R.layout.fragment_my_fragment1, container, false);
    WebView webView = (WebView)mainView.findViewById(R.id.webview);
    webView.setWebViewClient(new MantenerDominioWeb());
    webView.getSettings().setJavaScriptEnabled(true);
    webView.getSettings().setBuiltInZoomControls(false);
    webView.getSettings().setSupportZoom(false);
    webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
    webView.getSettings().setAllowFileAccess(true);
    webView.getSettings().setDomStorageEnabled(true);
    webView.canGoBack();
    webView.goBack();
    webView.loadUrl("http://www.lfcchile.com/");
    return mainView;


}



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

@Override
public void onDestroy() {
    super.onDestroy();
}

@Override
public void onDetach() {
    super.onDetach();
}
}

我的WebViewClient类

public class MantenerDominioWeb extends WebViewClient {

private WebView webView;
public ProgressBar progressBarT4;


@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
    if (Uri.parse(url).getHost().endsWith("lfcchile.com") || (Uri.parse(url).getHost().endsWith("thisisanfield.com")) || (Uri.parse(url).getHost().endsWith("liverpoolecho.co.uk")) || (Uri.parse(url).getHost().endsWith("liverpoolfc.com"))) {
        return false;
    }

    Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
    view.getContext().startActivity(intent);
    return true;
}

}

我的Frame XML

<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="com.lfcchile.MyFragment1">

<!-- TODO: Update blank fragment layout -->
<TextView android:layout_width="match_parent" android:layout_height="match_parent"
    android:gravity="center"
    android:text="@string/homefrag" />

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

<ProgressBar
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_gravity="center"
android:id="@+id/progressBar1"/>

</FrameLayout>

有什么想法吗？我试着将progressBar＆＃34;放在前面＆＃34; WebView的，但是当页面加载时，图标不会消失......

Answer 1

我认为不可能放置进度条，因为每个网站都有一定的大小，在最终确定下载页面之前很难对其进行测量。

但您可以在加载页面时放置预加载器（加载），并在结束后删除用户的访问权限。

使用ProgressDialog：

public class HomeFragment extends Fragment {

private ProgressDialog progress;
private WebView webView;


public HomeFragment() {
    // Required empty public constructor
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
}

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



@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View mainView = (View) inflater.inflate(R.layout.fragment_my_fragment1, container, false);
        WebView webView = (WebView)mainView.findViewById(R.id.webview);
        webView.setWebViewClient(new MantenerDominioWeb());
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setBuiltInZoomControls(false);
        webView.getSettings().setSupportZoom(false);
        webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        webView.getSettings().setAllowFileAccess(true);
        webView.getSettings().setDomStorageEnabled(true);
        webView.canGoBack();
        webView.goBack();
        webView.loadUrl("http://www.lfcchile.com/");

        progress = ProgressDialog.show(this, "Aguarde...",
                    "Processando sua solicitação.", true);
        webView.setWebViewClient(new WebViewClient() {

           public void onPageFinished(WebView view, String url) {
                if (progress != null)
                    progress.dismiss();
            }
        });
        return mainView;


    }



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

@Override
public void onDestroy() {
    super.onDestroy();
}

@Override
public void onDetach() {
    super.onDetach();
}
}

Answer 2

将ProgressBar设置为visibility="gone"以启动
在您的WebViewClient子类中，覆盖onPageStarted()以设置ProgressBar到VISIBLE的可见性
在您的WebViewClient子类中，覆盖onPageFinished()以设置ProgressBar到GONE的可见性
创建覆盖WebChromeClient的{{1}}子类，以更新onProgressChanged()
通过调用ProgressBar

WebChromeClient

WebView

将ProgressBar添加到WebView片段

2 个答案: