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Android WebView加载对话框未被取消

progressdialog webview android java

Señor Reginold Francis · 技术社区 · 16 年前

我使用以下代码

class CustomWebViewClient extends WebViewClient {
    Context context;
    ProgressDialog pd = null;


    public CustomWebViewClient (Context c){
        context = c;
    }

    public void onPageFinished(WebView view, String url){
        pd.dismiss();
    }



    public boolean shouldOverrideUrlLoading(final WebView view, final String url) {
        pd = ProgressDialog.show(context, "", "pageload. Please wait...", true);


        view.loadUrl(url);  

        return true;
    } 

}

当我单击WebView中的链接时,对话框出现,页面开始加载,但是当页面加载完成时,对话框仍在屏幕上。显然,代码足够简单,但我无法理解。另外,我想我应该补充一下,被点击的链接有一些重定向,但我不确定这是否与这里的原因有关。

我该怎么做?

4 回复 | 直到 10 年前

statosdotcom 10 年前

Steven&Sander,尝试在处理程序中取消进度对话框

像这样:

  class pdHandler extends Handler {
    @Override
    public void handleMessage(Message msg) {
      if(pd != null)
      {
      pd.dismiss();
      pd = null;
      }
    }

然后在onpageFinished中调用处理程序:

 public void onPageFinshed(WebView view, String url){
        pdHandler.sendEmptyMessage(0);
    }

&你完了!

Sergey Glotov Nitesh Khosla 15 年前

你错过了 @Override 注释。

这是正确的代码:

class CustomWebViewClient extends WebViewClient {
    Context context;
    ProgressDialog pd = null;

    public CustomWebViewClient(Context c){
        context = c;
    }

    @Override
    public void onPageFinished(WebView view, String url){
        if (pd != null && pd.isShowing())
        {
            pd.dismiss();
        }
    }

    @Override
    public boolean shouldOverrideUrlLoading(final WebView view, final String url) {
        pd = ProgressDialog.show(context, "", "pageload. Please wait...", true);
        view.loadUrl(url);  
        return true;
    } 
}

此代码有效,但初始加载时不显示进度对话框。如果需要,请将此代码添加到类的构造函数:

pd = ProgressDialog.show(context, "", "pageload. Please wait...", true);

Shaun 14 年前

这行得通, 你拼写错误,你写了“onpagefinshed”

iAndroid 14 年前

public class WebDialog extends Dialog
{

    static final int                      BLUE                  = 0xFF6D84B4;
    static final float[]                  DIMENSIONS_DIFF_LANDSCAPE =
                                                                    { 20, 60 };
    static final float[]                  DIMENSIONS_DIFF_PORTRAIT  =
                                                                    { 40, 60 };
    static final FrameLayout.LayoutParams   FILL                    = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);
    static final int                      MARGIN                    = 4;
    static final int                      PADDING                   = 2;
    static final String                   DISPLAY_STRING            = "touch";

    private String                        mUrl;
//  private DialogListener                mListener;
    private ProgressDialog                mSpinner;
    private WebView                       mWebView;
    private LinearLayout                  mContent;
    private TextView                      mTitle;

    public WebDialog(Context context, String url)
    {
        super(context);
        mUrl = url;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        mSpinner = new ProgressDialog(getContext());
        mSpinner.requestWindowFeature(Window.FEATURE_NO_TITLE);
        mSpinner.setMessage("Loading...");

        mContent = new LinearLayout(getContext());
        mContent.setOrientation(LinearLayout.VERTICAL);
        setUpTitle();
        setUpWebView();
        Display display = getWindow().getWindowManager().getDefaultDisplay();
        final float scale = getContext().getResources().getDisplayMetrics().density;
        int orientation = getContext().getResources().getConfiguration().orientation;
        float[] dimensions = (orientation == Configuration.ORIENTATION_LANDSCAPE) ? DIMENSIONS_DIFF_LANDSCAPE : DIMENSIONS_DIFF_PORTRAIT;
        addContentView(mContent, new LinearLayout.LayoutParams(display.getWidth() - ((int) (dimensions[0] * scale + 0.5f)), display.getHeight() - ((int) (dimensions[1] * scale + 0.5f))));
    }

    private void setUpTitle()
    {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        Drawable icon = getContext().getResources().getDrawable(R.drawable.ic_launcher);
        mTitle = new TextView(getContext());
        mTitle.setText("Website");
        mTitle.setTextColor(Color.WHITE);
        mTitle.setTypeface(Typeface.DEFAULT_BOLD);
        mTitle.setBackgroundColor(BLUE);
        mTitle.setPadding(MARGIN + PADDING, MARGIN, MARGIN, MARGIN);
//      mTitle.setCompoundDrawablePadding(MARGIN + PADDING);
//      mTitle.setCompoundDrawablesWithIntrinsicBounds(icon, null, null, null);
        mContent.addView(mTitle);
    }

    private void setUpWebView()
    {
        mWebView = new WebView(getContext());
        mWebView.setVerticalScrollBarEnabled(false);
        mWebView.setHorizontalScrollBarEnabled(false);
        mWebView.setWebViewClient(new WebDialog.DialogWebViewClient());
        mWebView.getSettings().setJavaScriptEnabled(true);

        System.out.println(" mURL = "+mUrl);

        mWebView.loadUrl(mUrl);
        mWebView.setLayoutParams(FILL);
        mContent.addView(mWebView);
    }

    private class DialogWebViewClient extends WebViewClient
    {

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

            return true;
        }

        @Override
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl)
        {
            super.onReceivedError(view, errorCode, description, failingUrl);
            WebDialog.this.dismiss();
        }

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon)
        {
            super.onPageStarted(view, url, favicon);
            mSpinner.show();
        }

        @Override
        public void onPageFinished(WebView view, String url)
        {
            super.onPageFinished(view, url);
            String title = mWebView.getTitle();
            if (title != null && title.length() > 0)
            {
                mTitle.setText(title);
            }
            mSpinner.dismiss();
        }

    }
}