Question

我正在使用webview在我的应用中显示网页。网页加载大约需要2-3秒。在网页加载之前，我想显示一个活动圈子进度条，如显示here的那个。
这就是活动圈子的样子：

我怎样才能完成它？

我在网上搜索过但无法找到令人满意的正确解释。谢谢！

WebViewPage.java

public class Webpage extends Activity {

WebView web;
ProgressBar progressBar;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.web_page);

    Intent startwebpage = getIntent();

    web = (WebView) findViewById(R.id.webView);
    web.setWebViewClient(new myWebClient());

    web.getSettings().setJavaScriptEnabled(true);
    web.loadUrl("http://www.google.com");
}

public class myWebClient extends WebViewClient
{
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        // TODO Auto-generated method stub
        super.onPageStarted(view, url, favicon);
    }

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        // TODO Auto-generated method stub

        view.loadUrl(url);
        return true;

    }

    @Override
    public void onPageFinished(WebView view, String url) {
        // TODO Auto-generated method stub
        super.onPageFinished(view, url);
    }
}
}

Answer 1

在progressBar方法中显示onPageStarted并在onPageFinished中将其关闭。

    private ProgressDialog progressBar;

在onPageStarted中显示progressBar：

@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
    // TODO Auto-generated method stub
    super.onPageStarted(view, url, favicon);

     // prepare for a progress bar dialog
        progressBar = new ProgressDialog(v.getContext());
        progressBar.setCancelable(true);
        progress.setProgressStyle(ProgressDialog.STYLE_SPINNER);            
        progressBar.show();
}

2.在onPageFinished中删除它：

    @Override
    public void onPageFinished(WebView view, String url) {
        // TODO Auto-generated method stub
        super.onPageFinished(view, url);

        progressBar.dismiss();
    }

编辑：使用ProgressBar代替ProgressDialog。

在布局中使用以下代码。使用您选择的drawable“@ drawable / progress”

 <ProgressBar
    android:id="@+id/progress_bar"
    style="?android:attr/progressBarStyleLarge"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:visibility="gone"
    android:indeterminateDrawable="@drawable/progress" >
</ProgressBar>

在您的活动中充气。使其在onPageStarted中可见并进入onPageFinished。

private ProgressBar prgrsBar;

@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
    // TODO Auto-generated method stub
    super.onPageStarted(view, url, favicon);

    prgrsBar.setVisibility(View.VISIBLE);
}

 @Override
public void onPageFinished(WebView view, String url) {
    // TODO Auto-generated method stub
    super.onPageFinished(view, url);

    prgrsBar.setVisibility(View.GONE);
}

Answer 2

这对我有用： ProgressDialog pb = null;

        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            // TODO Auto-generated method stub
            super.onPageStarted(view, url, favicon);

            // prepare for a progress bar dialog
            if (pb == null) {
                pb = new ProgressDialog(Quiz.this);
                pb.setCancelable(true);
                pb.setProgressStyle(ProgressDialog.STYLE_SPINNER);
                pb.show();
            }
        }

        public void onPageFinished(WebView view, String url) {
            // TODO Auto-generated method stub
            super.onPageFinished(view, url);

            pb.dismiss();
        }

在加载webview之前显示活动圈 - Android

2 个答案: