【发布时间】：2012-04-02 09:18:47
【问题描述】：
在下面的代码中，进度条在第一页加载时工作。当我点击其他链接后，进度条没有显示？
如果有人可以告诉我如何更改此代码以使进度条在所有加载时都正常工作？
谢谢，
安德烈。
public class Android_Activity extends Activity {
WebView webview;
@Override
protected void onSaveInstanceState(Bundle outState) {
WebView webview = (WebView) findViewById(R.id.webview);
webview.saveState(outState);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set the main content view
setContentView(R.layout.main);
// check if an instance is stored and so restore it
if (savedInstanceState != null){
((WebView)findViewById(R.id.webview)).restoreState(savedInstanceState);
}
final ProgressDialog progressBar = ProgressDialog.show(this, getString(R.string.progress_title),
getString(R.string.progress_msg));
webview = (WebView)findViewById(R.id.webview);
webview.setHttpAuthUsernamePassword(getString(R.string.kdg_host),
getString(R.string.kdg_realm),
getString(R.string.kdg_user_name),
getString(R.string.kdg_password)
);
//webview.setWebViewClient(new myWebViewClient());
webview.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
webview.getSettings().setRenderPriority(RenderPriority.HIGH);
webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
webview.getSettings().setAllowFileAccess(true);
webview.getSettings().setJavaScriptEnabled(true);
webview.setWebViewClient(new WebViewClient() {
public void onPageStarted(WebView view, String url) {
if (!progressBar.isShowing()) {
progressBar.show();
}
}
public void onPageFinished(WebView view, String url) {
//super.onPageFinished(view, url);
if (progressBar.isShowing()) {
progressBar.dismiss();
}
}
});
webview.loadUrl(getString(R.string.base_url));
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
private class myWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
boolean error = false;
// check if it's an MAILTO URL
if(url.substring(0, 6).equalsIgnoreCase("mailto")){
Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent .setType("plain/text");
emailIntent .putExtra(android.content.Intent.EXTRA_EMAIL, new String[]{url.substring(7)});
startActivity(Intent.createChooser(emailIntent, "Send mail..."));
return true;
}
// check if it's an EXT:// (Call Web Browser)
else if(url.substring(0, 6).equalsIgnoreCase("ext://")){
Uri uriUrl = Uri.parse(url.substring(6));
Intent launchBrowser = new Intent(Intent.ACTION_VIEW, uriUrl);
startActivity(launchBrowser);
return true;
}
// check if it's an RTSP URL
else if(url.substring(0, 4).equalsIgnoreCase("rtsp")){
Uri uri = Uri.parse(url);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
return true;
}
// else if it's an MP4 file link
else if(url.endsWith(".mp4")){
Uri uri = Uri.parse(url);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri, "video/mp4");
startActivity(intent);
return true;
}
// else if it's a 3GP file link
else if(url.endsWith(".3gp")){
Uri uri = Uri.parse(url);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri, "video/3gp");
startActivity(intent);
return true;
}
// else if it's a MP3 file link
else if(url.endsWith(".mp3")){
Uri uri = Uri.parse(url);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri, "audio/mp3");
startActivity(intent);
return true;
}
// else if it's a page URL
else{
URL Url;
try {
Url = new URL(url);
HttpURLConnection httpURLConnection = (HttpURLConnection) Url
.openConnection();
int response = httpURLConnection.getResponseCode();
if ((response >= 200)&&(response < 400))
//view.loadUrl(url);
error = false;
else
error = true;
} catch (Exception e) {
error = true;
}
}
// if an error occurred
if (error) {
showErrorDialog();
}
view.loadUrl(url);
return true;
}
}
@Override
public void onResume() {
super.onResume();
webview.reload();
}
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
showErrorDialog();
}
public void showErrorDialog(){
AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle(getString(R.string.error_title));
alertDialog.setMessage(getString(R.string.error_msg));
alertDialog.setButton(getString(R.string.ok_btn),
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
}
});
alertDialog.show();
}
}
【问题讨论】：
标签： android webkit webview progress-bar