我在以下代码中处理第一页加载的进度条。在我点击其他链接后，没有显示progrss栏？
如果有人可以告诉我如何更改此代码以使进度条适用于所有加载？
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();
}
}
答案 0 :(得分：2)
使用以下工作代码::
public class Android_Activity extends Activity {
private Android_Activity _activity;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_PROGRESS);
_activity = this;
setContentView(R.layout.main);
mwebview=(WebView)view.findViewById(R.id.webview);
mwebview.getSettings().setJavaScriptEnabled(true);
mwebview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
if(checkInternetConnection(_activity)==true){
if(savedInstanceState==null)
mwebview.loadUrl(URL);
else
mwebview.restoreState(savedInstanceState);
}
else{
AlertDialog.Builder builder = new AlertDialog.Builder(_activity);
builder.setMessage("Please check your network connection.")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
AlertDialog alert = builder.create();
alert.show();
}
mwebview.setWebChromeClient(new WebChromeClient() {
@Override
public void onProgressChanged(WebView view, int progress) {
if(mwebview.getVisibility()==View.VISIBLE)
{
_activity.setProgress(progress * 100);
}
}
});
mwebview.setWebViewClient(new HelloWebViewClient());
}
//HelloWebViewClient class for webview
private class HelloWebViewClient extends WebViewClient {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
}
@Override
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
// TODO Auto-generated method stub
super.onReceivedError(view, errorCode, description, failingUrl);
}
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// Otherwise, the link is not for a page on my site, so launch another Activity that handles URLs
view.loadUrl(url);
return true;
}
} //HelloWebViewClient-class
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// Check if the key event was the Back button and if there's history
if ((keyCode == KeyEvent.KEYCODE_BACK) && mwebview.canGoBack() ){
mwebview.goBack();
return true;
}
// If it wasn't the Back key or there's no web page history, bubble up to the default
// system behavior (probably exit the activity)
return super.onKeyDown(keyCode, event);
}
//To check whether network connection is available on device or not
public static boolean checkInternetConnection(Activity _activity) {
ConnectivityManager conMgr = (ConnectivityManager) _activity.getSystemService(Context.CONNECTIVITY_SERVICE);
if (conMgr.getActiveNetworkInfo() != null
&& conMgr.getActiveNetworkInfo().isAvailable()
&& conMgr.getActiveNetworkInfo().isConnected())
return true;
else
return false;
}//checkInternetConnection()
}
答案 1 :(得分：0)
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.KDG_EPG_Iphone"
android:versionCode="1"
android:versionName="1.00.00" android:installLocation="auto">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<supports-screens
android:resizeable="false"
android:smallScreens = "false"
android:normalScreens = "true"
android:largeScreens = "false"
android:anyDensity = "true"/>
<uses-sdk android:minSdkVersion="8"/>
<application android:label="@string/app_name" android:icon="@drawable/icon">
<activity android:screenOrientation="portrait"
android:theme="@android:style/Theme.Black.NoTitleBar"
android:configChanges="keyboardHidden|orientation"
android:label="@string/app_label" android:name="com.KDG_EPG_Iphone.KDG_EPG_Iphone_Activity" android:icon="@drawable/icon">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>