以前有人问过这个问题，但是，我是新手，并且在尝试使其正常工作时遇到了问题。我的问题是如何在每次用户单击 webview 中的链接时显示进度对话框。我有一个对话框，显示应用程序首次启动时，但单击链接时不显示对话框。我很确定解决方案就在这里，但我似乎无法将它们正确地组合在一起以使其正常工作.....有人可以帮我把它放在一起。
我的代码
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我的问题没有得到任何帮助，但我终于弄清楚了。我发布了一个示例项目来帮助任何有同样问题的人。这是一个 web_view 项目，每次单击链接时都会显示一个（页面加载...）对话框。此示例还检查 Internet 连接...
这是我的两个java文件。下面的文件包含进度对话框的解决方案。
package com.example.project;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class WebActivity extends Activity {
private WebView wv;
private String LASTURL = "";
Menu myMenu = null;
private ProgressDialog dialog;
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
if (!InternetConnection.checkNetworkConnection(this)) {
showAlert(this, "No Data Connection", "This Application requires an internet connection");
} else {
setContentView(R.layout.web_view);
wv = (WebView) findViewById(R.id.web_view);
WebSettings webSettings = wv.getSettings();
webSettings.setSavePassword(true);
webSettings.setSaveFormData(true);
webSettings.setJavaScriptEnabled(true);
webSettings.setUseWideViewPort(true);
webSettings.setLoadWithOverviewMode(true);
webSettings.setSupportZoom(false);
final Activity activity = this;
// start ProgressDialog with "Page loading..."
dialog = new ProgressDialog(activity);
dialog.setMessage("Page loading...");
dialog.setIndeterminate(true);
dialog.setCancelable(true);
dialog.show();
wv.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
// set address bar and progress
// activity.setTitle( " " + LASTURL );
// activity.setProgress( progress * 100 );
if (progress == 100) {
// stop ProgressDialog after loading
dialog.dismiss();
// activity.setTitle( " " + LASTURL );
}
}
});
wv.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
Toast.makeText(getApplicationContext(),
"Error: " + description + " " + failingUrl,
Toast.LENGTH_LONG).show();
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.indexOf("google") <= 0) {
// the link is not for a page on my site, so launch
// another Activity that handles URLs
Intent intent = new Intent(Intent.ACTION_VIEW, Uri
.parse(url));
startActivity(intent);
return true;
}
return false;
}
/*****************************************************************/
/* Here the load of the page will start so we must launch the */
/* ProgressDialog */
/*****************************************************************/
public void onPageStarted(WebView view, String url,
Bitmap favicon) {
// this is what we should do
dialog.setMessage("Page loading...");
dialog.setIndeterminate(true);
dialog.setCancelable(true);
dialog.show();
//
LASTURL = url;
view.getSettings().setLoadsImagesAutomatically(true);
view.getSettings().setBuiltInZoomControls(true);
}
/*****************************************************************/
/* Here the load of the page will stop so we must dismiss the */
/* ProgressDialog */
/*****************************************************************/
public void onPageFinished(WebView view, String url) {
// this is what we should do
dialog.dismiss();
}
});
wv.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
wv.setScrollbarFadingEnabled(false);
wv.loadUrl("http://www.google.com");
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && wv.canGoBack()) {
wv.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
/*****************************************************************/
/* Here is a menu with basic options. Will probably get
* comments on how this is replaced by action bar */
/*****************************************************************/
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
this.myMenu = menu;
MenuItem item = menu.add(0, 1, 0, "Home");
item.setIcon(R.drawable.home);
MenuItem item2 = menu.add(0, 2, 0, "Back");
item2.setIcon(R.drawable.arrowleft);
MenuItem item3 = menu.add(0, 3, 0, "Reload");
item3.setIcon(R.drawable.s);
MenuItem item4 = menu.add(0, 4, 0, "Share");
item4.setIcon(R.drawable.share);
MenuItem item5 = menu.add(0, 5, 0, "Rate");
item5.setIcon(R.drawable.vote);
MenuItem item6 = menu.add(0, 6, 0, "Exit");
item6.setIcon(R.drawable.close);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case 1:
wv.loadUrl("http://www.google.com");
break;
case 2:
if (wv.canGoBack()) {
wv.goBack();
}
break;
case 3:
wv.loadUrl(LASTURL);
break;
case 4:
Intent sharingIntent = new Intent(Intent.ACTION_SEND);
sharingIntent.setType("plain/text");
sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Check out this app I found.");
startActivity(Intent.createChooser(sharingIntent,"Share using"));
break;
case 5:
Intent marketIntent2 = new Intent(Intent.ACTION_VIEW, Uri.parse(
"http://market.android.com/details?id=" + getPackageName()));
startActivity(marketIntent2);
break;
case 6:
finish();
break;
}
return true;
}
/**
* Display a simple alert dialog with the given text and title.
*
* @param context
* Android context in which the dialog should be displayed
* @param title
* Alert dialog title
* @param text
* Alert dialog message
*/
public void showAlert(Context context, String title, String text) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
// set title
alertDialogBuilder.setTitle( title);
// set dialog message
alertDialogBuilder
.setMessage( text )
.setCancelable(false)
.setPositiveButton("OK",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
// if this button is clicked, close
// current activity
finish();
}
})
.create().show();
}
}
此 java 文件检查 Internet 连接。如果没有可用的连接，应用程序将关闭。
package com.example.project;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
public class InternetConnection {
public static boolean checkNetworkConnection(Context context) {
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
boolean infoResult = false;
boolean wifiResult = false;
boolean mobileResult = false;
try {
NetworkInfo info = connectivityManager.getActiveNetworkInfo();
if (info == null) {
return false;
} else {
infoResult = info.isConnectedOrConnecting();
}
NetworkInfo wifi = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if (wifi == null) {
return false;
} else {
wifiResult = wifi.isConnectedOrConnecting();
}
NetworkInfo mobile = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (mobile == null) {
return false;
} else {
mobileResult = mobile.isConnectedOrConnecting();
}
// if(wifi.isConnectedOrConnecting()||mobile.isConnectedOrConnecting())
} catch (NullPointerException nullPointException) {
System.out.println( nullPointException.getMessage() );
}
return infoResult||wifiResult||mobileResult;
}
}
于 2012-07-15T03:49:14.190 回答