每次单击链接时，webview中的进度对话框

Question

This question has been asked before but, I'm a newbe and having issues trying to get it to work. My question is how do I get a Progress Dialog to show up everytime a user clicks a link in webview. I have a dialog that shows when the app is first started but, does not show a dialog when the links are clicked. I'm pretty sure that the solution is here , but I just cant seem to put them together properly for it to work..... Can someone please help me put this together.

My Code

See the approved anwser

Answer 1

I didn't get any help with my problem but I finally figured it out. I'm posting an example project to help anyone with the same problem. This is a web_view project that shows a (page Loading...) dialog, every time a link is clicked. This example also checks for an Internet connection...

Download the Eclipse project here

Here are my two java files. The file below contains the solution for the progress dialog.

     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();

    }
}

This java file checks for a Internet Connection. If no connection is available the application will close.

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;
    }
}