Posts Tagged WebViewClient

Android WebView and the Indeterminant Progress Solution

Posted by Chris Danielson in Android on May 4th, 2010

I’ve seen a multitude of posts on how to embed the Android WebView object and how to use the built-in feature request PROGRESS, but I’ve yet to come across a demonstration on just how simple it is to integrate a ProgressDialog object. I specifically needed this for one of my projects because I did not want the title bar to render in my application. If the title is not rendered, then the Window Feature Request progress bar and indeterminant functions will not render at all.

So here is how to do it! Trust me it’s absolutely simple!

Code snippet basics:

View Code JAVA
import android.app.ProgressDialog;
//in the class...
private ProgressDialog progressBar;
 
//when you want the dialog to show the first time.
progressBar = ProgressDialog.show(Main.this, "MaxPowerSoft Example", "Loading...");
 
//when you want the progressbar to disappear
if (progressBar.isShowing()) {
   progressBar.dismiss();
}

Here is how it is done in your project.

/res/values/strings.xml

Download strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
   <string name="app_name">MaxPowerSoft Example</string>
   <string name="webview">webview</string> 
</resources>

AndroidManifest.xml

Download AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.maxpowersoft.example"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Main"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-sdk android:minSdkVersion="4"
              android:targetSdkVersion="4" />
</manifest>

/res/layout/main.xml

Download main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <WebView android:id="@string/webview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1" />
</LinearLayout>

Main.java

Download Main.java
package com.maxpowersoft.example;
 
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
 
public class Main extends Activity {
    private WebView webview;
    private static final String TAG = "Main";
    private ProgressDialog progressBar;  
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 
        requestWindowFeature(Window.FEATURE_NO_TITLE);
 
        setContentView(R.layout.main);
 
        this.webview = (WebView)findViewById(R.string.webview);
 
        WebSettings settings = webview.getSettings();
        settings.setJavaScriptEnabled(true);
        webview.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
 
        final AlertDialog alertDialog = new AlertDialog.Builder(this).create();
 
        progressBar = ProgressDialog.show(Main.this, "MaxPowerSoft Example", "Loading...");
 
        webview.setWebViewClient(new WebViewClient() {
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                Log.i(TAG, "Processing webview url click...");
                view.loadUrl(url);
                return true;
            }
 
            public void onPageFinished(WebView view, String url) {
                Log.i(TAG, "Finished loading URL: " +url);
                if (progressBar.isShowing()) {
                    progressBar.dismiss();
                }
            }
 
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                Log.e(TAG, "Error: " + description);
                Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show();
                alertDialog.setTitle("Error");
                alertDialog.setMessage(description);
                alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        return;
                    }
                });
                alertDialog.show();
            }
        });
        webview.loadUrl("http://www.google.com");
    }
}

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