ProgressBar while Loading WebView in Android

This tutorial demonstrate the usage of ProgressBar while Loading WebView contents in android. This example explains horizontal ProgressBar and ProgressBar dialog with WebView.

Progressbar is a visual indicator of progress in some operation. Displays a bar to the user representing how far the operation has progressed; the application can change the amount of progress (modifying the length of the bar) as it moves forward. There is also a secondary progress displayable on a progress bar which is useful for displaying intermediate progress, such as the buffer level during a streaming playback progress bar.

A progress bar can also be made indeterminate. In indeterminate mode, the progress bar shows a cyclic animation without an indication of progress. This mode is used by applications when the length of the task is unknown. The indeterminate progress bar can be either a spinning wheel or a horizontal bar

1. Determinate Progress Bar Example

Here is my layout

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".WebViewActivity" >

    <LinearLayout
        android:id="@+id/urlContainer"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <EditText
            android:id="@+id/urlField"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:hint="Enter URL to open" />

        <Button
            android:id="@+id/goButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Open" />
    </LinearLayout>

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/urlContainer" />

    <WebView
        android:id="@+id/webView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_below="@id/progressBar" />

</RelativeLayout>

Do the following changes in your java code

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;

public class WebViewActivity extends Activity {
	private WebView webView;
	private EditText urlEditText;
	private ProgressBar progress;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_web_view);

		urlEditText = (EditText) findViewById(R.id.urlField);
		webView = (WebView) findViewById(R.id.webView);
		webView.setWebChromeClient(new MyWebViewClient());

		progress = (ProgressBar) findViewById(R.id.progressBar);
		progress.setMax(100);

		Button openUrl = (Button) findViewById(R.id.goButton);
		openUrl.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View view) {
				String url = urlEditText.getText().toString();
				if (validateUrl(url)) {
					webView.getSettings().setJavaScriptEnabled(true);
					webView.loadUrl(url);

					WebViewActivity.this.progress.setProgress(0);
				}
			}

			private boolean validateUrl(String url) {
				return true;
			}
		});

	}

	private class MyWebViewClient extends WebChromeClient {	
		@Override
		public void onProgressChanged(WebView view, int newProgress) {			
			WebViewActivity.this.setValue(newProgress);
			super.onProgressChanged(view, newProgress);
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.web_view, menu);
		return true;
	}

	public void setValue(int progress) {
		this.progress.setProgress(progress);		
	}
}

Output of the above program is

2. Indeterminate Progress Bar Example

In the above layout xml file, do the following changes

<ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_height="wrap_content"
        android:layout_below="@id/urlContainer" />

Below is my activity java class

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;

public class WebViewActivity extends Activity {
	private WebView webView;
	private EditText urlEditText;
	private ProgressBar progress;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_web_view);

		urlEditText = (EditText) findViewById(R.id.urlField);
		webView = (WebView) findViewById(R.id.webView);
		webView.setWebViewClient(new MyWebViewClient());

		progress = (ProgressBar) findViewById(R.id.progressBar);
		progress.setVisibility(View.GONE);
		Button openUrl = (Button) findViewById(R.id.goButton);
		openUrl.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View view) {
				String url = urlEditText.getText().toString();
				if (validateUrl(url)) {
					webView.getSettings().setJavaScriptEnabled(true);
					webView.loadUrl(url);

				}
			}

			private boolean validateUrl(String url) {
				return true;
			}
		});

	}

	private class MyWebViewClient extends WebViewClient {	
		 @Override
		    public boolean shouldOverrideUrlLoading(WebView view, String url) {
		        view.loadUrl(url);
		        return true;
		    }

		 @Override
		public void onPageFinished(WebView view, String url) {
			 progress.setVisibility(View.GONE);
				WebViewActivity.this.progress.setProgress(100);
			super.onPageFinished(view, url);
		}

		 @Override
		public void onPageStarted(WebView view, String url, Bitmap favicon) {
			 progress.setVisibility(View.VISIBLE);
			WebViewActivity.this.progress.setProgress(0);
			super.onPageStarted(view, url, favicon);
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.web_view, menu);
		return true;
	}

	public void setValue(int progress) {
		this.progress.setProgress(progress);		
	}
}

Below is the Output of the above code