How to display progress while loading a url to webview in android?

To display progress when loading a URL in Android WebView, you can achieve this through the following steps:

1. Create a progress bar: You can use the ProgressBar widget.
2. Set up the WebView client: Use WebViewClient and WebChromeClient to listen for loading events.
3. Monitor the loading progress and update the progress bar: Update the progress bar's progress in the onProgressChanged method of WebChromeClient.

Here is a simple example:

First, you need to add a ProgressBar and a WebView in your layout file, for example:

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

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="match_parent"
        android:layout_height="4dp"
        style="@style/Widget.AppCompat.ProgressBar.Horizontal" />

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

Next, in your Activity or Fragment, configure the WebView and ProgressBar:

java
public class MyActivity extends AppCompatActivity {
    private WebView webView;
    private ProgressBar progressBar;

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

        webView = findViewById(R.id.webView);
        progressBar = findViewById(R.id.progressBar);

        // Initialize WebView settings
        initWebView();
        // Load URL
        webView.loadUrl("https://www.example.com");
    }

    private void initWebView() {
        // Enable JavaScript
        webView.getSettings().setJavaScriptEnabled(true);

        // Set up WebView client
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
                // Show progress bar when page starts loading
                progressBar.setVisibility(View.VISIBLE);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                // Hide progress bar when page finishes loading
                progressBar.setVisibility(View.GONE);
            }
        });

        // Set WebChromeClient to track loading progress
        webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                // Update progress bar's progress
                progressBar.setProgress(newProgress);
                if (newProgress == 100) {
                    // Page loading complete
                    progressBar.setVisibility(View.GONE);
                }
            }
        });
    }
}

In this example, when the URL starts loading, the progress bar appears and updates as the page loads. When the page finishes loading, the progress bar automatically hides.

This covers the basic steps and example code for displaying a progress bar when loading a URL in Android WebView. In actual projects, you may need to adjust and optimize this code based on specific requirements.