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android WebView ProgressBar

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activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <WebView
        android:id="@+id/webView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone"/>
    <ProgressBar
        android:id="@+id/progress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:layout_centerInParent="true"
        android:indeterminateTint="@color/orange"/>
</RelativeLayout>

Для своей картинки вместо стандартного ProgressBar:

    <ProgressBar
        android:id="@+id/progress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:layout_centerInParent="true"
        android:indeterminateDrawable="@drawable/progress"/>

progress.xml

<animated-rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/progress_icon"
    android:pivotX="50%"
    android:pivotY="50%"/>

MainActivity.java

public class MainActivity extends AppCompatActivity {
    private WebView webView;
    private ProgressBar spinner;
    String ShowOrHideWebViewInitialUse = "show";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        webView = findViewById(R.id.webView);
        spinner = findViewById(R.id.progress);
        webView.setWebViewClient(new CustomWebViewClient());
    }
    private class CustomWebViewClient extends WebViewClient{
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon){
            spinner.setVisibility(View.VISIBLE);
            if(ShowOrHideWebViewInitialUse.equals("show")){
                view.setVisibility(View.INVISIBLE);
            }
        }
        @Override
        public void onPageFinished(WebView view, String url){
            ShowOrHideWebViewInitialUse = "hide";
            spinner.setVisibility(View.GONE);
            view.setVisibility(View.VISIBLE);
            super.onPageFinished(view, url);
        }
     }
}
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