How can I solve WebViewClient breaking application?

I am trying to add a WebViewClient to my WebView application. But every time I try to start it with WebViewClient, it stops working.

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private WebView myWebView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        MyWebViewClient webViewClient = new MyWebViewClient(this);
        myWebView.setWebViewClient(webViewClient);

        myWebView = findViewById(R.id.webview);
        myWebView.loadUrl("https://www.google.com.br/");

        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);

    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && myWebView.canGoBack()) {
            myWebView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }
}

MyWebViewClient.java

public class MyWebViewClient extends WebViewClient {

    private Activity activity = null;
    public MyWebViewClient(Activity activity) {
        this.activity = activity;
    }
    @Override
    public boolean shouldOverrideUrlLoading(WebView webView, String url) {
        if(url.contains("https://google.com/")) return false;
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
        activity.startActivity(intent);
        return true;
    }

}

When I comment the line myWebView.setWebViewClient(webViewClient); in the MainActivity.java the application works again. Any ideas on how to solve this WebVIewClient problem?

Here you go, you are setting the client on myWebView before its initialization.

    public class MainActivity extends AppCompatActivity {

    private WebView myWebView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //should be initialized first
        myWebView = findViewById(R.id.webview);

        MyWebViewClient webViewClient = new MyWebViewClient(this);
        myWebView.setWebViewClient(webViewClient);


        myWebView.loadUrl("https://www.google.com.br/");

        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);

    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && myWebView.canGoBack()) {
            myWebView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }
}