Call Android methods from JavaScript

Question

I searched, but I didn\'t find an answer. I\'m developing an Android app based on webview, using HTML5 and JavaScript. Can I call an Android method, like makeToast()

Answer 1

After creating your Main Activity code you need to create your Javascript code and call WebviewInterface from that, Let's see the example:

public class MainActivity extends AppCompatActivity {

String TAG = "MainActivity";
Context context;
WebView mWebView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    context = this;

    mWebView = (WebView) findViewById(R.id.webview);
    initWebView();

    String ENROLLMENT_URL = "file:///android_asset/about_page.html";
    mWebView.loadUrl(ENROLLMENT_URL);

}

@SuppressLint({ "SetJavaScriptEnabled" })
private void initWebView() {
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.setWebChromeClient(new WebChromeClient());
    mWebView.addJavascriptInterface(new WebviewInterface(), "Interface");
}

public class WebviewInterface {
    @JavascriptInterface
    public void javaMehod(String val) {
        Log.i(TAG, val);
        Toast.makeText(context, val, Toast.LENGTH_SHORT).show();
    }
}
}

activity_main.xml

Look at this link to see full example https://www.legendblogs.com/blog/how-to-call-native-java-methods-from-webview-javascript/121764