Hi guys Here I am going to explain how to call a java function from webview
Step 1)MainActivity .java
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class MainActivity extends Activity {
WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Activity MyActivity = this;
webView= (WebView) findViewById(R.id.webView);
getWindow().setFeatureInt(Window.FEATURE_PROGRESS,
Window.PROGRESS_VISIBILITY_ON);
webView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
MyActivity .setTitle("Loading...");
MyActivity .setProgress(progress * 100);
if (progress == 100)
MyActivity .setTitle("Android Dhina");
}
});
webView.setWebViewClient(new WebViewClient());
webView.addJavascriptInterface(new WebAppInterface(this), "Android");
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("file:///android_asset/web.html");
}
public class WebAppInterface {
Context context;
WebAppInterface(Context c) {
context= c;
}
public void showToast(String toast) {
Toast.makeText(context, toast, Toast.LENGTH_SHORT).show();
}
}
}
Step 2)activity_main.xml
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">
<WebView
android:id="@+id/webview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
Step 3)assets/web.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width; user-scalable=0;" />
<title>Android Dhina</title>
<h1>Android Dhina Webview</h1>
</head>
<body>
<input type="button" value="Call Function"
onClick="showAndroidToast('Hello Dhina!')" />
<script language="javascript">
function showAndroidToast(toast) {
Android.showToast(toast);
}
</script>
</body>
</html>
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class MainActivity extends Activity {
WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Activity MyActivity = this;
webView= (WebView) findViewById(R.id.webView);
getWindow().setFeatureInt(Window.FEATURE_PROGRESS,
Window.PROGRESS_VISIBILITY_ON);
webView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
MyActivity .setTitle("Loading...");
MyActivity .setProgress(progress * 100);
if (progress == 100)
MyActivity .setTitle("Android Dhina");
}
});
webView.setWebViewClient(new WebViewClient());
webView.addJavascriptInterface(new WebAppInterface(this), "Android");
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("file:///android_asset/web.html");
}
public class WebAppInterface {
Context context;
WebAppInterface(Context c) {
context= c;
}
public void showToast(String toast) {
Toast.makeText(context, toast, Toast.LENGTH_SHORT).show();
}
}
}
Step 2)activity_main.xml
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">
<WebView
android:id="@+id/webview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
Step 3)assets/web.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width; user-scalable=0;" />
<title>Android Dhina</title>
<h1>Android Dhina Webview</h1>
</head>
<body>
<input type="button" value="Call Function"
onClick="showAndroidToast('Hello Dhina!')" />
<script language="javascript">
function showAndroidToast(toast) {
Android.showToast(toast);
}
</script>
</body>
</html>
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