MainActivity.java
import android.content.Context;
import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
JSCode js;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView web = findViewById(R.id.web);
String file = "file:///android_asset/test.html";
web.getSettings().setJavaScriptEnabled(true);
js = new JSCode(this);
web.addJavascriptInterface(js, "call");
web.loadUrl(file);
}
public class JSCode {
Context mContext;
public JSCode(Context c) {
mContext = c;
}
@android.webkit.JavascriptInterface
public void show(String toast) {
AlertDialog.Builder a = new AlertDialog.Builder(mContext);
a.setTitle("Alert Message");
a.setMessage("Good Morning");
a.setCancelable(false);
a.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
a.show();
}
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"/>
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<WebView
android:id="@+id/web"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<LinearLayout>
test.html
<html>
<head>
<script type="text/javascript"
function get(){
call.show("Hello");
}
</script>
</head>
<body>
<form>
<div align="center" <input onclick="get()" type="button" value="Click me" /></div>
</form>
</body>
</html>
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