Gudivada Somaraju Hemanth: Android WebView Using HTML

Android WebView Using HTML

Step 1 : Select File -> New -> Project -> Android Application Project (or) Android Project. Fill the forms and click "Finish" button. If you have any doubt regarding create a new project Click Here.

Step 2 : Open res -> layout -> activity_main.xml (or) main.xml and add following code :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello_world"
    />
<EditText
    android:id="@+id/msg"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
<Button
android:id="@+id/sendmsg"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Msg to JavaScript"
    />
<WebView
    android:id="@+id/mybrowser"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
   />
</LinearLayout>

Step 3 : Open src -> package -> MainActivity.java and add following code :

package com.gudivada.hemanthsomaraju;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

    WebView myBrowser;
    EditText Msg;
    Button btnSendMsg;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myBrowser = (WebView)findViewById(R.id.mybrowser);

        final MyJavaScriptInterface myJavaScriptInterface
            = new MyJavaScriptInterface(this);
        myBrowser.addJavascriptInterface(myJavaScriptInterface, "AndroidFunction");

        myBrowser.getSettings().setJavaScriptEnabled(true);
        myBrowser.loadUrl("file:///android_asset/Hemanth.html");

        Msg = (EditText)findViewById(R.id.msg);
        btnSendMsg = (Button)findViewById(R.id.sendmsg);
        btnSendMsg.setOnClickListener(new Button.OnClickListener(){

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                String msgToSend = Msg.getText().toString();
                myBrowser.loadUrl("javascript:callFromActivity(\""+msgToSend+"\")");

            }});

    }

    public class MyJavaScriptInterface {
        Context mContext;

        MyJavaScriptInterface(Context c) {
            mContext = c;
        }

        public void showToast(String toast){
            Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
        }

        public void openAndroidDialog(){
            AlertDialog.Builder myDialog
            = new AlertDialog.Builder(MainActivity.this);
            myDialog.setTitle("DANGER!");
            myDialog.setMessage("Trust No One!");
            myDialog.setPositiveButton("OK", null);
            myDialog.show();
        }

    }
}

Step 4 : Open Hemanth.html and add following code :

Hemanth<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width; user-scalable=0;" />
<title>Hemanth Somaraju</title>
</head>
<body>
<h1>Hemanth Somaraju</h1>
<p id="mytext">Hello!</p>
<input type="button" value="Say hello" onClick="showAndroidToast('Hello Hemanth Somaraju!')" />
<input type="button" value="Open Dialog" onClick="openAndroidDialog()" />
<script language="javascript">
    function showAndroidToast(toast) {
        AndroidFunction.showToast(toast);
    }

    function openAndroidDialog() {
        AndroidFunction.openAndroidDialog();
    }

    function callFromActivity(msg){
    document.getElementById("mytext").innerHTML = msg;
    }
</script>

</body>
</html>

Step 5 : Open AndroidManifest.xml and add following code :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.gudivada.hemanthsomaraju"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="4"
         />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.gudivada.hemanthsomaraju.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Step 6 : Our output will be like this :