implementing Android WebView

Hi In this tutorial i will give you instructions on implementing webview in Android. Sometimes you may need to load webpages inside your application itself rather than redirecting the user to browser. In this tutorial we will see the commands necessary to display webpages inside the application. First of all create a new project and compile it, Make sure you build.gradle file look similar to this

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apply plugin: 'com.android.application'
 
android {
    compileSdkVersion 24
    buildToolsVersion "24.0.1"
 
    defaultConfig {
        applicationId "lankahomes.baman.webviewProject"
        minSdkVersion 15
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
 
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:24.2.0'
    compile 'com.android.support:design:24.2.0'
}

This application will need internet to download webpages, therefore add the internet permission to your manifest. Your manifest file must look similar to this.

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="lankahomes.baman.webviewProject">
 
    <uses-permission android:name="android.permission.INTERNET" />
 
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".mainWebView"
            android:label="@string/title_activity_main_web_view"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>

Now Create a relative layout activity  and then add a web view inside the relative layout, your activity should look similar to this.

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<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context="lankahomes.baman.webviewProject.MainActivity">
 
    <WebView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:id="@+id/id_main_view" />
</RelativeLayout>

Then modify your mainActivity .java file, it should look similar to this. Look for the comments inside the code for explanation.

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import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
 
    WebView webview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 
        setContentView(R.layout.activity_main);
        webview = (WebView)findViewById(R.id.id_main_view);
        webView();
 
    }
 
    //Metodo llamar el webview
    private void webView(){
        //Habilitar JavaScript (Videos youtube)
        webview.getSettings().setJavaScriptEnabled(true);
 
        //Handling Page Navigation
        webview.setWebViewClient(new MyWebViewClient());
 
        //Load a URL on WebView
        webview.loadUrl("http://www.sathyabaman.com/");
    }
 
    // Metodo Navigating web page history
    @Override public void onBackPressed() {
        if(webview.canGoBack()) {
            webview.goBack();
        } else {
            super.onBackPressed();
        }
    }
 
    // Subclase WebViewClient() para Handling Page Navigation
    private class MyWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (Uri.parse(url).getHost().equals("http://www.sathyabaman.com/")) { //Force to open the url in WEBVIEW
                return false;
            }
            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            startActivity(intent);
            return true;
        }
    }
 
}

Now compile your project and run. You should be able to see a webpage loaded inside your webview. As shown Below.

I am a Software Engineer.

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