Webview

Web view is used in android development to convert a website into application.It is used when we have no control of database therefore  functionality  is controlled by website. the code to make a web view application is below.

Manifest file

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"  

  package="com.vishal.mimitmalout">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <application      

  android:allowBackup="true"        

  android:icon="@mipmap/ic_launcher"      

  android:label="@string/app_name"      

  android:roundIcon="@mipmap/ic_launcher_round"  

  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>
    </application>

</manifest>

MainActivity.java

package com.vishal.mimitmalout;

import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.PorterDuff;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.AlertDialogLayout;
import android.view.View;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {
WebView web;
ProgressBar progressBar;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getSupportActionBar().hide();
        web=findViewById(R.id.web);
        progressBar=findViewById(R.id.progress);
        web.getSettings().setJavaScriptEnabled(true);
        web.loadUrl("https://mimitmalout.ac.in/");
        web.setWebViewClient(new WebViewClient());
        web.setWebViewClient(new Myclient());



    }

    @Override    public void onBackPressed() {
        if (web.canGoBack()){
            web.goBack();
        }
        else{
            AlertDialog.Builder ab=new AlertDialog.Builder(this);
            ab.setTitle("Exit");
            ab.setMessage("Do you want to close  application");
            ab.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                @Override                public void onClick(DialogInterface dialog, int which) {
                   MainActivity.super.onBackPressed();
                }
            });
            ab.setNegativeButton("No", new DialogInterface.OnClickListener() {
                @Override                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            });
            ab.setCancelable(false);
            ab.create();
            ab.show();
        }


    }

    private class Myclient extends WebViewClient {

        @Override        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
        }

        @Override        public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
            progressBar.setVisibility(View.VISIBLE);
            return super.shouldOverrideUrlLoading(view, request);
        }

        @Override        public void onPageFinished(WebView view, String url) {
            progressBar.setVisibility(View.GONE);
            super.onPageFinished(view, url);
        }
    }
}

activity_main.xml


<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"    
xmlns:app="http://schemas.android.com/apk/res-auto"   
xmlns:tools="http://schemas.android.com/tools"    
android:layout_width="match_parent"    
android:layout_height="match_parent"    
tools:context=".MainActivity">

 <WebView       
 android:layout_width="match_parent"      
 android:layout_height="match_parent"      
 android:id="@+id/web">
</WebView>

<ProgressBar   
 android:layout_width="wrap_content"   
 android:layout_height="wrap_content"
 android:id="@+id/progress"   
 app:layout_constraintTop_toTopOf="parent"  
 app:layout_constraintLeft_toLeftOf="parent"  
 app:layout_constraintRight_toRightOf="parent"    
 app:layout_constraintBottom_toBottomOf="parent"/>
</android.support.constraint.ConstraintLayout>