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How to Convert any Website into Professional Android App

Techno Teach

1. WebView Android App Code:

<WebView android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/webView" android:layout_alignParentTop="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" tools:ignore="MissingConstraints" />

MainActivity.java

import android.os.Bundle; import android.webkit.WebView; import android.webkit.WebViewClient; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { String websiteURL = "https://viskill.in/"; // sets web url private WebView webview; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Webview stuff webview = findViewById(R.id.webView); webview.getSettings().setJavaScriptEnabled(true); webview.getSettings().setDomStorageEnabled(true); webview.setOverScrollMode(WebView.OVER_SCROLL_NEVER); webview.loadUrl(websiteURL); webview.setWebViewClient(new WebViewClientDemo()); } private class WebViewClientDemo extends WebViewClient { @Override //Keep webview in app when clicking links public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); return true; } } }


AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />


2. Internet Connection Error:

AndroidManifest.xml

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

MainActivity.java

import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.Bundle; import android.util.Log; import android.webkit.WebView; import android.webkit.WebViewClient; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { String websiteURL = "https://viskill.in/"; // sets web url private WebView webview; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if( ! CheckNetwork.isInternetAvailable(this)) //returns true if internet available { //if there is no internet do this setContentView(R.layout.activity_main); //Toast.makeText(this,"No Internet Connection, Chris",Toast.LENGTH_LONG).show(); new AlertDialog.Builder(this) //alert the person knowing they are about to close .setTitle("No internet connection available") .setMessage("Please Check you're Mobile data or Wifi network.") .setPositiveButton("Ok", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }) //.setNegativeButton("No", null) .show(); } else { //Webview stuff webview = findViewById(R.id.webView); webview.getSettings().setJavaScriptEnabled(true); webview.getSettings().setDomStorageEnabled(true); webview.setOverScrollMode(WebView.OVER_SCROLL_NEVER); webview.loadUrl(websiteURL); webview.setWebViewClient(new WebViewClientDemo());

} } private class WebViewClientDemo extends WebViewClient { @Override //Keep webview in app when clicking links public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); return true; } } } class CheckNetwork { private static final String TAG = CheckNetwork.class.getSimpleName(); public static boolean isInternetAvailable(Context context) { NetworkInfo info = (NetworkInfo) ((ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo(); if (info == null) { Log.d(TAG,"no internet connection"); return false; } else { if(info.isConnected()) { Log.d(TAG," internet connection available..."); return true; } else { Log.d(TAG," internet connection"); return true; } } } }


3. Back & Exit Feature:

MainActivity.java

//set back button functionality
@Override
public void onBackPressed() { //if user presses the back button do this
    if (webview.isFocused() && webview.canGoBack()) { //check if in webview and the user can go back
        webview.goBack(); //go back in webview
    } else { //do this if the webview cannot go back any further

        new AlertDialog.Builder(this) //alert the person knowing they are about to close
                .setTitle("EXIT")
                .setMessage("Are you sure. You want to close this app?")
                .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        finish();
                    }
                })
                .setNegativeButton("No", null)
                .show();
    }
}


4. Swipe Down to Refresh:

activity_main.xml

<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
    android:id="@+id/swipeContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <WebView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/webView"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        tools:ignore="MissingConstraints" />

</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

MainActivity.java

SwipeRefreshLayout mySwipeRefreshLayout;

//Swipe to refresh functionality
mySwipeRefreshLayout = (SwipeRefreshLayout)this.findViewById(R.id.swipeContainer);

mySwipeRefreshLayout.setOnRefreshListener(
        new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                webview.reload();
            }
        }
);
private class WebViewClientDemo extends WebViewClient {
    @Override
    //Keep webview in app when clicking links
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
    @Override
    public void onPageFinished(WebView view, String url) {
        super.onPageFinished(view, url);
        mySwipeRefreshLayout.setRefreshing(false);
    }
}

5. Screen Rotation:

AndroidManifest.xml

android:screenOrientation="portrait">


6. Splash Screen:

SplashActivity.java

  import androidx.appcompat.app.AppCompatActivity;


    import android.content.Intent;

    import android.os.Bundle;

    import android.view.Window;

    import android.view.WindowManager;


    public class SplashActivity extends AppCompatActivity {


        @Override

        protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);


            Window window = getWindow() ;


            window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

            setContentView(R.layout.activity_splash);




            Thread splashTread = new Thread(){


                @Override

                public void run() {

                    try {

                        sleep(3000);

                        startActivity(new Intent(getApplicationContext(),MainActivity.class));

                        finish();

                    } catch (InterruptedException e) {

                        e.printStackTrace();

                    }


                    super.run();

                }

            };


            splashTread.start();





        }


    }


activity_splash

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

    <LinearLayout 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"

        android:orientation="vertical"

        tools:context=".SplashActivity">


        <ImageView

            android:layout_width="match_parent"

            android:layout_height="300dp"

            android:src="@drawable/logo"

            android:scaleType="centerCrop"

            android:padding="50dp"

            android:layout_marginTop="220dp"/>

        <ProgressBar

            android:layout_width="220dp"

            android:layout_height="10dp"

            android:layout_gravity="center_horizontal"

            style="?android:attr/progressBarStyleHorizontal"

            android:max="100"

            android:indeterminate="true"

            android:progress="0"

            android:layout_marginTop="100dp"


            />



    </LinearLayout>

AndroidManifest.xml

 <activity
            android:name=".MainActivity"
            android:exported="false" />
        <activity
            android:name=".SplashActivity"
            android:exported="true"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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


7. Enable Download Button:

MainActivity.Java

if(Build.VERSION.SDK_INT>= Build.VERSION_CODES.M){
            if(checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED){

                Log.d("permission","permission denied to WRITE_EXTERNAL_STORAGE - requesting it");
                String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
                requestPermissions(permissions,1);
            }


        }

//handle downloading

webview.setDownloadListener(new DownloadListener() {
            @Override
            public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimeType, long contentLength) {

                DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
                request.setMimeType(mimeType);
                String cookies = CookieManager.getInstance().getCookie(url);
                request.addRequestHeader("cookie",cookies);
                request.addRequestHeader("User-Agent",userAgent);
                request.setDescription("Downloading file....");
                request.setTitle(URLUtil.guessFileName(url,contentDisposition,mimeType));
                request.allowScanningByMediaScanner();
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,URLUtil.guessFileName(url, contentDisposition, mimeType));
                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                dm.enqueue(request);
                Toast.makeText(getApplicationContext(),"Downloading File",Toast.LENGTH_SHORT).show();


            }
        });

AndroidMainfest.xml

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>












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