Browser Android App

13, July 2020

I have completed the basic coding of my browser app for android which is based on Kotlin language. I am writing the detail code here

#Activity_Main

<<<<<<

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

       <android.support.v7.widget.Toolbar
               android:layout_width="match_parent"
               android:layout_height="?attr/actionBarSize"
               android:id="@+id/toolbar"
               android:elevation="4dp"
               android:background="@color/colorPrimary"
               app:contentInsetStart="0dp"
               app:contentInsetLeft="0dp"
               android:contentInsetLeft="0dp"
               android:contentInsetStart="0dp"

       >
           <LinearLayout
               android:layout_width="match_parent"
               android:layout_height="wrap_content"
               android:id="@+id/search_layout"
               android:orientation="horizontal"
               android:layout_margin="10dp"
               android:background="@android:color/white"
               android:gravity="center"
           >
               <ImageView
                   android:layout_width="40dp"
                   android:layout_height="40dp"
                   android:gravity="center"
                   android:background="@android:color/white"
                   android:padding="10dp"
                   android:src="@drawable/google"
                   android:id="@+id/toolbar_search_imageview_favicon"
               />

               <EditText
                   android:layout_width="0dp"
                   android:layout_height="wrap_content"
                   android:layout_weight="4"
                   android:maxLines="1"
                   android:inputType="textNoSuggestions"
                   android:gravity="top|left"
                   android:id="@+id/edit_text"
                   android:background="@android:color/white"
                   android:hint="Search or Enter URL"
                   android:textSize="13sp"
                   android:padding="10dp"
                   android:textColor="@android:color/black"
                   android:textColorHint="@android:color/black"
               />

               <Button
                   android:layout_width="0dp"
                   android:layout_height="wrap_content"
                   android:layout_weight="1"
                   android:gravity="center"
                   android:background="@android:color/white"
                   android:textSize="15sp"
                   android:onClick="go"
                   android:textColor="@android:color/black"
                   android:text="go"
               />

           </LinearLayout>


      </android.support.v7.widget.Toolbar>

    <ProgressBar
        android:layout_width="match_parent"
        android:layout_height="3dp"
        style="?android:attr/progressBarStyleHorizontal"
        android:id="@+id/progressbar"
        android:background="@color/colorPrimary"
        android:visibility="gone"
        android:progressDrawable="@drawable/custom_progress"
    />
    <WebView
        android:id="@+id/webview"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="7"
    />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_gravity="center"
        android:layout_weight="0.43"
        android:background="@color/bottom_bar_background"
        android:orientation="horizontal"

        >

        <ImageButton
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?android:selectableItemBackground"
            android:onClick="goBack"
            android:src="@drawable/ic_baseline_arrow_back_24" />

        <ImageButton
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?android:selectableItemBackground"
            android:onClick="goForward"
            android:src="@drawable/ic_baseline_arrow_forward_24" />

        <ImageButton
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?android:selectableItemBackground"
            android:onClick="goHome"
            android:src="@drawable/ic_baseline_home_24" />

        <ImageButton
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?android:selectableItemBackground"
            android:onClick="refresh"
            android:src="@drawable/ic_baseline_refresh_24" />

        <ImageButton
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?android:selectableItemBackground"
            android:onClick="share"
            android:src="@drawable/ic_baseline_share_24" />

    </LinearLayout>



</LinearLayout>

>>>>>>

#MainActivity.kt

<<<<<<

package com.example.browser

import android.app.Activity
import android.content.pm.PackageManager
import android.os.Build
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.v7.app.AppCompatViewInflater
import android.util.Patterns
import android.view.View
import android.view.inputmethod.InputMethodManager
import kotlinx.android.synthetic.main.activity_main.*
import android.Manifest
import android.annotation.SuppressLint
import android.app.AlertDialog
import android.app.DownloadManager
import android.content.Context
import android.content.DialogInterface
import android.content.Intent
import android.graphics.Bitmap
import android.net.Uri
import android.os.Environment
import android.support.v4.app.ActivityCompat
import android.view.KeyEvent
import android.webkit.*


@Suppress("DEPRECATION")
class MainActivity : AppCompatActivity()
{
var share_url:String? = null
    @SuppressLint("SetJavaScriptEnabled")

    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        webview.loadUrl("https://www.google.com/")

        setSupportActionBar(toolbar)

        webview.settings.javaScriptEnabled = true

        webview.webChromeClient = object  : WebChromeClient()
        {
            override fun onProgressChanged(view: WebView?, newProgress: Int)
            {
                progressbar.progress = newProgress
                super.onProgressChanged(view, newProgress)

                if (newProgress == 100)
                {
                    progressbar.visibility = View.GONE
                }
            }
        }

        webview.webViewClient = object: WebViewClient()
        {
            override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?)
            {
                progressbar.visibility = View.VISIBLE

                share_url = url

                if ("https://www.google.com/" != url)
                {
                    edit_text.setText(url)
                }
                else
                {
                    edit_text.text.clear()
                }
                super.onPageStarted(view, url, favicon)
            }
        }

        webview.setDownloadListener { url, userAgent, contentDisposition, mimetype, contentLength ->

                if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.M)
                {
                     if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)
                     {
                          downloadDialog(url, userAgent, contentDisposition, mimetype)
                     }
                     else
                     {
                          ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE), 1)
                     }

                }
            else
                {
                     //code for devices below API 29
                     downloadDialog(url, userAgent, contentDisposition, mimetype)
                }

        }


    }

    private fun downloadDialog(url: String?, userAgent: String?, contentDisposition: String?, mimetype: String?)
    {
        //file name from url
        val filename = URLUtil.guessFileName(url,contentDisposition,mimetype)
        //alert Dialog
        val builder = AlertDialog.Builder(this@MainActivity)
        //title for dialog
        builder.setTitle("Download")
        builder.setMessage("Do you want to save $filename")

        builder.setPositiveButton("Yes") { dialogInterface, i ->
            val request = DownloadManager.Request(Uri.parse(url))
            //cookies
            val cookie = CookieManager.getInstance().getCookie(url)

            request.addRequestHeader("Cookie",cookie)
            request.addRequestHeader("User-Agent",userAgent)

            request.allowScanningByMediaScanner()

            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)

            val downloadManager = getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager

            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,filename)

            downloadManager.enqueue(request)

        }
        builder.setNegativeButton("Cancel") {dialogInterface, i ->

            dialogInterface.cancel()
        }
        val dialog:AlertDialog = builder.create()
        dialog.show()
    }

    override fun onPause()
    {
        super.onPause()
        webview.onPause()
        webview.pauseTimers()
    }

    override fun onResume()
    {
        super.onResume()
        webview.onResume()
        webview.resumeTimers()
    }
        fun goBack(view: View)
        {
            if (webview.canGoBack())
                webview.goBack()
        }

        fun goForward(view: View)
        {
            if (webview.canGoForward())
                webview.goForward()
        }

    fun goHome(view: View)
    {
        webview.loadUrl("https://www.google.com/")
    }

    fun refresh(view: View)
    {
        webview.reload()
    }

    fun go(view: View)
    {
        var text = edit_text.text.toString()

        searchorLoad(text)
    }

    override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean
    {
        if (keyCode == KeyEvent.KEYCODE_BACK && webview.canGoBack())
        {
            webview.goBack()
            return true
        }
        return super.onKeyDown(keyCode, event)
    }

    fun share(view: View)
    {
        val shareIntent = Intent()
        shareIntent.action = Intent.ACTION_SEND
        shareIntent.type = "text/plain"

        shareIntent.putExtra(Intent.EXTRA_TEXT,share_url)
        shareIntent.putExtra(Intent.EXTRA_SUBJECT, "URL")

        startActivity(Intent.createChooser(shareIntent,"Share with your friends"))


    }

    private fun searchorLoad(text: String)
    {
        if (Patterns.WEB_URL.matcher(text.toLowerCase()).matches())
        {
            if (text.contains("http://")||text.contains("https://"))
            {
                webview.loadUrl(text)
            }
            else
            {
                webview.loadUrl("https://$text")
            }
        }
        else
        {
            webview.loadUrl("https://www.google.com/search?q=$text")
        }

        hideKeyboard()

    }

    private fun hideKeyboard()
    {
        val inputMethodManager = getSystemService (Activity.INPUT_METHOD_SERVICE) as InputMethodManager

        inputMethodManager.hideSoftInputFromWindow (currentFocus?.windowToken,InputMethodManager.SHOW_FORCED)

    }
}

>>>>>>

#AndroidManifest.xml

<<<<<<

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.browser">

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

    <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"
        android:windowSoftInputMode="stateAlwaysHidden|adjustNothing"
        >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

>>>>>>

#Colors.xml

<<<<<<

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#707cff</color>
    <color name="colorPrimaryDark">#3250cb</color>
    <color name="colorAccent">#ffa7b7</color>
    <color name="bottom_bar_background">#e0e0e0</color>
</resources>

>>>>>>

#Styles.xml

<<<<<<

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>

>>>>>>

#Custom_Progress

<<<<<<

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <corners android:radius="1dp"/>
                <solid android:color="#ffffff"/>
            </shape>
        </clip>
    </item>
</layer-list>

>>>>>>

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TechRahul

Browser Android App

13, July 2020

I have completed the basic coding of my browser app for android which is based on Kotlin language. I am writing the detail code here

#Activity_Main

#MainActivity.kt

#AndroidManifest.xml

#Colors.xml

#Styles.xml

#Custom_Progress

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