How to Download and Install APK Programmatically in android

Hi developer in this Android tutorial we are sharing How to Download and Install APK Programmatically in android. If you want to make an app and mange app without play store his pass Installing and Update. Hare you can learn an easy way to implementation with full source code.

So Let’s  Start on  Topic How to Download and Install APK Programmatically in android . I am Using in this example kotlin-android.

Build  Gradle  dependencies 

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.core:core-ktx:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation 'com.google.android.material:material:1.0.0'
}

Step 1 :  Create a Android activity with Kotlin Language

Start  Android studio and make a project if you have already create that fine.  hare we make a button on button click download Apk and Install APK direct.

Step 2 : Create a Kotlin Class with name  DownloadController.

class DownloadController(private val context: Context, private val url: String) {

    companion object {
        private const val FILE_NAME = "CodeplayonApp.apk"
        private const val FILE_BASE_PATH = "file://"
        private const val MIME_TYPE = "application/vnd.android.package-archive"
        private const val PROVIDER_PATH = ".provider"
        private const val APP_INSTALL_PATH = "\"application/vnd.android.package-archive\""
    }

    fun enqueueDownload() {

        var destination =
            context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).toString() + "/"
        destination += FILE_NAME

        val uri = Uri.parse("$FILE_BASE_PATH$destination")

        val file = File(destination)
        if (file.exists()) file.delete()

        val downloadManager = context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
        val downloadUri = Uri.parse(url)
        val request = DownloadManager.Request(downloadUri)
        request.setMimeType(MIME_TYPE)
        request.setTitle(context.getString(R.string.title_file_download))
        request.setDescription(context.getString(R.string.downloading))

        // set destination
        request.setDestinationUri(uri)

        showInstallOption(destination, uri)
        // Enqueue a new download and same the referenceId
        downloadManager.enqueue(request)
        Toast.makeText(context, context.getString(R.string.downloading), Toast.LENGTH_LONG)
            .show()


    }

    private fun showInstallOption(
        destination: String,
        uri: Uri
    ) {

        // set BroadcastReceiver to install app when .apk is downloaded
        val onComplete = object : BroadcastReceiver() {
            override fun onReceive(
                context: Context,
                intent: Intent
            ) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                    val contentUri = FileProvider.getUriForFile(
                        context,
                        BuildConfig.APPLICATION_ID + PROVIDER_PATH,
                        File(destination)
                    )
                    val install = Intent(Intent.ACTION_VIEW)
                    install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
                    install.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
                    install.putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE, true)
                    install.data = contentUri
                    context.startActivity(install)
                    context.unregisterReceiver(this)
                    // finish()
                } else {
                    val install = Intent(Intent.ACTION_VIEW)
                    install.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP
                    install.setDataAndType(
                        uri,
                        APP_INSTALL_PATH
                    )
                    context.startActivity(install)
                    context.unregisterReceiver(this)
                    // finish()
                }
            }
        }
        context.registerReceiver(onComplete, IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE))
    }
}

Step 3:  Create a Kotlin file for check SelfPermission

fun AppCompatActivity.checkSelfPermissionCompat(permission: String) =
    ActivityCompat.checkSelfPermission(this, permission)

fun AppCompatActivity.shouldShowRequestPermissionRationaleCompat(permission: String) =
    ActivityCompat.shouldShowRequestPermissionRationale(this, permission)

fun AppCompatActivity.requestPermissionsCompat(
    permissionsArray: Array<String>,
    requestCode: Int
) {
    ActivityCompat.requestPermissions(this, permissionsArray, requestCode)
}


fun View.showSnackbar(msgId: Int, length: Int) {
    showSnackbar(context.getString(msgId), length)
}

fun View.showSnackbar(msg: String, length: Int) {
    showSnackbar(msg, length, null, {})
}

fun View.showSnackbar(
    msgId: Int,
    length: Int,
    actionMessageId: Int,
    action: (View) -> Unit
) {
    showSnackbar(context.getString(msgId), length, context.getString(actionMessageId), action)
}

fun View.showSnackbar(
    msg: String,
    length: Int,
    actionMessage: CharSequence?,
    action: (View) -> Unit
) {
    val snackbar = Snackbar.make(this, msg, length)
    if (actionMessage != null) {
        snackbar.setAction(actionMessage) {
            action(this)
        }.show()
    }
}

Step 4: In you Main activity where you want to download APK file and Install.

add these flow where you want to download apk file and Install APK in you App. With Leaving your app you can download and install APK file add these code where you want these step .

Main Screen XML Code 

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:id="@+id/mainLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.MainActivity">


    <Button
        android:id="@+id/buttonDownload"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimaryDark"
        android:minHeight="40dp"
        android:text="Download"
        android:textAllCaps="false"
        android:textColor="@color/colorWhite"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Main Screen Kotlin Code :

class MainActivity : AppCompatActivity() {

    companion object {
        const val PERMISSION_REQUEST_STORAGE = 0
    }

    lateinit var downloadController: DownloadController

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

        // This apk is taking pagination sample app
        val apkUrl = "https://codeplayon.com/source/apk/app-codeplayonApp.apk"
        downloadController = DownloadController(this, apkUrl)

        buttonDownload.setOnClickListener {
            // check storage permission granted if yes then start downloading file
            checkStoragePermission()
        }
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        if (requestCode == PERMISSION_REQUEST_STORAGE) {
            // Request for camera permission.
            if (grantResults.size == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // start downloading
                downloadController.enqueueDownload()
            } else {
                // Permission request was denied.
                mainLayout.showSnackbar(R.string.storage_permission_denied, Snackbar.LENGTH_SHORT)
            }
        }
    }


    private fun checkStoragePermission() {
        // Check if the storage permission has been granted
        if (checkSelfPermissionCompat(Manifest.permission.WRITE_EXTERNAL_STORAGE) ==
            PackageManager.PERMISSION_GRANTED
        ) {
            // start downloading
            downloadController.enqueueDownload()
        } else {
            // Permission is missing and must be requested.
            requestStoragePermission()
        }
    }

    private fun requestStoragePermission() {

        if (shouldShowRequestPermissionRationaleCompat(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
            mainLayout.showSnackbar(
                R.string.storage_access_required,
                Snackbar.LENGTH_INDEFINITE, R.string.ok
            ) {
                requestPermissionsCompat(
                    arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE),
                    PERMISSION_REQUEST_STORAGE
                )
            }

        } else {
            requestPermissionsCompat(
                arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE),
                PERMISSION_REQUEST_STORAGE
            )
        }
    }
}

Step 5 : Make a FileProvider XML file in res folder  res–>xml–> file_provider_path.xml

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-path
        name="external"
        path="." />
    <external-files-path
        name="external_files"
        path="." />
    <files-path
        name="files"
        path="." />
</paths>

Step 6 :  Add File Provider in Your manifist file .

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="${applicationId}.provider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_provider_paths" />
</provider>

Run you App and Test Happy Coding