Permission Handling | Android Studio | Kotlin

Single & Multiple Runtime Permissions

As we know we need to request Runtime Permissions on Android 6.0 (API level 23 also known as Marshmallow) and above as well as to declare them in the AndroidManifest file.  If we need to use some features like Camera, Location, Contact, etc. we have to handle the runtime permissions. In this Tutorial, we will learn how to Request Single and Multiple Permissions.

Note: I'll add some permissions for example purposes only you may apply the same on permissions you want.

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Video:

Code:

AndroidManifest.xml

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

    <!--For Single Permission Example-->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <!--For Multiple Permission Example-->
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
    <uses-permission android:name="android.permission.CALL_PHONE"/>

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.PermissionHandling"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

            <meta-data
                android:name="android.app.lib_name"
                android:value="" />
        </activity>
    </application>

</manifest>

activity_main.xml

<?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"
    android:padding="20dp"
    android:gravity="center"
    tools:context=".MainActivity">

    <!--TextView: Just for label-->
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Permission handling"
        style="@style/TextAppearance.MaterialComponents.Headline4"/>

    <!--MaterialButton: Click to request single permission-->
    <com.google.android.material.button.MaterialButton
        android:id="@+id/singlePermissionBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Single Permission Request"
        android:layout_marginTop="20dp"/>

    <!--MaterialButton: Click to request multiple permissions-->
    <com.google.android.material.button.MaterialButton
        android:id="@+id/multiplePermissionBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Multiple Permission Request"/>

    <!--TextView: Show result of permission request-->
    <TextView
        android:id="@+id/resultTv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Result"/>

</LinearLayout>

MainActivity.kt

package com.technifysoft.myapplication

import android.Manifest
import android.os.Bundle
import android.util.Log
import android.widget.TextView
import android.widget.Toast
import androidx.activity.result.contract.ActivityResultContracts
import androidx.appcompat.app.AppCompatActivity
import com.google.android.material.button.MaterialButton

class MainActivity : AppCompatActivity() {

    //UI Views
    private lateinit var singlePermissionBtn: MaterialButton
    private lateinit var multiplePermissionBtn: MaterialButton
    private lateinit var resultTv: TextView

    private companion object {
        private const val TAG = "PERMISSION_TAG"
    }

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

        //init the UI Views
        singlePermissionBtn = findViewById(R.id.singlePermissionBtn)
        multiplePermissionBtn = findViewById(R.id.multiplePermissionBtn)
        resultTv = findViewById(R.id.resultTv)

        //handle singlePermissionBtn click, check and request single permission before doing the task that requires it
        singlePermissionBtn.setOnClickListener {
            //permission to be requested
            val permission = Manifest.permission.ACCESS_FINE_LOCATION
            //launcher permission request dialog
            permissionLauncherSingle.launch(permission)
        }

        //handle multiplePermissionBtn click, check and request multiple permissions before doing the task that requires it
        multiplePermissionBtn.setOnClickListener {
            //permissions to be requested
            val permissions = arrayOf(
                Manifest.permission.CAMERA,
                Manifest.permission.RECORD_AUDIO,
                Manifest.permission.CALL_PHONE
            )
            //launcher permissions request dialog
            permissionLauncherMultiple.launch(permissions)
        }
    }


    private val permissionLauncherSingle = registerForActivityResult(
        ActivityResultContracts.RequestPermission()
    ) { isGranted ->
        //here we will check if permission was now (from permission request dialog) or already granted or not. the param isGranted contains value true/false
        Log.d(TAG, "onActivityResult: isGranted: $isGranted")

        if (isGranted) {
            //Permission granted now do the required task here or call the function for that
            singlePermissionGranted()
        } else {
            //Permission was denied so can't do the task that requires that permission
            Log.d(TAG, "onActivityResult: Permission denied...")
            Toast.makeText(this@MainActivity, "Permission denied...", Toast.LENGTH_SHORT).show()
        }
    }

    private val permissionLauncherMultiple = registerForActivityResult(
        ActivityResultContracts.RequestMultiplePermissions()
    ) { result ->
        //here we will check if permissions were now (from permission request dialog) or already granted or not

        var allAreGranted = true
        for (isGranted in result.values) {
            Log.d(TAG, "onActivityResult: isGranted: $isGranted")
            allAreGranted = allAreGranted && isGranted
        }

        if (allAreGranted) {
            //All Permissions granted now do the required task here or call the function for that
            multiplePermissionsGranted()
        } else {
            //All or some Permissions were denied so can't do the task that requires that permission
            Log.d(TAG, "onActivityResult: All or some permissions denied...")
            Toast.makeText(this@MainActivity, "All or some permissions denied...", Toast.LENGTH_SHORT).show()
        }
    }

    private fun singlePermissionGranted() {
        //Do the required task here, i'll just set the text to the TextView i.e. resultTv. You can do whatever you want
        resultTv.text = "Single Permission granted. You can do your tasks..."
    }

    private fun multiplePermissionsGranted() {
        //Do the required task here, i'll just set the text to the TextView i.e. resultTv. You can do whatever you want
        resultTv.text = "All Permissions granted. You can do your tasks..."
    }

}

Result: