Permissions handling in React Native - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the PermissionsAndroid module from React Native.

React Native

import { [1] } from 'react-native';

Drag options to blanks, or click blank then click option'

APermissionsAndroid

BPermissionsIOS

CPermissionManager

DPermissions

Attempts:

3 left

💡 Hint

Common Mistakes

Using PermissionsIOS which does not exist

Using a generic Permissions module which is not provided

Misspelling the module name

The PermissionsAndroid module is used to handle Android permissions in React Native.

2fill in blank

medium

Complete the code to request camera permission using PermissionsAndroid.

React Native

const granted = await PermissionsAndroid.[1](PermissionsAndroid.PERMISSIONS.CAMERA);

Drag options to blanks, or click blank then click option'

Aask

Bcheck

Crequest

Dget

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'check' instead of 'request' which does not prompt the user

Using non-existent methods like 'ask' or 'get'

The request method asks the user to grant the specified permission.

3fill in blank

hard

Fix the error in the code to check if camera permission is granted.

React Native

const hasPermission = await PermissionsAndroid.[1](PermissionsAndroid.PERMISSIONS.CAMERA);
if (hasPermission === PermissionsAndroid.RESULTS.GRANTED) {
  console.log('Camera permission granted');
}

Drag options to blanks, or click blank then click option'

Acheck

Brequest

Cverify

Dask

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'request' which prompts the user unnecessarily

Using non-existent methods like 'verify' or 'ask'

The check method returns the current permission status without prompting the user.

4fill in blank

hard

Fill both blanks to handle permission request result correctly.

React Native

if (granted === PermissionsAndroid.RESULTS.[1]) {
  console.log('Permission [2]');
} else {
  console.log('Permission denied');
}

Drag options to blanks, or click blank then click option'

AGRANTED

BDENIED

Callowed

Ddenied

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'DENIED' constant for granted check

Logging 'denied' message when permission is granted

When permission is granted, the result is GRANTED and we log 'Permission allowed'.

5fill in blank

hard

Fill all three blanks to request multiple permissions and check results.

React Native

const permissions = [PermissionsAndroid.PERMISSIONS.CAMERA, PermissionsAndroid.PERMISSIONS.[1]];
const results = await PermissionsAndroid.[2](permissions);
if (results[PermissionsAndroid.PERMISSIONS.CAMERA] === PermissionsAndroid.RESULTS.[3]) {
  console.log('Camera permission granted');
}

Drag options to blanks, or click blank then click option'

AACCESS_FINE_LOCATION

BrequestMultiple

CGRANTED

DREAD_CONTACTS

Attempts:

3 left

💡 Hint

Common Mistakes

Using single permission request method for multiple permissions

Checking wrong permission result key

Using wrong constants for permissions or results

We request multiple permissions including CAMERA and ACCESS_FINE_LOCATION using requestMultiple. Then we check if CAMERA permission is GRANTED.

Practice

1. What is the main purpose of requesting permissions in a React Native app?

easy

A. To get user approval before accessing sensitive device features

B. To speed up the app loading time

C. To change the app's theme colors

D. To increase the app's storage space

Solution

1. Step 1: Understand app permissions

   Permissions are needed to access sensitive features like camera or location.

2. Step 2: Recognize user control

   Requesting permissions asks users for approval to protect their privacy.

3. Final Answer:

   To get user approval before accessing sensitive device features -> Option A

4. Quick Check:

   Permissions = user approval [OK]

Hint: Permissions protect user privacy by asking approval [OK]

Common Mistakes:

• Thinking permissions speed up app loading
• Confusing permissions with UI settings
• Assuming permissions increase storage

2. Which of the following is the correct way to import the PermissionsAndroid module in React Native?

easy

A. import PermissionsAndroid from 'react-native-permissions';

B. import Permissions from 'PermissionsAndroid';

C. import { PermissionsAndroid } from 'react-native';

D. import { Permissions } from 'react-native';

Solution

1. Step 1: Identify correct import source

   PermissionsAndroid is part of the core 'react-native' package.

2. Step 2: Check import syntax

   Correct syntax uses curly braces for named imports: import { PermissionsAndroid } from 'react-native';

3. Final Answer:

   import { PermissionsAndroid } from 'react-native'; -> Option C

4. Quick Check:

   Correct import = import { PermissionsAndroid } from 'react-native'; [OK]

Hint: Use curly braces for named imports from 'react-native' [OK]

Common Mistakes:

• Importing from wrong package
• Missing curly braces for named imports
• Using incorrect module names

3. What will the following React Native code output if the user denies the camera permission?

async function requestCamera() {
  const granted = await PermissionsAndroid.request(
    PermissionsAndroid.PERMISSIONS.CAMERA
  );
  if (granted === PermissionsAndroid.RESULTS.GRANTED) {
    console.log('Camera permission granted');
  } else {
    console.log('Camera permission denied');
  }
}
requestCamera();

medium

A. Camera permission denied

B. Camera permission granted

C. Syntax error

D. No output

Solution

1. Step 1: Understand permission request result

   If user denies, the result is not 'GRANTED'.

2. Step 2: Check conditional output

   Code logs 'Camera permission denied' when permission is denied.

3. Final Answer:

   Camera permission denied -> Option A

4. Quick Check:

   Denied permission logs denial message [OK]

Hint: Denied permission triggers else block console log [OK]

Common Mistakes:

• Assuming permission is always granted
• Confusing async function behavior
• Ignoring else condition

4. Identify the error in this React Native permission request code:

async function requestLocation() {
  const granted = await PermissionsAndroid.request(
    PermissionsAndroid.PERMISSIONS.LOCATION
  );
  if (granted === PermissionsAndroid.RESULTS.GRANTED) {
    console.log('Location permission granted');
  }
}

medium

A. Async function cannot use await

B. Missing else block to handle denied permission

C. Console.log syntax is wrong

D. PermissionsAndroid.PERMISSIONS.LOCATION is incorrect permission name

Solution

1. Step 1: Check permission constant name

   There is no 'LOCATION' permission; correct names are 'ACCESS_FINE_LOCATION' or 'ACCESS_COARSE_LOCATION'.

2. Step 2: Understand impact of wrong permission name

   Using wrong permission name causes runtime error or unexpected behavior.

3. Final Answer:

   PermissionsAndroid.PERMISSIONS.LOCATION is incorrect permission name -> Option D

4. Quick Check:

   Permission name must be exact [OK]

Hint: Use exact permission constants from docs [OK]

Common Mistakes:

• Using generic or incorrect permission strings
• Forgetting to handle denied permissions
• Misusing async/await syntax

5. You want to request both camera and microphone permissions in a React Native app before starting a video call. Which approach correctly handles both permissions and proceeds only if both are granted?

hard

A. Request microphone permission twice to ensure access

B. Request camera and microphone permissions separately and check each result before proceeding

C. Request permissions without awaiting results and start video call immediately

D. Request only camera permission and assume microphone is granted

Solution

1. Step 1: Understand multiple permission requests

   Each permission must be requested and checked individually to ensure access.

2. Step 2: Combine results before proceeding

   Proceed only if both camera and microphone permissions are granted to avoid errors.

3. Final Answer:

   Request camera and microphone permissions separately and check each result before proceeding -> Option B

4. Quick Check:

   Check all permissions granted before action [OK]

Hint: Check each permission result before proceeding [OK]

Common Mistakes:

• Assuming one permission covers both features
• Not awaiting permission results
• Requesting same permission multiple times