├── .idea ├── .gitignore ├── vcs.xml ├── modules.xml └── Most-Asked-Android-Interview-Question-2022.iml ├── README.md └── LICENSE /.idea/.gitignore: -------------------------------------------------------------------------------- 1 | # Default ignored files 2 | /shelf/ 3 | /workspace.xml 4 | -------------------------------------------------------------------------------- /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /.idea/Most-Asked-Android-Interview-Question-2022.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ![interview question by rahnuma sharib ](https://user-images.githubusercontent.com/31402470/205415809-309b7109-a9c1-4be8-a9ff-59b71f496776.png) 2 | 3 | # Most Asked Android Interview Questions In 2022 4 | 5 | > Most Asked Android Interview Questions In 2022 - Your Guide For Android Interview Preparation 6 | 7 | ## Prepared and maintained by [Rahnuma Sharib](https://www.linkedin.com/in/rahnumasharib/) who is having experience of taking interviews of many Android developers. 8 | 9 | > Hi, I am Rahnuma Sharib, I have mentored many developers, and their efforts landed them high-paying tech jobs. I am passionate about sharing knowledge through open-source, blogs, and videos. 10 | 11 | ## Android 12 | 13 | * **When I am in my activity get a phone call what will be the lifecycle of the activity** 14 | 15 | * **When I am in my activity get a phone call what will be the lifecycle of the fragment inside my activity** 16 | 17 | * **Fragment, activity and application life cycle and when there life cycle method get trigger.** 18 | 19 | * **Difference between fragment or activity** 20 | 21 | * **What is fragment.** 22 | 23 | * **What happen when we press back button on activity A.** 24 | 25 | * **Which activity life cycle method trigger when orientation change.** 26 | 27 | * **When onDistroy will get called before onPause or onStop.** 28 | 29 | * **Type of services in Android** 30 | 31 | * **What do you think about NavHost in navigation** 32 | 33 | * **What are SOLID principles?** 34 | 35 | * **What is broadcast receiver and content provider and how can we implement it.** 36 | 37 | * **Advantage of using recycle view over list and grid view.** 38 | 39 | * **Launch mode and there type and differences.** 40 | 41 | * **Data binding and its type.** 42 | 43 | * **How to pass data from activity to fragment or fragment to fragment.** 44 | 45 | * **Difference between adding or replacing a fragment.** 46 | 47 | * **What is Intent and its type** 48 | 49 | * **Constraint layout and its advantage** 50 | 51 | * **Difference between push value and set value ( Live Data )** 52 | 53 | * **Advantage of using live data** 54 | 55 | * **What is Dex file.** 56 | 57 | * **Which database you use and why** 58 | 59 | * **Benefit of using Room database** 60 | 61 | * **Difference between room and sqlite.** 62 | 63 | * **Difference between service and thread.** 64 | 65 | * **What's is concurrency.** 66 | 67 | * **How to improve app performance.** 68 | 69 | * **What is memory leak and how to avoid it.** 70 | 71 | * **How to go back on previous fragment when click on back button.** 72 | 73 | * **How to communicate between service and activity.** 74 | 75 | * **What is concurrency.** 76 | 77 | * **On which thread service run and how can we change the thread.** 78 | 79 | * **Job intent service and its purpose** 80 | 81 | * **How to improve application performance.** 82 | 83 | * **What is memory leak and how to solve it.** 84 | 85 | * **How service will communicate with activity.** 86 | 87 | * **What is job scheduler and its work.** 88 | 89 | * **Parameter constructer and non parameter constructer are good and why in fragment.** 90 | 91 | 92 | ## Kotlin 93 | 94 | * **What are the benefits of Kotlin over Java** 95 | 96 | * **Explain the use of lateinit & lazy keywords** 97 | 98 | * **How to check lateinit class is initialize or not.** 99 | 100 | * **What is null safety in Kotlin?** 101 | 102 | * **What is the diff between Var & Val and const and val** 103 | 104 | * **What is Elvis operator?** 105 | 106 | * **What is Flow API in Kotlin** 107 | 108 | * **Explain coroutines in kotlin** 109 | 110 | * **What are scoped functions and there use in kotlin** 111 | 112 | * **What is singleton class and how can you declare it?** 113 | 114 | * **what is the diff between companion obj & object** 115 | 116 | * **Used extension functions? example** 117 | 118 | * **Data class and how its different from other classes.** 119 | 120 | * **Sealed class.** 121 | 122 | * **What is suspend function.** 123 | 124 | * **what is the diff between static & singleton Explain @jvmstatic @jvmoverloads @jvmfiled** 125 | 126 | * **Difference between volatile and syncronized.** 127 | 128 | * **Live data, Mutable live data and Mediator live data** 129 | 130 | * **Advantage of live data** 131 | 132 | * **What is flow , state flow and shared flow** 133 | 134 | * **Extension, inline, inflix and high order function and there benefit in term of memory.** 135 | 136 | * **Difference between public ( visiblity modifier ) and open keyword** 137 | 138 | * **Difference between volatile and synchronized.** 139 | 140 | * **Arraymap and hashmap.** 141 | 142 | * **How hashmap work in background.** 143 | 144 | * **What is referential equality and structal equality.** 145 | 146 | * **Will reference of two data class with same set of data will it be equal or not?** 147 | 148 | 149 | ## Java 150 | 151 | * **What is the diff between encapsulation & abstraction give practical example** 152 | 153 | * **Explain OOP Concepts.** 154 | 155 | * **Will reference of two data class with same set of data will it be equal or not?** 156 | 157 | * **When to use array & Array List** 158 | 159 | * **What is the volatile keyword** 160 | 161 | * **What is the transient keyword** 162 | 163 | * **What is a diff between a string buffer & string builder** 164 | 165 | * **Why is string immutable** 166 | 167 | * **What is the diff between encapsulation & abstraction (practical example)** 168 | 169 | * **class A -> extends class B, implements interface C. Both have the same method fun add() {}, Which one will be implemented in class A? Try yourself** 170 | 171 | * **What is the difference between String test = new String(“X”) & String test = “X”. Explain String constant pool & String literal** 172 | 173 | 174 | 175 | ## Kotlin Coroutines. 176 | 177 | 178 | * **What is coroutines.** 179 | 180 | * **What is coroutines dispatchers there type and work.** 181 | 182 | * **What is coroutines scope and its type.** 183 | 184 | * **What is coroutines context.** 185 | 186 | * **What is coroutines builder, its type and there work.** 187 | 188 | * **Difference between launch and async.** 189 | 190 | 191 | ## ViewModel. 192 | 193 | * **What is ViewModel and its advantage.** 194 | 195 | * **How to instantiate viewmodel.** 196 | 197 | * **What is the difference between ViewModel and AndroidViewModel.** 198 | 199 | * **How ViewModel work internally.** 200 | 201 | * **How ViewModel retain data during configuration change.** 202 | 203 | * **During configuration change activity distroy and re-create then how view-model instance remain same.** 204 | 205 | * **What is view-model factory & how to pass data in view model constructor** 206 | 207 | * **Difference between shared view model and view model.** 208 | 209 | 210 | 211 | ## Dependency Injection. 212 | 213 | * **What is Dependency Injection and its benefit.** 214 | 215 | * **Where should we write code of DI.** 216 | 217 | * **How hilt provide required object should we write it.** 218 | 219 | 220 | 221 | ## Mvvm 222 | 223 | * **What is MVVM, and how does it work and its advantage.** 224 | 225 | * **what is the diff between MVP/MVC & MVVM** 226 | 227 | 228 | 229 | ## Networking libraries ( Retrofit & Volley ) 230 | 231 | * **Which one you prefer to use and why?** 232 | 233 | * **advantage of using retrofit.** 234 | 235 | 236 | 237 | ## VCS ( Git) 238 | 239 | * **what is Marge and rebase in git.** 240 | 241 | * **how you create branch and work on them .** 242 | 243 | 244 | 245 | ## Jetpack Compose 246 | 247 | * **What are the benefits of using Jetpack compose?** 248 | 249 | * **What is a Composable function?** 250 | 251 | * **What is a declarative approach?** 252 | 253 | * **What jetpack compose libraries have you used?** 254 | 255 | * **Explain compose UI basic components** 256 | 257 | 258 | 259 | ## Testing 260 | 261 | * **In Unit testing, what is @Before & @Beforeclass annotation used for** 262 | 263 | * **Why should we use a Mockito lib?** 264 | 265 | * **Explain Unit & Instrumentation tests** 266 | 267 | 268 | 269 | ## Data Structure 270 | 271 | * **What is Queue, Stack and Array.** 272 | 273 | * **The time complexity of Hash Table — O(1).** 274 | 275 | * **Best for getting the last item — Stack** 276 | 277 | * **Time Complexity of Binary Search — O(log N)** 278 | 279 | * **Which is best Sorting Algo — Quick Sort** 280 | 281 | * **Best performance for finding minimum value — Array** 282 | 283 | 284 | That’s a wrap for now! Many more to come 285 | I hope you find this blog helpful. 286 | 287 | 288 | 289 | ### Found this project useful :heart: 290 | 291 | * Support by clicking the :star: button on the upper right of this page. :v: 292 | 293 | ### License 294 | ``` 295 | Copyright (C) 2022 Rahnuma Sharib 296 | 297 | Licensed under the Apache License, Version 2.0 (the "License"); 298 | you may not use this file except in compliance with the License. 299 | You may obtain a copy of the License at 300 | 301 | http://www.apache.org/licenses/LICENSE-2.0 302 | 303 | Unless required by applicable law or agreed to in writing, software 304 | distributed under the License is distributed on an "AS IS" BASIS, 305 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 306 | See the License for the specific language governing permissions and 307 | limitations under the License. 308 | ``` 309 | 310 | ### Contributing to Android Interview Questions 311 | Just make pull request. You are in! 312 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. Definitions. 8 | 9 | "License" shall mean the terms and conditions for use, reproduction, 10 | and distribution as defined by Sections 1 through 9 of this document. 11 | 12 | "Licensor" shall mean the copyright owner or entity authorized by 13 | the copyright owner that is granting the License. 14 | 15 | "Legal Entity" shall mean the union of the acting entity and all 16 | other entities that control, are controlled by, or are under common 17 | control with that entity. For the purposes of this definition, 18 | "control" means (i) the power, direct or indirect, to cause the 19 | direction or management of such entity, whether by contract or 20 | otherwise, or (ii) ownership of fifty percent (50%) or more of the 21 | outstanding shares, or (iii) beneficial ownership of such entity. 22 | 23 | "You" (or "Your") shall mean an individual or Legal Entity 24 | exercising permissions granted by this License. 25 | 26 | "Source" form shall mean the preferred form for making modifications, 27 | including but not limited to software source code, documentation 28 | source, and configuration files. 29 | 30 | "Object" form shall mean any form resulting from mechanical 31 | transformation or translation of a Source form, including but 32 | not limited to compiled object code, generated documentation, 33 | and conversions to other media types. 34 | 35 | "Work" shall mean the work of authorship, whether in Source or 36 | Object form, made available under the License, as indicated by a 37 | copyright notice that is included in or attached to the work 38 | (an example is provided in the Appendix below). 39 | 40 | "Derivative Works" shall mean any work, whether in Source or Object 41 | form, that is based on (or derived from) the Work and for which the 42 | editorial revisions, annotations, elaborations, or other modifications 43 | represent, as a whole, an original work of authorship. For the purposes 44 | of this License, Derivative Works shall not include works that remain 45 | separable from, or merely link (or bind by name) to the interfaces of, 46 | the Work and Derivative Works thereof. 47 | 48 | "Contribution" shall mean any work of authorship, including 49 | the original version of the Work and any modifications or additions 50 | to that Work or Derivative Works thereof, that is intentionally 51 | submitted to Licensor for inclusion in the Work by the copyright owner 52 | or by an individual or Legal Entity authorized to submit on behalf of 53 | the copyright owner. For the purposes of this definition, "submitted" 54 | means any form of electronic, verbal, or written communication sent 55 | to the Licensor or its representatives, including but not limited to 56 | communication on electronic mailing lists, source code control systems, 57 | and issue tracking systems that are managed by, or on behalf of, the 58 | Licensor for the purpose of discussing and improving the Work, but 59 | excluding communication that is conspicuously marked or otherwise 60 | designated in writing by the copyright owner as "Not a Contribution." 61 | 62 | "Contributor" shall mean Licensor and any individual or Legal Entity 63 | on behalf of whom a Contribution has been received by Licensor and 64 | subsequently incorporated within the Work. 65 | 66 | 2. Grant of Copyright License. Subject to the terms and conditions of 67 | this License, each Contributor hereby grants to You a perpetual, 68 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 69 | copyright license to reproduce, prepare Derivative Works of, 70 | publicly display, publicly perform, sublicense, and distribute the 71 | Work and such Derivative Works in Source or Object form. 72 | 73 | 3. Grant of Patent License. Subject to the terms and conditions of 74 | this License, each Contributor hereby grants to You a perpetual, 75 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 76 | (except as stated in this section) patent license to make, have made, 77 | use, offer to sell, sell, import, and otherwise transfer the Work, 78 | where such license applies only to those patent claims licensable 79 | by such Contributor that are necessarily infringed by their 80 | Contribution(s) alone or by combination of their Contribution(s) 81 | with the Work to which such Contribution(s) was submitted. If You 82 | institute patent litigation against any entity (including a 83 | cross-claim or counterclaim in a lawsuit) alleging that the Work 84 | or a Contribution incorporated within the Work constitutes direct 85 | or contributory patent infringement, then any patent licenses 86 | granted to You under this License for that Work shall terminate 87 | as of the date such litigation is filed. 88 | 89 | 4. Redistribution. You may reproduce and distribute copies of the 90 | Work or Derivative Works thereof in any medium, with or without 91 | modifications, and in Source or Object form, provided that You 92 | meet the following conditions: 93 | 94 | (a) You must give any other recipients of the Work or 95 | Derivative Works a copy of this License; and 96 | 97 | (b) You must cause any modified files to carry prominent notices 98 | stating that You changed the files; and 99 | 100 | (c) You must retain, in the Source form of any Derivative Works 101 | that You distribute, all copyright, patent, trademark, and 102 | attribution notices from the Source form of the Work, 103 | excluding those notices that do not pertain to any part of 104 | the Derivative Works; and 105 | 106 | (d) If the Work includes a "NOTICE" text file as part of its 107 | distribution, then any Derivative Works that You distribute must 108 | include a readable copy of the attribution notices contained 109 | within such NOTICE file, excluding those notices that do not 110 | pertain to any part of the Derivative Works, in at least one 111 | of the following places: within a NOTICE text file distributed 112 | as part of the Derivative Works; within the Source form or 113 | documentation, if provided along with the Derivative Works; or, 114 | within a display generated by the Derivative Works, if and 115 | wherever such third-party notices normally appear. The contents 116 | of the NOTICE file are for informational purposes only and 117 | do not modify the License. You may add Your own attribution 118 | notices within Derivative Works that You distribute, alongside 119 | or as an addendum to the NOTICE text from the Work, provided 120 | that such additional attribution notices cannot be construed 121 | as modifying the License. 122 | 123 | You may add Your own copyright statement to Your modifications and 124 | may provide additional or different license terms and conditions 125 | for use, reproduction, or distribution of Your modifications, or 126 | for any such Derivative Works as a whole, provided Your use, 127 | reproduction, and distribution of the Work otherwise complies with 128 | the conditions stated in this License. 129 | 130 | 5. Submission of Contributions. Unless You explicitly state otherwise, 131 | any Contribution intentionally submitted for inclusion in the Work 132 | by You to the Licensor shall be under the terms and conditions of 133 | this License, without any additional terms or conditions. 134 | Notwithstanding the above, nothing herein shall supersede or modify 135 | the terms of any separate license agreement you may have executed 136 | with Licensor regarding such Contributions. 137 | 138 | 6. Trademarks. This License does not grant permission to use the trade 139 | names, trademarks, service marks, or product names of the Licensor, 140 | except as required for reasonable and customary use in describing the 141 | origin of the Work and reproducing the content of the NOTICE file. 142 | 143 | 7. Disclaimer of Warranty. Unless required by applicable law or 144 | agreed to in writing, Licensor provides the Work (and each 145 | Contributor provides its Contributions) on an "AS IS" BASIS, 146 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 147 | implied, including, without limitation, any warranties or conditions 148 | of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A 149 | PARTICULAR PURPOSE. You are solely responsible for determining the 150 | appropriateness of using or redistributing the Work and assume any 151 | risks associated with Your exercise of permissions under this License. 152 | 153 | 8. Limitation of Liability. In no event and under no legal theory, 154 | whether in tort (including negligence), contract, or otherwise, 155 | unless required by applicable law (such as deliberate and grossly 156 | negligent acts) or agreed to in writing, shall any Contributor be 157 | liable to You for damages, including any direct, indirect, special, 158 | incidental, or consequential damages of any character arising as a 159 | result of this License or out of the use or inability to use the 160 | Work (including but not limited to damages for loss of goodwill, 161 | work stoppage, computer failure or malfunction, or any and all 162 | other commercial damages or losses), even if such Contributor 163 | has been advised of the possibility of such damages. 164 | 165 | 9. Accepting Warranty or Additional Liability. While redistributing 166 | the Work or Derivative Works thereof, You may choose to offer, 167 | and charge a fee for, acceptance of support, warranty, indemnity, 168 | or other liability obligations and/or rights consistent with this 169 | License. However, in accepting such obligations, You may act only 170 | on Your own behalf and on Your sole responsibility, not on behalf 171 | of any other Contributor, and only if You agree to indemnify, 172 | defend, and hold each Contributor harmless for any liability 173 | incurred by, or claims asserted against, such Contributor by reason 174 | of your accepting any such warranty or additional liability. 175 | 176 | END OF TERMS AND CONDITIONS 177 | 178 | APPENDIX: How to apply the Apache License to your work. 179 | 180 | To apply the Apache License to your work, attach the following 181 | boilerplate notice, with the fields enclosed by brackets "[]" 182 | replaced with your own identifying information. (Don't include 183 | the brackets!) The text should be enclosed in the appropriate 184 | comment syntax for the file format. We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | --------------------------------------------------------------------------------