1) Which method is called only once in Fragment life cycle?
2) Explain Fragment life cycle? What is the use of Fragments?
3) What is Intent? Difference between Implicit and Explicit Intents?
4) How to Display Toast message in Asyctask in doInBackground method?
5) What is an Application Not Responding (ANR) error, and how can you prevent them from occurring in your app?
4) How to Display Toast message in Asyctask in doInBackground method?
5) What is an Application Not Responding (ANR) error, and how can you prevent them from occurring in your app?
6) Retrofit vs Volley? Which is the best to use in android?
7) Glide vs Picasso? Which is more efficient?
7) Glide vs Picasso? Which is more efficient?
8) If you nest a RelativeLayout inside a LinearLayout then which layout parameters will the RelativeLayout use?
a. RelativeLayout.layoutparams
b. Viewgroup.margin
c. Viewgroup.layoutParams
d. LinearLayout.layoutParams
9) In Photo sharing app, user receives new photo and a notification is created and the user clicks on the notification. What do you attach to the notification to open the app and show the user the photo?
a. RelativeLayout.layoutparams
b. Viewgroup.margin
c. Viewgroup.layoutParams
d. LinearLayout.layoutParams
9) In Photo sharing app, user receives new photo and a notification is created and the user clicks on the notification. What do you attach to the notification to open the app and show the user the photo?
a. intent
b. photoIntent
c. PendingIntent
d. Service
10) App that periodically checks if something is "working" What do you use?
a. Wake lock with power manager
b. setInexactRepeating
c. Post Handler
d. call set periodic timer
11) The user is in their text messaging app - they click share - how do you get your app to show up?
a. intent service
b. broadcast receiver
c. register content observer to telephone
d. register an intent filter
12) What is the difference between a fragment and an activity? Explain the relationship between the two?
13) What is difference between Serializable and Parcelable ? Which is best approach in Android ?
14) The last callback in the lifecycle of an activity is onDestroy(). The system calls this method on your activity as the final signal that your activity instance is being completely removed from the system memory. Usually, the system will call onPause() and onStop() before calling onDestroy().
b. photoIntent
c. PendingIntent
d. Service
10) App that periodically checks if something is "working" What do you use?
a. Wake lock with power manager
b. setInexactRepeating
c. Post Handler
d. call set periodic timer
11) The user is in their text messaging app - they click share - how do you get your app to show up?
a. intent service
b. broadcast receiver
c. register content observer to telephone
d. register an intent filter
12) What is the difference between a fragment and an activity? Explain the relationship between the two?
13) What is difference between Serializable and Parcelable ? Which is best approach in Android ?
14) The last callback in the lifecycle of an activity is onDestroy(). The system calls this method on your activity as the final signal that your activity instance is being completely removed from the system memory. Usually, the system will call onPause() and onStop() before calling onDestroy().
Describe a scenario, though, where onPause() and onStop() would not be invoked?
15) What is the relationship between the life cycle of an AsyncTask and an Activity? What problems can this result in? How can these problems be avoided?
16) What is UI/Main thread in Android
17) When can you use Thread over Service?
18) Explain detail about your favorite android API?
19) Difference between Views and Fragments?
20) Why are 2 boot loaders used in Android
21) What is binder in Android
22) What’s the difference between onCreate() and onStart()?
23) What are the various ways an Android developer can apply multi-threading to their app?
24) LinearLayout vs RelativeLayout
25) Describe image caching
26) What is the difference between a regular .png and a nine-patch image?
27) What is difference between Serializable and Parcelable? Which is best approach in Android?
28) What are the four essential states of an activity?
16) What is UI/Main thread in Android
17) When can you use Thread over Service?
18) Explain detail about your favorite android API?
19) Difference between Views and Fragments?
20) Why are 2 boot loaders used in Android
21) What is binder in Android
22) What’s the difference between onCreate() and onStart()?
23) What are the various ways an Android developer can apply multi-threading to their app?
24) LinearLayout vs RelativeLayout
25) Describe image caching
26) What is the difference between a regular .png and a nine-patch image?
27) What is difference between Serializable and Parcelable? Which is best approach in Android?
28) What are the four essential states of an activity?
The four essential states of an activity are:
30) Explain MVP? Advantages over MVC
- Active – if the activity is at the foreground
- Paused – if the activity is at the background and still visible
- Stopped – if the activity is not visible and therefore is hidden or obscured by another activity
- Destroyed – when the activity process is killed or completed terminated
30) Explain MVP? Advantages over MVC
31) Explain MVVM? Advantages over MVC and MVP
32) What are the things which you mention in Manifest File
33) Suppose your doInBackGround() is running, and you rotated your device,
What will happen?
34) Can we execute AsyncTask from another AsyncTask’s doInBackground() method?
33) Suppose your doInBackGround() is running, and you rotated your device,
What will happen?
34) Can we execute AsyncTask from another AsyncTask’s doInBackground() method?
35) Activity Life Cycle, in detail?
36) How will you send data between two Fragments
37) Difference between ListView and RecyclerView
38) Explain Job Scheduler in detail
39) Difference between notifyDataSetChanged and notifyItemChanged
40) What is the difference between Dynamic Receiver and Static Receiver. Which to use when?
36) How will you send data between two Fragments
37) Difference between ListView and RecyclerView
38) Explain Job Scheduler in detail
39) Difference between notifyDataSetChanged and notifyItemChanged
40) What is the difference between Dynamic Receiver and Static Receiver. Which to use when?
41) Which lifecycle method gets called when A goes to B/come back to A?
Activity Launch Modes with examples
42) Let’s say 4 activities are there A->B->C->D. How to launch A from D finishing in between activities?
43) 4 Activities are there A->B->C->D.How to finish application from D if none of the activities opened earlier finished till now?
44) How CLEAR_TOP flag intent works in android
45) Service vs IntentService?When to prefer which type of service?
46) Explain ways for Activity to activity communication/Activity to fragment communication/Fragment to fragment communication
47) How to make a service persist even after Application killed
48) How to handle Background service and execution limits with new Oreo Updates?
49) Why do we use Headless fragments?
50) Suppose you have 10 images to fetch from Server. What is the best way to fetch images?
51) Should we provide a context in presenter/Model? Answering yes/no is not enough. You have to provide a solution for it.
52) Why do we prefer Framelayout for Fragments?
53) How to make a custom view in android? Explain lifecycle methods.Difference between onLayout/onMeasure.
54) Have you ever faced any issue with SingleInstance launch mode or example if you have used it? Providing real-life examples are preferred more.
55) How to load Large Bitmaps? Handle Memory leaks and Sample sizing
56) How to retain data on orientation change? Explain lifecycle during orientation changes.
57) What the Fragment’s method setRetainInstance(boolean) does?
58) How to analyse and fix Activity transition flickering in android?
59) Main components of android
60) What are Activities Life cycles, explain with an Example?
61) Explain remote service.
62) Explain pending intent.
63) What is advantage of pending intent over intent?
64) Explain Broadcast Receivers with an Example
65) Explain content provider and content resolver.
66) Explain content provider and content resolver with help of a sample code.
67) What is .apk? How is it generated?
68) What is .aidl file? Can we use any different name instead of .aidl and create interface using any commands?
69) What are threads?
70) What are the two ways of implementing threads and which is the better one?
71) startBroadcast(), startOrderBroadcast() and startStickyBroadcast()
72) What are the different states of a thread?
73) Explain Widget in android?
74) Explain about android runtime environment.
75) What is a Launcher?
76) Explain init.c with respect to Dalvik Virtual Machine?
77) Explain Services?Different type of services?
78) Explain aidl interface and its implementation?
79) Explain remote service with examples?
80) Explain intent filter and intents?
81) If an activity ‘A’ starts activity ‘B’ and ‘B’ starts another activity ‘C’,what is the method to call to finish all activities?
82) Explain startService() and bindService()?
83) What is content Resolver?Is it a wrapper Class?
84) What is the difference between content receiver and content Provider?
85) Explain Service Lifecycle?
86) Local service and remote service?
87) What are Broadcast Receivers and how to register them statically and dynamically?
88) What are Content providers and how do we access the data?
89) What adb commands you have used?
90) What is manifest file? What all are mentioned in AndroidManifest.xml
91) What is category,action and data in intents and how they work?
92) Shared preference - how to get it?
93) Android listview and adapters
94) How android manage applications on low memory?
95) Pass data across different applications
96) How to start Activity of another application
97) How to use Bundles and pass parameters?
98) How to make an Activity to launch at start
99) Can we have two launcher Activities?
100) How to make onCreate execute multiple times?
101) How to get intent in a newly launched Activity
102) How to troubleshoot when adb is not detecting device
103) List some adb commands
104) If I want to save the state of activity,in which method of lifecycle , I have to store?
105) When OnsaveInstantState method will be called?
106) Difference between service and broadcast-receiver?
106) Difference between Activity and view
107) What is Shared Preference and difference with normal preference
108) What are the killable methods in Activity life cycle?
109) Can Activity run in background?
110) What is layout and what are the different types of layouts?
111) What is the difference between linear and relative layout?
112) Can linear layout be nested in relative layout and vice versa?
113) How to position the layout?
114) Diff b/w SimpleCursorAdapter and CursorAdapter
115) What is Handlers and its implementation.
116) How Library and frameWork layer communicating.
117) What is JNI.How it works.
118) Difference between cursor adapter and Simple cursor adapter.
119) How do you debug your application.
120) What are the different types of launch modes in Android and How to declare for Activity?
121) What is Application class?
122) What is Context? How is it used?
123) What is the structure of an Android Application?
124) What is the difference between a Fragment and an Activity? Explain the relationship between the two.
125) Why is it recommended to use only the default constructor to create a Fragment?
126) How would you communicate between two Fragments?
127) What is retained Fragment?
128) What is View in Android?
129) Difference between View.GONE and View.INVISIBLE?
130) What are ViewGroups and how they are different from the Views?
131) What is a canvas?
132) What is a SurfaceView?
133) What is Constraint Layout?
134) What is the difference between ListView and RecyclerView?
135) What is the ViewHolder pattern? Why should we use it?
136) What the difference between Dialog and Dialog Fragment?
137) What is a Sticky Intent?
138) Is it possible to run an Android app in multiple processes? How?
139) What can you use for background processing in Android?
140) How would you perform a long-running operation in an application?
141) Why should you avoid to run non-ui code on the main thread?
142) What are the problems in asynctask?
143) When would you use java thread instead of an asynctask?
144) What is a Loader?
145) Explain Looper, Handler and HandlerThread
146) How to persist data in an Android app?
147) What is ORM? How does it work?
148) How would you preserve Activity state during a screen rotation?
149) What are different ways to store data in your Android app?
150) What is a Spannable?
151) What is the onTrimMemory() method?
152) How does the OutOfMemory happens?
153) How do you find memory leaks in Android applications?
154) What is Doze? What about App Standby?
155) What is overdraw?
156) How did you support different types of resolutions?
157) What are the different protection levels in permission?
158) What is the Dalvik Virtual Machine?
159) What is the difference JVM, DVM and ART?
160) What is DEX?
161) Can you manually call the Garbage collector?
162) What is ADB?
163) What is Lint? What is it used for?
164) Why Bundle class is used for data passing and why cannot we use simple Map data structure
165) How do you troubleshoot a crashing application?
166) Explain Android notification system?
167) What is AAPT?
168) What is the best way to update the screen periodically?
169) HashMap, ArrayMap and SparseArray
170) What are Annotations?
171) What is the support library? Why was it introduced?
172) What is Android Data Binding?
173) What are Android Architecture Components?
174) Describe how REST APIs work. What is REST?
175) Reverse Engineering an APK.
176) What is proguard used for?
177) About multiple apk for android application
178) What is obfuscation? What is it used for? What about minification?
179) onSavedInstanceState() and onRestoreInstanceState() in activity?
180) How will you pass data to sub-activities?
181) Explain Fragment Life Cycle?
182) When activity is moved to stopped state, then what will happen to the life cycle of a fragment which is in that activity?
183) Is Fragment Life Cycle dependent on Activity Life Cycle?
184) How to call context in Fragment?
185) Explain the parameters of onCreateView()?
186) android.app.Fragment vs android.support.v4.app.Fragment?
187) How many ways to call Fragment?
188) What is FragmentManager Class?
189) Difference between Activity vs FragmentActivity?
190) How to handle the backPress in Fragment?
191) How to Persist data between configurations changes?
192) What is Headless Fragment?
193) How to begin the transaction?
194) Difference in adding and replacing a Fragment?
Activity Launch Modes with examples
42) Let’s say 4 activities are there A->B->C->D. How to launch A from D finishing in between activities?
43) 4 Activities are there A->B->C->D.How to finish application from D if none of the activities opened earlier finished till now?
44) How CLEAR_TOP flag intent works in android
45) Service vs IntentService?When to prefer which type of service?
46) Explain ways for Activity to activity communication/Activity to fragment communication/Fragment to fragment communication
47) How to make a service persist even after Application killed
48) How to handle Background service and execution limits with new Oreo Updates?
49) Why do we use Headless fragments?
50) Suppose you have 10 images to fetch from Server. What is the best way to fetch images?
51) Should we provide a context in presenter/Model? Answering yes/no is not enough. You have to provide a solution for it.
52) Why do we prefer Framelayout for Fragments?
53) How to make a custom view in android? Explain lifecycle methods.Difference between onLayout/onMeasure.
54) Have you ever faced any issue with SingleInstance launch mode or example if you have used it? Providing real-life examples are preferred more.
55) How to load Large Bitmaps? Handle Memory leaks and Sample sizing
56) How to retain data on orientation change? Explain lifecycle during orientation changes.
57) What the Fragment’s method setRetainInstance(boolean) does?
58) How to analyse and fix Activity transition flickering in android?
59) Main components of android
60) What are Activities Life cycles, explain with an Example?
61) Explain remote service.
62) Explain pending intent.
63) What is advantage of pending intent over intent?
64) Explain Broadcast Receivers with an Example
65) Explain content provider and content resolver.
66) Explain content provider and content resolver with help of a sample code.
67) What is .apk? How is it generated?
68) What is .aidl file? Can we use any different name instead of .aidl and create interface using any commands?
69) What are threads?
70) What are the two ways of implementing threads and which is the better one?
71) startBroadcast(), startOrderBroadcast() and startStickyBroadcast()
72) What are the different states of a thread?
73) Explain Widget in android?
74) Explain about android runtime environment.
75) What is a Launcher?
76) Explain init.c with respect to Dalvik Virtual Machine?
77) Explain Services?Different type of services?
78) Explain aidl interface and its implementation?
79) Explain remote service with examples?
80) Explain intent filter and intents?
81) If an activity ‘A’ starts activity ‘B’ and ‘B’ starts another activity ‘C’,what is the method to call to finish all activities?
82) Explain startService() and bindService()?
83) What is content Resolver?Is it a wrapper Class?
84) What is the difference between content receiver and content Provider?
85) Explain Service Lifecycle?
86) Local service and remote service?
87) What are Broadcast Receivers and how to register them statically and dynamically?
88) What are Content providers and how do we access the data?
89) What adb commands you have used?
90) What is manifest file? What all are mentioned in AndroidManifest.xml
91) What is category,action and data in intents and how they work?
92) Shared preference - how to get it?
93) Android listview and adapters
94) How android manage applications on low memory?
95) Pass data across different applications
96) How to start Activity of another application
97) How to use Bundles and pass parameters?
98) How to make an Activity to launch at start
99) Can we have two launcher Activities?
100) How to make onCreate execute multiple times?
101) How to get intent in a newly launched Activity
102) How to troubleshoot when adb is not detecting device
103) List some adb commands
104) If I want to save the state of activity,in which method of lifecycle , I have to store?
105) When OnsaveInstantState method will be called?
106) Difference between service and broadcast-receiver?
106) Difference between Activity and view
107) What is Shared Preference and difference with normal preference
108) What are the killable methods in Activity life cycle?
109) Can Activity run in background?
110) What is layout and what are the different types of layouts?
111) What is the difference between linear and relative layout?
112) Can linear layout be nested in relative layout and vice versa?
113) How to position the layout?
114) Diff b/w SimpleCursorAdapter and CursorAdapter
115) What is Handlers and its implementation.
116) How Library and frameWork layer communicating.
117) What is JNI.How it works.
118) Difference between cursor adapter and Simple cursor adapter.
119) How do you debug your application.
120) What are the different types of launch modes in Android and How to declare for Activity?
121) What is Application class?
122) What is Context? How is it used?
123) What is the structure of an Android Application?
124) What is the difference between a Fragment and an Activity? Explain the relationship between the two.
125) Why is it recommended to use only the default constructor to create a Fragment?
126) How would you communicate between two Fragments?
127) What is retained Fragment?
128) What is View in Android?
129) Difference between View.GONE and View.INVISIBLE?
130) What are ViewGroups and how they are different from the Views?
131) What is a canvas?
132) What is a SurfaceView?
133) What is Constraint Layout?
134) What is the difference between ListView and RecyclerView?
135) What is the ViewHolder pattern? Why should we use it?
136) What the difference between Dialog and Dialog Fragment?
137) What is a Sticky Intent?
138) Is it possible to run an Android app in multiple processes? How?
139) What can you use for background processing in Android?
140) How would you perform a long-running operation in an application?
141) Why should you avoid to run non-ui code on the main thread?
142) What are the problems in asynctask?
143) When would you use java thread instead of an asynctask?
144) What is a Loader?
145) Explain Looper, Handler and HandlerThread
146) How to persist data in an Android app?
147) What is ORM? How does it work?
148) How would you preserve Activity state during a screen rotation?
149) What are different ways to store data in your Android app?
150) What is a Spannable?
151) What is the onTrimMemory() method?
152) How does the OutOfMemory happens?
153) How do you find memory leaks in Android applications?
154) What is Doze? What about App Standby?
155) What is overdraw?
156) How did you support different types of resolutions?
157) What are the different protection levels in permission?
158) What is the Dalvik Virtual Machine?
159) What is the difference JVM, DVM and ART?
160) What is DEX?
161) Can you manually call the Garbage collector?
162) What is ADB?
163) What is Lint? What is it used for?
164) Why Bundle class is used for data passing and why cannot we use simple Map data structure
165) How do you troubleshoot a crashing application?
166) Explain Android notification system?
167) What is AAPT?
168) What is the best way to update the screen periodically?
169) HashMap, ArrayMap and SparseArray
170) What are Annotations?
171) What is the support library? Why was it introduced?
172) What is Android Data Binding?
173) What are Android Architecture Components?
174) Describe how REST APIs work. What is REST?
175) Reverse Engineering an APK.
176) What is proguard used for?
177) About multiple apk for android application
178) What is obfuscation? What is it used for? What about minification?
179) onSavedInstanceState() and onRestoreInstanceState() in activity?
180) How will you pass data to sub-activities?
181) Explain Fragment Life Cycle?
182) When activity is moved to stopped state, then what will happen to the life cycle of a fragment which is in that activity?
183) Is Fragment Life Cycle dependent on Activity Life Cycle?
184) How to call context in Fragment?
185) Explain the parameters of onCreateView()?
186) android.app.Fragment vs android.support.v4.app.Fragment?
187) How many ways to call Fragment?
188) What is FragmentManager Class?
189) Difference between Activity vs FragmentActivity?
190) How to handle the backPress in Fragment?
191) How to Persist data between configurations changes?
192) What is Headless Fragment?
193) How to begin the transaction?
194) Difference in adding and replacing a Fragment?
