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- Question
How will you launch an Activity within you application?
- Correct Answer
- For launching an application, we will need to create an intent that explicitly defines the activity that we wish to start For example: Code Intent intent = new Intent(this, MyTestActivityclass); startActivity(intent);
- 1. How can your application perform actions that are provided by other application e.g. sending email? Discuss
- 2. Write code snippet to retrieve IMEI number of Android phone? Discuss
- 3. How does an application run in isolation from other applications? Discuss
- 4. Why cannot you run standard Java bytecode on Android? Discuss
- 5. How to select more than one option from list in android xml file? Give an example. Discuss
- 6. Whats a struct? Discuss
- 7. Whats the difference between a NSArray and a NSMutableArray? Discuss
- 8. If I call performSelector:withObject:afterDelay: ? is the object retained? Discuss
- 9. Explain the correct way to manage Outlets memory? Discuss
- 10. Where can you test Apple iPhone apps if you don?t have the device? Discuss
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Correct Answer: Intents are created to define an action that we want to perform and the launches the appropriate activity from another application Code Intent intent = new Intent(IntentACTION_SEND); intentputExtra(IntentEXTRA_EMAIL, recipientArray); startActivity(intent);
Correct Answer: TelephonyManager class can be used to get the IMEI number It provides access to information about the telephony services on the device Code TelephonyManager mTelephonyMgr = (TelephonyManager) getSystemService(ContextTELEPHONY_SERVICE); String imei = mTelephonyMgrgetDeviceId();
Correct Answer: Each application gets its own Linux user ID and virtual machine which means that the application code runs in isolation from other applications
Correct Answer: Android uses Dalvik Virtual Machine (DVM) which requires a special bytecode We need to convert Java class files into Dalvik Executable files using an Android tool called "dx" In normal circumstances, developers will not be using this tool directly and build tools will care for the generation of DVM compatible files
Correct Answer: Specify android id, layout height and width as depicted in the following example
Correct Answer: A struct is a special C data type that encapsulates other pieces of data into a single cohesive unit Like an object, but built into C
Correct Answer: A NSArray?s contents can not be modified once it?s been created whereas a NSMutableArray can be modified as needed, ie items can be added/removed from it
Correct Answer: Yes the object is retained It creates a timer that calls a selector on the current threads run loop It may not be 100% precise time-wise as it attempts to dequeue the message from the run loop and perform the selector
Correct Answer: Create them as properties in the header that are retained In the viewDidUnload set the outlets to nil(ie selfoutlet = nil) Finally in dealloc make sure to release the outlet
Correct Answer: iOS Simulator can be used to test mobile applications Xcode tool that comes along with iOS SDK includes Xcode IDE as well as the iOS Simulator Xcode also includes all required tools and frameworks for building iOS apps However, it is strongly recommended to test the app on the real device before publishing it
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