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Q:

Where can you test Apple iPhone apps if you don’t have the device?

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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Subject: Application Development

Q:

Explain the correct way to manage Outlets memory?

Answer

Create them as properties in the header that are retained. In the viewDidUnload set the outlets to nil(i.e self.outlet = nil). Finally in dealloc make sure to release the outlet.

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Subject: Application Development

Q:

If I call performSelector:withObject:afterDelay: – is the object retained?

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.

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Subject: Application Development

Q:

Whats the difference between a NSArray and a NSMutableArray?

Answer

A NSArray’s contents can not be modified once it’s been created whereas a NSMutableArray can be modified as needed, i.e items can be added/removed from it.

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Subject: Application Development

Q:

Whats a struct?

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.

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Subject: Application Development

Q:

How will you launch an Activity within you application?

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, MyTestActivity.class);


        startActivity(intent);

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Subject: Application Development

Q:

How can your application perform actions that are provided by other application e.g. sending email?

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(Intent.ACTION_SEND);


        intent.putExtra(Intent.EXTRA_EMAIL, recipientArray);


        startActivity(intent);

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Subject: Application Development

Q:

Write code snippet to retrieve IMEI number of Android phone?

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(Context.TELEPHONY_SERVICE);


        String imei = mTelephonyMgr.getDeviceId();

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Subject: Application Development