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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:

How does an application run in isolation from other applications?

Answer

Each application gets its own Linux user ID and virtual machine which means that the application code runs in isolation from other applications.

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Subject: Application Development

Q:

What is the importance of XML-based layouts?

Answer

The use of XML-based layouts provides a consistent and somewhat standard means of setting GUI definition format. In common practice, layout details are placed in XML files while other items are placed in source files.

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Subject: Application Development

Q:

When is the onStop() method invoked?

Answer

A call to onStop method happens when an activity is no longer visible to the user, either because another activity has taken over or if in front of that activity.

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Subject: Application Development

Q:

When is the best time to kill a foreground activity?

Answer

The foreground activity, being the most important among the other states, is only killed or terminated as a last resort, especially if it is already consuming too much memory. When a memory paging state has been reach by a foreground activity, then it is killed so that the user interface can retain its responsiveness to the user.


 

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Subject: Application Development

Q:

What is the difference between a regular bitmap and a nine-patch image?

Answer

In general, a Nine-patch image allows resizing that can be used as background or other image size requirements for the target device. The Nine-patch refers to the way you can resize the image: 4 corners that are unscaled, 4 edges that are scaled in 1 axis, and the middle one that can be scaled into both axes.


 

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Subject: Application Development

Q:

What is the function of an intent filter?

Answer

Because every component needs to indicate which intents they can respond to, intent filters are used to filter out intents that these components are willing to receive. One or more intent filters are possible, depending on the services and activities that is going to make use of it.

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Subject: Application Development

Q:

What Is the Google Android SDK?

Answer

The Google Android SDK is a toolset that developers need in order to write apps on Android enabled devices. It contains a graphical interface that emulates an Android driven handheld environment, allowing them to test and debug their codes.

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Subject: Application Development