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Android Interview Questions
Standard : This launch mode generates a new instance of the activity in the task from which it originated. It is possible to create multiple instances of the same activity, which can be added to the same or different tasks.

SingleTop : This launch mode is similar to the Standard launch mode, except if there exists a previous instance of the activity on the top of the stack, then a new instance will not be created, but the intent will be sent to the existing instance of the activity.

SingleTask : This launch mode will always create a new task and push a new instance to the task as the root one.

SingleInstance : This launch mode is the same as the SingleTask launch mode but the system doesn’t launch any new activities in the same task. In a scenario where the new activity is launched, it is launched in a separate task.
The XML based layouts help inconsistent and standard format for setting up of GUI definition format. The layout details are placed in XML files, and the other items are put in source files.
Yes, we need Android in the mobile market because it helps the users of smartphones to download applications that can provide a variety of services. The developers make various applications year after year. Android system gives them a platform from which they can display these applications to the smartphone users and find potential customers out of them. Android system offers paid and free applications for the users that could secure their data, act as a platform for information, and provide a variety of services as per the needs of the customers.
Yes, three key loops monitoring an activity. These include the following.
 
Loop 1 : Entire Lifetime : In this key loop, the activity happens between the onCreate and onDestroy.
Loop 2 : Visible Lifetime : In this key loop, the activity happens between onStart and onStop.
Loop 3 : Foreground Lifetime : In this key loop, the activity happens between onResume and onPause.
There are quite a few mobile automation testing tools that are available in the market but these are used only if the project requires it and if the application supports the automation.
 
These tools are paid as well as free tools, hence analysis needs to be done within the project team and then the appropriate mobile automation tool needs to be selected. Silk Mobile, SeeTest, Ranorex are the paid mobile automation tool while Appium, KIF, Robotium, Calabash are few free tools.
Free up memory space : There is only limited space available on mobile devices for mobile apps. To avoid crashing issues or memory-related issues, you need to first check the memory space.

Clear app data usage : You can clear the app data using the Application Manager under “Settings”. This will clear the cache memory and allow some free space to install another app or it will boost up your current app.

Memory Management : Some apps run perfectly on one type of mobile device but the same app may not work on another type of device as for such devices the processing power, memory management, and CPU speed is different. For any app to run properly on any type of mobile device, you should manage the memory on the device.

Compatibility issue : It is always not possible to test mobile apps on all mobile devices, browsers, operating systems, etc. So you need to test your mobile app on as many mobile devices as you can in order to avoid any compatibility issue.
Android Studio is using Android Device Manager (ADM), this ADM is used to detect the memory leaks in the Android platform.
 
When you open ADM in the Android Studio then on the left-hand side of the ADM, you will find your device or emulator in which a heap sign will be displayed. When you are running any mobile app then you will see the heap size, memory analysis and other statistics displayed on it.