What are return types of Startactivityforresult () in android?
Options 1) RESULT_OK 2) RESULT_CANCEL 3) RESULT_CRASH 4) A & B.
What is the purpose of super onCreate () in Android Mcq?
Q 9 – What is the purpose of super. onCreate() in android? The super. onCreate() will create the graphical window for subclasses and place at onCreate() method.
What is an activity in Android Mcq?
A) An activity is a window that contains the user interface of your application. … An application can have zero or more activities. C) An application can have only one activity. D) Option A and B are correct.
What are the debugging techniques available in Android?
Debugging in Android Studio
- Start debug mode. When you want to start the debugging mode, first make sure your device is setup for debugging and connected to USB, and open your project in Android Studio (AS) and just click the Debug icon. …
- Debug using Logs. The easiest way to debug your code is to use Log. …
- Logcat. …
4 февр. 2016 г.
How do I use startActivityForResult?
The android startActivityForResult method, requires a result from the second activity (activity to be invoked). In such case, we need to override the onActivityResult method that is invoked automatically when second activity returns result.
What are the main components in Android?
Introduction. There are four main Android app components: activities , services , content providers , and broadcast receivers . Whenever you create or use any of them, you must include elements in the project manifest.
What is the onCreate method Android?
On activity creation, the activity enters the Created state. In the onCreate() method, you perform basic application startup logic that should happen only once for the entire life of the activity.
Is it possible activity without UI in Android?
The answer is yes it’s possible. Activities don’t have to have a UI. It’s mentioned in the documentation, e.g.: An activity is a single, focused thing that the user can do.
What is the package name of HTTP client in Android?
Android includes two HTTP clients: HttpURLConnection and Apache HTTP Client. Both support HTTPS, streaming uploads and downloads, configurable timeouts, IPv6 and connection pooling.
How do you kill an activity?
Launch your application, open some new Activity, do some work. Hit the Home button (application will be in the background, in stopped state). Kill the Application — easiest way is to just click the red “stop” button in Android Studio. Return back to your application (launch from Recent apps).
What is ANR Android?
When the UI thread of an Android app is blocked for too long, an “Application Not Responding” (ANR) error is triggered. If the app is in the foreground, the system displays a dialog to the user, as shown in figure 1. The ANR dialog gives the user the opportunity to force quit the app.
What is an activity?
An activity provides the window in which the app draws its UI. This window typically fills the screen, but may be smaller than the screen and float on top of other windows. Generally, one activity implements one screen in an app.
What is USB Debugging in Android?
In short, USB Debugging is a way for an Android device to communicate with the Android SDK (Software Developer Kit) over a USB connection. It allows an Android device to receive commands, files, and the like from the PC, and allows the PC to pull crucial information like log files from the Android device.
What debugging means?
Definition: Debugging is the process of detecting and removing of existing and potential errors (also called as ‘bugs’) in a software code that can cause it to behave unexpectedly or crash. … Debugging tools (called debuggers) are used to identify coding errors at various development stages.
What is a debug app?
A “debug app” is the app that you want to debug. … By the time you see this dialog, you can (set break up points and) attach your debugger, then the app launch will resume. There are two ways you can set your debug app – via the developer options in your device settings or via an adb command.