Questions in: Android Developer

Right Answer:
An Intent filter is a declaration in an Android app's manifest file that specifies the types of intents that an activity, service, or broadcast receiver can respond to. It allows the Android system to match intents with the appropriate components based on the specified actions, categories, and data types.

Right Answer:
If `finish()` is called in `onCreate()`, the guaranteed callback methods that will be called are `onPause()` and `onStop()`.

Right Answer:
The `do-while` loop will execute the body of the loop even when the condition controlling the loop is initially false.

Right Answer:
The `commit()` method saves changes to `SharedPreferences` synchronously and returns a boolean indicating success or failure, while the `apply()` method saves changes asynchronously without returning a result, making it more efficient for performance.

Right Answer:
ArrayList

Right Answer:
Hashtable

Right Answer:
Using the main UI thread (also known as the main thread) cannot be used to do non-UI tasks in Android.

Right Answer:
The `onUpgrade()` method in SQLite is called when the database version number is increased.

Right Answer:
Method overloading is a feature in Java that allows a class to have multiple methods with the same name but different parameters (different type, number, or both).

Right Answer:
The callback method is `onCreate()`.

Right Answer:
StringBuffer is thread safe.

Right Answer:
The TreeSet interface in Java is a part of the Java Collections Framework that implements the Set interface. It stores elements in a sorted order, based on their natural ordering or a specified comparator. TreeSet does not allow duplicate elements and provides efficient operations for adding, removing, and searching for elements.

Right Answer:
To declare an abstract method in an abstract Java class, you use the `abstract` keyword in the method signature, and you do not provide a body for the method. For example:

```java
abstract class MyClass {
abstract void myAbstractMethod();
}
```

Right Answer:
The 10x10 pixels image in the drawable-hdpi directory will be scaled up to fit the xhdpi device's density, resulting in a larger image that may appear pixelated or blurry when displayed in the ImageView with wrap_content.

Right Answer:
The rocket carrier PSLV-C37 was launched from Satish Dhawan Space Centre, Sriharikota, India.

Right Answer:
To generate a GCM (Google Cloud Messaging) token, you need to set up a Firebase project, configure your Android app with the necessary Firebase services, and use the Firebase Cloud Messaging (FCM) API to request a token.

Right Answer:
Android permissions in Marshmallow are divided into two categories: normal permissions and dangerous permissions.

Right Answer:
The minSdkVersion for the app can be set to the minimum API level required by the lower version of the support libraries being used, which is typically API level 4 (Android 1.6) for v4 and API level 7 (Android 2.1) for v7. Therefore, the minSdkVersion should be at least 7.

Right Answer:
A Handler instance can be used to send messages from a background thread to the main (UI) thread.

Right Answer:
The maximum size of the payload that can be sent in a GCM (Google Cloud Messaging) push notification is 4 KB (kilobytes).