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- \lhead{ Simon Hammer}
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- \cfoot{Gymnasium Kirschgarten}
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- application programming interface (API)\\
- Android Native Development Kit (NDK) \\
- Application Binary Interface (ABI) \\
- Java Native Interface (JNI) \\
- Activity
- An activity is a single, focused thing that the user can do.
- Almost all activities interact with the user, so the Activity class takes care of creating a window for you in which you can place your UI with setContentView(View)
- Bundle
- Bundle is used to pass data between Activities.
- You can create a bundle, pass it to Intent that starts the activity which then can be used from the destination activity.
- Bundle:- A mapping from String values to various Parcelable types. Bundle is generally used for passing data between various activities of android.
- protected
- The protected keyword is an access modifier used for attributes, methods and constructors,
- making them accessible in the same package and subclasses.
- bundle
- Resource bundles contain locale-specific objects.
- When your program needs a locale-specific resource, a String for example,
- your program can load it from the resource bundle that is appropriate for the current user's locale. In this way,
- you can write program code that is largely independent of the user's locale isolating most, if not all,
- of the locale-specific information in resource bundles.
- savedInstandeState
- The savedInstanceState is a reference to a Bundle object that is passed into the onCreate method of every Android Activity.
- Activities have the ability, under special circumstances,
- to restore themselves to a previous state using the data stored in this bundle.
- If there is no available instance data, the savedInstanceState will be null. For example,
- the savedInstanceState will always be null the first time an Activity is started, but may be non-null if an Activity is destroyed during rotation.
- private
- The private keyword is an access modifier used for attributes,
- methods and constructors,
- making them only accessible within the declared class.
- super
- super referes to the parent class and use the construktor from parent class
- final
- A final viriable is not cheable, a final method can't be overriden, a final class can't be extended,
- a final variable has to be Initialized in the constructor.
- static
- A static method can be accessed without creating an object of the class first
- this
- The this keyword refers to the current object in a method or constructor
- synchronized
- Java provides a way of creating threads and synchronizing their task by using synchronized blocks. Synchronized blocks in Java are marked with the synchronized keyword.
- A synchronized block in Java is synchronized on some object.
- All synchronized blocks synchronized on the same object can only have one thread executing inside them at a time.
- All other threads attempting to enter the synchronized block are blocked until the thread inside the synchronized block exits the block.
- volatile
- Volatile keyword is used to modify the value of a variable by different threads. It is also used to make classes thread safe.
- It means that multiple threads can use a method and instance of the classes at the same time without any problem.
- instanceof
- checks if a variable is type of the following, it returns boolean
- System.gc()
- The java.lang.System.gc() method runs the garbage collector.
- Calling this suggests that the Java Virtual Machine expend effort
- toward recycling unused objects in order to make the memory they currently occupy available for quick reuse.
- threads
- Threads allows a program to operate more efficiently by doing multiple things at the same time.
- one-to-one
- A one-to-one relationship between two entities is a relationship where each instance of the parent entity corresponds to exactly one instance of the child entity, and vice-versa.
- Relation between Message and Attachment
- one-to-many
- A one-to-many relationship between two entities is a relationship where each instance of the parent entity corresponds to zero or more instances of the child entity,
- but each instance of the child entity can only correspond to exactly one instance of the parent entity.
- Maybe needed for Inbox.
- many-to-many
- A many-to-many relationship between two entities is a relationship where each instance of the parent entity corresponds to zero or more instances of the child entity, and vice-versa.
- \end{document}
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