Bound service
Started services are great for background operations, but what if you need a service that’s more…
AsyncTask
An AsyncTask lets you perform operations in the background. When they’ve finished running, it then allows…
changeCursor()
Cursors don’t automatically keep trac of whether the underlying data in the dabase has changed. So…
Database cursor
A cursor lets you read from and write tot the database.Youe specify what data you want…
SQLite database
Android stores data in SQLite database. Why SQLite? Its lightweightSQLite database is just a file. When…
ListView
The most basic way to connect items to a ListView (static data) res/values/strings.xml The ListView in…
AppCompatActivity class
The AppCompatActivity class is a subclass of Activity. It lives in the AppCompat Support Library, and…
Support Libraries
The Android Support Libraries provide backward compatibility with older versions of Android. THey sit outside the…
Fragments lifecycle
Activity states Fragment callbacks Activity created onAttach() onCreate() onCreateView() onActivityCreated() onAttach(Context)This happens when the fragment is…
What fragment code looks like
When you create a fragment, Android Studio creates two files for you: Java code for the…
How to add a fragment to a project
To add a fragment to your project… highlight the folder “app/src/main/java Go to “File” in menu…
Fragments explaination
What if you want your app to look and behave differently depending on whether itÄs running…
android:gravity
android:gravity=”value” android:gravity lets you say where you want the view’s contents to appear inside the view…
android:layout_gravity
android:layout_gravity lets you say where you want views to appear in their available space. android:layout_gravity deals…
LinearLayout
How you specify a linear layout You specify a linear layout using <LinearLayout>. You must specify…
The State of an activity
When Android creates and destroys an activity, the activity moves from being launched to running to…
Handlers allow you to schedule code
In non-Android Java, you can perform tasks like using a background thread. In Android, that approach…
AndroidManifest.xml
Every Android app must include a file called AndroidManifest.xml. You can find it in the app/src/main…
Use a custom Class in Android Studio
Add a cutom class to an Android project by going to File menu -> New ->…
findViewById()
We can get references for our two GUI components using a method called findViewById(). This method…
String Resource Files
string.xml is the default resource file used to hold name/value pairs of Strings sot that they…
Static variables
A static variables value is the same for aALL instances of the class…The static duckCount variable…
About inheritance
Simple rules for building a better inheritance design. DO use inheritance when one class is a…