Re: Digest for seattle-java-android-study-sessions@googlegroups.com - 5 Messages in 1 Topic

[Bob Marley]

Importing the project I am getting the following errors.

-miene

Description Resource Path Location Type

The method eventOccurred(EventObject) of type new SpiteEventListener(){} must override a superclass method Ball.java /Vivace/src/com/vivace/sprite line 25 Java Problem

The method eventOccurred(EventObject) of type new SpiteEventListener(){} must override a superclass method Vivace.java /Vivace/src/com/vivace line 61 Java Problem

The method onClick(View) of type new View.OnClickListener(){} must override a superclass method Vivace.java /Vivace/src/com/vivace line 104 Java Problem

The method onClick(View) of type new View.OnClickListener(){} must override a superclass method Vivace.java /Vivace/src/com/vivace line 119 Java Problem

The method onProgressChanged(SeekBar, int, boolean) of type Preferences must override a superclass method Preferences.java /Vivace/src/com/vivace line 46 Java Problem

The method onStartTrackingTouch(SeekBar) of type Preferences must override a superclass method Preferences.java /Vivace/src/com/vivace line 52 Java Problem

The method onStopTrackingTouch(SeekBar) of type Preferences must override a superclass method Preferences.java /Vivace/src/com/vivace line 56 Java Problem

The method onTouch(View, MotionEvent) of type new View.OnTouchListener(){} must override a superclass method Vivace.java /Vivace/src/com/vivace line 88 Java Problem

The method run() of type DrawEngine must override a superclass method DrawEngine.java /Vivace/src/com/vivace line 22 Java Problem

On Mon, Jan 9, 2012 at 4:22 PM, <seattle-java-andr...@googlegroups.com> wrote:

  Today's Topic Summary

Group: http://groups.google.com/group/seattle-java-android-study-sessions/topics

• getting the Vivace code: [5 Updates]

 getting the Vivace code:

Jose Collas <jose....@goatstone.com> Jan 09 02:21PM -0800  

Getting the Code:
 
the git command:
 
git clone g...@github.com:goatstone/Vivace.git
 
 
Go to Eclipse, under:
File ->
New -> Android Project
 
When the dialog appears:
For Name put in:
 
Vivace
 
click:
"Create project from existing source"
 
and under "Location" select the folder you have just cloned from
github "Vivace"
 
and click
 
"Finnish"


 

Jose Collas <jose....@goatstone.com> Jan 09 02:25PM -0800  

Basic UI: View, ViewGroups : Intents, Activities : Life Cycle


 

Jose Collas <jose....@goatstone.com> Jan 09 02:26PM -0800  

Basic UI: View, ViewGroups : Intents, Activities : Life Cycle


 

Jose Collas <jose....@goatstone.com> Jan 09 03:24PM -0800  

Notes for the study session 1.9.2012
 
"View, ViewGroups : Intents, Activities : Life Cycle"
 
======================
Views
 
Extends Object
 
Built in:
Button restart
 
Custom to Vivace:
SpriteCanvas spriteCanvas
 
"This class represents the basic building block for user interface
components."
"View is the base class for widgets, which are used to create
interactive UI components (buttons, text fields, etc.)."*
 
 
======================
ViewGroups
 
Extends View
 
Application ViewGroups:
MainLayout(Programmatic)
Preferences(XML)
 
The Base class for layouts
 
"A ViewGroup is a special view that can contain other views (called
children.)
The view group is the base class for layouts and views containers.
This class also defines the ViewGroup.LayoutParams class
which serves as the base class for layouts parameters."*
 
It can be defined with XML or with code. What are the pros and cons of
the two?
 
 
======================
Intents
 
Vivace uses intents to navigate from the Main screen to the
Preferences screen.
 
"An intent is an abstract description of an operation to be performed.
It can be used with startActivity to launch an Activity,"*
 
Intent intent = new Intent(spriteCanvas.getContext(),
Preferences.class);
// intent.putExtra("ballSize", String.valueOf(ballSize));
intent.putExtra("ballSize", String.valueOf((int) Ball.rad));
// startActivity(intent);
startActivityForResult(intent, 1);
 
 
======================
Activities
 
"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)."*
 
The example app. Vivace has two Activities:
 
Vivace
Preferences
 
The activity Vivacy is the main screen while, Preferences only
modifies a user preference.
The Activity Preferences takes a dotSize value and returns dotSize
value that the user has selected.
This Activity simply gets a value and returns a value, promoting
Activity independence.
 
 
======================
Object Independence With Events.
This is about Java not Android specifically.
I am only suggesting and experimenting with this in the context of
Android.
How else can this be done?
How do different classes communicate?
 
In Vivace the Sprites have a event system.
The Ball objects raise BallCaught events and scoring is done based on
these.
 
In the com.vivace.event package:
 
interface SpiteEventListener extends EventListener
 
class BallCaught extends EventObject
public BallCaught(Object source, int points) {
super(source);
this.points = points;
}
 
 
Inside Sprite:
 
public void setSpriteListener(SpiteEventListener listener) {
events.add(listener);
}
 
 
protected void trigger(EventObject evt) {
for (Object o : events) {
((SpiteEventListener) o).eventOccurred(evt);
}
}
 
Inside Vivace:
// b is the sprite 'Ball'.
b.setSpriteListener(new SpiteEventListener() {
@Override
public void eventOccurred(EventObject evt) {
if (evt.getClass().getSimpleName().equals("BallCaught")) {
// do something when the "BallCaught" event occurs
}
}
});
 
Inside Ball:
// trigger the event BallCaught with the points for this ball
trigger(new BallCaught(this, points));
 
// listen for the events internally
setSpriteListener(new SpiteEventListener() {
public void eventOccurred(EventObject evt) {
// do something when the event occurs
}
});
 
 
 
* Quotes from Google Reference Site:
http://developer.android.com/reference/


 

Jose Collas <jose....@goatstone.com> Jan 09 03:25PM -0800  

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