180 lines
3.4 KiB
Plaintext
180 lines
3.4 KiB
Plaintext
|
Application
|
|||
|
|
Programming
|
|||
|
|
Hend Alkittawi
|
|||
|
|
|
|||
|
|
Leaderboard App
|
|||
|
|
An App to Demo File IO, Exception
|
|||
|
|
Handling, Scroll Views and Dynamic
|
|||
|
|
Image Loading
|
|||
|
|
|
|||
|
|
ANDROID APP DEVELOPMENT
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
Roadmap
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
Gather requirements
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
Design views
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
Design model classes
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
(layout xml files - setup views ids)
|
|||
|
|
(classes to represent app data)
|
|||
|
|
|
|||
|
|
Design controller
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
(classes to connect the views and model classes with methods
|
|||
|
|
to handle user interactions and to manage the data flow and
|
|||
|
|
update views)
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
Create your data files
|
|||
|
|
|
|||
|
|
ANDROID APP DEVELOPMENT
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
At this point we have most of the tools needed to create an
|
|||
|
|
application.
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
To create an application, start by gathering requirements based on
|
|||
|
|
which tasks and subtasks can be identified.
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
Important questions to ask
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
What is the main purpose of the application?
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
How will the user interact with it?
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
What technology will we use?
|
|||
|
|
|
|||
|
|
WRITING DATA TO A FILE
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
The Assets folder is read-only, we cannot write data to the files
|
|||
|
|
in the Assets folder.
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
What if we need to modify data within a file located in the Assets
|
|||
|
|
folder or create a file for both reading and writing data?
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
A work around this is to create a copy of the file from the Assets
|
|||
|
|
to the AVD memory, then use the “copy file” for reading and writing
|
|||
|
|
data.
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
To write data to a file, create a file in the AVD memory.
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
Once created, the file can be located in the AVD memory by
|
|||
|
|
navigating to View > Tool Windows > Device Explorer then data >
|
|||
|
|
user > 0 > edu.utsa.cs3443.projectName > files
|
|||
|
|
|
|||
|
|
SCROLL VIEWS
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
A ScrollView is a view group that allows the view hierarchy
|
|||
|
|
placed within it to be scrolled.
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
A ScrollView may have only one direct child placed within it.
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
To add multiple views within the ScrollView, make the direct
|
|||
|
|
child you add a view group, for example LinearLayout, and
|
|||
|
|
place additional views within that LinearLayout.
|
|||
|
|
<ScrollView
|
|||
|
|
android:layout_width="match_parent"
|
|||
|
|
android:layout_height="match_parent">
|
|||
|
|
<TextView
|
|||
|
|
android:layout_width="match_parent"
|
|||
|
|
android:layout_height="wrap_content" />
|
|||
|
|
</ScrollView>
|
|||
|
|
|
|||
|
|
IMAGE VIEWS
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
An ImageView can display an image from the drawable folder
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
statically (hard-code)
|
|||
|
|
<ImageView
|
|||
|
|
android:layout_width="wrap_content"
|
|||
|
|
android:layout_height="wrap_content"
|
|||
|
|
android:src="@drawable/rowdylogo"/>
|
|||
|
|
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
dynamically (xml and controller class)
|
|||
|
|
<ImageView
|
|||
|
|
android:layout_width="wrap_content"
|
|||
|
|
android:layout_height="wrap_content"
|
|||
|
|
android:id="@+id/dynamic_image" />
|
|||
|
|
|
|||
|
|
public void displayImage(String filename){
|
|||
|
|
ImageView dynamicImage = (ImageView) findViewById(R.id.dynamic_image);
|
|||
|
|
int imageResource = getResources().getIdentifier(filename, "drawable", getPackageName());
|
|||
|
|
dynamicImage.setImageResource(imageResource);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
DYNAMIC LOADING OF VIEWS
|
|||
|
|
-
|
|||
|
|
|
|||
|
|
MainActivity can dynamically place buttons in its layout
|
|||
|
|
(screen)
|
|||
|
|
private void dynamicSetupButton(String player){
|
|||
|
|
// create a layout object
|
|||
|
|
LinearLayout rootLayout = (LinearLayout) findViewById(R.id.root_layout);
|
|||
|
|
Button myButton = new Button(this);
|
|||
|
|
myButton.setText(player);
|
|||
|
|
myButton.setOnClickListener(new View.OnClickListener() {
|
|||
|
|
@Override
|
|||
|
|
public void onClick(View view) { Log.i(TAG, "Clicked on " + myButton.getText()); }
|
|||
|
|
});
|
|||
|
|
// setup the attributes for the button
|
|||
|
|
LinearLayout.LayoutParams buttonAttributes
|
|||
|
|
= new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
|
|||
|
|
LinearLayout.LayoutParams.WRAP_CONTENT);
|
|||
|
|
// add the button to the layout
|
|||
|
|
rootLayout.addView(myButton, buttonAttributes);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
DO YOU HAVE ANY
|
|||
|
|
QUESTIONS?
|
|||
|
|
|
|||
|
|
THANK
|
|||
|
|
YOU!
|
|||
|
|
|
|||
|
|
@
|
|||
|
|
|
|||
|
|
hend.alkittawi@utsa.edu
|
|||
|
|
|
|||
|
|
By Appointment
|
|||
|
|
Online
|
|||
|
|
|
|||
|
|
|