Question

I am an android newbie so forgive me if this question is simple.

Basically I want to port over a java project to Android. By view components in my java application dynamically change depending on the model. I.e the model being display may require n check boxes or n radio boxes depending on the enum TYPE being passed to the view.

In my java display this is achieved by nested loops with the n number each time adding the component to the screen. e.g a simplified version of the code:

if (type == TYPE.CHECKBOXES){
for (int i = 0; i < n ; i++){
add(new JCheckBox()); 
}}

This is processed for the view each time a next button is pressed (the type changes each time). In android how do i dynamically add and remove components, or do i need to set up a new view for each type?

Many thanks
Sam

Answer 1

In Java you manage your layouts using JPanel alongwith specific layouts (i.e BorderLayout, FlowLayout etc.)
you add your components to JPanel and then add your JPanel to parent or root layout.

a little example (as you posted:)

if (type == TYPE.CHECKBOXES){
     for (int i = 0; i < n ; i++){
          mayPanel.add(new JCheckBox()); 
     }
}

In android you manage your layouts using ViewGroup which has specific subclassed layout design (i.e LinearLayout much like as FlowLayout, RelativeLayout may be considered BorderLayout)

You can use these layouts just like a JPanel

if (type == TYPE.CHECKBOXES){
     LinearLayout myPanel = new LinearLayout(this);
     for (int i = 0; i < n ; i++){
          CheckBox chk=new CheckBox(this);  
          chk.setText("Hello");
          myPanel.addView(chk); 
     }
     myRootPanel.addView(myPanel);
}

Just an addition: The Component in Java are called View in Android. Most of the control (also called widgets like Button, EditText, ImageButton, ImageView) in Android are subclass of View.