Question

For my project I need a functionality to dynamically add and remove views(textedit or buttons, etc).

I saw this similar functionality in Android “Add Contact” screen, where plus button add new fields and minus button delete the fields.

I found that EditContactActitivity.java is the file behind “Add Contacts”.

I tried to find the methods that are called when plus or minus buttons are pressed but unable to find it, seems like “Add Contact” code is spreaded over multiple files. I am having difficulty understanding Android source code because documentation is unavailable.
Any advice?

Answer 1

You can add and remove views by calling .add() or .remove() on the reference to your main layout and passing the view you wish to add or remove;

Here is a simple example of an onCreate method that demonstrates adding and removing a button:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    LinearLayout myMainLayout = (LinearLayout)findViewById(R.id.yourMainLayout);
    Button b = new Button(this);
    //you can have some b.setXXX calls here to set text, view, click listeners etc...
    myMainLayout.add(b);



    //to remove
    myMainLayout.remove(b);

}