How to show pre checked checkboxes in android

Question

I have a problem
How do I show prechecked checkboxes in my android application.
Suppose there are 4 check boxes and I want to show 2 of them checked from the beginning based on a value 0 or 1 assigned to that display variable.
I am a very naive android developer.

Answer 1

You can either use xml property

<CheckBox
    android:id="@+id/cb1"
    .... 
    android:checked="true"
/>

or set in your code like

boolean isChecked = ...;
CheckBox cb1 = (CheckBox)findViewById(R.id.cb1);
cb1.setChecked(isChecked);

Answer 2

Vladimir's answer didn't work for me. Instead use this:

<CheckBox
...
android:state_checked="true" />

Answer 3

Just set your value in

checkBox.setTag("zero") or

checkBox.setTag("one")

and check like this ...

String str = (String) checkBox.getTag();

if(str.equals("zero") || str.equals("one") ){
checkBox.setChecked(true);
}