Question

I want to select only one checkbox among 4 checkboxes. I mean, If one checkbox is selected others should be disabled. how to achieve this?

Answer 1

If you use the generic onClick then you could run into future issues with other elements click handlers in your app. I would add android:onClick="onCheckboxClicked" to each CheckBox in your xml file. Then add the method I show below, customized to your id’s etc.

<CheckBox android:id="@+id/chkBx1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/Option 1"
        android:onClick="onCheckboxClicked"/>
<CheckBox android:id="@+id/chkBx2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/Option 2"
        android:onClick="onCheckboxClicked"/>
<CheckBox android:id="@+id/chkBx3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/Option 3"
        android:onClick="onCheckboxClicked"/>

Main Activity:

public void onCheckboxClicked(View v) {
    CheckBox chk1 = (CheckBox)findViewById(R.id.chkBx1);
    CheckBox chk2 = (CheckBox)findViewById(R.id.chkBx2);
    CheckBox chk3 = (CheckBox)findViewById(R.id.chkBx3);

    switch (v.getId()) {
    case R.id.chkBx1:
        if (chk1.isChecked()) {
            chk2.setEnabled(false);
            chk3.setEnabled(false);
        } else {
            chk1.setEnabled(true);
            chk2.setEnabled(true);
            chk3.setEnabled(true);
        }
        break;

    case R.id.chkBx2:
        if (chk2.isChecked()) {
            chk1.setEnabled(false);
            chk3.setEnabled(false);
        } else {
            chk1.setEnabled(true);
            chk2.setEnabled(true);
            chk3.setEnabled(true);
        }
        break;

    case R.id.chkBx3:
        if (chk3.isChecked()) {
            chk1.setEnabled(false);
            chk2.setEnabled(false);
        } else {
            chk1.setEnabled(true);
            chk2.setEnabled(true);
            chk3.setEnabled(true);
        }
        break;

    }
}