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import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.CheckBox;
import android.widget.CompoundButton;

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        CheckBox fishCB = (CheckBox) findViewById(R.id.fishCB);

        if (fishCB.isChecked()) {
            fishCB.toggle();     // flips the checkbox to unchecked if it was checked
        }
        fishCB.setOnCheckedChangeListener(
                new CompoundButton.OnCheckedChangeListener() {
                    @Override
                    public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
                        Log.v("CheckBoxActivity", "The fish checkbox is now "
                                + (isChecked ? "checked" : "not checked"));
                    }
                }
        );
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
/*  ww  w.jav a 2  s .  co  m*/
    <CheckBox
        android:id="@+id/chickenCB"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"
        android:text="XML" />

    <CheckBox
        android:id="@+id/fishCB"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="CSS" />

    <CheckBox
        android:id="@+id/steakCB"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"
        android:text="HTML" />

</LinearLayout>