RadioButton.java

package me.arkty.views;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.Checkable;
import android.widget.FrameLayout;

/**
 * Author: Andrey Khitryy
 * Email: andrey.khitryy@gmail.com
 */
public class RadioButton extends FrameLayout implements Checkable {

    private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
    private boolean checked;

    public RadioButton(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    protected void setContentLayout(int layoutId) {
        inflate(getContext(), layoutId, this);
    }

    @Override
    public int[] onCreateDrawableState(final int extraSpace) {
        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
        if (isChecked())
            mergeDrawableStates(drawableState, CHECKED_STATE_SET);
        return drawableState;
    }

    @Override
    public void setChecked(boolean checked) {
        if (this.checked == checked)
            return;
        this.checked = checked;
        refreshDrawableState();
    }

    @Override
    public boolean isChecked() {
        return checked;
    }

    @Override
    public void toggle() {
        setChecked(!checked);
    }

    @Override
    public boolean performClick() {
        toggle();
        return true;
    }
}