使RelativeLayout可检查(Make RelativeLayout checkable)

 我尝试使用带有TextView和FrameLayout RelativeLayout编写我自己的CheckBox （里面有选择器）。 
 
 我有setDuplicateParentStateEnabled(true) ，它从父级检查状态，但为什么使RelativeLayout检查我不知道。 
 
public class MyCheckbox extends RelativeLayout implements OnClickListener, Checkable
{
private static final int ID_CHECKBOX = -1234411;
private static final int ID_TEXTVIEW = -1234412;
private static final int ID_PARENT = -1234413;

private TextView textView;
private FrameLayout checkBox;
private boolean isChecked;

public MyCheckbox(Context context)
{
    this(context, null);
}

public MyCheckbox(Context context, AttributeSet attrs)
{
    super(context, attrs);

    LayoutParams lp;

    setId(ID_PARENT);
    setOnClickListener(this);

    // checkBox
    checkBox = new FrameLayout(context);
    checkBox.setId(ID_CHECKBOX);
    checkBox.setDuplicateParentStateEnabled(true);

    // textView
    textView = new TextView(context);
    textView.setId(ID_TEXTVIEW);
    textView.setOnClickListener(this);


    boolean checkboxToRight = false;

    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MaptrixCheckbox);

    for (int i = 0; i < a.getIndexCount(); i++)
    {
        int attr = a.getIndex(i);
        switch (attr)
        {
            case R.styleable.MyCheckbox_checkboxToRight:
                checkboxToRight = a.getBoolean(attr, false);
                break;

            case R.styleable.MyCheckbox_checkMark:
                checkBox.setBackgroundDrawable(a.getDrawable(attr));
                break;

            case R.styleable.MyCheckbox_text:
                textView.setText(a.getText(attr));
                break;
        }
    }
    a.recycle();

    if (checkboxToRight)
    {
        lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        lp.addRule(ALIGN_PARENT_RIGHT);
        lp.addRule(CENTER_VERTICAL);
        lp.setMargins(margins, 0, margins, 0);
        addView(checkBox, lp);

        lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        lp.addRule(CENTER_VERTICAL);
        lp.addRule(LEFT_OF, ID_CHECKBOX);
        addView(textView, lp);
    }
    else
    {
        lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        lp.addRule(CENTER_VERTICAL);
        lp.setMargins(margins, 0, margins, 0);
        addView(checkBox, lp);

        lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        lp.addRule(CENTER_VERTICAL);
        lp.addRule(RIGHT_OF, ID_CHECKBOX);
        addView(textView, lp);
    }

    refreshDrawableState();
}

@Override
public void onClick(View v)
{
    int id = v.getId();

    if (id == ID_PARENT || id == ID_TEXTVIEW) toggle();
}

public boolean isChecked()
{
    return isChecked;
}

public void setChecked(boolean chacked)
{
    isChecked = chacked;
    refreshDrawableState();
}

@Override
public void toggle()
{
    isChecked = !isChecked;
    refreshDrawableState();
}
}

I try to write my own CheckBox using RelativeLayout with TextView and FrameLayout (with selector on background) inside.
 
I have setDuplicateParentStateEnabled(true) for FrameLayout that it take checkable status from parent, but why make RelativeLayout checkable I don't know.
 
public class MyCheckbox extends RelativeLayout implements OnClickListener, Checkable
{
private static final int ID_CHECKBOX = -1234411;
private static final int ID_TEXTVIEW = -1234412;
private static final int ID_PARENT = -1234413;

private TextView textView;
private FrameLayout checkBox;
private boolean isChecked;

public MyCheckbox(Context context)
{
    this(context, null);
}

public MyCheckbox(Context context, AttributeSet attrs)
{
    super(context, attrs);

    LayoutParams lp;

    setId(ID_PARENT);
    setOnClickListener(this);

    // checkBox
    checkBox = new FrameLayout(context);
    checkBox.setId(ID_CHECKBOX);
    checkBox.setDuplicateParentStateEnabled(true);

    // textView
    textView = new TextView(context);
    textView.setId(ID_TEXTVIEW);
    textView.setOnClickListener(this);


    boolean checkboxToRight = false;

    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MaptrixCheckbox);

    for (int i = 0; i < a.getIndexCount(); i++)
    {
        int attr = a.getIndex(i);
        switch (attr)
        {
            case R.styleable.MyCheckbox_checkboxToRight:
                checkboxToRight = a.getBoolean(attr, false);
                break;

            case R.styleable.MyCheckbox_checkMark:
                checkBox.setBackgroundDrawable(a.getDrawable(attr));
                break;

            case R.styleable.MyCheckbox_text:
                textView.setText(a.getText(attr));
                break;
        }
    }
    a.recycle();

    if (checkboxToRight)
    {
        lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        lp.addRule(ALIGN_PARENT_RIGHT);
        lp.addRule(CENTER_VERTICAL);
        lp.setMargins(margins, 0, margins, 0);
        addView(checkBox, lp);

        lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        lp.addRule(CENTER_VERTICAL);
        lp.addRule(LEFT_OF, ID_CHECKBOX);
        addView(textView, lp);
    }
    else
    {
        lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        lp.addRule(CENTER_VERTICAL);
        lp.setMargins(margins, 0, margins, 0);
        addView(checkBox, lp);

        lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        lp.addRule(CENTER_VERTICAL);
        lp.addRule(RIGHT_OF, ID_CHECKBOX);
        addView(textView, lp);
    }

    refreshDrawableState();
}

@Override
public void onClick(View v)
{
    int id = v.getId();

    if (id == ID_PARENT || id == ID_TEXTVIEW) toggle();
}

public boolean isChecked()
{
    return isChecked;
}

public void setChecked(boolean chacked)
{
    isChecked = chacked;
    refreshDrawableState();
}

@Override
public void toggle()
{
    isChecked = !isChecked;
    refreshDrawableState();
}
}

原文：https://stackoverflow.com/questions/11775710