@BindingAdapter("expandTouchArea")
fun expandTouchArea(view: View, size: String) {
    view.postDelayed({
        val bounds = Rect()
        view.getHitRect(bounds)
        var left = 0
        var top = 0
        var right = 0
        var bottom = 0
        /*
        *  size 舉例 `2` or `2 4` or `2 4 6 8`
         */
        val mSize = size.trim()
        val ss = mSize.split(" ")
        when (ss.size) {
            1 -> {
                val sdp = (ss[0].toIntOrNull() ?: 0).idp()
                left = sdp
                top = sdp
                right = sdp
                bottom = sdp
            }
            2 -> {
                val sdp = (ss[0].toIntOrNull() ?: 0).idp()
                val sdp1 = (ss[1].toIntOrNull() ?: 0).idp()
                left = sdp
                top = sdp1
                right = sdp
                bottom = sdp1
            }
            4 -> {
                left = (ss[0].toIntOrNull() ?: 0).idp()
                top = (ss[1].toIntOrNull() ?: 0).idp()
                right = (ss[2].toIntOrNull() ?: 0).idp()
                bottom = (ss[3].toIntOrNull() ?: 0).idp()
            }
            else -> {
                return@postDelayed
            }
        }
        bounds.left -= left
        bounds.top -= top
        bounds.right += right
        bounds.bottom += bottom
        val mTouchDelegate = TouchDelegate(bounds, view);
        val p = view.parent
        if (p is ViewGroup) {
            p.touchDelegate = mTouchDelegate;
        }
    }, 100)
}

<CheckBox
    android:layout_width="14dp"
    android:layout_height="14dp"
    android:background="@drawable/ic_cb_common"
    android:button="@null"
    android:checked="false"
    app:expandTouchArea="@{`20 10 50 20`}"/>

//表示在View原有范圍的基礎(chǔ)上在四周增加20dp的區(qū)域
app:expandTouchArea="@{`20`}

//表示在View原有范圍的基礎(chǔ)上左右增加20dp, 上下增加10dp的區(qū)域
app:expandTouchArea="@{`20 10`}

//表示在View原有范圍的基礎(chǔ)上, 左上右下分別增加20dp 10dp 50dp 20dp的區(qū)域
app:expandTouchArea="@{`20 10 50 20`}