declare-styleable的详细用法

1.在resource中定义declare-styleable。

<declare-styleable name="SmileRating">    <attr name="angryColor" format="color" />    <attr name="normalColor" format="color" />    <attr name="drawingColor" format="color" />    <attr name="showLine" format="boolean" />    <attr name="placeHolderSmileColor" format="color" />    <attr name="placeHolderBackgroundColor" format="color" />    <attr name="textSelectionColor" format="color" />    <attr name="textNonSelectionColor" format="color" /></declare-styleable>
2.使用：<com.XXX.XXXView>   
 android:id="@+id/ratingView"    android:layout_width="match_parent"    android:layout_height="wrap_content"    app:angryColor="#fff"    android:layout_centerVertical="true" />

3.在构造方法中获取属性值（注意getColor的key格式）

TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.SmileRating);Color1 = a.getColor(R.styleable.SmileRating_angryColor, defValue);Color2 = a.getColor(R.styleable.SmileRating_normalColor, defValue);Color3 = a.getColor(R.styleable.SmileRating_drawingColor, defValue);a.recycle();