创建DefaultBindingAdapter

当下几乎所有的开发都基于mvvm 即databinding

GradientDrawable

    /**
     * shape {@link GradientDrawable#RECTANGLE,GradientDrawable#OVAL,GradientDrawable#LINE,GradientDrawable#RING}
     * 分别为 0，1，2，3
     *
     * @param view
     * @param solid
     */
    @BindingAdapter(value = {"shape", "solid", "strokeWidth", "strokeColor", "radius", "radiusLeftTop", "radiusLeftBottom", "radiusRightTop", "radiusRightBottom"},requireAll = false)
    public static void gradientDrawable(View view, int shape, int solid, int strokeWidth, int strokeColor, int radius, int radiusLeftTop, int radiusLeftBottom, int radiusRightTop, int radiusRightBottom) {
        float[] floats;
        if (radius > 0) {
            floats = new float[]{radius, radius, radius, radius, radius, radius, radius, radius};
        } else {
            floats = new float[]{radiusLeftTop, radiusLeftTop, radiusRightTop, radiusRightTop, radiusRightBottom, radiusRightBottom, radiusLeftBottom, radiusLeftBottom};
        }
        view.setBackground(GradientDrawableFactory.createDrawable(shape, solid, strokeWidth, strokeColor, floats));
    }

使用

<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <data>

    </data>
        <RelativeLayout
            android:id="@+id/rl_home_top"
            android:layout_width="match_parent"
            shape="@{1}"
            solid="@{@color/color_333333}"
            strokeColor="1"
            strokeWidth="@{@color/color_333333}"
            radius="@{3}"
            radiusLeftBottom="@{3}"
            radiusLeftTop="@{3}"
            radiusRightBottom="@{3}"
            radiusRightTop="@{3}"
            android:layout_height="70dp">
         </RelativeLayout>

</Layout>

StateListDrawable

/**
     *  需要press 状态的背景
     * @param view
     * @param unPressDrawable
     * @param pressDrawable
     */
    @BindingAdapter(value = {"unPressDrawableId","pressDrawableId"})
    public static void pressDrawable(View view,int unPressDrawable,int pressDrawable){
        view.setBackground(StateListDrawableFactory.createPressDrawable(unPressDrawable,pressDrawable));
    }
    /**
     *  需要press 状态的背景
     * @param view
     * @param unPressDrawable
     * @param pressDrawable
     */
    @BindingAdapter(value = {"unPressDrawable","pressDrawable"})
    public static void pressDrawable(View view, Drawable unPressDrawable, Drawable pressDrawable){
        view.setBackground(StateListDrawableFactory.createPressDrawable(unPressDrawable,pressDrawable));
    }

    /**
     *  类似checkbox 场景
     * @param view
     * @param unCheckDrawable
     * @param checkDrawable
     */
    @BindingAdapter(value = {"unCheckDrawableId","checkDrawableId"})
    public static void checkDrawable(View view,int unCheckDrawable,int checkDrawable){
        view.setBackground(StateListDrawableFactory.createPressDrawable(unCheckDrawable,checkDrawable));
    }

    /**
     *  类似checkbox 场景
     * @param view
     * @param unCheckDrawable
     * @param checkDrawable
     */
    @BindingAdapter(value = {"unCheckDrawable","checkDrawable"})
    public static void checkDrawable(View view,Drawable unCheckDrawable,Drawable checkDrawable){
        view.setBackground(StateListDrawableFactory.createPressDrawable(unCheckDrawable,checkDrawable));
    }

    /**
     * 背景选中状态
     * @param view
     * @param unSelectDrawable
     * @param selectDrawable
     */
    @BindingAdapter(value = {"unSelectDrawableId","selectDrawableId"})
    public static void selectDrawable(View view,int unSelectDrawable,int selectDrawable){
        view.setBackground(StateListDrawableFactory.createSelectDrawable(unSelectDrawable,selectDrawable));
    }
    /**
     * 背景选中状态
     * @param view
     * @param unSelectDrawable
     * @param selectDrawable
     */
    @BindingAdapter(value = {"unSelectDrawable","selectDrawable"})
    public static void selectDrawable(View view,Drawable unSelectDrawable,Drawable selectDrawable){
        view.setBackground(StateListDrawableFactory.createSelectDrawable(unSelectDrawable,selectDrawable));
    }

使用

               <Button
               checkDrawableId="@{@drawable/check}"
                unCheckDrawableId="@{@drawable/unCheck}"
                android:layout_marginLeft="27dp"
                android:layout_marginRight="27dp"/>

press 及 select 依上

也支持drawable直接

 <Button
               checkDrawable="@{GradientDrawableFactory.createDrawable(shape, solid, strokeWidth, strokeColor, floats)}"
                unCheckDrawable="@{GradientDrawableFactory.createDrawable(shape, solid, strokeWidth, strokeColor, floats)}"
                android:layout_marginLeft="27dp"
                android:layout_marginRight="27dp"/>

TextView 画线

下划线

    underLine="@{true}"

删除线

  deleteLine="@{true}"

网络图片加载

    imageUrl='@{"https://wwgsdfs"}'
    placeDrawableId="@{@drawable/...}"
    errorDrawableId="@{@drawable/...}"

注意在databinding 在"@{}"中写字符串时需要将外层的""改成''