android以编程方式添加ImageView选择器

Question

我想以编程方式使用选择器状态而不是使用 xml 文件来更改 ImageView 背景(在我的例子中是渐变颜色)。

我希望我的 ImageView 处于按下状态和默认状态

为了创建渐变背景，我使用了这段代码:

 GradientDrawable gd = new GradientDrawable(
                    GradientDrawable.Orientation.BOTTOM_TOP,
                    new int[] {Color.parseColor(startColour), Color.parseColor(endColour)});

如何为此实现选择器？

谢谢

Answer 1

这是来 self 的应用:

public static Drawable getButtonDrawableByScreenCathegory(Context con,
        ScreenCategory screenCategory, ButtonType buttonType) {

    int normalStateResID = (int) GXConstants.NOT_ID;
    int pressedStateResID = R.drawable.button_header_pressed;

    switch (screenCategory) {
    ...
    }

    Drawable state_normal = con.getResources()
            .getDrawable(normalStateResID).mutate();

    Drawable state_pressed = con.getResources()
            .getDrawable(pressedStateResID).mutate();

    StateListDrawable drawable = new StateListDrawable();

    drawable.addState(new int[] { android.R.attr.state_pressed },
            state_pressed);
    drawable.addState(new int[] { android.R.attr.state_enabled },
            state_normal);

    return drawable;
}

要为我调用的按钮设置背景:

button.setBackgroundDrawable(GXUtils.getButtonDrawableByScreenCathegory(
            this, mScreenCategory, ButtonType.MENU)