问题描述
我试图以编程方式将StateListDrawable设置为我的图书馆项目自定义视图的背景.这是我在做什么:
I'm trying to programatically set a StateListDrawable as the background of my custom view for a library project. Here's what I'm doing:
final TypedArray a = getContext().obtainStyledAttributes(attrs,
R.styleable.ActionBar);
int firstColor = a.getColor(
R.styleable.ActionBar_backgroundGradientFirstColor, 0xff000000);
int secondColor = a
.getColor(R.styleable.ActionBar_backgroundGradientSecondColor,
0xff000000);
int textViewColor = a.getColor(R.styleable.ActionBar_titleColor,
0xffffffff);
int onClickColor = a.getColor(
R.styleable.ActionBar_backgroundClickedColor, 0xff999999);
a.recycle();
StateListDrawable sld = new StateListDrawable();
GradientDrawable drawable = new GradientDrawable(
Orientation.TOP_BOTTOM, new int[] { firstColor, secondColor });
sld.addState(new int[] { android.R.attr.state_enabled },
new ColorDrawable(onClickColor));
sld.addState(new int[] { android.R.attr.state_pressed }, drawable);
action2.setBackgroundDrawable(sld);
action3.setBackgroundDrawable(sld);
actionBack.setBackgroundDrawable(sld);
pb.setBackgroundDrawable(drawable);
tv.setBackgroundDrawable(drawable);
tv.setTextColor(textViewColor);
但是，这不起作用:它始终绘制 enabled 状态.当我按下按钮时，我希望它绘制 Pressed 状态.我在做什么错了?
However, this is not working: It always draws the enabled state. I want it to draw the Pressed state when I press the button. What am I doing wrong?
推荐答案
我猜按钮被按下后仍处于启用状态?
I guess the button is still enabled while it's pressed?
您可以尝试反转顺序:
sld.addState(new int[] { android.R.attr.state_pressed }, drawable);
sld.addState(new int[] { android.R.attr.state_enabled },
new ColorDrawable(onClickColor));
可能正在绘制第一个当前有效状态.
Probably the first currently valid state is being drawn.
如果要在按下背景时使用不同的背景，而在其他所有情况下也要使用其他背景，则可以使用:
If you want a different background when it's being pressed and another background for all other cases you can also use:
sld.addState(new int[] { android.R.attr.state_pressed }, drawable);
sld.addState(new int[] { StateSet.WILD_CARD },
new ColorDrawable(onClickColor));
添加:我刚刚对此进行了测试，下面的测试代码对我有用:
Addition: I just tested this and the following test code works for me:
Button testButton = new Button(context);
testButton.setText("Test");
StateListDrawable sld = new StateListDrawable();
GradientDrawable drawable = new GradientDrawable(
Orientation.TOP_BOTTOM, new int[] { Color.BLUE, Color.RED });
sld.addState(new int[] { android.R.attr.state_pressed }, drawable);
sld.addState(StateSet.WILD_CARD, new ColorDrawable(Color.YELLOW));
testButton.setBackgroundDrawable(sld);
mainLayout.addView(testButton);
这篇关于StateListDrawable不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！