Android的按键采用与不同的图像文本启用和pressed [英] Android Button with Text with different images for Enabled and Pressed

问题描述

我想创建具有状态按钮文本和图片上通过以下$ C顶部$ C：

I am trying to create a stateful Button having Text and an Image on the top via the following code:

<Button
android:id="@+id/btnMultiplayer"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:drawableTop="@drawable/multiplayer"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:text="Multiplayer"/>

要得到这样的：

不过，我找不到改变绘在上面当图像pssed $ P $的方式。

However, I couldn't find the way to change the drawable on the top when the image is pressed.

我试图设置的android：drawableTop 到 @绘制/ multiplayer_stateful ，其中 @drawable / multiplayer_stateful 是：

I tried to set android:drawableTop to @drawable/multiplayer_stateful where @drawable/multiplayer_stateful is :

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

<item android:drawableTop="@drawable/multiplayer" android:state_enabled="true" android:state_window_focused="false"/>
<item android:drawableTop="@drawable/multiplayer_pressed" android:state_pressed="true"/>

</selector>

但是，这并不正常工作。 （请注意，@绘制/多人和@绘制/ multiplayer_ pressed是PNG文件）

but this doesn't work. (Note that @drawable/multiplayer and @drawable/multiplayer_pressed are png files)

有什么建议？

推荐答案

您必须使用的android：抖动=真正的

试试这个。

<?xml version="1.0" encoding="utf-8"?>
<selector 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:dither="true" >

<item android:drawableTop="@drawable/multiplayer" android:state_enabled="true" android:state_window_focused="false"/>
<item android:drawableTop="@drawable/multiplayer_pressed" android:state_pressed="true"/>

</selector>

从Android电子文档：

From Android Docs:

启用或禁用抖动位图如果位图不
  具有相同的像素结构的屏幕（例如：一个ARGB
  8888位与RGB 565屏幕）。

Enables or disables dithering of the bitmap if the bitmap does not have the same pixel configuration as the screen (for instance: a ARGB 8888 bitmap with an RGB 565 screen).

必须是一个布尔值，无论是真或假。

Must be a boolean value, either "true" or "false".

这也可能是一个资源的引用（形式
  @ [包：]类型：名称）或主题属性（形式
  [包：] [类型：]名。包含此类型的值）

This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type.

抖动影响颜色​​是更高precision比设备如何降采样。无抖动一般更快，但高于precision颜色只是截断下来（例如8888 - > 565）。抖动尝试分配固有的误差在此过程中，以减少视觉伪影

Dithering affects how colors that are higher precision than the device are down-sampled. No dithering is generally faster, but higher precision colors are just truncated down (e.g. 8888 -> 565). Dithering tries to distribute the error inherent in this process, to reduce the visual artifacts.

我希望它能帮助！

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