？机器人：ATTR / selectableItemBackground与另一个现有背景 [英] ?android:attr/selectableItemBackground with another existing background

问题描述

我有一个9patch设置为我的布局的背景。不过，我还是想要通过使用 selectableItemBackground ATTR提供触摸反馈。

我用尝试了＆LT;层列表＆gt; 与9patch和 selectableItemBackground 为机器人：可绘制的第二＆LT;项目＆GT; ，但没有奏效。

我也可以尝试做一个选择和覆盖梯度绘制机器人在 list_selector_background_ pressed.xml selectableItemBackground $ C>与＆LT;层列表＆gt; 。但在4.4奇巧选择背景色实际上是灰色的，而不是蓝牌的软糖，让我可以在c它不是真的很难$ C $：（

必须有一个更简单的方法，正确的人？ D：

解决方案

  

我试着使用与9patch已经和   selectableItemBackground由于Android：第二次的绘制，   然而，没有工作。

是的，在一层列表绘制属性（或国家列表）不接受 ATTR 值。你会看到一个 Resource.NotFoundException 。一看LayerDrawable（或StateListDrawable的）源$ C ​​$ C解释了原因：您提供的价值被假定为一个绘制的ID。

不过，您可以检索主题，特定于平台的可绘制在code的属性：

  //属性阵列
INT [] ATTRS =新INT [] {android.R.attr.selectableItemBackground};

TypedArray A = getTheme（）obtainStyledAttributes（ATTRS）。

//绘制对象按属性举办selectableItemBackground'是索引'0'
绘制对象D = a.getDrawable（0）;

a.recycle（）;
 

现在，您可以创建一个 LayerDrawable ：

  LayerDrawable LD =新LayerDrawable（新绘制对象[] {

                       //九路径绘制对象
                       getResources（）。getDrawable（R.drawable.Your_Nine_Path）

                       //从属性绘制对象
                       D}）;

//将背景设置为LD
yourLayoutContainer.setBackground（LD）;
 

您还将需要设置 yourLayoutContainer的可点击属性：

 机器人：可点击=真
 

I have a 9patch set as the background of my layout. However I still want to provide touch feedback by using the selectableItemBackground attr.

I've tried using a <layer-list> with the 9patch and selectableItemBackground as the android:drawable of the second <item>, however that did not work.

I could also try making a selector and overlay the gradient drawable android uses for selectableItemBackground in list_selector_background_pressed.xml with a <layer-list>. But in 4.4 KitKat the selected background color is actually gray instead of blue in JellyBeans, so I can't really hardcode it :(

There has to be an easier way, right guys? D:

解决方案

I've tried using a with the 9patch and selectableItemBackground as the android:drawable of the second , however that did not work.

Yes, drawable attribute in a layer-list (or state-list) does not accept an attr value. You would see a Resource.NotFoundException. A look at LayerDrawable's (or StateListDrawable's) source code explains why: the value that you provide is assumed to be a drawable's id.

But, you can retrieve a theme and platform-specific drawable for an attribute in code:

// Attribute array
int[] attrs = new int[] { android.R.attr.selectableItemBackground };

TypedArray a = getTheme().obtainStyledAttributes(attrs);

// Drawable held by attribute 'selectableItemBackground' is at index '0'        
Drawable d = a.getDrawable(0);

a.recycle();

Now, you can create a LayerDrawable:

LayerDrawable ld = new LayerDrawable(new Drawable[] {

                       // Nine Path Drawable
                       getResources().getDrawable(R.drawable.Your_Nine_Path), 

                       // Drawable from attribute  
                       d });

// Set the background to 'ld'
yourLayoutContainer.setBackground(ld);

You'll also need to set yourLayoutContainer's clickable attribute:

android:clickable="true"

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