blocks|key|3066663|text|这似乎是SDK中的错误。我已经在它上面提交了一个issue，你可能希望启动它，以便接收它的更新。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3066664|作为解决办法，您可以使用反射来访问该字段：|3066665|Class+clazz=Class.forName("android.R$styleable");
int+i=clazz.getField("Theme_backgroundDimAmount").getInt(clazz);|code-block|syntax|javascript|3066666|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/android/issues/detail?id=6236^0|O|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

This appears to be a bug in the SDK. I have filed an <a href="http://code.google.com/p/android/issues/detail?id=6236" rel="noreferrer">issue</a> on it, which you may wish to star so as to receive updates on it.

As a worksaround, you can use reflection to access the field:

<pre><code>Class clazz=Class.forName("android.R$styleable");
int i=clazz.getField("Theme_backgroundDimAmount").getInt(clazz);
</code></pre>

blocks|key|3066673|text|CustomView应用编程接口演示展示了如何检索样式化属性。视图的代码如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3066674|https://github.com/android/platform_development/blob/master/samples/ApiDemos/src/com/example/android/apis/view/LabelView.java|offset|length|3066675|用于检索文本、颜色和大小的可设置样式的数组在下面的<declare-styleable>部分中定义：|style|CODE|3066676|https://github.com/android/platform_development/blob/master/samples/ApiDemos/res/values/attrs.xml#L24|3066677|您可以使用<declare-styleable>定义要作为一个组检索的任何属性列表，其中既包含您自己的属性列表，也包含平台定义的属性列表。|3066678|就文档中的这些内容而言，围绕可样式化数组有大量的java文档，这使得它们在文档中很有用，所以它们被留在了文档中。但是，随着数组的变化，例如添加新的属性，常量的值可能会改变，因此平台常量不能在SDK中(请不要使用任何技巧来访问它们)。无论如何，应该不需要使用平台，因为它们每个都只是为了实现框架的一部分，并且像这里所示的那样创建自己的平台是很容易的。|3066679|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|3H|0|0|P|J|0|0|2T|1|0|5|J|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@$D|Z|E|10|1|11]]|A|$]]|$1|F|3|G|5|6|7|12|8|@$D|13|E|14|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@$D|16|E|17|1|18]]|A|$]]|$1|L|3|M|5|6|7|19|8|@$D|1A|E|1B|H|I]]|9|@]|A|$]]|$1|N|3|O|5|6|7|1C|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|C]]|W|$5|S|T|U|A|$V|K]]]]

The CustomView API demo shows how to retrieve styled attributes. The code for the view is here:

<a href="https://github.com/android/platform_development/blob/master/samples/ApiDemos/src/com/example/android/apis/view/LabelView.java" rel="nofollow noreferrer">https://github.com/android/platform_development/blob/master/samples/ApiDemos/src/com/example/android/apis/view/LabelView.java</a>

The styleable array used to retrieve the text, color, and size is defined in the <code>&lt;declare-styleable&gt;</code> section here:

<a href="https://github.com/android/platform_development/blob/master/samples/ApiDemos/res/values/attrs.xml#L24" rel="nofollow noreferrer">https://github.com/android/platform_development/blob/master/samples/ApiDemos/res/values/attrs.xml#L24</a>

You can use <code>&lt;declare-styleable&gt;</code> to define any list of attributes that you want to retrieve as a group, containing both your own and ones defined by the platform.

As far as these things being in the documentation, there is a lot of java doc around the styleable arrays that makes them useful to have in the documentation, so they have been left there. However as the arrays change, such as new attributes being added, the values of the constants can change, so the platform ones can not be in the SDK (and please do not use any tricks to try to access them). There should be no need to use the platform ones anyway, because they are each there just for the implementation of parts of the framework, and it is trivial to create your own as shown here.

blocks|key|3066690|text|在这个例子中，他们省略了对上下文‘c’的引用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3066691|public+ImageAdapter(Context+c)+{
++++TypedArray+a+=+c.obtainStyledAttributes(R.styleable.GalleryPrototype);
++++mGalleryItemBackground+=+a.getResourceId(
++++++++++++R.styleable.GalleryPrototype_android_galleryItemBackground,+0);
++++a.recycle();
++++return+mGalleryItemBackground;
}|code-block|syntax|javascript|3066692|将obtainStyledAttributes更改为c.obtainStyledAttributes应该可以|3066693|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In the example, they left out the reference to the Context 'c':

<pre><code>public ImageAdapter(Context c) {
 TypedArray a = c.obtainStyledAttributes(R.styleable.GalleryPrototype);
 mGalleryItemBackground = a.getResourceId(
 R.styleable.GalleryPrototype_android_galleryItemBackground, 0);
 a.recycle();
 return mGalleryItemBackground;
}
</code></pre>

Changing obtainStyledAttributes to c.obtainStyledAttributes should work

blocks|key|318886|text|在自定义视图中提取标准属性(背景)的示例，该视图具有自己的默认样式。在此示例中，PasswordGrid的自定义视图扩展了GridLayout。我为使用标准的android属性android:background.设置背景图像的PasswordGrid指定了一个样式|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|318887|public+class+PasswordGrid+extends+GridLayout+{

++++public+PasswordGrid(Context+context)+{
++++++++super(context);
++++++++init(context,+null,+0);
++++}

++++public+PasswordGrid(Context+context,+AttributeSet+attrs)+{
++++++++super(context,+attrs,+R.attr.passwordGridStyle);
++++++++init(context,+attrs,+0);
++++}

++++public+PasswordGrid(Context+context,+AttributeSet+attrs,+int+defStyle)+{
++++++++super(context,+attrs,+defStyle);
++++++++init(context,+attrs,+defStyle);
++++}

++++private+void+init(Context+context,+AttributeSet+attrs,+int+defStyle)+{
++++++++if+(!isInEditMode())+{

++++++++++++TypedArray+stdAttrs+=+context.obtainStyledAttributes(attrs,
++++++++++++++++++++new+int[]+{+android.R.attr.background+},++//+attribute[s]+to+access
++++++++++++++++++++defStyle,+
++++++++++++++++++++R.style.PasswordGridStyle);++//+Style+to+access

+++++++++++//+or+use+any+style+available+in+the+android.R.style+file,+such+as
+++++++++++//+++++++android.R.style.Theme_Holo_Light

++++++++++++if+(stdAttrs+!=+null)+{
++++++++++++++++Drawable+bgDrawable+=+stdAttrs.getDrawable(0);
++++++++++++++++if+(bgDrawable+!=+null)
++++++++++++++++++++this.setBackground(bgDrawable);
++++++++++++++++stdAttrs.recycle();
++++++++++++}
++++++++}
++++}|code-block|syntax|javascript|318888|以下是我的styles.xml文件的一部分：|318889|+<declare-styleable+name="passwordGrid">
++++<attr+name="drawOn"+format="color%7Creference"+/>
++++<attr+name="drawOff"+format="color%7Creference"+/>
++++<attr+name="pathWidth"+format="integer"+/>
++++<attr+name="pathAlpha"+format="integer"+/>
++++<attr+name="pathColor"+format="color"+/>
+</declare-styleable>



++<style+name="PasswordGridStyle"+parent="@android:style/Widget.GridView"+>++
++++++
++++++<item+name="drawOff">@drawable/ic_more</item>
++++++<item+name="drawOn">@drawable/ic_menu_cut</item>
++++++<item+name="pathWidth">31</item>
++++++<item+name="pathAlpha">129</item>
++++++<item+name="pathColor">@color/green</item>

++++++
++++++<item+name="android:background">@drawable/pattern_bg</item>
</style>|318890|entityMap^0|14|C|1P|A|2G|I|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

Example of pulling out standard attribute (background) in a custom view which has its own default style. In this example the custom view PasswordGrid extends GridLayout. I specified a style for PasswordGrid which sets a background image using the standard android attribute android:background.

<pre><code>public class PasswordGrid extends GridLayout {

 public PasswordGrid(Context context) {
 super(context);
 init(context, null, 0);
 }

 public PasswordGrid(Context context, AttributeSet attrs) {
 super(context, attrs, R.attr.passwordGridStyle);
 init(context, attrs, 0);
 }

 public PasswordGrid(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 init(context, attrs, defStyle);
 }

 private void init(Context context, AttributeSet attrs, int defStyle) {
 if (!isInEditMode()) {

 TypedArray stdAttrs = context.obtainStyledAttributes(attrs,
 new int[] { android.R.attr.background }, // attribute[s] to access
 defStyle, 
 R.style.PasswordGridStyle); // Style to access

 // or use any style available in the android.R.style file, such as
 // android.R.style.Theme_Holo_Light

 if (stdAttrs != null) {
 Drawable bgDrawable = stdAttrs.getDrawable(0);
 if (bgDrawable != null)
 this.setBackground(bgDrawable);
 stdAttrs.recycle();
 }
 }
 }
</code></pre>

Here is part of my styles.xml file:

<pre><code> &lt;declare-styleable name="passwordGrid"&gt;
 &lt;attr name="drawOn" format="color|reference" /&gt;
 &lt;attr name="drawOff" format="color|reference" /&gt;
 &lt;attr name="pathWidth" format="integer" /&gt;
 &lt;attr name="pathAlpha" format="integer" /&gt;
 &lt;attr name="pathColor" format="color" /&gt;
 &lt;/declare-styleable&gt;



 &lt;style name="PasswordGridStyle" parent="@android:style/Widget.GridView" &gt; 
 &lt;!-- Style custom attributes. --&gt;
 &lt;item name="drawOff"&gt;@drawable/ic_more&lt;/item&gt;
 &lt;item name="drawOn"&gt;@drawable/ic_menu_cut&lt;/item&gt;
 &lt;item name="pathWidth"&gt;31&lt;/item&gt;
 &lt;item name="pathAlpha"&gt;129&lt;/item&gt;
 &lt;item name="pathColor"&gt;@color/green&lt;/item&gt;

 &lt;!-- Style standard attributes --&gt;
 &lt;item name="android:background"&gt;@drawable/pattern_bg&lt;/item&gt;
&lt;/style&gt;
</code></pre>

So I have looked around and found out that <code>android.R.styleable</code> is no longer part of the SDK even though it is still documented <a href="http://developer.android.com/reference/android/R.styleable.html" rel="nofollow noreferrer">here</a>.

That wouldn't really be an issue if it was clearly documented what the alternative is. For example the AOSP Calendar App is still using the <code>android.R.styleable</code>

<pre><code>// Get the dim amount from the theme 
TypedArray a = obtainStyledAttributes(com.android.internal.R.styleable.Theme);
lp.dimAmount = a.getFloat(android.R.styleable.Theme_backgroundDimAmount, 0.5f);
a.recycle();
</code></pre>

So how would one get the <code>backgroundDimAmount</code> without getting the <code>int[]</code> from <code>android.R.styleable.Theme</code>?

What do I have to stick into <code>obtainStyledAttributes(int [])</code> in order to make it work with the SDK?

How do I use obtainStyledAttributes(int []) with internal Themes of Android

所以我环顾四周，发现android.R.styleable不再是SDK的一部分，尽管它仍然是文档中的。如果清楚地记录了替代方案是什么，那就不是问题了。例如，AOSP Calendar App仍在使用android.R.styleable// Get the dim amount from the theme   Typ...

问如何使用带有Android内部主题的obtainStyledAttributes(int [])
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何使用带有Android内部主题的obtainStyledAttributes(int [])EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何使用带有Android内部主题的obtainStyledAttributes(int [])
EN