include及merge在androidmanifest.xml中的作用(include eigen)

推荐整理分享include及merge在androidmanifest.xml中的作用(include eigen)，希望有所帮助，仅作参考，欢迎阅读内容。

文章相关热门搜索词:include sphere,include merge和viewstub,include and,include merge,include eigen,include eigen,include merge和viewstub,include merge和viewstub,内容如对您有帮助，希望把文章链接给更多的朋友！

Although Android offers a variety of widgets to provide small and re-usable interactive elements, you might also need to re-use larger components that require a special layout. To efficiently re-use complete layouts, you can use the<include/> and <merge/> tags to embed another layout inside the current layout.

Reusing layouts is particularly powerful as it allows you create reusable complex layouts. For example, a yes/no button panel, or custom progress bar with description text. It also means that any elements of your application that are common across multiple layouts can be extracted, managed separately, then included in each layout. So while you can create individual UI components by writing a customView, you can do it even more easily by re-using a layout file.

If you already know the layout that you want to re-use, create a new XML file and define the layout. For example, here's a layout from the G-Kenya codelab that defines a title bar to be included in each activity (titlebar.xml):

The root View should be exactly how you'd like it to appear in each layout to which you add this layout.

Inside the layout to which you want to add the re-usable component, add the <include/> tag. For example, here's a layout from the G-Kenya codelab that includes the title bar from above:

Here's the layout file:

You can also override all the layout parameters (any android:layout_* attributes) of the included layout's root view by specifying them in the<include/> tag. For example:

However, if you want to override layout attributes using the <include> tag, you must override bothandroid:layout_height and android:layout_width in order for other layout attributes to take effect.

The <merge /> tag helps eliminate redundant view groups in your view hierarchy when including one layout within another. For example, if your main layout is a verticalLinearLayout in which two consecutive views can be re-used in multiple layouts, then the re-usable layout in which you place the two views requires its own root view. However, using another LinearLayout as the root for the re-usable layout would result in a verticalLinearLayout inside a verticalLinearLayout. The nestedLinearLayout serves no real purpose other than to slow down your UI performance.

To avoid including such a redundant view group, you can instead use the <merge> element as the root view for the re-usable layout. For example:

Now, when you include this layout in another layout (using the <include/> tag), the system ignores the<merge> element and places the two buttons directly in the layout, in place of the<include/> tag.

ViewPager内使用FragmentPagerAdapter时滑动出现illegalstateexception解决办法 ViewPager内使用FragmentPagerAdapter时滑动出现java.lang.IllegalStateException:Thespecifiedchildalreadyhasaparent.YoumustcallremoveView()onthechild'sparentfirst，解决办法：viewpager.setOff

Android按返回键（后退键）Back键事件捕获的两种方法 packagezhangphil.back;importandroid.support.v7.app.ActionBarActivity;importandroid.util.Log;importandroid.view.KeyEvent;importandroid.os.Bundle;publicclassMainActivityextendsActionBarActivity{//打印

Android 自定义日期控件 (仿QQ,IOS7) 还记得上篇：Android日期时间选择器，本篇是根据上篇修改而来，先看下qq中日期选择的效果：鉴于目前还没有相的开源日期控件，因此本人花费了一些