Android 布局学习

 

ViewGroup	Width/Height , Padding/margin
FrameLayout	gravity
LinearLayout	Orientation/horizontal/vertical weight
RelativeLayout	alignBaseline/(Left/Top/Right/Bottom) Start/End alignParent center  Horizontal/Vertical/InParent below/above/toLeftOf/toRightOf/toStartOf/toEndOf

 

 

LinearLayout代码设置weight

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1.0f);
linearLayout.setLayoutParams(lp);

 

 

Android布局优化 （非常好的一篇文章）

http://www.infoq.com/cn/articles/android-optimise-layout

 

selector几种状态

state_pressed
state_focused
state_selected

 

 

TextView常用属性

android:ellipsize="none"
android:singleLine="true"
android:textColor=""
android:textSize=""

 

 

 

 

 

 

一、RelativeLayout布局属性 与 include、merge简单总结

 

// 当前视图顶部，底部，左侧，右侧与其他视图间填充区域

android:layout_marginTop
android:layout_marginBottom
android:layout_marginLeft
android:layout_marginRight

 

java代码设置

 

RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
// 单位是px
layoutParams.topMargin = 66;
layoutParams.bottomMargin = 66;
layoutParams.leftMargin = 66;
layoutParams.rightMargin = 66;

 

// 当前视图内顶部，底部，左侧，右侧填充区域 (非RelativeLayout属性)

android:paddingTop
android:paddingBottom
android:paddingLeft
android:paddingRight

 

 

// 在指定ID视图上面，下面，左侧，右侧

android:layout_above
android:layout_below
android:layout_toLeftOf
android:layout_toRightOf

Java代码设置

 

 

RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

layoutParams.addRule(RelativeLayout.ABOVE, R.id.viewId);
layoutParams.addRule(RelativeLayout.BELOW, R.id.viewId);
layoutParams.addRule(RelativeLayout.LEFT_OF, R.id.viewId);
layoutParams.addRule(RelativeLayout.RIGHT_OF, R.id.viewId);

 
// 与制定ID视图baseLine，顶部，底部，左侧，右侧边缘对齐

android:layout_alignBaseline
android:layout_alignTop
android:layout_alignBottom
android:layout_alignLeft
android:layout_alignRight

Java代码设置

 

 

RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

layoutParams.addRule(RelativeLayout.ALIGN_BASELINE, R.id.viewId);
layoutParams.addRule(RelativeLayout.ALIGN_TOP, R.id.viewId);
layoutParams.addRule(RelativeLayout.ALIGN_BOTTOM, R.id.viewId);
layoutParams.addRule(RelativeLayout.ALIGN_LEFT, R.id.viewId);
layoutParams.addRule(RelativeLayout.ALIGN_RIGHT, R.id.viewId);

// 与父视图顶部，底部，左侧，右侧边缘对齐

android:layout_alignParentTop
android:layout_alignParentBottom
android:layout_alignParentLeft
android:layout_alignParentRight

Java代码设置

 

 

RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

layoutParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);

// 横向居中，纵向居中，针对与父视图剧中

android:layout_centerHorizontal
android:layout_centerVertical
android:layout_centerInParent

 

 

Java代码设置

 

RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
layoutParams.addRule(RelativeLayout.CENTER_VERTICAL);
layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);

 

 

** Include 与 mege标签

参考资料：

Re-using Layouts with <include/>

Romain Guy   Android Layout Tricks #3: Optimize, Part 1

 

** ViewGroup相关配置

1. clipChildren

android:clipChildren setClipChildren(boolean)Defines whether a child is limited to draw inside of its bounds or not. 
定义是否限制子视图在它的范围内进行绘制。默认是true

2. clipToPadding
android:clipToPadding setClipToPadding(boolean)Defines whether the ViewGroup will clip its drawing surface so as to exclude the padding area. 
定义ViewGroup是否将剪切它的绘制界面并排除padding区域。默认是true

参考资料：

ViewGroup API

 

 

 

 

* 配置文件属性与Java代码方法对应

android:gravity
android:layout_gravity

android:layout_gravity="right"
lp.gravity = Gravity.RIGHT; 
button.setGravity(Gravity.CENTER); 

 

 

 

* View属性，子视图与父控件perssed 等状态保持一致
xml配置：

android:duplicateParentState

代码：

setDuplicateParentStateEnabled

* ViewGroup属性，父视图与子视图pressed状态保持一致

xml配置：

android:addStatesFromChildren

代码：

setAddStatesFromChildren

 

设置EditText光标位置

http://www.cnblogs.com/nanhuchongzi/archive/2012/04/17/2444451.html

 

 

** margin与padding的区别？

一个属于视图内，一个属于试图外

margin之后，如果视图隐藏，margin不会隐藏

因为margin是视图外的部分

padding会算如总宽吗？

会算入总宽

 

 

** 动态修改宽高
view.getLayoutParams().width = widthValue;

 

 

 

 

Android进阶练习-改善布局性能
http://blog.csdn.net/tu_bingbing/article/details/8654990

 

 

 

 

**TextView 显示两行，其余用....替换
android:maxLines="2"
android:ellipsize="end"


values/ids.xml
<resources>
  <item type="id" name="idname" />
</resources>
view.setId(R.id. idname);

 

*** 

布局XML Schema
有哪些属性，是在XML Schema定义，可以在http://www.w3school.com.cn/schema/schema_intro.asp了解Schema更多知识。
Android 布局XML Schema在什么地方？ 查询补漏

布局在Java中的对应关系 TypeArray

 

原文地址：http://blog.csdn.net/love_world_/article/details/8426935

 

 

2013-12-29  添加gravity、 layout_gravity、duplicateParentState

2014-04-10 添加布局XML Schema