简单说说 自己对 android LayoutParams的理解吧。...需要注意的是LayoutParams只是ViewGroup的一个内部类 这里边这个也就是ViewGroup里边这个LayoutParams类是 base class 基类 实际上每个不同的ViewGroup...都有自己的LayoutParams子类 比如LinearLayout 也有自己的 LayoutParams 大家打开源码看几眼就知道了 myeclipse 怎么查看源码 请看 http://...LinearLayout.LayoutParams p = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT...可以这样去形容LayoutParams,在象棋的棋盘上,每个棋子都占据一个位置,也就是每个棋子都有一个位置的信息,如这个棋子在4行4列,这里的“4行4列”就是棋子的LayoutParams。
LayoutParams是什么?...LayoutParams怎么用?...如果父控件是LinearLayout,需要使用LinearLayout.LayoutParams 代码如下: LinearLayout.LayoutParams layoutParams=(LinearLayout.LayoutParams...RelativeLayout.LayoutParams layoutParams=(RelativeLayout.LayoutParams)getLayoutParams(); layoutParams.leftMargin...View line = null; LayoutParams layoutParams = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 1
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简述: LayoutParams继承于Android.View.ViewGroup.LayoutParams相当于一个Layout的信息包,它封装了Layout的位置、高、宽等信息。...LayoutParams子类。...比如AbsListView.LayoutParams, AbsoluteLayout.LayoutParams, Gallery.LayoutParams, ViewGroup.MarginLayoutParams..., WindowManager.LayoutParams等。...一、LinearLayout.LayoutParams LinearLayout.LayoutParams的继承关系—>ViewGroup.MarginLayoutParams—>ViewGroup.LayoutParams
沙翁 向昨天要经验; 向今天要结果; 向明天要动力 Android开发:LayoutParams的用法 LayoutParams继承于Android.View.ViewGroup.LayoutParams...可以这样去形容LayoutParams,在象棋的棋盘上,每个棋子都占据一个位置,也就是每个棋子都有一个位置的信息,如这个棋子在4行4列,这里的“4行4列”就是棋子的LayoutParams。...在JAVA中动态构建的布局,常常这样写: setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT...很显然上面这句应该这样写才算准确: setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT,TableRow.LayoutParams.FILL_PARENT...RelativeLayout下动态设置子控件居中: RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT
大家好,又见面了,我是你们的朋友全栈君 LayoutParams是ViewGroup的一个内部类,声明方式如下 public static class LayoutParams { public...(int width, int height) { this.width = width; this.height = height; } public LayoutParams(LayoutParams...p)实现 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { return p; } 仅仅是返回了这个不合法的...instanceof LinearLayout.LayoutParams; } @Override protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams...new LayoutParams((LayoutParams) lp); } else if (lp instanceof MarginLayoutParams) { return new LayoutParams
FrameLayout的父控件是一个LinearLayout控件,问题出在,LinearLayout为子控件分配空间的时候,获取FrameLayout的LayoutParams的必须为LinearLayout.LayoutParams...,而非FrameLayout.LayoutParams。...如果要在代码里设置B的LayoutParams,B的LayoutParams要为RelativeLayout.LayoutParams。...RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT...); B.setLayoutParams(params); 而D要设置的话,需要: LinearLayout.LayoutParams params = new LinearLayout.LayoutParams
LayoutParams WindowManager.LayoutParams 是 WindowManager 接口的嵌套类;继承于 ViewGroup.LayoutParams 。
1.LayoutParams LayoutParams 是ViewGroup的内部静态类 ,ViewGroup的子类(如RelativeLayout,LinearLayout,FrameLayout...)都有其对应的 ViewGroup.LayoutParams的子类,如RelativeLayoutParams LayoutParams 的作用:指定视图View 的高度(height) 和...layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT.../** * 源码分析:getChildMeasureSpec() * 作用:根据父视图的MeasureSpec & 布局参数LayoutParams,计算单个子View的MeasureSpec...为MATCH_PARENT时(-1) } else if (childDimension == LayoutParams.MATCH_PARENT) { //子
这个时候就需要使用到RelativeLayout.LayoutParams.addRule()方法,该方法有两种重载方法: (1)、addRule(int verb) 该方法表示所设置节点的属性不能与其他兄弟节点相关或者属性值为布尔值...2、实例代码 RelativeLayout mainLayout = (RelativeLayout)findViewById(R.id.main_layout); RelativeLayout.LayoutParams...lpview = new RelativeLayout.LayoutParams (ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT
基础知识 LayoutParams是什么 LayoutParams翻译过来就是布局参数,子View通过LayoutParams告诉父容器(ViewGroup)应该如何放置自己。...事实上,每个ViewGroup的子类都有自己对应的LayoutParams类,典型的如LinearLayout.LayoutParams和FrameLayout.LayoutParams等,可以看出来LayoutParams...= height; } /** * 通过传入的LayoutParams构建新的LayoutParams */ public LayoutParams(LayoutParams...LayoutParams常见的子类 在为View设置LayoutParams的时候需要根据它的父容器选择对应的LayoutParams,否则结果可能与预期不一致,这里简单罗列一些常见的LayoutParams...RecyclerView.LayoutParams GridLayoutManager.LayoutParams StaggeredGridLayoutManager.LayoutParams ViewPager.LayoutParams
也就是说,不同类型的布局下的LayoutParams对象不能进行转换。而开发应验告诉我们,同一种布局下的LayoutParams才可以转换。...LayoutParams使用规则:“父Layout”为子控件分配空间的时候,获取”子Layout”的LayoutParams的必须是“父Layout”.LayoutParams,而非子Layout的LayoutParams...如果要在代码里设置B的LayoutParams,B的LayoutParams要为RelativeLayout.LayoutParams。...分析:“要在代码里设置B的LayoutParams”,就要用B的父Layout的LayoutParams,即RelativeLayout A得LayoutParams, 代码如下: RelativeLayout.LayoutParams...params = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT
android:layout_height="match_parent" /> java代码动态改变SurfaceView大小: ViewGroup.LayoutParams...layoutParams = mSurfaceView.getLayoutParams(); layoutParams.width = width; mSurfaceView.setLayoutParams...(layoutParams); 发现并没有用,但是在SurfaceView外层再嵌套一层FrameLayout就可以了,调整后布局如下: <?
一、前言 RelativeLayout.LayoutParams是一个RelativeLayout的布局参数 (1) 初始化 // 包裹内容 WRAP_CONTENT RelativeLayout.LayoutParams...layoutParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,RelativeLayout.LayoutParams.WRAP_CONTENT...); // 全部内容 MATCH_PARENT RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(...RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT); (2)参数 new RelativeLayout.LayoutParams...params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT
1、了解LayoutParams 其实LayoutParams就是代表一个布局属性,每一个ViewGroup对应一种LayoutParams。...LinearLayout对应LinearLayout.LayoutParams,RelativeLayout对应RelativeLayout.LayoutParams。...我们在XML中写的大多数属性,在代码中通过LayoutParams同样可以操作界面布局。...下面以RelativeLayout.LayoutParams为例: (1)RelativeLayout.LayoutParams.setMargins(left, top, right, bottom...,不能用new的形式去创建一个LayoutParams,即不能用这种方法: RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams
lp1 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT...lp2 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT...lp3 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT...lp = new RelativeLayout.LayoutParams( LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT); TextView...lp2 = new RelativeLayout.LayoutParams( LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT); lp2
public static class WindowManager.LayoutParams extends ViewGroup.LayoutParams implements Parcelable...android.view.ViewGroup.LayoutParams ?...android.view.WindowManager.LayoutParams WindowManager.LayoutParams 是 WindowManager 接口的嵌套类;它继承于 ViewGroup.LayoutParams...(WindowManager.LayoutParams.FLAG_FULLSCREEN); 或 window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN...在函数中,首先将用参数中传入的 WindowManager.LayoutParams的信息复制到本 WindowManager.LayoutParams 中,然后返回一个整数,以bite形式表示调用该函数后
参阅:http://android.xsoftlab.net/reference/android/widget/RelativeLayout.LayoutParams.html public static...class RelativeLayout.LayoutParams extends ViewGroup.MarginLayoutParams Added in API level 1 java.lang.Object...↳ android.view.ViewGroup.LayoutParams ↳ android.view.ViewGroup.MarginLayoutParams...↳ android.widget.RelativeLayout.LayoutParams 已知直接子类: PercentRelativeLayout.LayoutParams 【XML属性】...【继承自view.ViewGroup.LayoutParams的XML属性】 android:layout_height 属性说明:指定视图的基本高度。 这是包含布局管理器中任何视图的必需属性。
在源码里面: LayoutParams 是ViewGroup类里面的静态内部类, 同时MarginLayoutParams extends LayoutParams 也作为ViewGroup类里面的静态内部类...* {@hide} */ protected ViewGroup.LayoutParams mLayoutParams; 其次是get,这个大家都不陌生: /*...* * Get the LayoutParams associated with this view....* * @return The LayoutParams associated with this view, or null if no * parameters...public static void setWidthParams(View view,int dp){ LayoutParams lp=(LayoutParams)view.getLayoutParams
那么我们就需要使用到RelativeLayout.LayoutParams。...RelativeLayout.LayoutParams RelativeLayout.LayoutParams是一个RelativeLayout的布局参数,我们改变控件的就需要使用到。...初始化 // 包裹内容 RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT...,RelativeLayout.LayoutParams.WRAP_CONTENT); // 全部内容 RelativeLayout.LayoutParams layoutParams = new...RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT
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