Android 百分比布局库(percent-support-lib) 解析与扩展

转载请标明出处:

http://blog.csdn.net/lmj623565791/article/details/46695347

本文出自:【张鸿洋的博客】


一、概述

周末游戏打得过猛,于是周天熬夜码代码,周一早上浑浑噩噩的发现android-percent-support-lib-sample这个项目,Google终于开始支持百分比的方式布局了,瞬间脉动回来,啊咧咧。对于这种历史性的时刻,不出篇博客难以表达我内心的激动。

还记得不久前,发了篇博客:Android 屏幕适配方案,这篇博客以Web页面设计引出一种适配方案,最终的目的就是可以通过百分比控制控件的大小。当然了,存在一些问题,比如:

  • 对于没有考虑到屏幕尺寸,可能会出现意外的情况;
  • apk的大小会增加;

当然了android-percent-support这个库,基本可以解决上述问题,是不是有点小激动,稍等,我们先描述下这个support-lib。

这个库提供了:

  • 两种布局供大家使用:

    PercentRelativeLayoutPercentFrameLayout,通过名字就可以看出,这是继承自FrameLayoutRelativeLayout两个容器类;

  • 支持的属性有:

layout_widthPercentlayout_heightPercent

layout_marginPercentlayout_marginLeftPercent

layout_marginTopPercentlayout_marginRightPercent

layout_marginBottomPercentlayout_marginStartPercentlayout_marginEndPercent

可以看到支持宽高,以及margin。

也就是说,大家只要在开发过程中使用PercentRelativeLayoutPercentFrameLayout替换FrameLayoutRelativeLayout即可。

是不是很简单,不过貌似没有LinearLayout,有人会说LinearLayout有weight属性呀。但是,weight属性只能支持一个方向呀~~哈,没事,刚好给我们一个机会去自定义一个PercentLinearLayout

好了,本文分为3个部分:

  • PercentRelativeLayoutPercentFrameLayout的使用
  • 对上述控件源码分析
  • 自定义PercentLinearLayout

二、使用

关于使用,其实及其简单,并且github上也有例子,android-percent-support-lib-sample。我们就简单过一下:

首先记得在build.gradle添加:

 compile 'com.android.support:percent:22.2.0'

(一)PercentFrameLayout

<?xml version="1.0" encoding="utf-8"?>
<android.support.percent.PercentFrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"> <TextView
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_gravity="left|top"
android:background="#44ff0000"
android:text="width:30%,height:20%"
app:layout_heightPercent="20%"
android:gravity="center"
app:layout_widthPercent="30%"/> <TextView
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_gravity="right|top"
android:gravity="center"
android:background="#4400ff00"
android:text="width:70%,height:20%"
app:layout_heightPercent="20%"
app:layout_widthPercent="70%"/> <TextView
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_gravity="bottom"
android:background="#770000ff"
android:text="width:100%,height:10%"
android:gravity="center"
app:layout_heightPercent="10%"
app:layout_widthPercent="100%"/> </android.support.percent.PercentFrameLayout>

3个TextView,很简单,直接看效果图:

Android 百分比布局库(percent-support-lib) 解析与扩展


(二) PercentRelativeLayout

<?xml version="1.0" encoding="utf-8"?>
<android.support.percent.PercentRelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"> <TextView
android:id="@+id/row_one_item_one"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_alignParentTop="true"
android:background="#7700ff00"
android:text="w:70%,h:20%"
android:gravity="center"
app:layout_heightPercent="20%"
app:layout_widthPercent="70%"/> <TextView
android:id="@+id/row_one_item_two"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_toRightOf="@+id/row_one_item_one"
android:background="#396190"
android:text="w:30%,h:20%"
app:layout_heightPercent="20%"
android:gravity="center"
app:layout_widthPercent="30%"/> <ImageView
android:id="@+id/row_two_item_one"
android:layout_width="match_parent"
android:layout_height="0dp"
android:src="@drawable/tangyan"
android:scaleType="centerCrop"
android:layout_below="@+id/row_one_item_one"
android:background="#d89695"
app:layout_heightPercent="70%"/> <TextView
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_below="@id/row_two_item_one"
android:background="#770000ff"
android:gravity="center"
android:text="width:100%,height:10%"
app:layout_heightPercent="10%"
app:layout_widthPercent="100%"/> </android.support.percent.PercentRelativeLayout>

ok,依然是直接看效果图:

Android 百分比布局库(percent-support-lib) 解析与扩展

使用没什么好说的,就是直观的看一下。


三、源码分析

其实细想一下,Google只是对我们原本熟悉的RelativeLayout和FrameLayout进行的功能的扩展,使其支持了percent相关的属性。

那么,我们考虑下,如果是我们添加这种扩展,我们会怎么做:

  • 通过LayoutParams获取child设置的percent相关属性的值
  • onMeasure的时候,将child的width,height的值,通过获取的自定义属性的值进行计算(eg:容器的宽 * fraction ),计算后传入给child.measure(w,h);

ok,有了上面的猜想,我们直接看PercentFrameLayout的源码。

public class PercentFrameLayout extends FrameLayout {
private final PercentLayoutHelper mHelper = new PercentLayoutHelper(this); //省略了,两个构造方法 public PercentFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
} @Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(getContext(), attrs);
} @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
mHelper.adjustChildren(widthMeasureSpec, heightMeasureSpec);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mHelper.handleMeasuredStateTooSmall()) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
} @Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
mHelper.restoreOriginalParams();
} public static class LayoutParams extends FrameLayout.LayoutParams
implements PercentLayoutHelper.PercentLayoutParams {
private PercentLayoutHelper.PercentLayoutInfo mPercentLayoutInfo; public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
mPercentLayoutInfo = PercentLayoutHelper.getPercentLayoutInfo(c, attrs);
}
//省略了一些代码... @Override
public PercentLayoutHelper.PercentLayoutInfo getPercentLayoutInfo() {
return mPercentLayoutInfo;
} @Override
protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) {
PercentLayoutHelper.fetchWidthAndHeight(this, a, widthAttr, heightAttr);
}
}
}

代码是相当的短,可以看到PercentFrameLayout里面首先重写了generateLayoutParams方法,当然了,由于支持了一些新的layout_属性,那么肯定需要定义对应的LayoutParams。


(一)percent相关属性的获取

可以看到PercentFrameLayout.LayoutParams在原有的FrameLayout.LayoutParams基础上,实现了PercentLayoutHelper.PercentLayoutParams接口。

这个接口很简单,只有一个方法:

public interface PercentLayoutParams {
PercentLayoutInfo getPercentLayoutInfo();
}

而,这个方法的实现呢,也只有一行:return mPercentLayoutInfo;,那么这个mPercentLayoutInfo在哪完成赋值呢?

看PercentFrameLayout.LayoutParams的构造方法:

public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
mPercentLayoutInfo = PercentLayoutHelper.getPercentLayoutInfo(c, attrs);
}

可以看到,将attrs传入给getPercentLayoutInfo方法,那么不用说,这个方法的内部,肯定是获取自定义属性的值,然后将其封装到PercentLayoutInfo对象中,最后返回。

代码如下:

public static PercentLayoutInfo getPercentLayoutInfo(Context context,
AttributeSet attrs) {
PercentLayoutInfo info = null;
TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.PercentLayout_Layout);
float value = array.getFraction(R.styleable.PercentLayout_Layout_layout_widthPercent, 1, 1,
-1f);
if (value != -1f) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "percent width: " + value);
}
info = info != null ? info : new PercentLayoutInfo();
info.widthPercent = value;
}
value = array.getFraction(R.styleable.PercentLayout_Layout_layout_heightPercent, 1, 1, -1f);
if (value != -1f) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "percent height: " + value);
}
info = info != null ? info : new PercentLayoutInfo();
info.heightPercent = value;
}
value = array.getFraction(R.styleable.PercentLayout_Layout_layout_marginPercent, 1, 1, -1f);
if (value != -1f) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "percent margin: " + value);
}
info = info != null ? info : new PercentLayoutInfo();
info.leftMarginPercent = value;
info.topMarginPercent = value;
info.rightMarginPercent = value;
info.bottomMarginPercent = value;
}
value = array.getFraction(R.styleable.PercentLayout_Layout_layout_marginLeftPercent, 1, 1,
-1f);
if (value != -1f) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "percent left margin: " + value);
}
info = info != null ? info : new PercentLayoutInfo();
info.leftMarginPercent = value;
}
value = array.getFraction(R.styleable.PercentLayout_Layout_layout_marginTopPercent, 1, 1,
-1f);
if (value != -1f) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "percent top margin: " + value);
}
info = info != null ? info : new PercentLayoutInfo();
info.topMarginPercent = value;
}
value = array.getFraction(R.styleable.PercentLayout_Layout_layout_marginRightPercent, 1, 1,
-1f);
if (value != -1f) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "percent right margin: " + value);
}
info = info != null ? info : new PercentLayoutInfo();
info.rightMarginPercent = value;
}
value = array.getFraction(R.styleable.PercentLayout_Layout_layout_marginBottomPercent, 1, 1,
-1f);
if (value != -1f) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "percent bottom margin: " + value);
}
info = info != null ? info : new PercentLayoutInfo();
info.bottomMarginPercent = value;
}
value = array.getFraction(R.styleable.PercentLayout_Layout_layout_marginStartPercent, 1, 1,
-1f);
if (value != -1f) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "percent start margin: " + value);
}
info = info != null ? info : new PercentLayoutInfo();
info.startMarginPercent = value;
}
value = array.getFraction(R.styleable.PercentLayout_Layout_layout_marginEndPercent, 1, 1,
-1f);
if (value != -1f) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "percent end margin: " + value);
}
info = info != null ? info : new PercentLayoutInfo();
info.endMarginPercent = value;
}
array.recycle();
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "constructed: " + info);
}
return info;
}

是不是和我们平时的取值很类似,所有的值最终封装到PercentLayoutInfo对象中。

ok,到此我们的属性获取就介绍完成,有了这些属性,是不是onMeasure里面要进行使用呢?


(二) onMeasue中重新计算child的尺寸

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
mHelper.adjustChildren(widthMeasureSpec, heightMeasureSpec);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mHelper.handleMeasuredStateTooSmall()) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}

可以看到onMeasure中的代码页很少,看来核心的代码都被封装在mHelper的方法中,我们直接看mHelper.adjustChildren方法。

/**
* Iterates over children and changes their width and height to one calculated from percentage
* values.
* @param widthMeasureSpec Width MeasureSpec of the parent ViewGroup.
* @param heightMeasureSpec Height MeasureSpec of the parent ViewGroup.
*/
public void adjustChildren(int widthMeasureSpec, int heightMeasureSpec) {
//...
int widthHint = View.MeasureSpec.getSize(widthMeasureSpec);
int heightHint = View.MeasureSpec.getSize(heightMeasureSpec);
for (int i = 0, N = mHost.getChildCount(); i < N; i++) {
View view = mHost.getChildAt(i);
ViewGroup.LayoutParams params = view.getLayoutParams(); if (params instanceof PercentLayoutParams) {
PercentLayoutInfo info =
((PercentLayoutParams) params).getPercentLayoutInfo();
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "using " + info);
}
if (info != null) {
if (params instanceof ViewGroup.MarginLayoutParams) {
info.fillMarginLayoutParams((ViewGroup.MarginLayoutParams) params,
widthHint, heightHint);
} else {
info.fillLayoutParams(params, widthHint, heightHint);
}
}
}
}
}

通过注释也能看出,此方法中遍历所有的孩子,通过百分比的属性重新设置其宽度和高度。

首先在widthHint、heightHint保存容器的宽、高,然后遍历所有的孩子,判断其LayoutParams是否是PercentLayoutParams类型,如果是,通过params.getPercentLayoutInfo拿出info对象。

是否还记得,上面的分析中,PercentLayoutInfo保存了percent相关属性的值。

如果info不为null,则判断是否需要处理margin;我们直接看fillLayoutParams方法(处理margin也是类似的)。

 /**
* Fills {@code ViewGroup.LayoutParams} dimensions based on percentage values.
*/
public void fillLayoutParams(ViewGroup.LayoutParams params, int widthHint,
int heightHint) {
// Preserve the original layout params, so we can restore them after the measure step.
mPreservedParams.width = params.width;
mPreservedParams.height = params.height; if (widthPercent >= 0) {
params.width = (int) (widthHint * widthPercent);
}
if (heightPercent >= 0) {
params.height = (int) (heightHint * heightPercent);
}
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "after fillLayoutParams: (" + params.width + ", " + params.height + ")");
}
}

首先保存原本的width和height,然后重置params的width和height为(int) (widthHint * widthPercent)(int) (heightHint * heightPercent);

到此,其实我们的百分比转换就结束了,理论上就已经实现了对于百分比的支持,不过Google还考虑了一些细节。

我们回到onMeasure方法:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
mHelper.adjustChildren(widthMeasureSpec, heightMeasureSpec);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mHelper.handleMeasuredStateTooSmall()) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}

下面还有个mHelper.handleMeasuredStateTooSmall的判断,也就是说,如果你设置的百分比,最终计算出来的MeasuredSize过小的话,会进行一些操作。

代码如下:

public boolean handleMeasuredStateTooSmall() {
boolean needsSecondMeasure = false;
for (int i = 0, N = mHost.getChildCount(); i < N; i++) {
View view = mHost.getChildAt(i);
ViewGroup.LayoutParams params = view.getLayoutParams();
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "should handle measured state too small " + view + " " + params);
}
if (params instanceof PercentLayoutParams) {
PercentLayoutInfo info =
((PercentLayoutParams) params).getPercentLayoutInfo();
if (info != null) {
if (shouldHandleMeasuredWidthTooSmall(view, info)) {
needsSecondMeasure = true;
params.width = ViewGroup.LayoutParams.WRAP_CONTENT;
}
if (shouldHandleMeasuredHeightTooSmall(view, info)) {
needsSecondMeasure = true;
params.height = ViewGroup.LayoutParams.WRAP_CONTENT;
}
}
}
}
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "should trigger second measure pass: " + needsSecondMeasure);
}
return needsSecondMeasure;
}

首先遍历所有的孩子,拿出孩子的layoutparams,如果是PercentLayoutParams实例,则取出info。如果info不为null,调用shouldHandleMeasuredWidthTooSmall判断:

private static boolean shouldHandleMeasuredWidthTooSmall(View view, PercentLayoutInfo info) {
int state = ViewCompat.getMeasuredWidthAndState(view) & ViewCompat.MEASURED_STATE_MASK;
return state == ViewCompat.MEASURED_STATE_TOO_SMALL && info.widthPercent >= 0 &&
info.mPreservedParams.width == ViewGroup.LayoutParams.WRAP_CONTENT;
}

这里就是判断,如果你设置的measuredWidth或者measureHeight过小的话,并且你在布局文件中layout_w/h 设置的是WRAP_CONTENT的话,将params.width / height= ViewGroup.LayoutParams.WRAP_CONTENT,然后重新测量。

哈,onMeasure终于结束了~~~现在我觉得应该代码结束了吧,尺寸都设置好了,还需要干嘛么,but,你会发现onLayout也重写了,我们又不改变layout规则,在onLayout里面干什么毛线:

@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
mHelper.restoreOriginalParams();
}

继续看mHelper.restoreOriginalParams

 /**
* Iterates over children and restores their original dimensions that were changed for
* percentage values. Calling this method only makes sense if you previously called
* {@link PercentLayoutHelper#adjustChildren(int, int)}.
*/
public void restoreOriginalParams() {
for (int i = 0, N = mHost.getChildCount(); i < N; i++) {
View view = mHost.getChildAt(i);
ViewGroup.LayoutParams params = view.getLayoutParams();
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "should restore " + view + " " + params);
}
if (params instanceof PercentLayoutParams) {
PercentLayoutInfo info =
((PercentLayoutParams) params).getPercentLayoutInfo();
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "using " + info);
}
if (info != null) {
if (params instanceof ViewGroup.MarginLayoutParams) {
info.restoreMarginLayoutParams((ViewGroup.MarginLayoutParams) params);
} else {
info.restoreLayoutParams(params);
}
}
}
}
}

噗,原来是重新恢复原本的尺寸值,也就是说onMeasure里面的对值进行了改变,测量完成后。在这个地方,将值又恢复成如果布局文件中的值,上面写的都是0。恢复很简单:


public void restoreLayoutParams(ViewGroup.LayoutParams params) {
params.width = mPreservedParams.width;
params.height = mPreservedParams.height;
}

你应该没有忘在哪存的把~忘了的话,麻烦Ctrl+F ‘mPreservedParams.width’ 。

也就是说,你去打印上面写法,布局文件中view的v.getLayoutParams().width,这个值应该是0。

这里感觉略微不爽~这个0没撒用处呀,还不如不重置~~

好了,到此就分析完了,其实主要就几个步骤:

  • LayoutParams中属性的获取
  • onMeasure中,改变params.width为百分比计算结果,测量
  • 如果测量值过小且设置的w/h是wrap_content,重新测量
  • onLayout中,重置params.w/h为布局文件中编写的值

可以看到,有了RelativeLayout、FrameLayout的扩展,竟然没有LinearLayout几个意思。好在,我们的核心代码都由PercentLayoutHelper封装了,自己扩展下LinearLayout也不复杂。


三、实现PercentLinearlayout

可能有人会说,有了weight呀,但是weight能做到宽、高同时百分比赋值嘛?

好了,代码很简单,如下:


(一)PercentLinearLayout

package com.juliengenoud.percentsamples;

import android.content.Context;
import android.content.res.TypedArray;
import android.support.percent.PercentLayoutHelper;
import android.util.AttributeSet;
import android.view.ViewGroup;
import android.widget.LinearLayout; /**
* Created by zhy on 15/6/30.
*/
public class PercentLinearLayout extends LinearLayout
{ private PercentLayoutHelper mPercentLayoutHelper; public PercentLinearLayout(Context context, AttributeSet attrs)
{
super(context, attrs); mPercentLayoutHelper = new PercentLayoutHelper(this);
} @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
mPercentLayoutHelper.adjustChildren(widthMeasureSpec, heightMeasureSpec);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mPercentLayoutHelper.handleMeasuredStateTooSmall())
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
} @Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
super.onLayout(changed, l, t, r, b);
mPercentLayoutHelper.restoreOriginalParams();
} @Override
public LayoutParams generateLayoutParams(AttributeSet attrs)
{
return new LayoutParams(getContext(), attrs);
} public static class LayoutParams extends LinearLayout.LayoutParams
implements PercentLayoutHelper.PercentLayoutParams
{
private PercentLayoutHelper.PercentLayoutInfo mPercentLayoutInfo; public LayoutParams(Context c, AttributeSet attrs)
{
super(c, attrs);
mPercentLayoutInfo = PercentLayoutHelper.getPercentLayoutInfo(c, attrs);
} @Override
public PercentLayoutHelper.PercentLayoutInfo getPercentLayoutInfo()
{
return mPercentLayoutInfo;
} @Override
protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr)
{
PercentLayoutHelper.fetchWidthAndHeight(this, a, widthAttr, heightAttr);
} public LayoutParams(int width, int height) {
super(width, height);
} public LayoutParams(ViewGroup.LayoutParams source) {
super(source);
} public LayoutParams(MarginLayoutParams source) {
super(source);
} } }

如果你详细看了上面的源码分析,这个代码是不是没撒解释的了~


(二)测试布局

<?xml version="1.0" encoding="utf-8"?>

<com.juliengenoud.percentsamples.PercentLinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"> <TextView
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#ff44aacc"
android:text="width:60%,height:5%"
android:textColor="#ffffff"
app:layout_heightPercent="5%"
app:layout_marginBottomPercent="5%"
app:layout_widthPercent="60%"/> <TextView
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#ff4400cc"
android:gravity="center"
android:textColor="#ffffff"
android:text="width:70%,height:10%"
app:layout_heightPercent="10%"
app:layout_marginBottomPercent="5%"
app:layout_widthPercent="70%"/>
<TextView
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#ff44aacc"
android:gravity="center"
android:text="width:80%,height:15%"
android:textColor="#ffffff"
app:layout_heightPercent="15%"
app:layout_marginBottomPercent="5%"
app:layout_widthPercent="80%"/>
<TextView
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#ff4400cc"
android:gravity="center"
android:text="width:90%,height:5%"
android:textColor="#ffffff"
app:layout_heightPercent="20%"
app:layout_marginBottomPercent="10%"
app:layout_widthPercent="90%"/> <TextView
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#ff44aacc"
android:gravity="center"
android:text="width:100%,height:25%"
android:textColor="#ffffff"
app:layout_heightPercent="25%"
app:layout_marginBottomPercent="5%"
/> </com.juliengenoud.percentsamples.PercentLinearLayout>

我们纵向排列的几个TextView,分别设置宽/高都为百分比,且之间的间隔为5%p。


(三)效果图

Android 百分比布局库(percent-support-lib) 解析与扩展

ok,到此,我们使用、源码分析、扩展PercentLinearLayout就结束了。

添加PercentLinearLayout后的地址:点击查看

扩展下载:android-percent-support-extend 包含android studio, eclipse项目,以及上述源码。

~~have a nice day ~~

新浪微博

群号:463081660

微信公众号:hongyangAndroid

(欢迎关注,第一时间推送博文信息)

Android 百分比布局库(percent-support-lib) 解析与扩展

版权声明:本文为博主原创文章,未经博主允许不得转载。

上一篇:[Spark] Hello Spark


下一篇:NeHe OpenGL教程 第二十七课:影子