一、测试效果未成功
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package
cn.app.meiya.aa.widget;
import
android.content.Context;
import
android.util.AttributeSet;
import
android.view.View;
import
android.view.ViewGroup;
import
java.util.ArrayList;
import
java.util.List;
/**
* 类似话题标签的流式布局,测试效果无效
* http://www.apkbus.com/android-239725-1-1.html
* Created by lonshine on 15/7/16.
*/
public
class
TopicFlowLayout
extends
ViewGroup {
//存储所有子View
private
List<List<View>> mAllChildViews =
new
ArrayList<>();
//每一行的高度
private
List<Integer> mLineHeight =
new
ArrayList<>();
public
TopicFlowLayout(Context context) {
this
(context,
null
);
// TODO Auto-generated constructor stub
}
public
TopicFlowLayout(Context context, AttributeSet attrs) {
this
(context, attrs,
0
);
// TODO Auto-generated constructor stub
}
public
TopicFlowLayout(Context context, AttributeSet attrs,
int
defStyle) {
super
(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}
@Override
protected
void
onMeasure(
int
widthMeasureSpec,
int
heightMeasureSpec) {
// TODO Auto-generated method stub
//父控件传进来的宽度和高度以及对应的测量模式
int
sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int
modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int
sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int
modeHeight = MeasureSpec.getMode(heightMeasureSpec);
//如果当前ViewGroup的宽高为wrap_content的情况
int
width =
0
;
//自己测量的 宽度
int
height =
0
;
//自己测量的高度
//记录每一行的宽度和高度
int
lineWidth =
0
;
int
lineHeight =
0
;
//获取子view的个数
int
childCount = getChildCount();
for
(
int
i =
0
; i < childCount; i++) {
View child = getChildAt(i);
//测量子View的宽和高
measureChild(child, widthMeasureSpec, heightMeasureSpec);
//得到LayoutParams
MarginLayoutParams lp = (MarginLayoutParams) getLayoutParams();
//子View占据的宽度
int
childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
//子View占据的高度
int
childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;
//换行时候
if
(lineWidth + childWidth > sizeWidth) {
//对比得到最大的宽度
width = Math.max(width, lineWidth);
//重置lineWidth
lineWidth = childWidth;
//记录行高
height += lineHeight;
lineHeight = childHeight;
}
else
{
//不换行情况
//叠加行宽
lineWidth += childWidth;
//得到最大行高
lineHeight = Math.max(lineHeight, childHeight);
}
//处理最后一个子View的情况
if
(i == childCount -
1
) {
width = Math.max(width, lineWidth);
height += lineHeight;
}
}
//wrap_content
setMeasuredDimension(modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width,
modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height);
super
.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected
void
onLayout(
boolean
changed,
int
l,
int
t,
int
r,
int
b) {
// TODO Auto-generated method stub
mAllChildViews.clear();
mLineHeight.clear();
//获取当前ViewGroup的宽度
int
width = getWidth();
int
lineWidth =
0
;
int
lineHeight =
0
;
//记录当前行的view
List<View> lineViews =
new
ArrayList<View>();
int
childCount = getChildCount();
for
(
int
i =
0
; i < childCount; i++) {
View child = getChildAt(i);
MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
int
childWidth = child.getMeasuredWidth();
int
childHeight = child.getMeasuredHeight();
//如果需要换行
if
(childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width) {
//记录LineHeight
mLineHeight.add(lineHeight);
//记录当前行的Views
mAllChildViews.add(lineViews);
//重置行的宽高
lineWidth =
0
;
lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
//重置view的集合
lineViews =
new
ArrayList();
}
lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin);
lineViews.add(child);
}
//处理最后一行
mLineHeight.add(lineHeight);
mAllChildViews.add(lineViews);
//设置子View的位置
int
left =
0
;
int
top =
0
;
//获取行数
int
lineCount = mAllChildViews.size();
for
(
int
i =
0
; i < lineCount; i++) {
//当前行的views和高度
lineViews = mAllChildViews.get(i);
lineHeight = mLineHeight.get(i);
for
(
int
j =
0
; j < lineViews.size(); j++) {
View child = lineViews.get(j);
//判断是否显示
if
(child.getVisibility() == View.GONE) {
continue
;
}
MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
int
cLeft = left + lp.leftMargin;
int
cTop = top + lp.topMargin;
int
cRight = cLeft + child.getMeasuredWidth();
int
cBottom = cTop + child.getMeasuredHeight();
//进行子View进行布局
child.layout(cLeft, cTop, cRight, cBottom);
left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
}
left =
0
;
top += lineHeight;
}
}
/**
* 与当前ViewGroup对应的LayoutParams
*/
@Override
public
LayoutParams generateLayoutParams(AttributeSet attrs) {
// TODO Auto-generated method stub
return
new
MarginLayoutParams(getContext(), attrs);
}
}
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用法:
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<font color=
"#362e2b"
><font style=
"background-color:rgb(255, 255, 255)"
><font face=
"Arial"
><font style=
"font-size:14px"
>
package
com.czm.flowlayout;
import
android.app.Activity;
import
android.graphics.Color;
import
android.os.Bundle;
import
android.view.ViewGroup.LayoutParams;
import
android.view.ViewGroup.MarginLayoutParams;
import
android.widget.TextView;
/**
*
* @author caizhiming
* @created on 2015-4-13
*/
public
class
MainActivity
extends
Activity {
private
String mNames[] = {
"welcome"
,
"android"
,
"TextView"
,
"apple"
,
"jamy"
,
"kobe bryant"
,
"jordan"
,
"layout"
,
"viewgroup"
,
"margin"
,
"padding"
,
"text"
,
"name"
,
"type"
,
"search"
,
"logcat"
};
private
XCFlowLayout mFlowLayout;
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initChildViews();
}
private
void
initChildViews() {
// TODO Auto-generated method stub
mFlowLayout = (XCFlowLayout) findViewById(R.id.flowlayout);
MarginLayoutParams lp =
new
MarginLayoutParams(
LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
lp.leftMargin =
5
;
lp.rightMargin =
5
;
lp.topMargin =
5
;
lp.bottomMargin =
5
;
for
(
int
i =
0
; i < mNames.length; i ++){
TextView view =
new
TextView(
this
);
view.setText(mNames[i]);
view.setTextColor(Color.WHITE);
view.setBackgroundDrawable(getResources().getDrawable(R.drawable.textview_bg));
mFlowLayout.addView(view,lp);
}
}
}</font></font></font></font>
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二、测试可用
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package
cn.app.meiya.aa.widget;
import
android.content.Context;
import
android.util.AttributeSet;
import
android.view.View;
import
android.view.ViewGroup;
/**
* http://www.bkjia.com/Androidjc/1013458.html
* Created by lonshine on 15/7/16.
*/
public
class
FlowLayout
extends
ViewGroup {
private
float
mVerticalSpacing;
//每个item纵向间距
private
float
mHorizontalSpacing;
//每个item横向间距
public
FlowLayout(Context context) {
super
(context);
}
public
FlowLayout(Context context, AttributeSet attrs) {
super
(context, attrs);
}
public
void
setHorizontalSpacing(
float
pixelSize) {
mHorizontalSpacing = pixelSize;
}
public
void
setVerticalSpacing(
float
pixelSize) {
mVerticalSpacing = pixelSize;
}
@Override
protected
void
onMeasure(
int
widthMeasureSpec,
int
heightMeasureSpec) {
int
selfWidth = resolveSize(
0
, widthMeasureSpec);
int
paddingLeft = getPaddingLeft();
int
paddingTop = getPaddingTop();
int
paddingRight = getPaddingRight();
int
paddingBottom = getPaddingBottom();
int
childLeft = paddingLeft;
int
childTop = paddingTop;
int
lineHeight =
0
;
//通过计算每一个子控件的高度，得到自己的高度
for
(
int
i =
0
, childCount = getChildCount(); i < childCount; ++i) {
View childView = getChildAt(i);
LayoutParams childLayoutParams = childView.getLayoutParams();
childView.measure(
getChildMeasureSpec(widthMeasureSpec, paddingLeft + paddingRight,
childLayoutParams.width),
getChildMeasureSpec(heightMeasureSpec, paddingTop + paddingBottom,
childLayoutParams.height));
int
childWidth = childView.getMeasuredWidth();
int
childHeight = childView.getMeasuredHeight();
lineHeight = Math.max(childHeight, lineHeight);
if
(childLeft + childWidth + paddingRight > selfWidth) {
childLeft = paddingLeft;
childTop += mVerticalSpacing + lineHeight;
lineHeight = childHeight;
}
else
{
childLeft += childWidth + mHorizontalSpacing;
}
}
int
wantedHeight = childTop + lineHeight + paddingBottom;
setMeasuredDimension(selfWidth, resolveSize(wantedHeight, heightMeasureSpec));
}
@Override
protected
void
onLayout(
boolean
changed,
int
l,
int
t,
int
r,
int
b) {
int
myWidth = r - l;
int
paddingLeft = getPaddingLeft();
int
paddingTop = getPaddingTop();
int
paddingRight = getPaddingRight();
int
childLeft = paddingLeft;
int
childTop = paddingTop;
int
lineHeight =
0
;
//根据子控件的宽高，计算子控件应该出现的位置。
for
(
int
i =
0
, childCount = getChildCount(); i < childCount; ++i) {
View childView = getChildAt(i);
if
(childView.getVisibility() == View.GONE) {
continue
;
}
int
childWidth = childView.getMeasuredWidth();
int
childHeight = childView.getMeasuredHeight();
lineHeight = Math.max(childHeight, lineHeight);
if
(childLeft + childWidth + paddingRight > myWidth) {
childLeft = paddingLeft;
childTop += mVerticalSpacing + lineHeight;
lineHeight = childHeight;
}
childView.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
childLeft += childWidth + mHorizontalSpacing;
}
}
}
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本文转自 glblong 51CTO博客，原文链接：http://blog.51cto.com/glblong/1675221，如需转载请自行联系原作者
