下面是创建一个类继承ViewGroup从而实现FlowLayout布局的,先来看一下效果图:
flow_text属性:
自定义FlowLayout代码:
package FlowLayout;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;
/**
* Created by ZhangTAO on 2017/11/14.
*/
public class flowlayout extends ViewGroup{
private int width_size;
public flowlayout(Context context) {
this(context,null);
}
public flowlayout(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public flowlayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initView(context, attrs,0);
}
private void initView(Context context, AttributeSet attrs, int i) {
}
/**
* 负责设置子控件的测量模式和大小 根据所有子控件设置自己的宽和高
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
// 如果是warp_content情况下,记录宽和高
int width = 0;
int height = 0;
// 记录每一行的宽度与高度
int lineWidth = 0;
int lineHeight = 0;
// 得到内部元素的个数
int cCount = getChildCount();
for (int i = 0; i < cCount; i++)
{
// 通过索引拿到每一个子view
View child = getChildAt(i);
// 测量子View的宽和高,系统提供的measureChild
measureChild(child, widthMeasureSpec, heightMeasureSpec);
// 得到LayoutParams
MarginLayoutParams lp = (MarginLayoutParams) child
.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 判断 当前的宽度大于 开辟新行
if (lineWidth + childWidth > sizeWidth - getPaddingLeft() - getPaddingRight())
{
// 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
// 未换行
{
// 叠加行宽
lineWidth += childWidth;
// 得到当前行最大的高度
lineHeight = Math.max(lineHeight, childHeight);
}
// 特殊情况,最后一个控件
if (i == cCount - 1)
{
width = Math.max(lineWidth, width);
height += lineHeight;
}
}
setMeasuredDimension(
modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width + getPaddingLeft() + getPaddingRight(),
modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height + getPaddingTop() + getPaddingBottom()//
);
}
/**
* 存储所有的View
*/
private List<List<View>> mAllViews = new ArrayList<List<View>>();
/**
* 每一行的高度
*/
private List<Integer> mLineHeight = new ArrayList<Integer>();
//Layout
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mAllViews.clear();
mLineHeight.clear();
// 当前ViewGroup的宽度
int width = getWidth();
int lineWidth = 0;
int lineHeight = 0;
// 存放每一行的子view
List<View> lineViews = new ArrayList<View>();
int cCount = getChildCount();
for (int i = 0; i < cCount; 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 - getPaddingLeft() - getPaddingRight())
{
// 记录LineHeight
mLineHeight.add(lineHeight);
// 记录当前行的Views
mAllViews.add(lineViews);
// 重置我们的行宽和行高
lineWidth = 0;
lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
// 重置我们的View集合
lineViews = new ArrayList<View>();
}
lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
lineHeight = Math.max(lineHeight, childHeight + lp.topMargin
+ lp.bottomMargin);
lineViews.add(child);
}// for end
// 处理最后一行
mLineHeight.add(lineHeight);
mAllViews.add(lineViews);
// 设置子View的位置
int left = getPaddingLeft();
int top = getPaddingTop();
// 行数
int lineNum = mAllViews.size();
for (int i = 0; i < lineNum; i++)
{
// 当前行的所有的View
lineViews = mAllViews.get(i);
lineHeight = mLineHeight.get(i);
for (int j = 0; j < lineViews.size(); j++)
{
View child = lineViews.get(j);
// 判断child的状态
if (child.getVisibility() == View.GONE)
{
continue;
}
MarginLayoutParams lp = (MarginLayoutParams) child
.getLayoutParams();
int lc = left + lp.leftMargin;
int tc = top + lp.topMargin;
int rc = lc + child.getMeasuredWidth();
int bc = tc + child.getMeasuredHeight();
// 为子View进行布局
child.layout(lc, tc, rc, bc);
left += child.getMeasuredWidth() + lp.leftMargin
+ lp.rightMargin;
}
left = getPaddingLeft();
top += lineHeight;
}
}
/**
* 与当前ViewGroup对应的LayoutParams
*/
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs)
{
return new MarginLayoutParams(getContext(), attrs);
}
}
然后将自定义好的控件写入XML布局文件:<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal"
android:background="#eee"
android:gravity="center">
<ImageView
android:layout_width="30dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="@drawable/left"
android:id="@+id/home_search_image"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"/>
<EditText
android:layout_width="240dp"
android:layout_height="35dp"
android:clickable="true"
android:id="@+id/home_search_edit"
android:hint="阿魁出血大甩卖"
android:focusedByDefault="true"
android:drawableRight="@drawable/preson"
android:drawableLeft="@drawable/web_select"
android:paddingRight="10dp"
android:background="@drawable/edit_shape"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp"
android:layout_gravity="center"
android:layout_marginLeft="18dp"
android:id="@+id/home_search_text"
android:layout_marginRight="15dp"
android:text="搜索"/>
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="10dp"
android:background="#e1e1ef"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp"
android:textStyle="bold"
android:layout_marginLeft="10dp"
android:text="热搜"
android:layout_marginTop="25dp"/>
<FlowLayout.flowlayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:id="@+id/id_flowlayout"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="鱿鱼丝" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="三只松鼠" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="碧根果" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="康师傅" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="飞利浦剃须刀" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="小米MIX2" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="小梅的零食" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="三星手机" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="联想笔记本" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="全国通用流量" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="#000"
android:background="@drawable/flow_text"
android:textSize="18sp"
android:padding="10dp"
android:text="九阳豆浆机" />
</FlowLayout.flowlayout>
</LinearLayout>
布局中只写flowlayout控件以及控件中包含的多个TextView即可。TextView中background属性是自己写的。flow_text属性:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle"
>
<corners
android:radius="5dp"
></corners>
<solid
android:color="#00000000"
></solid>
<stroke
android:width="1dp"
android:color="#000"
></stroke>
</shape>
自定义FlowLayout布局就写好了。