流布局Flowlayoiut
直接上代码：
1 ViewGroup 的使用
/**
* 个人理解,容器的布局执行过程 1 父容器调用measureChildren 2 子容器调用measure 计算当前容器的宽高和其子容器的宽高 3
* 当前执行的这个子容器触发onMeasure ，设置当前子容器的宽高 4 当前容器调用onLayout ， 来展示当前容器的显示
*/
public class CustomFlowlayoutContainer extends ViewGroup {
public CustomFlowlayoutContainer(Context context) {
super(context);
}
// attrs 是xml中配置的参数会传到这里
public CustomFlowlayoutContainer(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
return new MarginLayoutParams(getContext(), attrs);
}
/**
*
* 根据父类传入的 widthMeasureSpec和heightMeasureSpec计算本类和其子类的宽高
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 获得它的父容器为它设置的测量模式和大小
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);//容器的模式为fill_parent或者固定大小，所以这个值为容器宽度
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
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，width不断取最大宽度
*/
int lineWidth = 0;
/**
* 每一行的高度，累加至height
*/
int lineHeight = 0;
int cCount = getChildCount();
// 遍历每个子元素
for (int i = 0; i < cCount; i++) {
View child = getChildAt(i);
// 测量每一个child的宽和高
measureChild(child, widthMeasureSpec, heightMeasureSpec);
// 得到child的lp
MarginLayoutParams lp = (MarginLayoutParams) child
.getLayoutParams();
// 当前子控件实际占据的宽度
int childWidth = child.getMeasuredWidth() + lp.leftMargin
+ lp.rightMargin;
// 当前子控件实际占据的高度
int childHeight = child.getMeasuredHeight() + lp.topMargin
+ lp.bottomMargin;
/**
* 如果加入当前child，则超出最大宽度，则的到目前最大宽度给width，类加height 然后开启新行
*/
if (lineWidth + childWidth > sizeWidth) {
width = Math.max(lineWidth, childWidth);// 取最大的
lineWidth = childWidth; // 重新开启新行，开始记录
// 叠加当前高度，
height += lineHeight;
// 开启记录下一行的高度
lineHeight = childHeight;
} else
// 否则累加值lineWidth,lineHeight取最大高度
{
lineWidth += childWidth;
lineHeight = Math.max(lineHeight, childHeight);
}
// 如果是最后一个，则将当前记录的最大宽度和当前lineWidth做比较
if (i == cCount - 1) {
width = Math.max(width, lineWidth);
height += lineHeight;
}
}
//一般流式布局宽为EXACTLY所以数值为sizeWidth，高为wrap_content 为计算的height
setMeasuredDimension((modeWidth == MeasureSpec.EXACTLY) ? sizeWidth
: width, (modeHeight == MeasureSpec.EXACTLY) ? sizeHeight
: height);
}
/**
* 存储所有的View，按行记录
*/
private List<List<View>> mAllViews = new ArrayList<List<View>>();
/**
* 记录每一行的最大高度
*/
private List<Integer> mLineHeight = new ArrayList<Integer>();
/**
* 对其所有childView进行定位
*/
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
//每次布局前要清零
mAllViews.clear();
mLineHeight.clear();
int width = getWidth();
int lineWidth = 0;
int lineHeight = 0;
// 存储每一行所有的childView
List<View> lineViews = new ArrayList<View>();
int cCount = getChildCount();
// 遍历所有的孩子
for (int i = 0; i < cCount; i++)
{
View child = getChildAt(i);
MarginLayoutParams lp = (MarginLayoutParams) child
.getLayoutParams();
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
// 如果已经需要换行
if (childWidth + lp.leftMargin + lp.rightMargin + lineWidth > width)
{
// 记录这一行所有的View以及最大高度
mLineHeight.add(lineHeight);
// 将当前行的childView保存，然后开启新的ArrayList保存下一行的childView
mAllViews.add(lineViews);
lineWidth = 0;// 重置行宽
lineViews = new ArrayList<View>();
}
/**
* 如果不需要换行，则累加
*/
lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
lineHeight = Math.max(lineHeight, childHeight + lp.topMargin
+ lp.bottomMargin);
lineViews.add(child);
}
// 记录最后一行
mLineHeight.add(lineHeight);
mAllViews.add(lineViews);
int left = 0;
int top = 0;
// 得到总行数
int lineNums = mAllViews.size();
for (int i = 0; i < lineNums; i++)
{
// 每一行的所有的views
lineViews = mAllViews.get(i);
// 当前行的最大高度
lineHeight = mLineHeight.get(i);
Log.e("位置", "第" + i + "行 ：" + lineViews.size() + " , " + lineViews);
Log.e("位置", "第" + i + "行， ：" + lineHeight);
// 遍历当前行所有的View
for (int j = 0; j < lineViews.size(); j++)
{
View child = lineViews.get(j);
if (child.getVisibility() == View.GONE)
{
continue;
}
MarginLayoutParams lp = (MarginLayoutParams) child
.getLayoutParams();
//计算childView的left,top,right,bottom
int lc = left + lp.leftMargin;
int tc = top + lp.topMargin;
int rc =lc + child.getMeasuredWidth();
int bc = tc + child.getMeasuredHeight();
Log.e("位置", child + " , l = " + lc + " , t = " + t + " , r ="
+ rc + " , b = " + bc);
child.layout(lc, tc, rc, bc);
left += child.getMeasuredWidth() + lp.rightMargin
+ lp.leftMargin;
}
left = 0;
top += lineHeight;
}
}
}2 Activity代码
public class TestFlowlayoutActivity extends Activity implements OnClickListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_flowlayout );
//DisplayUtil displayUtil = new DisplayUtil(getWindowManager());
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.start:
break;
default:
break;
}
}
}3 xml 代码
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#E1E6F6"
android:orientation="vertical" >
<com.example.fragmentdemo1.widget.CustomFlowlayoutContainer
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:background="@drawable/button_bg"
android:text="Welcome" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:background="@drawable/button_bg"
android:text="IT工程师" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:background="@drawable/button_bg"
android:text="努力啊" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:background="@drawable/button_bg"
android:text="学习挣钱" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:background="@drawable/button_bg"
android:text="攒钱娶媳妇了" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:background="@drawable/button_bg"
android:text="攒钱买房子了" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:background="@drawable/button_bg"
android:text="攒钱买车子了，什么时候出去玩玩" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:background="@drawable/button_bg"
android:text="一辈子就这样没了，该出去休息一下了" />
</com.example.fragmentdemo1.widget.CustomFlowlayoutContainer>
</LinearLayout>4 背景代码button_bg.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- 填充色 -->
<solid android:color="#FFFFFF" >
</solid>
<!-- 圆角 -->
<corners android:radius="20dp"/>
<!-- 描边 -->
<stroke android:color="#C9C9C9" android:width="2dp"/>
<padding
android:bottom="2dp"
android:left="10dp"
android:right="10dp"
android:top="2dp" />
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