自定义view之热门标签
相信很多项目中都需要用到热门标签，效果如下：
代码实现
1、自定义热门标签的ViewGroup实现
package com.tsne.playindx.common;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;
public class FlowLayout extends ViewGroup {
public FlowLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
//
}
public FlowLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FlowLayout(Context context) {
this(context, null);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
// wrap_content
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++) {
View child = getChildAt(i);
// 测量子View的宽和高
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
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);
}
// 最后一个控件
if (i == cCount - 1) {
width = Math.max(lineWidth, width);
height += lineHeight;
}
}
Log.e("TAG", "sizeWidth = " + sizeWidth);
Log.e("TAG", "sizeHeight = " + sizeHeight);
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>();
@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;
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);
}
}
2、引用自定义控件：
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/bg_color"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:text="@string/hot_search"
android:textColor="@color/black"
android:textSize="18sp" />
<com.tsne.playindx.common.FlowLayout
android:id="@+id/search_xc_flow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp"
android:layout_marginLeft="40dp"
android:layout_marginRight="40dp"
android:layout_marginTop="20dp" />
</LinearLayout>3、如何使用该自定义的热门标签控件类
private String mNames[] = {
"welcome", "android", "TextView",
"apple", "a", "n",
"jordan", "bvc", "c",
"margin", "padding", "text",
"name", "type", "searchsearch", "logcatlogcatlogcat"
};
private void initView() {
LayoutInflater mInflater = LayoutInflater.from(this);
for (int i = 0; i < mNames.length; i++) {
TextView tv = (TextView) mInflater.inflate(R.layout.flow_tv,
mFlowLayout, false);
tv.setText(mNames[i]);
mFlowLayout.addView(tv);
}
}
4、自定义textview属性背景
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#666666" />
<corners android:radius="10dp" />
<padding android:bottom="5dp" android:left="5dp" android:right="5dp" android:top="5dp" />
</shape>