历史搜索，FlowLayout流式布局
1、概述
FlowLayout， 流式布局， 这个概念在移动端或者前端开发中很常见，特别是在多标签的展示中， 往往起到了关键的作用。然而Android 官方， 并没有为开发者提供这样一个布局， 于是有很多开发者自己做了这样的工作，github上也出现了很多自定义FlowLayout。 最近， 我也实现了这样一个FlowLayout，自己感觉可能是当前最好用的FlowLayout了，在这里做一下分享。
2、代码
先上图
挺简单的FlowLayout，我这里只是做了一个EditText ，和FlowLayout 相结合 在一起使用，点击FlowLayout 显示在EditText中。
1.1 自定义 FlowLayout
package com.hongtao.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;
public class FlowLayout extends ViewGroup {
public FlowLayout(Context context) {
super(context);
}
public FlowLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@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);
// 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> mAllViews = new ArrayList>();
/**
* 每一行的高度
*/
private List mLineHeight = new ArrayList();
@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 lineViews = new ArrayList();
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();
}
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);
}
}
1.2 xml中注入 FlowLayout
package com.hongtao.flowlayout;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
/**
* name:WangZheng
* time:2017年7月20日16:02:16
*/
public class MainActivity extends AppCompatActivity {
private FlowLayout mFlowLayout;
private LayoutInflater mInflater;
private String[] searchHotStr={"苹果","香蕉","梨","超级棒棒糖","荔枝","榴莲","西瓜","草莓","火龙果","樱桃"};
private EditText search_edit_include;
private ImageView search_edit_close;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initListener();
initView();
}
private void initListener() {
mInflater = LayoutInflater.from(this);
mFlowLayout = (FlowLayout) findViewById(R.id.id_flowlayout);
search_edit_include = (EditText) findViewById(R.id.search_edit_include);
search_edit_close = (ImageView) findViewById(R.id.search_edit_close);
//清空 EditText
search_edit_close.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
search_edit_include.setText("");
}
});
//对搜索框进行监听
search_edit_include.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
//判断 x 图片是否显示
if (search_edit_include.getText().toString().trim().length()==0){
search_edit_close.setVisibility(View.GONE);
}else{
search_edit_close.setVisibility(View.VISIBLE);
}
}
});
search_edit_include.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
//点击搜索后的操作
if (TextUtils.isEmpty(search_edit_include.getText().toString().trim())) {
Toast.makeText(getBaseContext(), "请输入内容", Toast.LENGTH_SHORT).show();
// search_null_rl.setVisibility(View.GONE);
} else {
/*判断是否是“搜索”键*/
if (actionId == EditorInfo.IME_ACTION_SEARCH) {
/*隐藏软键盘*/
InputMethodManager imm = (InputMethodManager) v
.getContext().getSystemService(
Context.INPUT_METHOD_SERVICE);
if (imm.isActive()) {
imm.hideSoftInputFromWindow(
v.getApplicationWindowToken(), 0);
}
}
return true;
}
return false;
}
});
}
private void initView() {
for (int i = 0; i < searchHotStr.length; i++) {
TextView tv = (TextView) mInflater.inflate(
R.layout.search_label_tv, mFlowLayout, false);
tv.setText(searchHotStr[i]);
final String str = tv.getText().toString();
//点击事件
tv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
search_edit_include.setText(str);
Toast.makeText(MainActivity.this,str+"",Toast.LENGTH_SHORT).show();
}
});
mFlowLayout.addView(tv);
}
}
}
2.4 下面是 FlowLayout 中子布局View
好啦！！！一个简单的FlowLayout 就完工啦！是不是挺简单的！其实很多东西就是挺简单的，好记性不如烂笔头！好多东西 不记过几天就忘了！所以记一下喽......大神勿喷，我还是一只正在进步的菜鸟