一、概述:
在日常的app使用中,我們會在android 的app中看見 熱門標(biāo)簽等自動換行的流式布局,今天,我們就來看看如何
創(chuàng)新互聯(lián)公司服務(wù)項(xiàng)目包括武義網(wǎng)站建設(shè)、武義網(wǎng)站制作、武義網(wǎng)頁制作以及武義網(wǎng)絡(luò)營銷策劃等。多年來,我們專注于互聯(lián)網(wǎng)行業(yè),利用自身積累的技術(shù)優(yōu)勢、行業(yè)經(jīng)驗(yàn)、深度合作伙伴關(guān)系等,向廣大中小型企業(yè)、政府機(jī)構(gòu)等提供互聯(lián)網(wǎng)行業(yè)的解決方案,武義網(wǎng)站推廣取得了明顯的社會效益與經(jīng)濟(jì)效益。目前,我們服務(wù)的客戶以成都為中心已經(jīng)輻射到武義省份的部分城市,未來相信會繼續(xù)擴(kuò)大服務(wù)區(qū)域并繼續(xù)獲得客戶的支持與信任!
自定義一個類似熱門標(biāo)簽?zāi)菢拥牧魇讲季职桑ā痢痢猎谙旅孀詈蠼o出)
類似的自定義布局。下面我們就來詳細(xì)介紹流式布局的應(yīng)用特點(diǎn)以及用的的技術(shù)點(diǎn):
1.流式布局的特點(diǎn)以及應(yīng)用場景
特點(diǎn):當(dāng)上面一行的空間不夠容納新的TextView時候,
才開辟下一行的空間
原理圖:
場景:主要用于關(guān)鍵詞搜索或者熱門標(biāo)簽等場景
2.自定義ViewGroup,重點(diǎn)重寫下面兩個方法
1、onMeasure:測量子view的寬高,設(shè)置自己的寬和高
2、onLayout:設(shè)置子view的位置
onMeasure:根據(jù)子view的布局文件中屬性,來為子view設(shè)置測量模式和測量值
測量=測量模式+測量值;
測量模式有3種:
EXACTLY:表示設(shè)置了精確的值,一般當(dāng)childView設(shè)置其寬、高為精確值、match_parent時,ViewGroup會將其設(shè)置為EXACTLY;
AT_MOST:表示子布局被限制在一個最大值內(nèi),一般當(dāng)childView設(shè)置其寬、高為wrap_content時,ViewGroup會將其設(shè)置為AT_MOST;
UNSPECIFIED:表示子布局想要多大就多大,一般出現(xiàn)在AadapterView的item的heightMode中、ScrollView的childView的heightMode中;此種模式比較少見。
3.LayoutParams
ViewGroup LayoutParams :每個 ViewGroup 對應(yīng)一個 LayoutParams; 即 ViewGroup -> LayoutParams
getLayoutParams 不知道轉(zhuǎn)為哪個對應(yīng)的LayoutParams ,其實(shí)很簡單,就是如下:
子View.getLayoutParams 得到的LayoutParams對應(yīng)的就是 子View所在的父控件的LayoutParams;
例如,LinearLayout 里面的子view.getLayoutParams ->LinearLayout.LayoutParams
所以 咱們的FlowLayout 也需要一個LayoutParams,由于上面的效果圖是子View的 margin,
所以應(yīng)該使用MarginLayoutParams。即FlowLayout->MarginLayoutParams
4.最后來看看實(shí)現(xiàn)的最終效果圖:
二、熱門標(biāo)簽的流式布局的實(shí)現(xiàn):
1. 自定義熱門標(biāo)簽的ViewGroup實(shí)現(xiàn)
根據(jù)上面的技術(shù)分析,自定義類繼承于ViewGroup,并重寫 onMeasure和onLayout等方法。具體實(shí)現(xiàn)代碼如下:
package com.czm.flowlayout;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
/**
*
* @author caizhiming
* @created on 2015-4-13
*/
public class XCFlowLayout extends ViewGroup{
//存儲所有子View
private List<List<View>> mAllChildViews = new ArrayList<>();
//每一行的高度
private List<Integer> mLineHeight = new ArrayList<>();
public XCFlowLayout(Context context) {
this(context, null);
// TODO Auto-generated constructor stub
}
public XCFlowLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
// TODO Auto-generated constructor stub
}
public XCFlowLayout(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
//父控件傳進(jìn)來的寬度和高度以及對應(yīng)的測量模式
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
//如果當(dāng)前ViewGroup的寬高為wrap_content的情況
int width = 0;//自己測量的 寬度
int height = 0;//自己測量的高度
//記錄每一行的寬度和高度
int lineWidth = 0;
int lineHeight = 0;
//獲取子view的個數(shù)
int childCount = getChildCount();
for(int i = 0;i < childCount; i ++){
View child = getChildAt(i);
//測量子View的寬和高
measureChild(child, widthMeasureSpec, heightMeasureSpec);
//得到LayoutParams
MarginLayoutParams lp = (MarginLayoutParams) getLayoutParams();
//子View占據(jù)的寬度
int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
//子View占據(jù)的高度
int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;
//換行時候
if(lineWidth + childWidth > sizeWidth){
//對比得到最大的寬度
width = Math.max(width, lineWidth);
//重置lineWidth
lineWidth = childWidth;
//記錄行高
height += lineHeight;
lineHeight = childHeight;
}else{//不換行情況
//疊加行寬
lineWidth += childWidth;
//得到最大行高
lineHeight = Math.max(lineHeight, childHeight);
}
//處理最后一個子View的情況
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();
//獲取當(dāng)前ViewGroup的寬度
int width = getWidth();
int lineWidth = 0;
int lineHeight = 0;
//記錄當(dāng)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();
//如果需要換行
if(childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width){
//記錄LineHeight
mLineHeight.add(lineHeight);
//記錄當(dāng)前行的Views
mAllChildViews.add(lineViews);
//重置行的寬高
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);
}
//處理最后一行
mLineHeight.add(lineHeight);
mAllChildViews.add(lineViews);
//設(shè)置子View的位置
int left = 0;
int top = 0;
//獲取行數(shù)
int lineCount = mAllChildViews.size();
for(int i = 0; i < lineCount; i ++){
//當(dāng)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);
//判斷是否顯示
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();
//進(jìn)行子View進(jìn)行布局
child.layout(cLeft, cTop, cRight, cBottom);
left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
}
left = 0;
top += lineHeight;
}
}
/**
* 與當(dāng)前ViewGroup對應(yīng)的LayoutParams
*/
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
// TODO Auto-generated method stub
return new MarginLayoutParams(getContext(), attrs);
}
}
2.相關(guān)的布局文件:
引用自定義控件:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.czm.flowlayout.XCFlowLayout
android:id="@+id/flowlayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</com.czm.flowlayout.XCFlowLayout>
</RelativeLayout>
TextView的樣式文件:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<solid android:color="#666666" />
<corners android:radius="10dp" />
<padding
android:left="5dp"
android:right="5dp"
android:top="5dp"
android:bottom="5dp"
/>
</shape>
三、使用該自定義布局控件類
最后,如何使用該自定義的熱門標(biāo)簽控件類呢?很簡單,請看下面實(shí)例代碼:
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);
}
}
}
四、×××
最后給出源碼的下載:http://download.csdn.net/detail/jczmdeveloper/8590113
此×××完之后,往往有個要點(diǎn)我們?nèi)菀缀雎裕蔷褪窃创a的安全性問題,此處可點(diǎn)擊移動應(yīng)用安全智能服務(wù)提供商愛加密的Android加密,源碼保護(hù)!
文章題目:Android中常見的熱門標(biāo)簽的流式布局的實(shí)現(xiàn)
網(wǎng)址分享:http://bm7419.com/article10/jcsogo.html
成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián),為您提供企業(yè)建站、關(guān)鍵詞優(yōu)化、網(wǎng)站收錄、虛擬主機(jī)、定制網(wǎng)站、外貿(mào)建站
聲明:本網(wǎng)站發(fā)布的內(nèi)容(圖片、視頻和文字)以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主,如果涉及侵權(quán)請盡快告知,我們將會在第一時間刪除。文章觀點(diǎn)不代表本網(wǎng)站立場,如需處理請聯(lián)系客服。電話:028-86922220;郵箱:631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載,或轉(zhuǎn)載時需注明來源: 創(chuàng)新互聯(lián)