实现思路其实很简单，就是一个自定义的linearlayout，并且textview能够循环垂直滚动，而且条目可以点击，显示区域最多显示2个条目，并且还有交替的属性垂直移动的动画效果，通过线程来控制滚动的实现。
不多说看效果：
代码实现
我们先来为控件设置自定义属性：
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<?xml version="1.0" encoding="utf-8"?><resources><declare-styleable name="jdadverview"><attr name="gap" format="integer" /><attr name="animduration" format="integer"/></declare-styleable></resources> |
自定义控件的获取属性方法都一样：
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//获取自定义属性typedarray array = context.obtainstyledattributes(attrs, r.styleable.jdadverview);madverheight = typedvalue.applydimension(typedvalue.complex_unit_dip, jdadverheight, getresources().getdisplaymetrics());int gap = array.getinteger(r.styleable.jdadverview_gap, mgap);int animduration = array.getinteger(r.styleable.jdadverview_animduration, manimduration);//关闭清空typedarray,防止内存泄露array.recycle(); |
然后呢，我们来看一下条目的布局：
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<?xml version="1.0" encoding="utf-8"?><linearlayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="60dp"android:background="#ffffff"android:gravity="center_vertical"android:orientation="horizontal"><textviewandroid:id="@+id/tag"android:textcolor="#ff0000"android:layout_marginleft="10dp"android:text="最新"android:background="@drawable/corner"android:textsize="18sp"android:padding="5dp"android:layout_width="wrap_content"android:layout_height="wrap_content"/><textviewandroid:id="@+id/title"android:layout_marginleft="10dp"android:singleline="true"android:ellipsize="end"android:textsize="20sp"android:text="价格惊呆！电信千兆光纤上市"android:textcolor="#000000"android:layout_width="wrap_content"android:layout_height="wrap_content"/></linearlayout> |
布局很简单，效果呢：
不解释，我们来写适配器了：
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package com.example.jdadvernotice;import android.view.layoutinflater;import android.view.view;import android.widget.textview;import android.widget.toast;import com.example.jdadvernotice.entity.advernotice;import com.example.jdadvernotice.view.jdadverview;import java.util.list;/*** created by administrator on 2016/3/20.* 京东广告栏数据适配器**/public class jdviewadapter {private list<advernotice> mdatas;public jdviewadapter(list<advernotice> mdatas) {this.mdatas = mdatas;if (mdatas == null || mdatas.isempty()) {throw new runtimeexception("nothing to show");}}/*** 获取数据的条数* @return*/public int getcount() {return mdatas == null ? 0 : mdatas.size();}/*** 获取摸个数据* @param position* @return*/public advernotice getitem(int position) {return mdatas.get(position);}/*** 获取条目布局* @param parent* @return*/public view getview(jdadverview parent) {return layoutinflater.from(parent.getcontext()).inflate(r.layout.item, null);}/*** 条目数据适配* @param view* @param data*/public void setitem(final view view, final advernotice data) {textview tv = (textview) view.findviewbyid(r.id.title);tv.settext(data.title);textview tag = (textview) view.findviewbyid(r.id.tag);tag.settext(data.url);//你可以增加点击事件view.setonclicklistener(new view.onclicklistener() {@overridepublic void onclick(view v) {//比如打开urltoast.maketext(view.getcontext(), data.url, toast.length_short).show();}});}} |
然后我们就来自定义view:
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package com.example.jdadvernotice.view;import android.animation.animator;import android.animation.animatorlisteneradapter;import android.animation.animatorset;import android.animation.objectanimator;import android.content.context;import android.content.res.configuration;import android.content.res.typedarray;import android.graphics.canvas;import android.graphics.color;import android.graphics.paint;import android.util.attributeset;import android.util.typedvalue;import android.view.view;import android.widget.linearlayout;import com.example.jdadvernotice.jdviewadapter;import com.example.jdadvernotice.r;/*** created by zengyu on 2016/3/20.*/public class jdadverview extends linearlayout {//控件高度private float madverheight = 0f;//间隔时间private final int mgap = 4000;//动画间隔时间private final int manimduration = 1000;//显示文字的尺寸private final float textsize = 20f;private jdviewadapter madapter;private final float jdadverheight = 50;//显示的viewprivate view mfirstview;private view msecondview;//播放的下标private int mposition;//线程的标识private boolean isstarted;//画笔private paint mpaint;public jdadverview(context context) {this(context, null);}public jdadverview(context context, attributeset attrs) {this(context, attrs, 0);}public jdadverview(context context, attributeset attrs, int defstyleattr) {super(context, attrs, defstyleattr);init(context, attrs, defstyleattr);}/*** 初始化属性* @param context* @param attrs* @param defstyleattr*/private void init(context context, attributeset attrs, int defstyleattr) {//设置为垂直方向setorientation(vertical);//抗锯齿效果mpaint = new paint(paint.anti_alias_flag);//获取自定义属性typedarray array = context.obtainstyledattributes(attrs, r.styleable.jdadverview);madverheight = typedvalue.applydimension(typedvalue.complex_unit_dip, jdadverheight, getresources().getdisplaymetrics());int gap = array.getinteger(r.styleable.jdadverview_gap, mgap);int animduration = array.getinteger(r.styleable.jdadverview_animduration, manimduration);if (mgap <= manimduration) {gap = mgap;animduration = manimduration;}//关闭清空typedarrayarray.recycle();}/*** 设置数据*/public void setadapter(jdviewadapter adapter) {this.madapter = adapter;setupadapter();}/*** 开启线程*/public void start() {if (!isstarted && madapter.getcount() > 1) {isstarted = true;postdelayed(mrunnable, mgap);//间隔mgap刷新一次ui}}/*** 暂停滚动*/public void stop() {//移除handle更新removecallbacks(mrunnable);//暂停线程isstarted = false;}/*** 设置数据适配*/private void setupadapter() {//移除所有viewremoveallviews();//只有一条数据,不滚东if (madapter.getcount() == 1) {mfirstview = madapter.getview(this);madapter.setitem(mfirstview, madapter.getitem(0));addview(mfirstview);} else {//多个数据mfirstview = madapter.getview(this);msecondview = madapter.getview(this);madapter.setitem(mfirstview, madapter.getitem(0));madapter.setitem(msecondview, madapter.getitem(1));//把2个添加到此控件里addview(mfirstview);addview(msecondview);mposition = 1;isstarted = false;}}/*** 测量控件的宽高** @param widthmeasurespec* @param heightmeasurespec*/@overrideprotected void onmeasure(int widthmeasurespec, int heightmeasurespec) {super.onmeasure(widthmeasurespec, heightmeasurespec);if (layoutparams.wrap_content == getlayoutparams().height) {getlayoutparams().height = (int) madverheight;} else {madverheight = getheight();}if (mfirstview != null) {mfirstview.getlayoutparams().height = (int) madverheight;}if (msecondview != null) {msecondview.getlayoutparams().height = (int) madverheight;}}/*** 画布局** @param canvas*/@overrideprotected void ondraw(canvas canvas) {super.ondraw(canvas);mpaint.setcolor(color.white);mpaint.settextsize(typedvalue.applydimension(typedvalue.complex_unit_sp, textsize, getresources().getdisplaymetrics()));mpaint.setstyle(paint.style.stroke);canvas.drawtext("瑞士维氏军刀", textsize, getheight() * 2 / 3, mpaint);//写文字2/3的高度}/*** 垂直滚蛋*/private void performswitch() {//属性动画控制控件滚动，y轴方向移动objectanimator animator1 = objectanimator.offloat(mfirstview, "translationy", mfirstview.gettranslationy() - madverheight);objectanimator animator2 = objectanimator.offloat(msecondview, "translationy", msecondview.gettranslationy() - madverheight);//动画集animatorset set = new animatorset();set.playtogether(animator1, animator2);//2个动画一起set.addlistener(new animatorlisteneradapter() {@overridepublic void onanimationend(animator animation) {//动画结束mfirstview.settranslationy(0);msecondview.settranslationy(0);view removedview = getchildat(0);//获得第一个子布局mposition++;//设置显示的布局madapter.setitem(removedview, madapter.getitem(mposition % madapter.getcount()));//移除前一个viewremoveview(removedview);//添加下一个viewaddview(removedview, 1);}});set.setduration(manimduration);//持续时间set.start();//开启动画}private animrunnable mrunnable = new animrunnable();private class animrunnable implements runnable {@overridepublic void run() {performswitch();postdelayed(this, mgap);}}/*** 销毁view的时候调用*/@overrideprotected void ondetachedfromwindow() {super.ondetachedfromwindow();//停止滚动stop();}/*** 屏幕 旋转** @param newconfig*/@overrideprotected void onconfigurationchanged(configuration newconfig) {super.onconfigurationchanged(newconfig);}} |
从上面可以看出，控件最多可以显示2个条目，并且用线程控制，根据条目的下标轮流滚动显示。
具体使用代码：
初始化数据:
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private void initdata() {datas.add(new advernotice("瑞士维氏军刀 新品满200-50","最新"));datas.add(new advernotice("家居家装焕新季，讲199减100！","最火爆"));datas.add(new advernotice("带上相机去春游，尼康低至477","hot"));datas.add(new advernotice("价格惊呆！电信千兆光纤上市","new"));} |
绑定适配器开启滚动线程：
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initdata();final jdviewadapter adapter = new jdviewadapter(datas);final jdadverview tbview = (jdadverview) findviewbyid(r.id.jdadver);tbview.setadapter(adapter);//开启线程滚东tbview.start(); |
就写到这里吧，很晚了睡觉，欢迎大家前来拍砖。
以上内容是针对android高仿京东垂直循环滚动新闻栏的全部介绍，希望对大家以上帮助！
