Android中Listview点赞功能的实现

最近这段时间一直在看android，利用listview去实现点赞功能，下面给大家介绍下基本思路。

基本思路：

进入界面–》获取数据–》
在listview中显示–》
通过map集合（position,boolean）保存每一行是否被点击–》
利用实体类去保存相应的对象–》
get/set方法进行相应值得改变–》
点击一次，相应的数量加1

只实现了点赞功能，踩和赞基本类似。

具体实现如下：

继承自baseadapter

package com.gz.test_listview;
import android.content.context;
import android.content.dialoginterface;
import android.content.intent;
import android.os.handler;
import android.os.message;
import android.util.log;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.adapterview;
import android.widget.baseadapter;
import android.widget.button;
import android.widget.imageview;
import android.widget.listview;
import android.widget.textview;
import android.widget.toast;
import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;
/**
* created by gz on 2016/11/9.
*/
public class mainactivityadapter extends baseadapter{
//用来获取界面上的元素
private viewholder holder;
private context context;
//这里的bean是个测试用的内部类，将点赞数和踩得数存起来，可以定义一个类，
//直接获取数据就好，需要改进下
private list<bean> praise_step_num = new arraylist<bean>();
private layoutinflater inflater;
//保存当前点赞数
list<map<string,object>> listitems;
/*
根据position，保存点击的是哪一行数据，默认为false，点击后改为true
*/
private map<integer, boolean> isexist = new hashmap<integer, boolean>();
public mainactivityadapter(context context,list<map<string,object>> listitems){
this.context = context;
this.listitems = listitems;
inflater = layoutinflater.from(context);
log.i("listitem",listitems.tostring());
init();
}
private void init() {
/*
为相应的数据赋值，所有的数据存储在listitems中
position一一对应每一行数据
*/
for (int i = 0;i<listitems.size();i++){
isexist.put(i,false);
bean b = new bean();
integer praise = integer.parseint(listitems.get(i).get("praise").tostring());
b.setpraise(praise);
integer step = integer.parseint(listitems.get(i).get("step").tostring());
b.setstep(step);
praise_step_num.add(i,b);
log.i("praise_step",praise_step_num.get(i).getpraise()+"");
}
}
@override
public int getcount() {
return listitems.size() ;
}
@override
public object getitem(int position) {
return position;
}
@override
public long getitemid(int position) {
return position;
}
@override
public view getview(final int position, view convertview, viewgroup parent) {
//获取赞、踩得值
final bean bean = praise_step_num.get(position);
if(convertview == null){
holder = new viewholder();
convertview = inflater.inflate(r.layout.item_praise,null);
holder.img_praise = (imageview) convertview.findviewbyid(r.id.tv_praises_img);
holder.img_step = (imageview) convertview.findviewbyid(r.id.tv_step_img);
holder.praise = (textview) convertview.findviewbyid(r.id.tv_praises);
holder.step = (textview) convertview.findviewbyid(r.id.tv_step);
holder.title = (textview) convertview.findviewbyid(r.id.tv_name);
//holder.img_step.setimageresource(r.drawable.bad);
convertview.settag(holder);
}else{
holder = (viewholder) convertview.gettag();
}
holder.praise.settext(bean.getpraise()+"");
holder.step.settext(bean.getstep()+"");
holder.title.settext(listitems.get(position).get("title")+"");
/*
每次会复用convertview,
convertview没有被赋值，就会使用之后赋值的数据，
比如：点击了第一行数据赞的按钮，相应的第一行点赞图片变为红色
当向下滑动页面时，下方的也会有一项数据发生变化，复用
在这里为每次重用赋值
*/
if(bean.getpraise()!=0){
holder.img_praise.setimageresource(r.drawable.good);
}else{
holder.img_praise.setimageresource(r.drawable.good_no);
}
if(bean.getstep()!=0){
holder.img_step.setimageresource(r.drawable.bad);
}else{
holder.img_step.setimageresource(r.drawable.bad_no);
}
holder.img_praise.setonclicklistener(new imgclick(position,bean));
return convertview;
}
class imgclick implements view.onclicklistener {
private int position;
private bean bean;
public imgclick(int position,bean bean){
this.position = position;
this.bean = bean;
}
@override
public void onclick(final view v) {
log.i("position",position+"");
if(bean.getpraise()==0){
if(isexist.get(position) == false){
final handler handler = new handler() {
@override
public void handlemessage(message msg) {
super.handlemessage(msg);
switch (msg.what){
case 1:
imageview btn = (imageview) v;
if(v.getid() == btn.getid()) {
isexist.put(position, true);
bean.setpraise(bean.getpraise()+1);
btn.setimageresource(r.drawable.good);
animationtools.scale(btn);
notifydatasetchanged();
break;
}
case 2:
toast.maketext(context, "失败", toast.length_long).show();
break;
}
}
};
new thread(){
@override
public void run() {
message msg = new message();
msg.what=1;
handler.sendmessage(msg);
}
}.start();
}
}else{
toast.maketext(context, "已经点击过", toast.length_long).show();
}
}
}
private static class viewholder{
public imageview img_praise;
public imageview getimg_praise() {
return img_praise;
}
public imageview getimg_step() {
return img_step;
}
public textview getpraise() {
return praise;
}
public textview getstep() {
return step;
}
public textview gettitle() {
return title;
}
private imageview img_step;
public textview praise;
private textview step;
private textview title;
}
class bean{
public int getpraise() {
return praise;
}
public void setpraise(int praise) {
this.praise = praise;
}
public int getstep() {
return step;
}
public void setstep(int step) {
this.step = step;
}
private int praise;
private int step;
}
}

mainactivity

进行listview值赋值，然后进行和adapter的绑定

package com.gz.test_listview;
import android.app.activity;
import android.content.intent;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.view.view;
import android.widget.adapterview;
import android.widget.listview;
import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import java.util.objects;
public class mainactivity extends activity {
private listview listview;
private string[] title = {"商用","家用","测试","多联","空气能","商用","家用","测试","多联","空气能"};
private string[] praise = {"3","1","0","0","0","3","1","0","0","0"};
private string[] step = {"3","0","0","0","0","3","0","0","0","0"};
private arraylist<map<string,object>> map = new arraylist<map<string, object>>();
private listview listview;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
listview = (listview) findviewbyid(r.id.listview);
for(int i=0;i<title.length;i++){
map<string,object> item = new hashmap<string,object>();
item.put("title",title[i]);
item.put("praise",praise[i]);
item.put("step",step[i]);
map.add(item);
}
mainactivityadapter adapter = new mainactivityadapter(this,map);
listview.setadapter(adapter);
listview.setonitemclicklistener(new adapterview.onitemclicklistener() {
@override
public void onitemclick(adapterview<?> parent, view view, int position, long id) {
intent intent = new intent(mainactivity.this,detailactivity.class);
startactivity(intent);
}
});
}
}

跳转界面，测试用

package com.gz.test_listview;
import android.app.activity;
import android.os.bundle;
import android.widget.listview;
import java.util.arraylist;
import java.util.hashmap;
import java.util.map;
public class detailactivity extends activity {
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.detail_info);
}
}

简单的动画效果的实现

直接用就好了

package com.gz.test_listview;
import android.view.view;
import android.view.animation.animation;
import android.view.animation.scaleanimation;
public class animationtools {
public static void scale(view v) {
scaleanimation anim = new scaleanimation(1.0f, 1.5f, 1.0f, 1.5f,
animation.relative_to_self, 0.5f, animation.relative_to_self,
0.5f);
anim.setduration(300);
v.startanimation(anim);
}
}

界面

<?xml version="1.0" encoding="utf-8"?>
<relativelayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingleft="@dimen/activity_horizontal_margin"
android:paddingright="@dimen/activity_horizontal_margin"
android:paddingtop="@dimen/activity_vertical_margin"
android:paddingbottom="@dimen/activity_vertical_margin"
tools:context="com.gz.test_listview.mainactivity">
<listview
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</listview>
</relativelayout>

listview子项

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/lyt_root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ccc"
android:orientation="vertical"
android:descendantfocusability= "blocksdescendants"
>
<framelayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<imageview
android:id="@+id/has_exame"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top|left"
/>
<linearlayout
android:layout_margin="10dip"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:background="@drawable/corners"
android:layout_weight="1.0"
android:orientation="vertical"
>
<textview
android:id="@+id/tv_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textsize="14sp"
android:text="商用多联机"
android:textcolor="#000"
/>
<linearlayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<textview
android:id="@+id/tv_date"
android:layout_margintop="10dip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textsize="12sp"
android:text="时间 2016-10-10"
android:textcolor="#000"
android:visibility="visible"
/>
<textview
android:id="@+id/tv_downloads"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:textcolor="#000"
android:textsize="14sp"
android:visibility="gone" />
</linearlayout>
<linearlayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:gravity="center|right"
>
<imageview
android:id="@+id/tv_praises_img"
android:layout_width="30dip"
android:layout_height="30dip"
android:background="@drawable/good_no"
android:layout_marginright="5dip"
/>
<textview
android:id="@+id/tv_praises"
android:layout_width="50dip"
android:layout_height="wrap_content"
android:textcolor="#000"
android:text="10"
android:textsize="14dip"
android:layout_gravity="center"
/>
<imageview
android:id="@+id/tv_step_img"
android:layout_width="30dip"
android:layout_height="30dip"
android:background="@drawable/bad_no"
android:layout_marginright="5dip"
/>
<textview
android:id="@+id/tv_step"
android:layout_width="50dip"
android:layout_height="wrap_content"
android:textcolor="#000"
android:text="10"
android:textsize="14dip"
android:layout_gravity="center"
/>
</linearlayout>
</linearlayout>
</framelayout>
</linearlayout>

点击item后进入的界面

<?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="match_parent"
android:paddingleft="@dimen/activity_horizontal_margin"
android:paddingright="@dimen/activity_horizontal_margin"
android:paddingtop="@dimen/activity_vertical_margin"
android:paddingbottom="@dimen/activity_vertical_margin"
android:orientation="vertical"
>
<textview
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="111"
/>
<textview
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="111"
/>
<textview
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="111"
/>
<textview
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="111"
/>
<textview
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="111"
/>
</linearlayout>

代码中是我对程序的理解，有的地方可能不是很明白，还得完善完善

这篇文章给了我很大帮助，动画效果就是搬过来的，哈哈，很不错，学习了

以上所述是小编给大家介绍的android中listview点赞功能的实现，希望对大家有所帮助