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Android listview点赞问题分析

2022-06-06 06:55

短信预约 -IT技能 免费直播动态提醒

最近这段时间一直在看Android，利用Listview去实现点赞功能

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;

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;
 
 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() {
 
 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")+"");
  
 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。

参考文章：//www.jb51.net/article/97335.htm

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listview Android

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