Android listview点赞问题分析

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;  }}

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[]  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);      }    });  }}

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);  }}

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);  }}

<?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>

<?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>

<?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>