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Android listview點(diǎn)贊問(wèn)題分析

 更新時(shí)間：2016年11月16日 08:17:46   作者：黑蛋丶  
這篇文章主要為大家詳細(xì)解析了Android listview點(diǎn)贊功能,具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

最近這段時(shí)間一直在看Android，利用Listview去實(shí)現(xiàn)點(diǎn)贊功能

基本思路：

進(jìn)入界面–》獲取數(shù)據(jù)–》
在Listview中顯示–》
通過(guò)map集合（position,boolean）保存每一行是否被點(diǎn)擊–》
利用實(shí)體類去保存相應(yīng)的對(duì)象–》
get/set方法進(jìn)行相應(yīng)值得改變–》
點(diǎn)擊一次，相應(yīng)的數(shù)量加1

只實(shí)現(xiàn)了點(diǎn)贊功能，踩和贊基本類似。

具體實(shí)現(xiàn)如下：

繼承自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{
//用來(lái)獲取界面上的元素
 private ViewHolder holder;
 private Context context;
 //這里的Bean是個(gè)測(cè)試用的內(nèi)部類，將點(diǎn)贊數(shù)和踩得數(shù)存起來(lái)，可以定義一個(gè)類，
 //直接獲取數(shù)據(jù)就好，需要改進(jìn)下
 private List<Bean> praise_step_num = new ArrayList<Bean>();

 private LayoutInflater inflater;
 //保存當(dāng)前點(diǎn)贊數(shù)
 List<Map<String,Object>> listItems;
 /*
 根據(jù)position，保存點(diǎn)擊的是哪一行數(shù)據(jù)，默認(rèn)為false，點(diǎn)擊后改為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() {
 /*
 為相應(yīng)的數(shù)據(jù)賦值，所有的數(shù)據(jù)存儲(chǔ)在listItems中
 position一一對(duì)應(yīng)每一行數(shù)據(jù)
  */
 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) {
 //獲取贊、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")+"");
  /*
  每次會(huì)復(fù)用convertView,
  convertView沒(méi)有被賦值，就會(huì)使用之后賦值的數(shù)據(jù)，
  比如：點(diǎn)擊了第一行數(shù)據(jù)贊的按鈕，相應(yīng)的第一行點(diǎn)贊圖片變?yōu)榧t色
  當(dāng)向下滑動(dòng)頁(yè)面時(shí)，下方的也會(huì)有一項(xiàng)數(shù)據(jù)發(fā)生變化，復(fù)用
  在這里為每次重用賦值
  */
 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, "失敗", 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, "已經(jīng)點(diǎn)擊過(guò)", 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

進(jìn)行Listview值賦值，然后進(jìn)行和Adapter的綁定

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","測(cè)試","多聯(lián)","空氣能","商用","家用","測(cè)試","多聯(lián)","空氣能"};
 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);
  }
 });

 }
}

跳轉(zhuǎn)界面，測(cè)試用

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);
 }
}

簡(jiǎn)單的動(dòng)畫效果的實(shí)現(xiàn)

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子項(xiàng)

<?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="商用多聯(lián)機(jī)"
  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="時(shí)間 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>

點(diǎn)擊item后進(jìn)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>

代碼中是我對(duì)程序的理解，有的地方可能不是很明白，還得完善完善
這篇文章給了我很大幫助，動(dòng)畫效果就是搬過(guò)來(lái)的，哈哈，很不錯(cuò)，學(xué)習(xí)了。

參考文章：http://www.dbjr.com.cn/article/97335.htm

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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