Android中Listview點贊功能的實現

最近這段時間一直在看Android，利用Listview去實現點贊功能，下面給大家介紹下基本思路。

基本思路：

進入界面–》獲取數據–》
在Listview中顯示–》
通過map集合（position,boolean）保存每一行是否被點擊–》
利用實體類去保存相應的對象–》
get/set方法進行相應值得改變–》
點擊一次，相應的數量加1

只實現了點贊功能，踩和贊基本類似。

具體實現如下：

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{
//用來獲取界面上的元素
private ViewHolder holder;
private Context context;
//這裡的Bean是個測試用的內部類，將點贊數和踩得數存起來，可以定義一個類，
//直接獲取數據就好，需要改進下
private List<Bean> praise_step_num = new ArrayList<Bean>();
private LayoutInflater inflater;
//保存當前點贊數
List<Map<String,Object>> listItems;
/*
根據position，保存點擊的是哪一行數據，默認為false，點擊後改為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() {
/*
為相應的數據賦值，所有的數據存儲在listItems中
position一一對應每一行數據
*/
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")+"");
/*
每次會復用convertView,
convertView沒有被賦值，就會使用之後賦值的數據，
比如：點擊了第一行數據贊的按鈕，相應的第一行點贊圖片變為紅色
當向下滑動頁面時，下方的也會有一項數據發生變化，復用
在這裡為每次重用賦值
*/
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, "已經點擊過", 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

進行Listview值賦值，然後進行和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","測試","多聯","空氣能","商用","家用","測試","多聯","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);
}
});
}
}

跳轉界面，測試用

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);
}
}

簡單的動畫效果的實現

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

<?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="商用多聯機"
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>

點擊item後進入的界面

<?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，動畫效果就是搬過來的，哈哈，很不錯，學習了

http://www.jb51.net/article/97335.htm

以上所述是小編給大家介紹的Android中Listview點贊功能的實現，希望對大家有所幫助，如果大家有任何疑問歡迎給我留言，小編會及時回復大家的！