在我的应用中，我在标签listview中有一个fragment。 listview的每一行都是cardview，其中包含多个视图。（Buttons，textviews等。）我创建了一个自定义adapter类这个listview。
此adapter类从本地数据库获取数据并将其插入views中的不同cardview，从而创建卡片列表。我在cardview中有一个类似的按钮。
现在，当用户按下like按钮时，我正在使用适配器类中的onClickListener按钮更改按钮的背景。
问题是，如果我按下一张卡上的按钮，它将改变该卡上的类似按钮的背景以及列表中的第四张卡上的按钮。我认为这必须与我正在使用的ViewHolder模式做一些事情，但不确定如何解决它。
这是自定义适配器类
package com.example.nxtstepz.nxtstepzone.Adpters;
import android.content.Context;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;
import com.example.nxtstepz.nxtstepzone.Communicater.Communicater;
import com.example.nxtstepz.nxtstepzone.PostDetailActivity;
import com.example.nxtstepz.nxtstepzone.PostInfo;
import com.example.nxtstepz.nxtstepzone.R;
import java.util.List;
import de.greenrobot.dao.query.QueryBuilder;
import nxtstepz.DaoMaster;
import nxtstepz.DaoSession;
import nxtstepz.Post;
import nxtstepz.PostDao;
import nxtstepz.SavedPost;
import nxtstepz.SavedPostDao;
/**
* Created by Prathya on 6/8/2015.
*/
public class HomeScreenNewsFeedAdapter extends ArrayAdapter<PostInfo>{
List<PostInfo> data;
Context context;
int layoutid;
public HomeScreenNewsFeedAdapter(Context context, int layoutid, List<PostInfo> data) {
super(context, layoutid);
this.context=context;
this.data=data;
this.layoutid=layoutid;
}
@Override
public int getCount() {
return data.size();
}
@Override
public long getItemId(int position) {
return 0;
}
private class PostHolder{
TextView postusername,autherinstitute,postheading,postdescription,likecount,comments,date,category;
View save,like;
LinearLayout postdetail;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(context,"nxtstepz",null);
SQLiteDatabase db =helper.getWritableDatabase();
DaoMaster daoMaster = new DaoMaster(db);
DaoSession session = daoMaster.newSession();
final PostDao postDao = session.getPostDao();
final PostHolder holder;
View v= convertView;
if(v==null){
LayoutInflater li = LayoutInflater.from(context);
v= li.inflate(layoutid,parent,false);
holder = new PostHolder();
holder.postusername = (TextView)v.findViewById(R.id.postusername);
holder.autherinstitute= (TextView)v.findViewById(R.id.autherinstitute);
holder.postheading = (TextView)v.findViewById(R.id.post_title);
holder.postdescription = (TextView)v.findViewById(R.id.post_description);
holder.likecount = (TextView)v.findViewById(R.id.like_count);
holder.comments = (TextView)v.findViewById(R.id.comment_count);
holder.date = (TextView)v.findViewById(R.id.post_datetime);
holder.category = (TextView)v.findViewById(R.id.post_category);
holder.save=v.findViewById(R.id.save_button);
holder.like= v.findViewById(R.id.like_button);
holder.postdetail=(LinearLayout)v.findViewById(R.id.ll3);
v.setTag(holder);
}
else {
holder= (PostHolder)v.getTag();
}
final PostInfo post;
post = data.get(position);
Log.d("post id", String.valueOf(post.posttypeid));
holder.postusername.setText(post.postusername);
holder.autherinstitute.setText(post.autherinstitutename);
holder.postheading.setText(post.postheading);
holder.postdescription.setText(post.postdescription);
holder.likecount.setText(""+post.likecount);
holder.comments.setText("" + post.comments);
holder.category.setText(post.categoryname);
holder.date.setText(post.date);
holder.like.setOnClickListener(new View.OnClickListener() { //this method has the problem
@Override
public void onClick(View v) {
if (post.postlikeflag == 0) {
holder.like.setBackgroundResource(R.drawable.liked);
post.postlikeflag =1;
} else {
holder.like.setBackgroundResource(R.drawable.like);
post.postlikeflag = 0;
}
}
});
holder.postdetail.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent eventDetail = new Intent(context, PostDetailActivity.class);
eventDetail.putExtra("EventDetail", post);
context.startActivity(eventDetail);
}
});
return v;
}
}
这是single_card_view.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#BDBDBD">
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/homecardview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
card_view:cardCornerRadius="4dp"
card_view:cardElevation="4dp">
<LinearLayout
android:id="@+id/ll2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="@+id/imgIcon"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:layout_margin="10dp"
android:src="@drawable/img8" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginTop="10dp"
android:gravity="left"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/postusername"
android:gravity="left"
android:text="Jessica Alba"
android:textSize="18sp"
android:textStyle="bold" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="left"
android:id="@+id/autherinstitute"
android:text="Mahatma audkjfsdk dkbldvb"
android:singleLine="true"
android:ellipsize="end"
android:textSize="13sp"
android:textStyle="italic"
android:scrollHorizontally="true"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="10dp"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top|right"
android:layout_marginRight="10dp"
android:text="38 min"
android:id="@+id/post_datetime"/>
<TextView
android:id="@+id/post_category"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_marginTop="10dp"
android:background="#9C27B0"
android:padding="5dp"
android:text=""
android:textColor="#ffffff"
android:textStyle="bold|italic" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/ll3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/post_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#00b5ad"
android:gravity="center|left"
android:padding="5dp"
android:text="Sri-Ram breakup party"
android:textColor="#ffffff"
android:textSize="15dp"
/>
<TextView
android:id="@+id/post_description"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginTop="1dp"
android:background="#ffffff"
android:gravity="top|left"
android:padding="5dp"
android:text="Monica is an Italian actress and model who recently broke up with Sriram started her modelling career at the age of 13 by posing for a local photo enthusiast. Android:The Best OS.Android powers hundreds of millions of mobile devices in more than 190 countries around the world.Android's openness has made it a favorite for consumers"
android:textSize="10dp" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_margin="2dp"
android:background="#000000"></View>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dp">
<View
android:id="@+id/like_button"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_marginLeft="10dp"
android:background="@drawable/like"
android:focusable="false"
android:focusableInTouchMode="false">
</View>
<View
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:background="@drawable/comment"
android:id="@+id/comment_button"></View>
<View
android:layout_width="45dp"
android:layout_height="30dp"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/view"
android:id="@+id/save_button"
android:background="@drawable/save"></View>
<TextView
android:layout_width="wrap_content"
android:layout_height="40dp"
android:padding="6dp"
android:text="0"
android:gravity="center"
android:id="@+id/like_count"
android:background="#FFECB3"
android:layout_alignTop="@+id/like_button"
android:layout_toRightOf="@+id/like_button"
android:layout_toEndOf="@+id/like_button"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="40dp"
android:padding="6dp"
android:text="0"
android:gravity="center"
android:id="@+id/comment_count"
android:background="#FFECB3"
android:layout_gravity="center_horizontal|bottom"
android:layout_alignTop="@+id/comment_button"
android:layout_toRightOf="@+id/comment_button"
android:layout_toEndOf="@+id/comment_button" />
</RelativeLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
答案 0 :(得分：1)
我修改了你的代码粘贴它并检查它是否正常工作
@Override
public View getView(int position, View convertView, ViewGroup parent) {
DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(context,"nxtstepz",null);
HashMap<Integer, String> map = new HashMap<Integer, String>();
SQLiteDatabase db =helper.getWritableDatabase();
DaoMaster daoMaster = new DaoMaster(db);
DaoSession session = daoMaster.newSession();
final PostDao postDao = session.getPostDao();
final PostHolder holder;
View v= convertView;
if(v==null){
LayoutInflater li = LayoutInflater.from(context);
v= li.inflate(layoutid,parent,false);
holder = new PostHolder();
holder.postusername = (TextView)v.findViewById(R.id.postusername);
holder.autherinstitute= (TextView)v.findViewById(R.id.autherinstitute);
holder.postheading = (TextView)v.findViewById(R.id.post_title);
holder.postdescription = (TextView)v.findViewById(R.id.post_description);
holder.likecount = (TextView)v.findViewById(R.id.like_count);
holder.comments = (TextView)v.findViewById(R.id.comment_count);
holder.date = (TextView)v.findViewById(R.id.post_datetime);
holder.category = (TextView)v.findViewById(R.id.post_category);
holder.save=v.findViewById(R.id.save_button);
holder.like= v.findViewById(R.id.like_button);
holder.postdetail=(LinearLayout)v.findViewById(R.id.ll3);
v.setTag(holder);
}
else {
holder= (PostHolder)v.getTag();
}
final PostInfo post;
post = data.get(position);
Log.d("post id", String.valueOf(post.posttypeid));
holder.postusername.setText(post.postusername);
holder.autherinstitute.setText(post.autherinstitutename);
holder.postheading.setText(post.postheading);
holder.postdescription.setText(post.postdescription);
holder.likecount.setText(""+post.likecount);
holder.comments.setText("" + post.comments);
holder.category.setText(post.categoryname);
holder.date.setText(post.date);
map.put(position,"like");
holder.like.setOnClickListener(new View.OnClickListener() { //this method has the problem
@Override
public void onClick(View v) {
if (post.postlikeflag == 0 && map.get(position).equals("like")) {
holder.like.setBackgroundResource(R.drawable.liked);
map.put(position,"liked");
post.postlikeflag =1;
} else {
holder.like.setBackgroundResource(R.drawable.like);
post.postlikeflag = 0;
}
}
});
holder.postdetail.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent eventDetail = new Intent(context, PostDetailActivity.class);
eventDetail.putExtra("EventDetail", post);
context.startActivity(eventDetail);
}
});
答案 1 :(得分：0)
在你的按钮和其他视图中，onClick监听器在那里添加这两行xml
android:focusable="false"
android:focusableInTouchMode="false"
如下所示声明最终变量索引，并在非常位置初始化它 getView方法的开始如下
final int index = position;
同时点击而非此
post.postlikeflag =1;
试试这个
data.get(index).postlikeflag = 1;
您还必须调用notifyDataSetChanged（）
答案 2 :(得分：0)
我通过SAM建议使用HashMap来实现它。 这就是我所做的。
适配器类中的
HashMap<Long, String> map = new HashMap<Long, String>();
getView() 的adapter方法中的
if(post.postlikeflag==0){
map.put(post.postid, "like");
}
else{
map.put(post.postid,"liked");
}
if(map.get(post.postid).equals("like")) {
holder.like.setBackgroundResource(R.drawable.like);
}
else {
holder.like.setBackgroundResource(R.drawable.liked);
}
在onclickListener之类的按钮
if (post.postlikeflag == 0 && map.get(post.postid).equals("like")) {
holder.like.setBackgroundResource(R.drawable.liked);
map.put(post.postid, "liked");
post.postlikeflag = 1;
} else {
holder.like.setBackgroundResource(R.drawable.like);
post.postlikeflag = 0;
map.put(post.postid,"like");
}
我知道代码中可能存在一些冗余。如果你发现，请指出。