我正在尝试在每次点击它时在特定位置更改我的设备的图像资源(点击图片,而不是项目)。我试图将setOnClickListener()放在onBindViewHolder()方法中,但只有最后一项受影响。 here is my recycler view
这是我的适配器:
public class Device_RV_Adapter extends RecyclerView.Adapter<Device_View_Holder> {
List<Device_Data> list= Collections.emptyList();
Context context;
public Device_RV_Adapter(List<Device_Data> list,Context context){
this.list=list;
this.context = context;
}
@Override
public Device_View_Holder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.device_row_layout,parent,false);
Device_View_Holder holder = new Device_View_Holder(v);
return holder;
}
@Override
public void onBindViewHolder(final Device_View_Holder holder, final int position) {
holder.device_id.setText(list.get(position).device_id);
holder.home.setText(list.get(position).home_id);
holder.room.setText(list.get(position).room);
holder.current.setText(list.get(position).current);
holder.switch_key.setImageResource(list.get(position).switch_key);
holder.device.setTag(position);
holder.device.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int pos = (int)v.getTag();
if(list.get(pos).flag==true){
list.get(pos).flag = false;
}
else if(list.get(pos).flag==false){
list.get(pos).flag = true;
}
notifyDataSetChanged();
}
});
if(list.get(position).flag == true)
holder.device.setImageResource(R.drawable.fan_off);
else if(list.get(position).flag==false)
holder.device.setImageResource(R.drawable.fan_on);
}
@Override
public int getItemCount() {
return list.size();
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView){
super.onAttachedToRecyclerView(recyclerView);
}
public void insert(int position,Device_Data device_data){
list.add(position,device_data);
notifyItemInserted(position);
}
public void remove(Device_Data device_data){
int position = list.indexOf(device_data);
list.remove(position);
notifyItemRemoved(position);
}
我的ViewHolder:
public class Device_View_Holder extends RecyclerView.ViewHolder{
CardView cv;
TextView device_id,home,room,current;
public static ImageView device, switch_key;
boolean flag;
public Device_View_Holder(View itemView) {
super(itemView);
cv=(CardView)itemView.findViewById(R.id.device_cv);
device_id=(TextView)itemView.findViewById(R.id.device_id);
home=(TextView)itemView.findViewById(R.id.home_id);
room=(TextView)itemView.findViewById(R.id.room);
current=(TextView)itemView.findViewById(R.id.current);
device=(ImageView)itemView.findViewById(R.id.device_img);
switch_key=(ImageView)itemView.findViewById(R.id.switch_key);
}
我的数据类:
public class Device_Data {
public String device_id,home_id,room,current;
public int device,switch_key;
boolean flag;
public Device_Data(String device_id, String home_id, String room, String current,int device,int switch_key,boolean flag){
this.device_id=device_id;
this.home_id=home_id;
this.room=room;
this.current=current;
this.device=device;
this.switch_key=switch_key;
this.flag=flag;
}
当我点击设备的图像时,如果它处于打开状态(flag = true),则更改为“fan_off”。如果它关闭,请更改为“fan_on”。就像一个开关。任何人都可以帮我解决这个问题吗?提前谢谢......
答案 0 :(得分:0)
首先,onBindViewHolder()
内的循环没有必要,因为这个方法是为列表中的所有项调用的,你不必显式运行循环所有的项目再次。
替换这段代码:
for(int i=0;i<list.size();i++){
if(position==i){
holder.device.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(list.get(position).flag==true)
holder.device.setImageResource(R.drawable.fan_off);
else if(list.get(position).flag==false){
holder.device.setImageResource(R.drawable.fan_on);
}
}
});
}
}
用这个:
// here setTag is used to attach the position with each view being inflated.
holder.device.setTag(position);
holder.device.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int pos = (int)v.getTag();
if(list.get(pos).flag==true){
list.get(pos).flag = false;
}
else{
list.get(pos).flag = true;
}
notifyDataSetChanged();
}
});
if(list.get(position).flag == true)
holder.device.setImageResource(R.drawable.fan_off);
else
holder.device.setImageResource(R.drawable.fan_on);
我们在这里检查标志是真还是假,当用户点击按钮时,相应地更改值,以便在调用notifyDataSetChanged()时,使用新更改的标志值填充视图,从而选择相关视图或未选择的。