我有一个Recyclerview适配器，它基于两种不同的卡布局。该适配器使用新卡动态更新，因此适配器中的每个卡也需要更新。对于每张卡片，都有一个显示随机生成数据的进度条。
然而，我面临的问题是，当我删除列表中的一张卡片时，删除的卡片的参考不会被删除（onCreateViewHolder未被调用，因此不会更新视图），而是留下的卡片是只需写下＆＃34;删除＆＃34;的布局卡。卡上的文字是正确的，它从列表中删除了正确的项目，但进度条仍然具有旧卡的旧参考，这使得它添加了与删除的卡相对应的值。
为了说明问题，我根据移动名称将随机数据添加到进度条中的每张卡片上。因此无论卡片如何，名为＆＃34; Open Hand＆＃34;应始终在0-20之间添加随机数据，＆＃34;关闭手＆＃34; 20-60＆＃34;和＆＃34;代词＆＃34; 60-100＆＃34;
添加三张卡后，这里的一切正常运作： After inserted three cards
但是当我删除两张第一张牌时＃34;打开手牌＆＃34; ＆＃34;关闭手＆＃34;，＆＃34;旋转＆＃34;卡片左侧显示正在进行中的数据栏实际上对应于＆＃34;打开手牌＆＃34;数据范围。那么为什么引用不正确呢？ 我试过调用onDataSetChange（）;和notifyItemRemoved（pos）; After deleted two cards
我的适配器代码：
public class ParameterAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
List<Movement> movements;
public ParameterAdapter() {
this.movements=movementList;
}
class AddCard extends RecyclerView.ViewHolder {
public AddCard(View inflate) {
super(inflate);
}
}
class Card extends RecyclerView.ViewHolder {
TextView movement;
TextView channel;
TextView remove;
ProgressBar strength;
TextView graph;
LinearLayout expandedView;
LineChart lineChart;
Movement mov;
public Card(View itemView, Movement m) {
super(itemView);
movement = (TextView) itemView.findViewById(R.id.movementText);
channel = (TextView) itemView.findViewById(R.id.channelNameText);
remove = (TextView) itemView.findViewById(R.id.removeCard);
strength = (ProgressBar) itemView.findViewById(R.id.progressBarStrength);
graph = (TextView) itemView.findViewById(R.id.graphTextButton);
expandedView = (LinearLayout) itemView.findViewById(R.id.detailsNr2);
lineChart = (LineChart) itemView.findViewById(R.id.linechartCard);
mov=m;
channel.setText(m.getChannel());
//Setup real time graph
setupLineChart(mov, lineChart, mov.getId());
// Start adding random data to the graph
startAddingRandomData();
}
public void startAddingRandomData() {
new Thread(
new Runnable() {
public void run() {
while (true) {
int generatedData;
// Depending on what type of movement, add slightly different generated random data
// (to be sure that the views are correctly updated when removed for instance)
if(mov.getSettingsType().equals(SettingsDbHelper.MOVEMENTS_STRING[0])){
// Add random generated data between the span 0-20
generatedData=generateRandomData(0,20);
} else if (mov.getSettingsType().equals(SettingsDbHelper.MOVEMENTS_STRING[1])) {
// Add random generated data between the span 20-60
generatedData=generateRandomData(20, 60);
} else {
// Add random generated data between the span 60-100
generatedData=generateRandomData(60, 100);
}
//Set the progress bar
strength.setProgress(generatedData);
// Add the random generated data to the graph
addEntry(mov, lineChart, generatedData);
try {
Thread.sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
}
}
public int generateRandomData(int n1, int n2){
Random r = new Random();
return r.nextInt(n2 - n1) + n1;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View vSetting=null;
View vCard=null;
// If its the first position, then inflate the "add movement" card.
if(viewType==0) {
vSetting = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_parameter_cardview, parent, false);
return new AddCard(vSetting);
}else if(viewType>0) {
// Otherwise, if it's not the first position, then inflate a "movement card" and create the corresponding movement item
vCard = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview_movement, parent, false);
Movement m = movementList.get(viewType - 1);
return new Card(vCard, m);
}else {
// For some reason, this occurs
return null;
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder,final int position) {
// "Add movement" card
if(position==0){
((AddCard)holder).itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), AddMovement.class);
startActivityForResult(intent, ADD_MOVEMENT);
}
});
// "Movement" item card
} else if(position>0) {
final boolean isExpanded = position == mExpandedPosition;
((Card) holder).expandedView.setVisibility(isExpanded ? View.VISIBLE : View.GONE);
((Card) holder).graph.setActivated(isExpanded);
((Card) holder).graph.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mExpandedPosition = isExpanded ? -1 : position;
notifyDataSetChanged();
}
});
// Get the type of movement
Movement m = movementList.get(position - 1);
// This lets the real-time graph view be created before actual adding any data.
m.setChartCreated(1);
//Update the textviews inside the card
((Card)holder).movement.setText(m.getMovement());
((Card)holder).channel.setText(m.getChannel());
((Card)holder).remove.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Movement m = movementList.get(position - 1);
//Remove the item from the list
remove(m);
// Get ID and settings type in order to update the entry
String id=m.getId();
String settingsType = m.getSettingsType();
//Update the entry
settingsdb.updateSetting(settingsType,id,"false");
}
});
}
}
// Remove item from the list
public void remove(Movement data) {
int position = movementList.indexOf(data);
movementList.remove(data);
notifyDataSetChanged();
// (+ 1 one to compensate for the first card)
notifyItemRemoved(position + 1);
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
@Override
public int getItemViewType(int position) {
//Return the position
return position;
}
@Override
public int getItemCount() {
// (+1 to compensate for the first card)
return movementList.size()+1;
}
}