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[英]Java Android - Can't use OnClick functions outside of CustomView inside CustomView
[英]CustomView inside RecyclerView
我在 Android 上創建自定義視圖。 我需要將它用作列表視圖的項目。
我的自定義視圖:
public class CustomView extends View{
int random;
//4 constructors;
public int getRandom() {
return random;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
setMeasuredDimension(w, h);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(b, 0,0,new Paint());
drawLetters(new Canvas(b));
}
private void init(){
drawingUtil = DrawingUtil.getInstance(getContext());
random = new Random().nextInt();
}
}
適配器:
public class ListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
List<String> chapter = new ArrayList<>();
Context context;
LayoutInflater inflater;
public ListAdapter(List<String> chapter, Context context) {
this.chapter = chapter;
this.context = context;
this.inflater = LayoutInflater.from(context);
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = inflater.inflate(R.layout.item, null);
return new ChapterHolder(v);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((ChapterHolder) holder).setVerse(chapter.get(position), position);
Log.d(Constants.LOG_TAG, getClass().getSimpleName() + ": random " + ((ChapterHolder) holder).getRandom());
}
@Override
public int getItemCount() {
return chapter.size();
}
}
問題是自定義視圖的內容重復了。 為了測試,我在日志中寫入了一個在自定義視圖類中生成的隨機數。 滾動列表時,該數字會重復,即使我只向下滾動。 我需要做什么才能使每個元素不重復內容?
乍一看,您似乎正在創建一個 ViewHolder(ChapterHolder),但您正在綁定另一個(RecyclerView.ViewHolder)。 在您的適配器聲明中,它應該是:
public class ListAdapter extends RecyclerView.Adapter<ListAdapter.ChapterHolder>
然后你的 onBindViewHolder 實際上將綁定正確的持有人......並且看起來像這樣:
public void onBindViewHolder(ChapterHolder holder, int position) {
holder.setVerse(chapter.get(position), position);
Log.d(Constants.LOG_TAG, getClass().getSimpleName() + ": random " +
holder.getRandom());
}
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