Android的ViewHolder背景颜色 [英] Android ViewHolder Background Color
问题描述
我创建包含嵌套CardView一个RecyclerView Android应用程序。我需要每隔卡交替到不同的颜色。我使用 @覆盖覆盖 onBindViewHolder（ViewHolder VH，诠释POS）方法。我需要从方法（我假设），改变背景颜色，但有没有方法来设置ViewHolder！的背景颜色
我为我noobie岬对不起，我正在学习Android开发了。
-Ben
编辑：code：
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_9）; pieRecyclerView =（RecyclerView）findViewById（R.id.recyclerView）;
pieRecyclerView.setHasFixedSize（真）;
馅饼= makePies（）; pieLayoutManager =新LinearLayoutManager（本）;
pieRecyclerView.setLayoutManager（pieLayoutManager）;
PieAdapter适配器=新PieAdapter（馅饼）;
pieRecyclerView.setAdapter（适配器）;
}公共类PieAdapter扩展RecyclerView.Adapter＆LT; ViewHolder＆GT; { 上下文mContext;
ArrayList的＆LT;＆馅饼GT; mPies;
LayoutInflater mInflater; 公共PieAdapter（ArrayList的＆LT;＆馅饼GT;馅饼）{ mPies =馅饼; } @覆盖
公共ViewHolder onCreateViewHolder（ViewGroup中的父母，INT viewType）{ 视图V = LayoutInflater.from（parent.getContext（））膨胀（R.layout.card_layout，父母，假的）。
返回新ViewHolder（V）; } @覆盖
公共无效onBindViewHolder（ViewHolder持有人，INT位置）{ 派currentPie = mPies.get（位置）;
holder.textViewName.setText（currentPie.mName）;
holder.textViewDescription.setText（currentPie.mDescription）;
NumberFormat的格式化= NumberFormat.getCurrencyInstance（）;
串价格= formatter.format（currentPie.mPrice）;
holder.textViewPrice.setText（价）; } @覆盖
公众诠释getItemCount（）{ 返回mPies.size（）; }
}私有类ViewHolder扩展RecyclerView.ViewHolder { 公众的TextView textViewName;
公众的TextView textViewDescription;
公众的TextView textViewPrice; 公共ViewHolder（视图v）{ 超级（五）;
textViewName =（TextView中）v.findViewById（R.id.textViewName）;
textViewDescription =（TextView中）v.findViewById（R.id.textViewDescription）;
textViewPrice =（TextView中）v.findViewById（R.id.textViewPrice）; }
}私人的ArrayList＆LT;＆馅饼GT; makePies（）{ ArrayList的＆LT;＆馅饼GT;馅饼=新的ArrayList＆LT;＆馅饼GT;（）;
pies.add（新派（苹果，一个老fashoned的最爱。，1.5））;
pies.add（新派（蓝莓，使用新鲜蓝莓缅因州，1.5））;
pies.add（新派（樱桃，美味和每日新鲜制造，2.0））;
pies.add（新派（椰奶油，顾客的喜爱。2.5））;
返回馅饼;}私有类馅饼{ 字符串MNAME;
串mDescription;
双mPrice; 公共饼（字符串名称，字符串描述，双价）{ this.mName =名称;
this.mDescription =描述;
this.mPrice =价格; }
}`
的 ViewHolder 对象本身不是查看。如果你想改变整个列表项的背景，你可能想调用 viewHolder.itemView.setBackgroundColor（...）。在 ItemView控件的 ViewHolder 是什么查看传递进构造函数。
I am creating an Android application that contains a RecyclerView with a nested CardView. I need to alternate every other Card to a different color. I am using @Override to override the onBindViewHolder(ViewHolder vh, int pos) method. I need to change the background color from that method (I assume), but there are no methods to set the background color of a ViewHolder!
I'm sorry for my noobie-ness, I'm learning Android development now.
-Ben
EDIT: Code:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_9);
pieRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
pieRecyclerView.setHasFixedSize(true);
pies = makePies();
pieLayoutManager = new LinearLayoutManager(this);
pieRecyclerView.setLayoutManager(pieLayoutManager);
PieAdapter adapter = new PieAdapter(pies);
pieRecyclerView.setAdapter(adapter);
}
public class PieAdapter extends RecyclerView.Adapter<ViewHolder> {
Context mContext;
ArrayList<Pie> mPies;
LayoutInflater mInflater;
public PieAdapter(ArrayList<Pie> pies) {
mPies = pies;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout, parent, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Pie currentPie = mPies.get(position);
holder.textViewName.setText(currentPie.mName);
holder.textViewDescription.setText(currentPie.mDescription);
NumberFormat formatter = NumberFormat.getCurrencyInstance();
String price = formatter.format(currentPie.mPrice);
holder.textViewPrice.setText(price);
}
@Override
public int getItemCount() {
return mPies.size();
}
}
private class ViewHolder extends RecyclerView.ViewHolder {
public TextView textViewName;
public TextView textViewDescription;
public TextView textViewPrice;
public ViewHolder(View v) {
super(v);
textViewName = (TextView) v.findViewById(R.id.textViewName);
textViewDescription = (TextView) v.findViewById(R.id.textViewDescription);
textViewPrice = (TextView) v.findViewById(R.id.textViewPrice);
}
}
private ArrayList<Pie> makePies() {
ArrayList<Pie> pies = new ArrayList<Pie>();
pies.add(new Pie("Apple", "An old-fashoned favorite.", 1.5));
pies.add(new Pie("Blueberry", "Made with fresh Maine blueberries.", 1.5));
pies.add(new Pie("Cherry", "Delicious and fresh made daily", 2.0));
pies.add(new Pie("Coconut Cream", "A customer favorite.", 2.5));
return pies;
}
private class Pie {
String mName;
String mDescription;
double mPrice;
public Pie(String name, String description, double price) {
this.mName = name;
this.mDescription = description;
this.mPrice = price;
}
}`
The ViewHolder object is not itself a View. If you want to change the background of the entire list item, you probably want to call viewHolder.itemView.setBackgroundColor(...). The itemView of a ViewHolder is whatever View you passed into the constructor.
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