我正在使用卡片视图开发应用程序。但是我无法获得textview id。我使用recyclerview适配器。我将carview充气。卡片视图包含我需要的文本。所有其他{ {1}}工作正常。所以我得到textViews
This is the image when debugging。我的null pointer Exception适配器类
recyclerview我的cardview xml
public class RecyclerViewAdapterbrands extends RecyclerView
.Adapter<RecyclerViewAdapterbrands
.DataObjectHolder> {
private static String LOG_TAG = "MyRecyclerViewAdapter";
private ArrayList<DataObject> mDataset;
private static MyClickListener myClickListenerhi;
private String headline;
private String reporterName;
private String date;
private String url;
private Activity activityContext;
//private static MyClickListener myClickListener;
public static class DataObjectHolder extends RecyclerView.ViewHolder implements View.OnClickListener
{
TextView label,price,disctext;
ImageView imageView;
ImageView discount;
ProgressBar progressBar;
public DataObjectHolder(final View itemView, final Context activity, final ArrayList<DataObject> myDataset) {
super(itemView);
label = (TextView) itemView.findViewById(R.id.textView);
price= (TextView) itemView.findViewById(R.id.price);
imageView=(ImageView)itemView.findViewById(R.id.iproductimg);
discount=(ImageView)itemView.findViewById(R.id.discimg);
disctext=(TextView) itemView.findViewById(R.id.discounttxt);//here not getting the id
progressBar=(ProgressBar)itemView.findViewById(R.id.progress);
Log.i(LOG_TAG, "Adding Listener");
itemView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
myClickListenerhi.onItemClick(getLayoutPosition(),v);
}
}
public RecyclerViewAdapterbrands(Activity context, ArrayList<DataObject> myDataset, MyClickListener myClickListener1) {
mDataset = myDataset;
activityContext=context;
myClickListenerhi=myClickListener1;
}
@Override
public DataObjectHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.cardview, parent, false);
DataObjectHolder dataObjectHolder = new DataObjectHolder(view,activityContext,mDataset);
return dataObjectHolder;
}
@Override
public void onBindViewHolder(final DataObjectHolder holder, int position) {
Context context=null;
holder.label.setText(mDataset.get(position).getmText1());
holder.price.setText(String.format("Price:%s", mDataset.get(position).getPrice()));
// holder.dateTime.setText(mDataset.get(position).getmText2());
Drawable placeholder = holder.imageView.getContext().getResources().getDrawable(R.drawable.placeholder);
holder.imageView.setImageDrawable(placeholder);
if(Double.parseDouble(mDataset.get(position).getDisc())>0){
holder.discount.setVisibility(View.VISIBLE);
holder.disctext.setVisibility(View.VISIBLE);
holder.disctext.setText(mDataset.get(position).getDisc());
}
//new ImageDownloaderTask(holder.imageView).execute(mDataset.get(position).getUrl());
mDataset.get(position).setPosition(position);
Picasso.with(activityContext)
.load(mDataset.get(position).getUrl())
.placeholder(R.drawable.placeholder)
.into(holder.imageView, new Callback() {
@Override
public void onSuccess() {
holder.progressBar.setVisibility(View.INVISIBLE);
}
@Override
public void onError() {
}
});
}
public void addItem(DataObject dataObj, int index) {
mDataset.add(index, dataObj);
notifyItemInserted(index);
}
public void deleteItem(int index) {
mDataset.remove(index);
notifyItemRemoved(index);
}
@Override
public int getItemCount() {
return mDataset.size();
}
public interface MyClickListener {
void onItemClick(int position, View v);
}
}
我的日志猫
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:weightSum="3"
>
<android.support.v7.widget.CardView
android:id="@+id/card_view"
android:layout_width="156dp"
android:layout_height="274dp"
android:layout_margin="5dp"
card_view:cardCornerRadius="2dp"
card_view:contentPadding="5dp"
card_view:cardBackgroundColor="#ffffff">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:layout_width="wrap_content"
android:layout_height="200dp"
android:id="@+id/iproductimg"
android:src="@drawable/placeholder"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:scaleType="fitXY"
android:layout_alignBottom="@+id/progress" />
<ProgressBar
android:id="@+id/progress"
style="?android:attr/progressBarStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:visibility="visible"
android:indeterminate="false" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
android:layout_above="@+id/price"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:id="@+id/price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/discimg"
android:src="@drawable/disc"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:visibility="invisible" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="-15%"
android:id="@+id/discounttxt" //this is the textview id ineeded
android:textIsSelectable="false"
android:textSize="10sp"
android:layout_marginLeft="8dp"
android:layout_marginStart="8dp"
android:layout_alignBottom="@+id/discimg"
android:layout_alignLeft="@+id/discimg"
android:layout_alignStart="@+id/discimg"
android:layout_marginBottom="13dp"
android:visibility="invisible" />
</RelativeLayout>
</android.support.v7.widget.CardView>