我正在尝试在自定义适配器中将文本设置为EditText
,并且得到了以下堆栈:
java.lang.NullPointerException: Attempt to read from field 'android.support.v7.widget.ViewInfoStore android.support.v7.widget.RecyclerView.mViewInfoStore' on a null object reference
at android.support.v7.widget.RecyclerView$LayoutManager.addViewInt(RecyclerView.java:8194)
at android.support.v7.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:8180)
at android.support.v7.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:8168)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1573)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1519)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:614)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3812)
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:3225)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17547)
at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1260)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.widget.ScrollView.onMeasure(ScrollView.java:337)
at android.view.View.measure(View.java:17547)
at android.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java:1676)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:141)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:400)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2615)
at android.view.View.measure(View.java:17547)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2015)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1173)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1379)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:550)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.andro
02-21 14:14:29.702 1707-1707/com.android.inputmethod.latin E/RichInputConnection: Unable to connect to the editor to retrieve text.
02-21 14:14:31.705 1707-1707/com.android.inputmethod.latin E/RichInputConnection: Unable to connect to the editor to retrieve text.
02-21 14:14:33.706 1707-1707/com.android.inputmethod.latin E/RichInputConnection: Unable to connect to the editor to retrieve text.
02-21 14:14:35.709 1707-1707/com.android.inputmethod.latin E/RichInputConnection: Unable to connect to the editor to retrieve text.
我不确定是什么问题,我将文本设置为
TextView
的方式完全相同,而且效果很好。我看过论坛和文章,也看到过类似问题的人,但似乎他们不是将视图与I的ViewHolder
属性正确绑定,还是试图访问这是我的自定义适配器类:
public class ProductListAdapter extends RecyclerView.Adapter<ProductListViewHolder>{
private List<Product> productList;
private ProductItemManager productItemManager;
public ProductListAdapter(List<Product> productList, ProductItemManager productItemManager) {
this.productList = productList;
this.productItemManager = productItemManager;
}
@NonNull
@Override
public ProductListViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View productListView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.adapter_product_list, parent, false);
return new ProductListViewHolder(productListView, productItemManager);
}
@Override
public void onBindViewHolder(@NonNull ProductListViewHolder productListViewHolder, final int position) {
Product product = productList.get(position);
Double finalPrice = product.getSellingPrice() * product.getQuantity();
productListViewHolder.productDescription.setText(product.getDescription());
productListViewHolder.productSellingPrice.setText("un. " + Utils.doubleToReal(product.getSellingPrice()));
productListViewHolder.productFinalPrice.setText(Utils.doubleToReal(finalPrice));
productListViewHolder.productQuantity.setText(Double.toString(product.getQuantity()));
}
@Override
public int getItemCount() {
return productList.size();
}
}
这是我的ViewHolder
public class ProductListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView productDescription, productSellingPrice, productFinalPrice;
public ImageView removeProductIcon;
public EditText productQuantity;
private ProductItemManager productItemManager;
public ProductListViewHolder(View itemView, ProductItemManager productItemManager) {
super(itemView);
productDescription = itemView.findViewById(R.id.productDescription);
productSellingPrice = itemView.findViewById(R.id.productSellingPrice);
productFinalPrice = itemView.findViewById(R.id.productFinalPrice);
removeProductIcon = itemView.findViewById(R.id.removeProductIcon);
productQuantity = itemView.findViewById(R.id.productQuantity);
this.productItemManager = productItemManager;
removeProductIcon.setOnClickListener(this);
this.productChangeListener();
}
private void productChangeListener() {
productQuantity.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Double quantity = Double.parseDouble(productQuantity.getText().toString());
productItemManager.setProductQuantity(getAdapterPosition(), quantity);
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
@Override
public void onClick(View v) {
productItemManager.removeProduct(getAdapterPosition());
}
}
最佳答案
查看绑定后,应调用TextWatch上的侦听器集。用onBindViewHolder
调用您的注册。
......
@Override
public void onBindViewHolder(@NonNull ProductListViewHolder productListViewHolder, final int position) {
......
productListViewHolder.productChangeListener();
....
我还建议使用注册侦听器更改功能。在
RecyclerView
创建期间,如果不创建数百个项目。