.onBindViewHolder 的问题（找不到我的代码的解决方案）
[英]Problem with the .onBindViewHolder (Can't find a solution for my code)
问题描述
I know a lot of the posts on this site deal with the.onBindViewHolder but I haven't found the solution to my problem.
我知道这个网站上的很多帖子都与.onBindViewHolder 相关，但我还没有找到解决问题的方法。 The code below is used to display a user's post (text, photos....) but for me it is not displayed and this error appears.下面的代码用于显示用户的帖子（文本、照片......），但对我来说它没有显示，并且出现了这个错误。
Adapter Post转接柱
`public class AdapterPosts extends RecyclerView.Adapter<AdapterPosts.MyHolder> {
Context context;
List<ModelPost> postList;
public AdapterPosts(Context context, List<ModelPost> postList) {
this.context = context;
this.postList = postList;
}
@NonNull
@Override
public MyHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(context).inflate(R.layout.row_posts, viewGroup, false);
return new MyHolder(view);
}
@Override
public void onBindViewHolder(@NonNull MyHolder myHolder, int i) {
String uid = postList.get(i).getUid();
String uEmail = postList.get(i).getuEMail();
String uName = postList.get(i).getuName();
String uDp = postList.get(i).getuDp();
String pId = postList.get(i).getpId();
String pTitle = postList.get(i).getpTitle();
String pDescription = postList.get(i).getpDescr();
String pImage = postList.get(i).getpImage();
String pTimeStamp = postList.get(i).getpTime();
Calendar calendar = Calendar.getInstance(Locale.getDefault());
calendar.setTimeInMillis(Long.parseLong(pTimeStamp));
String pTime = DateFormat.format("dd/MM/yyyy hh:mm aa", calendar).toString();
myHolder.uNameTv.setText(uName);
myHolder.pTimeTv.setText(pTime);
myHolder.pTitleTv.setText(pTitle);
myHolder.pDescriptionTv.setText(pDescription);
try {
Picasso.get().load(uDp).placeholder(R.drawable.ic_default_img).into(myHolder.uPictureIv);
}
catch (Exception e) {
}
if (pImage.equals("noImage")) {
myHolder.pImageIv.setVisibility(View.GONE);
}
else {
try {
Picasso.get().load(pImage).into(myHolder.pImageIv);
}
catch (Exception e) {
}
}
myHolder.moreBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "More", Toast.LENGTH_SHORT).show();
}
});
myHolder.likeBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "Like", Toast.LENGTH_SHORT).show();
}
});
myHolder.commentBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "Commenter", Toast.LENGTH_SHORT).show();
}
});
myHolder.moreBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "Partager", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public int getItemCount() {
return postList.size();
}
class MyHolder extends RecyclerView.ViewHolder{
ImageView uPictureIv, pImageIv;
TextView uNameTv, pTimeTv, pTitleTv, pDescriptionTv, pLikesTv;
ImageButton moreBtn;
Button likeBtn, commentBtn, shareBtn;
public MyHolder(@NonNull View itemView) {
super(itemView);
uPictureIv = itemView.findViewById(R.id.uPictureIv);
pImageIv = itemView.findViewById(R.id.pImageIv);
uNameTv = itemView.findViewById(R.id.uNameTv);
pTimeTv = itemView.findViewById(R.id.pTimeTv);
pTitleTv = itemView.findViewById(R.id.pTitleTv);
pDescriptionTv = itemView.findViewById(R.id.pDescriptionTv);
pLikesTv = itemView.findViewById(R.id.pLikesTv);
moreBtn = itemView.findViewById(R.id.moreBtn);
likeBtn = itemView.findViewById(R.id.likeBtn);
commentBtn = itemView.findViewById(R.id.commentBtn);
shareBtn = itemView.findViewById(R.id.shareBtn);
}
}
}`
Error错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.ascolta, PID: 2215
java.lang.NumberFormatException: null
at java.lang.Long.parseLong(Long.java:557)
at java.lang.Long.parseLong(Long.java:636)
at com.example.ascolta.adapters.AdapterPosts.onBindViewHolder(AdapterPosts.java:57)
at com.example.ascolta.adapters.AdapterPosts.onBindViewHolder(AdapterPosts.java:26)
at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7065)
at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7107)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6012)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6279)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114)
at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2303)
at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1627)
at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587)
at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665)
at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3851)
at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4404)
at android.view.View.layout(View.java:22419)
at android.view.ViewGroup.layout(ViewGroup.java:6584)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:22419)
at android.view.ViewGroup.layout(ViewGroup.java:6584)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:22419)
at android.view.ViewGroup.layout(ViewGroup.java:6584)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)
at android.view.View.layout(View.java:22419)
at android.view.ViewGroup.layout(ViewGroup.java:6584)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:22419)
at android.view.ViewGroup.layout(ViewGroup.java:6584)
at androidx.appcompat.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:530)
at android.view.View.layout(View.java:22419)
at android.view.ViewGroup.layout(ViewGroup.java:6584)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:22419)
at android.view.ViewGroup.layout(ViewGroup.java:6584)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)
at android.view.View.layout(View.java:22419)
at android.view.ViewGroup.layout(ViewGroup.java:6584)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:1041)
at android.view.View.layout(View.java:22419)
at android.view.ViewGroup.layout(ViewGroup.java:6584)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:3378)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2842)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1888)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8511)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:949)
at android.view.Choreographer.doCallbacks(Choreographer.java:761)
at android.view.Choreographer.doFrame(Choreographer.java:696)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:935)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7050)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:965)
Thank you for you precious help Have a nice day感谢您的宝贵帮助祝您有美好的一天
1 个解决方案
解决方案1
0 已采纳 2021-03-24 12:55:19
You must need to check the below code您必须检查以下代码
String pTimeStamp = postList.get(i).getpTime();
Calendar calendar = Calendar.getInstance(Locale.getDefault());
calendar.setTimeInMillis(Long.parseLong(pTimeStamp));
String pTime = DateFormat.format("dd/MM/yyyy hh:mm aa", calendar).toString();
it seems like pTimeStamp is returning the null value and due to that you are getting the NumberFormatException似乎pTimeStamp正在返回 null 值，因此您得到了NumberFormatException
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