muratcangm :
I have a problem to get my list data. I have an data class.
public class MedicineUsageData {
String companyName;
String productName;
String drugSubstance;
String expireDate;
String barcodeNum;
String serialNum;
String partyNum;
String userName;
int userAge;
public MedicineUsageData() {
}
public MedicineUsageData(String companyName, String productName, String drugSubstance, String expireDate, String barcodeNum, String serialNum, String partyNum, String userName, int userAge) {
this.companyName = companyName;
this.productName = productName;
this.drugSubstance = drugSubstance;
this.expireDate = expireDate;
this.barcodeNum = barcodeNum;
this.serialNum = serialNum;
this.partyNum = partyNum;
this.userName = userName;
this.userAge = userAge;
}
public String getCompanyName() {
return companyName;
}
public void setCompanyName(String companyName) {
this.companyName = companyName;
}
public String getProductName() {
return productName;
}
public void setProductName(String productName) {
this.productName = productName;
}
public String getdrugSubstance() {
return drugSubstance;
}
public void setdrugSubstance(String drugSubstance) {
this.drugSubstance = drugSubstance;
}
public String getExpireDate() {
return expireDate;
}
public void setExpireDate(String expireDate) {
this.expireDate = expireDate;
}
public String getBarcodeNum() {
return barcodeNum;
}
public void setBarcodeNum(String barcodeNum) {
this.barcodeNum = barcodeNum;
}
public String getSerialNum() {
return serialNum;
}
public void setSerialNum(String serialNum) {
this.serialNum = serialNum;
}
public String getPartyNum() {
return partyNum;
}
public void setPartyNum(String partyNum) {
this.partyNum = partyNum;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public int getUserAge() {
return userAge;
}
public void setUserAge(int userAge) {
this.userAge = userAge;
}
}
I created a list of this object.
List<MedicineUsageData> medicineUsageDataList = new ArrayList<>();
Then in my button listener I create a JSON file to pass this list to another activity.
String medicineUsageJson = gson.toJson(medicineUsageDataList);
Intent recyclerIntent = new Intent(MainScreenActivity.this,RecyclerViewActivity.class);
recyclerIntent.putExtra("medicineList", medicineUsageJson);
startActivity(recyclerIntent);
Then in other activity I get JSON data and convert it to list again.
medicineList = gson.fromJson(getIntent().getStringExtra("medicineList"), List.class);
Then I call my Adapter and send medicineList.
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MedicineUsageDataViewHolder> {
public static class MedicineUsageDataViewHolder extends RecyclerView.ViewHolder {
CardView cv;
TextView medicineName;
TextView expireDate;
MedicineUsageDataViewHolder(View itemView) {
super(itemView);
cv = (CardView)itemView.findViewById(R.id.MedicineInfo);
medicineName = (TextView)itemView.findViewById(R.id.medicine_name);
expireDate = (TextView)itemView.findViewById(R.id.expire_date);
}
}
List<MedicineUsageData> medicineList;
RecyclerAdapter(List<MedicineUsageData> medicineList){
this.medicineList = medicineList;
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
@Override
public RecyclerAdapter.MedicineUsageDataViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.medicine_usage_data, viewGroup, false);
RecyclerAdapter.MedicineUsageDataViewHolder mvh = new RecyclerAdapter.MedicineUsageDataViewHolder(v);
return mvh;
}
@Override
public void onBindViewHolder(RecyclerAdapter.MedicineUsageDataViewHolder medicineUsageDataViewHolder, int i) {
medicineUsageDataViewHolder.medicineName.setText(medicineList.get(i).getproductName);
medicineUsageDataViewHolder.expireDate.setText(medicineList.get(i).getexpireDate);
//medicineUsageDataViewHolder.medicineName.setText("bug is");
//medicineUsageDataViewHolder.expireDate.setText("here");
}
@Override
public int getItemCount() {
return medicineList.size();
}
}
I try set text of textview with this code.
medicineUsageDataViewHolder.medicineName.setText(medicineList.get(i).getproductName);
medicineUsageDataViewHolder.expireDate.setText(medicineList.get(i).getexpireDate);
But my application crash at this point. If I change this code with this one it works.
//medicineUsageDataViewHolder.medicineName.setText("bug is");
//medicineUsageDataViewHolder.expireDate.setText("here");
So I think my main problem is medicineList.get(i) part. "getproductName" method returns string so it is not a problem. I also try to use toString() method but it didn't fix it either.
I can't see my problem here I tried so many things but I can't see any error. My data comes perfectly , there is no sync problem. I don't know what is the problem is.
Here is my data I checked it in debug mode.
I try to convert list data to String and show it and it works. But it isn't my current wanted situation.
medicineUsageDataViewHolder.medicineName.setText(medicineList.toString());
Here is the result of execute of this line. All of the data are correct. But as I say it isn't my wanted situation. I want to access fields like expireDate etc.
[{barcodeNum=8699570090119, companyName=HÜSNÜ ARSAN İLAÇLARI A.Ş., drugSubstance=parasetamol, psödoefedrin hcl, triprolidin hcl, expireDate=12/21, partyNum=19093004A, productName=A-FERIN SINUS 500/30/1.25 MG FİLM KAPLI TABLET, 20 ADET, serialNum=05000023512631, userAge=25.0, userName=admin}, {barcodeNum=8690570010008, companyName=RECKİTT BENCKİSER TEMİZLİK MALZEMELERİ SAN. TİC. A.Ş., drugSubstance=ibuprofen, psödoefedrin hcl, expireDate=09/19, partyNum=CB284, productName=NUROFEN COLD FLU TABLET, 24 ADET, serialNum=80392202232051, userAge=25.0, userName=admin}]
Could you help me please ?
Here is the stack trace record. I checked it but I can't find issue.
2020-03-12 18:31:01.714 14062-14062/com.track.medicine D/AndroidRuntime: Shutting down VM
2020-03-12 18:31:01.719 14062-14062/com.track.medicine E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.track.medicine, PID: 14062
java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to com.track.medicine.MedicineUsageData
at com.track.medicine.RecyclerAdapter.onBindViewHolder(RecyclerAdapter.java:50)
at com.track.medicine.RecyclerAdapter.onBindViewHolder(RecyclerAdapter.java:14)
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:20854)
at android.view.ViewGroup.layout(ViewGroup.java:6401)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1780)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1546)
at android.view.View.layout(View.java:20854)
at android.view.ViewGroup.layout(ViewGroup.java:6401)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:20854)
at android.view.ViewGroup.layout(ViewGroup.java:6401)
at androidx.appcompat.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:446)
at android.view.View.layout(View.java:20854)
at android.view.ViewGroup.layout(ViewGroup.java:6401)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:20854)
at android.view.ViewGroup.layout(ViewGroup.java:6401)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
at android.view.View.layout(View.java:20854)
at android.view.ViewGroup.layout(ViewGroup.java:6401)
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:945)
at android.view.View.layout(View.java:20854)
at android.view.ViewGroup.layout(ViewGroup.java:6401)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2956)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2643)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1780)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7827)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
at android.view.Choreographer.doCallbacks(Choreographer.java:723)
at android.view.Choreographer.doFrame(Choreographer.java:658)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
2020-03-12 18:31:01.719 14062-14062/com.track.medicine E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Alan Deep :
I can definitely tell that your problem is here:
medicineList = gson.fromJson(getIntent().getStringExtra("medicineList"), List.class);
You are not telling GSON which type it should use. Ok you're telling it to use a List, but a list of What?
Try to pass this instead of List.class
Type type = new TypeToken<List<MedicineUsageData>>(){}.getType();
medicineList = gson.fromJson(getIntent().getStringExtra("medicineList"), type);