I'm a complete novice in the Android world. I'm trying to read data from firebase cloud firestore at real time. I have uploaded objects of Tree.java class 4 of whose attributes are Timestamps as can see in the firebase console screenshot and Tree.java class code.
Tree.java
import com.google.firebase.Timestamp;
import java.util.HashMap;
import java.util.Map;
import static com.example.malayishant.greencare.AddTree.DOP;
import static com.example.malayishant.greencare.AddTree.ID;
import static com.example.malayishant.greencare.AddTree.MANURE;
import static com.example.malayishant.greencare.AddTree.WATER;
import static com.example.malayishant.greencare.AddTree.WEED;
public class Tree {
private String id;
private Timestamp dop;
//private GeoPoint geo;
private Timestamp water;
private Timestamp weed;
private Timestamp manure;
public Tree() {
}
public Tree(String id, Timestamp dop, Timestamp water,
Timestamp weed, Timestamp manure) {
this.id = id;
this.dop = dop;
this.water = water;
this.weed = weed;
this.manure = manure;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Timestamp getDop() {
return dop;
}
public void setDop(Timestamp dop) {
this.dop = dop;
}
public Timestamp getWater() {
return water;
}
public void setWater(Timestamp water) {
this.water = water;
}
public Timestamp getWeed() {
return weed;
}
public void setWeed(String name) {
this.weed = weed;
}
public Timestamp getManure() {
return manure;
}
public void setManure(Timestamp manure) {
this.manure = manure;
}
}
The follwing code is used to upload data to cloud fire store.
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.Timestamp;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.FirebaseFirestore;
import java.util.HashMap;
import java.util.Map;
public class AddTree extends AppCompatActivity {
public static final String ID = "id";
public static final String DOP = "dop";
public static final String WATER = "water";
public static final String WEED = "weed";
public static final String MANURE = "manure";
// Access a Cloud Firestore instance from your Activity
FirebaseFirestore db = FirebaseFirestore.getInstance();
private Button mButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_tree);
mButton = findViewById(R.id.buttonAdd);
mButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// your handler code here
uploadTree();
}
});
}
public void uploadTree() {
EditText IdEditText = findViewById(R.id.IdeditText);
String id = IdEditText.getText().toString();
// Timestamp dop = Timestamp.now();
//geo
if (id.isEmpty()) {
return;
}
Map<String, Object> tree = new HashMap<String, Object>();
tree.put(ID, id);
tree.put(DOP, Timestamp.now());
tree.put(WATER, Timestamp.now());
tree.put(WEED, Timestamp.now());
tree.put(MANURE, Timestamp.now());
db.collection("trees")
.add(tree)
.addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
@Override
public void onSuccess(DocumentReference documentReference) {
// Log.d(TAG, "DocumentSnapshot added with ID: " + documentReference.getId());
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.w(TAG, "Error adding document", e);
}
});
}
}
The following code I'm using to get data from the cloud firestore. the runtume error occurring in this code snippet as marked in the code snippet. I'm getting a "java.lang.RuntimeException: Could not deserialize object. Failed to convert value of type java.util.Date to String (found in field 'weed')" when i run the code.
firestoreDB.collection("trees")
.get()
.addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
List<Tree> treeList = new ArrayList<>();
for (DocumentSnapshot doc : task.getResult()) {
Tree tree = doc.toObject(Tree.class);/*this line causing the error*/
treeList.add(tree);
}
mAdapter = new TreeDbAdapter(treeList, getContext(), firestoreDB);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(mAdapter);
} else {
Log.d(TAG, "Error getting documents: ", task.getException());
}
}
});
Errors I'm getting
11-09 20:58:46.182 10665-10665/com.example.malayishant.greencare E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.malayishant.greencare, PID: 10665
java.lang.RuntimeException: Could not deserialize object. Failed to convert value of type java.util.Date to String (found in field 'weed')
at com.google.firebase.firestore.util.CustomClassMapper.deserializeError(com.google.firebase:firebase-firestore@@17.1.2:524)
at com.google.firebase.firestore.util.CustomClassMapper.convertString(com.google.firebase:firebase-firestore@@17.1.2:445)
at com.google.firebase.firestore.util.CustomClassMapper.deserializeToClass(com.google.firebase:firebase-firestore@@17.1.2:217)
at com.google.firebase.firestore.util.CustomClassMapper.deserializeToType(com.google.firebase:firebase-firestore@@17.1.2:180)
at com.google.firebase.firestore.util.CustomClassMapper.access$200(com.google.firebase:firebase-firestore@@17.1.2:53)
at com.google.firebase.firestore.util.CustomClassMapper$BeanMapper.deserialize(com.google.firebase:firebase-firestore@@17.1.2:700)
at com.google.firebase.firestore.util.CustomClassMapper$BeanMapper.deserialize(com.google.firebase:firebase-firestore@@17.1.2:674)
at com.google.firebase.firestore.util.CustomClassMapper.convertBean(com.google.firebase:firebase-firestore@@17.1.2:503)
at com.google.firebase.firestore.util.CustomClassMapper.deserializeToClass(com.google.firebase:firebase-firestore@@17.1.2:242)
at com.google.firebase.firestore.util.CustomClassMapper.convertToCustomClass(com.google.firebase:firebase-firestore@@17.1.2:97)
at com.google.firebase.firestore.DocumentSnapshot.toObject(com.google.firebase:firebase-firestore@@17.1.2:203)
at com.google.firebase.firestore.QueryDocumentSnapshot.toObject(com.google.firebase:firebase-firestore@@17.1.2:121)
at com.google.firebase.firestore.DocumentSnapshot.toObject(com.google.firebase:firebase-firestore@@17.1.2:183)
at com.google.firebase.firestore.QueryDocumentSnapshot.toObject(com.google.firebase:firebase-firestore@@17.1.2:101)
at com.example.malayishant.greencare.FragmentDb$1.onEvent(FragmentDb.java:64)
at com.example.malayishant.greencare.FragmentDb$1.onEvent(FragmentDb.java:52)
at com.google.firebase.firestore.Query.lambda$addSnapshotListenerInternal$2(com.google.firebase:firebase-firestore@@17.1.2:882)
at com.google.firebase.firestore.Query$$Lambda$3.onEvent(com.google.firebase:firebase-firestore@@17.1.2)
at com.google.firebase.firestore.util.ExecutorEventListener.lambda$onEvent$0(com.google.firebase:firebase-firestore@@17.1.2:42)
at com.google.firebase.firestore.util.ExecutorEventListener$$Lambda$1.run(com.google.firebase:firebase-firestore@@17.1.2)
at android.os.Handler.handleCallback(Handler.java:742)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5602)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:774)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)