E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.navigation, PID: 2579
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference
at com.example.navigation.camera$2$1.onDataChange(camera.java:222)
at com.google.firebase.database.core.ValueEventRegistration.fireEvent(com.google.firebase:firebase-database@@19.2.1:75)
at com.google.firebase.database.core.view.DataEvent.fire(com.google.firebase:firebase-database@@19.2.1:63)
at com.google.firebase.database.core.view.EventRaiser$1.run(com.google.firebase:firebase-database@@19.2.1:55)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:192)
at android.app.ActivityThread.main(ActivityThread.java:6748)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:875)
java .lang.NullPointerException: попытка вызвать виртуальный метод 'java .lang.String java .lang.Object.toString ()' для ссылки на пустой объект в com. example.navigation.camera $ 2 $ 1.onDataChange (camera. java: 222)
Может кто-нибудь решить эту ошибку
DatabaseReference reff = FirebaseDatabase.getInstance().getReference();
description_info = findViewById(R.id.description_info);
planting_time_info = findViewById(R.id.planting_time_info);
bloom_time_info = findViewById(R.id.bloom_time_info);
Hardiness_info = findViewById(R.id.Hardiness_info);
moredetails = findViewById(R.id.moredetails);
moredetails.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String Tea = "Tea";
String Cotton = "Cotton";
if (Tea.equals(label1.getText().toString())) {
reference = reff.child("CropName").child("Tea");
}else if (Cotton.equals(label1.getText().toString())){
reference = reff.child("CropName").child("Cotton");
}
reff.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
String description = dataSnapshot.child("description").getValue().toString().trim();
String planting_time = dataSnapshot.child("planting_time").getValue().toString().trim();
String bloom_time = dataSnapshot.child("bloom_time").getValue().toString().trim();
String hardiness = dataSnapshot.child("hardiness").getValue().toString().trim();
description_info.setText(description);
planting_time_info.setText(planting_time);
bloom_time_info.setText(bloom_time);
Hardiness_info.setText(hardiness);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
});