অনেক লড়াইয়ের পরেও আমি এটি সমাধান করতে পেরেছি। এমএমভিএম আর্কিটেকচার ব্যবহার করে আমার সমাধানটি এখানে দেওয়া হয়েছে :
Student.kt
@Entity(tableName = "students")
data class Student(
@NotNull var name: String,
@NotNull var password: String,
var subject: String,
var email: String
) {
@PrimaryKey(autoGenerate = true)
var roll: Int = 0
}
StudentDao.kt
interface StudentDao {
@Insert
fun insertStudent(student: Student) : Long
}
StudentRepository.kt
class StudentRepository private constructor(private val studentDao: StudentDao)
{
fun getStudents() = studentDao.getStudents()
fun insertStudent(student: Student): Single<Long>? {
return Single.fromCallable(
Callable<Long> { studentDao.insertStudent(student) }
)
}
companion object {
// For Singleton instantiation
@Volatile private var instance: StudentRepository? = null
fun getInstance(studentDao: StudentDao) =
instance ?: synchronized(this) {
instance ?: StudentRepository(studentDao).also { instance = it }
}
}
}
StudentViewModel.kt
class StudentViewModel (application: Application) : AndroidViewModel(application) {
var status = MutableLiveData<Boolean?>()
private var repository: StudentRepository = StudentRepository.getInstance( AppDatabase.getInstance(application).studentDao())
private val disposable = CompositeDisposable()
fun insertStudent(student: Student) {
disposable.add(
repository.insertStudent(student)
?.subscribeOn(Schedulers.newThread())
?.observeOn(AndroidSchedulers.mainThread())
?.subscribeWith(object : DisposableSingleObserver<Long>() {
override fun onSuccess(newReturnId: Long?) {
Log.d("ViewModel Insert", newReturnId.toString())
status.postValue(true)
}
override fun onError(e: Throwable?) {
status.postValue(false)
}
})
)
}
}
খণ্ডে:
class RegistrationFragment : Fragment() {
private lateinit var dataBinding : FragmentRegistrationBinding
private val viewModel: StudentViewModel by viewModels()
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
initialiseStudent()
viewModel.status.observe(viewLifecycleOwner, Observer { status ->
status?.let {
if(it){
Toast.makeText(context , "Data Inserted Sucessfully" , Toast.LENGTH_LONG).show()
val action = RegistrationFragmentDirections.actionRegistrationFragmentToLoginFragment()
Navigation.findNavController(view).navigate(action)
} else
Toast.makeText(context , "Something went wrong" , Toast.LENGTH_LONG).show()
//Reset status value at first to prevent multitriggering
//and to be available to trigger action again
viewModel.status.value = null
//Display Toast or snackbar
}
})
}
fun initialiseStudent() {
var student = Student(name =dataBinding.edName.text.toString(),
password= dataBinding.edPassword.text.toString(),
subject = "",
email = dataBinding.edEmail.text.toString())
dataBinding.viewmodel = viewModel
dataBinding.student = student
}
}
আমি ডেটাবাইন্ডিং ব্যবহার করেছি e এখানে আমার এক্সএমএল:
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="student"
type="com.kgandroid.studentsubject.data.Student" />
<variable
name="listener"
type="com.kgandroid.studentsubject.view.RegistrationClickListener" />
<variable
name="viewmodel"
type="com.kgandroid.studentsubject.viewmodel.StudentViewModel" />
</data>
<androidx.core.widget.NestedScrollView
android:id="@+id/nestedScrollview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
tools:context="com.kgandroid.studentsubject.view.RegistrationFragment">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/constarintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:isScrollContainer="true">
<TextView
android:id="@+id/tvRoll"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
android:gravity="center_horizontal"
android:text="Roll : 1"
android:textColor="@color/colorPrimary"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/edName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:layout_marginEnd="16dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tvRoll" />
<TextView
android:id="@+id/tvName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:text="Name:"
android:textColor="@color/colorPrimary"
android:textSize="18sp"
app:layout_constraintBaseline_toBaselineOf="@+id/edName"
app:layout_constraintEnd_toStartOf="@+id/edName"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="@+id/tvEmail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Email"
android:textColor="@color/colorPrimary"
android:textSize="18sp"
app:layout_constraintBaseline_toBaselineOf="@+id/edEmail"
app:layout_constraintEnd_toStartOf="@+id/edEmail"
app:layout_constraintStart_toStartOf="parent" />
<EditText
android:id="@+id/edEmail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:layout_marginEnd="16dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/edName" />
<TextView
android:id="@+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Password"
android:textColor="@color/colorPrimary"
android:textSize="18sp"
app:layout_constraintBaseline_toBaselineOf="@+id/edPassword"
app:layout_constraintEnd_toStartOf="@+id/edPassword"
app:layout_constraintStart_toStartOf="parent" />
<EditText
android:id="@+id/edPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:layout_marginEnd="16dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/edEmail" />
<Button
android:id="@+id/button"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="24dp"
android:layout_marginEnd="32dp"
android:background="@color/colorPrimary"
android:text="REGISTER"
android:onClick="@{() -> viewmodel.insertStudent(student)}"
android:textColor="@android:color/background_light"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/edPassword" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
</layout>
রুম সন্নিবেশ এবং মুছে ফেলা অপারেশনটি আলাদা থ্রেডে করতে হবে বলে আমি এ্যাসিনটাস্ক দিয়ে এটি সম্পাদন করতে অনেক সংগ্রাম করেছি। শেষ পর্যন্ত
আরএক্সজেবাতে একক প্রকারের পর্যবেক্ষণযোগ্য এর সাহায্যে এটি করতে সক্ষম।
Rxjava এর জন্য গ্রেডল নির্ভরতা:
implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
implementation 'io.reactivex.rxjava2:rxjava:2.0.3'
intবাlongপরিবর্তে চেষ্টা করেছেন ?void@Insert