不能使用 dataBinding 从 xml 调用方法 ViewModel

Question

我想开始每隔一秒增加一次计数。当我想使用方法 stopCount() 停止计数器时，我无法在 xml 中通过OnClick调用它。

我收到此错误：

e: [kapt] An exception occurred: android.databinding.tool.util.LoggedErrorException: Found data binding errors.

.

<data>
    <variable name="mainViewModel" type="com.ali.mvvm_livedata.MainViewModel"/>
    <variable name="count" type="String"/>
</data>
<android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">
    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@={mainViewModel.liveData}"
            android:onClick="@{() -> mainViewModel.stopCount()}"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>
    <EditText
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="@={mainViewModel.liveData}"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"/>
</android.support.constraint.ConstraintLayout>

这是我的观点模型

class MainViewModel : ViewModel() {
private val timer = Timer()
private lateinit var timmer: TimerTask
val liveData: MutableLiveData<String> = MutableLiveData()
fun getTime(): MutableLiveData<String> {
    return liveData
}
fun count() {
    var tempCount = 0
    timmer = object : TimerTask() {
        override fun run() {
            tempCount++
            Log.i("currentCount", tempCount.toString())
        }
    }
    timer.scheduleAtFixedRate(timmer, 1000, 1000)
}
internal fun stopCount() {
    timmer.cancel()
}

主活动代码

 @Inject
lateinit var mModelFactory: ViewModelFactory
private lateinit var mainViewModel: MainViewModel
override fun onCreate(savedInstanceState: Bundle?) {
    AndroidInjection.inject(this)
    super.onCreate(savedInstanceState)
    mainViewModel = ViewModelProviders.of(this, mModelFactory).get(MainViewModel::class.java)
    val binding = DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main)
    binding.mainViewModel = mainViewModel
    binding.lifecycleOwner = this
    mainViewModel.count()
}

Answer 1

你必须删除内部(前面的乐趣停止计数(