使用Epoxy ModelView会导致膨胀错误和NullPoint错误

Question

我正在使用来自@ModelView库的Epoxy注释来创建CustomView。

我引用了另一个例子，但是下面的错误不断出现。

android.view.InflateException: Binary XML file line #2 in com.example.testepoxy:layout/item_custom_view: Binary XML file line #2 in com.example.testepoxy:layout/my_view: Error inflating class com.example.testepoxy.ItemCustomView

Caused by: java.lang.NullPointerException: findViewById(R.id.title) must not be null
        at com.example.testepoxy.ItemCustomView.<init>(ItemCustomView.kt:21)
        at com.example.testepoxy.ItemCustomView.<init>(ItemCustomView.kt:17)
        at com.example.testepoxy.ItemCustomView.<init>(Unknown Source:11)

它不是在使用默认布局时自动膨胀吗？我哪里出错了？

item_custom_view

<?xml version="1.0" encoding="utf-8"?>
<com.example.testepoxy.ItemCustomView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#ff0000">
    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="ewq"/>
</com.example.testepoxy.ItemCustomView>

模型

@ModelView(defaultLayout = R.layout.item_custom_view)
class ItemCustomView @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : FrameLayout(context, attrs, defStyleAttr) {

    val textView: TextView = findViewById(R.id.title)

    @TextProp
    fun setText(title: CharSequence) {
        textView.text = title
    }
}

控制器

class ItemCustomViewController : TypedEpoxyController<List<String>>() {
    private val TAG = this::class.java.simpleName

    override fun buildModels(data: List<String>?) {
        data?.forEachIndexed { index, s ->
           ItemCustomViewModel_()
               .id(index)
               .text(s)
               .addTo(this)
        }
    }
}

Answer 1

使用lazy可以解决您的问题。

val textView: TextView by lazy{
     findViewById(R.id.title)
}

Answer 2

您可以这样做来利用ViewBinding：

R.layout.item_custom_view：

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <androidx.appcompat.widget.AppCompatTextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</merge>

@ModelView(autoLayout = ModelView.Size.MATCH_WIDTH_WRAP_HEIGHT)
class ItemCustomView @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : FrameLayout(context, attrs, defStyleAttr) {
    private val binding = ItemCustomViewBinding.inflate(LayoutInflater.from(context), this)

    // if you need to expose your child view
    val textView: TextView get()= binding.title

    @TextProp
    fun setText(title: CharSequence) {
        // or
        // binding.title.text = title
        textView.text = title
    }}