У меня есть пользовательское представление, использующее kotlin android extension, чтобы найти вспомогательное представление, все хорошо работает на реальном устройстве и виртуальном устройстве.При использовании пользовательского представления в Android Sutdio Layout preview бросить java.lang.NullPointerException
очистить и перестроить сделали много раз
Студия Android: 3.2.1
kotlin: 1.2.50-71
Но тот же код работает должным образом на Android Studio 3.1.4
Это не простая проблема NPE, это может вызвать Android Studio Layout Preview
Пользовательский вид :
import android.content.Context
import android.util.AttributeSet
import android.view.View
import android.widget.RelativeLayout
import com.youzan.retail.stock.R
import kotlinx.android.synthetic.main.stock_item_setting_icon.view.*
internal class ItemSettingIcon : RelativeLayout {
constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs) {
initLayout(context, attrs)
}
constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr) {
initLayout(context, attrs)
}
private fun initLayout(context: Context?, attrs: AttributeSet?) {
if (context == null || attrs == null)
return
View.inflate(context, R.layout.stock_item_setting_icon, this)
val typedArray = context.obtainStyledAttributes(attrs, R.styleable.ItemSettingIcon)
item_icon.setImageResource(typedArray.getResourceId(R.styleable.ItemSettingIcon_item_icon, -1)) //NPE here
item_title.setText(typedArray.getResourceId(R.styleable.ItemSettingIcon_item_title, -1))
typedArray.recycle()
}
}
R.layout.stock_item_setting_icon :
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<ImageView
android:id="@+id/item_icon"
android:layout_width="@dimen/stock_setting_item_icon_size"
android:layout_height="@dimen/stock_setting_item_icon_size"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="@dimen/stock_content_left_margin" />
<TextView
android:id="@+id/item_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="@dimen/stock_10dp"
android:layout_toRightOf="@id/item_icon"
android:text="@string/stock_query"
android:textColor="@color/stock_setting_item_text_color"
android:textSize="@dimen/stock_setting_item_text_size" />
<ImageView
android:id="@+id/item_end_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="@dimen/stock_15dp"
android:src="@drawable/stock_icon_right_arrow" />
</merge>
R.styleable.ItemSettingIcon :
<declare-styleable name="ItemSettingIcon">
<attr name="item_icon" format="reference" />
<attr name="item_title" format="string" />
</declare-styleable>
Журнал ошибок:
java.lang.NullPointerException
at com.youzan.retail.stock.view.ItemSettingIcon.initLayout(ItemSettingIcon.kt:30)
at com.youzan.retail.stock.view.ItemSettingIcon.<init>(ItemSettingIcon.kt:17)
at sun.reflect.GeneratedConstructorAccessor968.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:401)
at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:184)
at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:142)
at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:229)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:421)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:432)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:336)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:863)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:72)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:837)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:866)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:72)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:837)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:866)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:72)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:837)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:394)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:327)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:386)
at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:193)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:450)
at com.android.tools.idea.rendering.RenderTask.lambda$inflate$3(RenderTask.java:590)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Есть ли ошибки, которые я могу сделать?