NullPointerException xml 布局？
NullPointerException xml layout?
我正在尝试使用 ScrollView 创建一个 LinearLayout。在这个 ScrollView 中，我需要一些 ListView。当我创建确实抛出异常时，NullPointerException 我无法理解为什么会出现问题。
我正在尝试这个。
XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--Header-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="15dp"
android:layout_margin="5dp"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/icon_carrinho"/>
<TextView
android:id="@+id/tvNomeCliente"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/action_bar"
android:textSize="20dp"
android:layout_marginLeft="15dp"
android:text="Nome do cliente:"/>
</LinearLayout>
<!--Nucleo-->
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="horizontal"
android:background="#ffe3b3"
android:padding="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15dp"
android:textColor="@color/action_bar"
android:text="Quant."/>
<TextView
android:textSize="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Produtos Pronta Entrega"
android:textColor="@color/action_bar"
android:layout_marginLeft="10dp"
android:layout_weight="1"/>
<TextView
android:textSize="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/action_bar"
android:layout_marginRight="5dp"
android:text="Excluir"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView
android:id="@+id/lvProntaEntrega"
android:layout_width="match_parent"
android:layout_height="150dp"
>
</ListView>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:padding="5dp"
android:background="#a84be1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:textStyle="bold"
android:layout_weight="1"
android:text="Total:"/>
<TextView
android:id="@+id/tvTotalProntaEntrega"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:textColor="#FFF"
android:textStyle="bold"
android:text="R$ 300,00:"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="horizontal"
android:background="#ffe3b3"
android:padding="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15dp"
android:textColor="@color/action_bar"
android:text="Quant."/>
<TextView
android:textSize="15dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Produtos Entrega Futura"
android:textColor="@color/action_bar"
android:layout_marginLeft="10dp"
android:layout_weight="1"/>
<TextView
android:textSize="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/action_bar"
android:layout_marginRight="5dp"
android:text="Excluir"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="@+id/lvEntregaFutura"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
</ListView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:padding="5dp"
android:background="#a84be1"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:textStyle="bold"
android:layout_weight="1"
android:text="Total:"/>
<TextView
android:id="@+id/tvTotalEntregaFutura"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:textColor="#FFF"
android:textStyle="bold"
android:text="R$ 10,00:"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_margin="5dp"
android:padding="5dp"
android:layout_height="wrap_content">
<EditText
android:layout_width="match_parent"
android:hint="Previsão de entrega"
android:layout_height="wrap_content"
android:inputType="date"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:padding="5dp"
android:background="@color/action_bar">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:textStyle="bold"
android:layout_weight="1"
android:text="Valor Total da Compra:"/>
<TextView
android:id="@+id/tvValorTotalCompra"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:textColor="#FFF"
android:textStyle="bold"
android:text="R$ 500,00:"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="vertical"
android:padding="5dp"
android:layout_weight="1">
<TextView
android:text="Forma de Pagamento"
android:padding="5dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Spinner
android:id="@+id/spinFormaPagto"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</Spinner>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginRight="50dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/icone_desconto"/>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<Button
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="Finalizar"
android:textStyle="bold"
android:textColor="#FFF"
android:background="#FF8C00"
/>
<Button
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="Limpar"
android:textStyle="bold"
android:textColor="#FFF"
android:background="#FF8C00"
android:layout_marginLeft="50dp"
/>
</LinearLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>
异常
java.lang.NullPointerException
at android.view.ViewGroup_Delegate.drawShadow(ViewGroup_Delegate.java:74)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:61)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15017)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15017)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15117)
at android.widget.FrameLayout.draw(FrameLayout.java:592)
at android.widget.ScrollView.draw(ScrollView.java:1689)
at android.view.View.draw(View.java:15022)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15017)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15017)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15117)
at android.view.View.draw(View.java:15022)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15117)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.render(RenderSessionImpl.java:587)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:334)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)
at com.android.tools.idea.rendering.RenderService.compute(RenderService.java:688)
at com.android.tools.idea.rendering.RenderService.compute(RenderService.java:677)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:932)
at com.android.tools.idea.rendering.RenderService.createRenderSession(RenderService.java:677)
at com.android.tools.idea.rendering.RenderService.render(RenderService.java:815)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:646)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access00(AndroidLayoutPreviewToolWindowManager.java:82)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.run(AndroidLayoutPreviewToolWindowManager.java:589)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.run(ProgressManagerImpl.java:178)
at com.intellij.openapi.progress.ProgressManager.executeProcessUnderProgress(ProgressManager.java:209)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:212)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:171)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.run(AndroidLayoutPreviewToolWindowManager.java:584)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:254)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
at com.intellij.util.Alarm$Request.run(Alarm.java:327)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
将 scrollview 高度设置为 wrap_content 以及它的子线性布局，由于嵌套 match_parent 它可能不会绘制布局 dependency.so 它看起来像
......
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
......
我正在尝试使用 ScrollView 创建一个 LinearLayout。在这个 ScrollView 中，我需要一些 ListView。当我创建确实抛出异常时，NullPointerException 我无法理解为什么会出现问题。
我正在尝试这个。
XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--Header-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="15dp"
android:layout_margin="5dp"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/icon_carrinho"/>
<TextView
android:id="@+id/tvNomeCliente"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/action_bar"
android:textSize="20dp"
android:layout_marginLeft="15dp"
android:text="Nome do cliente:"/>
</LinearLayout>
<!--Nucleo-->
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="horizontal"
android:background="#ffe3b3"
android:padding="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15dp"
android:textColor="@color/action_bar"
android:text="Quant."/>
<TextView
android:textSize="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Produtos Pronta Entrega"
android:textColor="@color/action_bar"
android:layout_marginLeft="10dp"
android:layout_weight="1"/>
<TextView
android:textSize="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/action_bar"
android:layout_marginRight="5dp"
android:text="Excluir"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView
android:id="@+id/lvProntaEntrega"
android:layout_width="match_parent"
android:layout_height="150dp"
>
</ListView>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:padding="5dp"
android:background="#a84be1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:textStyle="bold"
android:layout_weight="1"
android:text="Total:"/>
<TextView
android:id="@+id/tvTotalProntaEntrega"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:textColor="#FFF"
android:textStyle="bold"
android:text="R$ 300,00:"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="horizontal"
android:background="#ffe3b3"
android:padding="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15dp"
android:textColor="@color/action_bar"
android:text="Quant."/>
<TextView
android:textSize="15dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Produtos Entrega Futura"
android:textColor="@color/action_bar"
android:layout_marginLeft="10dp"
android:layout_weight="1"/>
<TextView
android:textSize="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/action_bar"
android:layout_marginRight="5dp"
android:text="Excluir"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="@+id/lvEntregaFutura"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
</ListView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:padding="5dp"
android:background="#a84be1"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:textStyle="bold"
android:layout_weight="1"
android:text="Total:"/>
<TextView
android:id="@+id/tvTotalEntregaFutura"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:textColor="#FFF"
android:textStyle="bold"
android:text="R$ 10,00:"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_margin="5dp"
android:padding="5dp"
android:layout_height="wrap_content">
<EditText
android:layout_width="match_parent"
android:hint="Previsão de entrega"
android:layout_height="wrap_content"
android:inputType="date"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:padding="5dp"
android:background="@color/action_bar">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:textStyle="bold"
android:layout_weight="1"
android:text="Valor Total da Compra:"/>
<TextView
android:id="@+id/tvValorTotalCompra"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:textColor="#FFF"
android:textStyle="bold"
android:text="R$ 500,00:"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="vertical"
android:padding="5dp"
android:layout_weight="1">
<TextView
android:text="Forma de Pagamento"
android:padding="5dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Spinner
android:id="@+id/spinFormaPagto"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</Spinner>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginRight="50dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/icone_desconto"/>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<Button
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="Finalizar"
android:textStyle="bold"
android:textColor="#FFF"
android:background="#FF8C00"
/>
<Button
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="Limpar"
android:textStyle="bold"
android:textColor="#FFF"
android:background="#FF8C00"
android:layout_marginLeft="50dp"
/>
</LinearLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>
异常
java.lang.NullPointerException
at android.view.ViewGroup_Delegate.drawShadow(ViewGroup_Delegate.java:74)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:61)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15017)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15017)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15117)
at android.widget.FrameLayout.draw(FrameLayout.java:592)
at android.widget.ScrollView.draw(ScrollView.java:1689)
at android.view.View.draw(View.java:15022)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15017)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15017)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15117)
at android.view.View.draw(View.java:15022)
at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3404)
at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15117)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.render(RenderSessionImpl.java:587)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:334)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)
at com.android.tools.idea.rendering.RenderService.compute(RenderService.java:688)
at com.android.tools.idea.rendering.RenderService.compute(RenderService.java:677)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:932)
at com.android.tools.idea.rendering.RenderService.createRenderSession(RenderService.java:677)
at com.android.tools.idea.rendering.RenderService.render(RenderService.java:815)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:646)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access00(AndroidLayoutPreviewToolWindowManager.java:82)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.run(AndroidLayoutPreviewToolWindowManager.java:589)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.run(ProgressManagerImpl.java:178)
at com.intellij.openapi.progress.ProgressManager.executeProcessUnderProgress(ProgressManager.java:209)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:212)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:171)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.run(AndroidLayoutPreviewToolWindowManager.java:584)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:254)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
at com.intellij.util.Alarm$Request.run(Alarm.java:327)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
将 scrollview 高度设置为 wrap_content 以及它的子线性布局，由于嵌套 match_parent 它可能不会绘制布局 dependency.so 它看起来像
......
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
......