Android工作室：背景图片无效 - 无法解析符号

Question

我有一个图像和一个按钮，我想为背景创建另一个图像。 问题是，当我添加android：background =“@ drawable/celekula.jpg”它不起作用。我得到这个错误：

无法解析符号 '@绘制/ celekula.jpg' 少...... Android的XML文件

而这些都是错误的详细信息里面void验证资源引用：

java.lang.NumberFormatException: Color value '@drawable/celekula.jpg' must start with # 
at com.android.layoutlib.bridge.impl.ResourceHelper.getColor(ResourceHelper.java:87) 
at com.android.layoutlib.bridge.impl.ResourceHelper.getDrawable(ResourceHelper.java:356) 
at android.content.res.BridgeTypedArray.getDrawable(BridgeTypedArray.java:695) 
at android.view.View.<init>(View.java:4175) 
at android.view.ViewGroup.<init>(ViewGroup.java:578) 
at android.widget.LinearLayout.<init>(LinearLayout.java:211) 
at android.widget.LinearLayout.<init>(LinearLayout.java:207) 
at android.widget.LinearLayout.<init>(LinearLayout.java:203) 
at sun.reflect.GeneratedConstructorAccessor152.newInstance(Unknown Source) 
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) 
at android.view.LayoutInflater.createView(LayoutInflater.java:645) 
at android.view.BridgeInflater.onCreateView(BridgeInflater.java:163) 
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:717) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:785) 
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:222) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727) 
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:858) 
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:834) 
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821) 
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:861) 
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:834) 
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:518) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:324) 
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429) 
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:389) 
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:548) 
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:533) 
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:966) 
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:533) 
at com.android.tools.idea.rendering.RenderTask.lambda$inflate$53(RenderTask.java:659) 
at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
at java.lang.Thread.run(Thread.java:745) 

我在所有可绘制的文件夹中都有该图像（celekula.jpg）。这是我的XML代码：

<LinearLayout 
     android:orientation="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:background="@drawable/celekula.jpg" 
     > 

     <ImageView 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      app:srcCompat="@drawable/tvrdjava" 
      android:id="@+id/imageView8" 
      android:adjustViewBounds="true" 
      android:cropToPadding="false" /> 

     <Button 
      android:text="ButtonBlaTest" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:id="@+id/button" /> 

</LinearLayout> 

Answer 1

它可能无法识别图像的扩展名为.jpg，通常在ImageView的，索引的名字是通过绘制未经该文件扩展名。试着把名字放在没有扩展名的地方，android studio应该没有问题地编制索引。您始终可以尝试制作“清洁”或“重建”项目来索引新图像。