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所以我试图通过复制图像并将其粘贴到绘制资源文件夹复制从互联网上下载到我的Android工作室mainactivity XML文件的图像，但由于某些原因，我得到的“无法实例化一个或多个类”这是第一次为我以前的图像复制完全相同的方式有没有错误，除了其他图像像这样我得到这个错误的错误一。它是否与PNG或JPG格式有关？我尝试使用Gradle文件重新同步项目，但它仍然是相同的。我该怎么做才能解决这个异常？谢谢。抛出该异常显示java.lang.NullPointerException的异常导入图像到我的主要活动XML文件后
1）the process of copying and pasting image to drawable
2）The error itself after pasting the image
java.lang.NullPointerException
at android.content.res.Resources_Delegate.getValue(Resources_Delegate.java:788)
at android.content.res.Resources.getValue(Resources.java:1286)
at android.support.v7.widget.AppCompatDrawableManager.createDrawableIfNeeded(AppCompatDrawableManager.java:236)
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:199)
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:190)
at android.support.v7.content.res.AppCompatResources.getDrawable(AppCompatResources.java:100)
at android.support.v7.widget.AppCompatImageHelper.loadFromAttributes(AppCompatImageHelper.java:54)
at android.support.v7.widget.AppCompatImageView.<init>(AppCompatImageView.java:66)
at android.support.v7.widget.AppCompatImageView.<init>(AppCompatImageView.java:56)
at sun.reflect.GeneratedConstructorAccessor1111.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:475)
at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:250)
at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:213)
at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadClass(LayoutlibCallbackImpl.java:193)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:333)
at android.view.BridgeInflater.onCreateView(BridgeInflater.java:152)
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.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:368)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:567)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:549)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:863)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:549)
at com.android.tools.idea.rendering.RenderTask.lambda$inflate$1(RenderTask.java:680)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
编辑：此外，当我试图编译的代码，我的项目would'nt启动，除非我在绘制因文件夹中删除的图像文件到这个错误：`错误：执行失败的任务'：应用程序：mergeDebugResources'。
C:\Users\TP_baseline\AndroidStudioProjects\COMTProject(MeloWide)\app\src\main\res\drawable\icons8-Medal-80.png: Error: '-' is not a valid file-based resource name character: File-based resource names must contain only lowercase a-z, 0-9, or underscore`
自解释错误消息...'基于文件的资源名称只能包含小写az，0-9 ，或下划线' –