不明原因NullPointerError引用的API绘制时<8

我有当API 8运行按预期工作的一个应用程序，但是当我在任何旧的API版本上运行它，它崩溃了：不明原因NullPointerError引用的API绘制时<8

10-28 12:10:50.755: ERROR/AndroidRuntime(1864): Uncaught handler: thread main exiting due to uncaught exception 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nw.caremeter/com.nw.caremeter.CareMeter}: android.view.InflateException: Binary XML file line #35: Error inflating class <unknown> 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2621) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.app.ActivityThread.access$2200(ActivityThread.java:126) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.os.Handler.dispatchMessage(Handler.java:99) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.os.Looper.loop(Looper.java:123) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.app.ActivityThread.main(ActivityThread.java:4595) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at java.lang.reflect.Method.invoke(Method.java:521) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at dalvik.system.NativeStart.main(Native Method) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864): Caused by: android.view.InflateException: Binary XML file line #35: Error inflating class <unknown> 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.view.LayoutInflater.createView(LayoutInflater.java:513) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:618) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.view.LayoutInflater.inflate(LayoutInflater.java:407) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.view.LayoutInflater.inflate(LayoutInflater.java:320) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.view.LayoutInflater.inflate(LayoutInflater.java:276) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.app.Activity.setContentView(Activity.java:1629) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at com.nw.caremeter.onCreate(CareMeter.java:48) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  ... 11 more 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864): Caused by: java.lang.reflect.InvocationTargetException 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.widget.ImageView.<init>(ImageView.java:105) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at java.lang.reflect.Constructor.constructNative(Native Method) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at java.lang.reflect.Constructor.newInstance(Constructor.java:446) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.view.LayoutInflater.createView(LayoutInflater.java:500) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  ... 22 more 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864): Caused by: android.content.res.Resources$NotFoundException: File res/drawable/needle_green.xml from drawable resource ID #0x7f020005 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.content.res.Resources.loadDrawable(Resources.java:1693) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.content.res.TypedArray.getDrawable(TypedArray.java:548) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.widget.ImageView.<init>(ImageView.java:115) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  ... 26 more 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864): Caused by: java.lang.NullPointerException 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.graphics.drawable.RotateDrawable.inflate(RotateDrawable.java:207) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:788) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.graphics.drawable.Drawable.createFromXml(Drawable.java:729) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  at android.content.res.Resources.loadDrawable(Resources.java:1690) 
10-28 12:10:50.765: ERROR/AndroidRuntime(1864):  ... 28 more

什么原因在API7上可能会有这个失败吗？我的drawable资源在res/drawable中（我尝试复制/绘制，并且问题依然存在，无论drawable- {hdpi，ldpi}文件夹）。为了完整起见，needle_green.xml的缘故：

<?xml version="1.0" encoding="UTF-8"?> 
<rotate   xmlns:android="http://schemas.android.com/apk/res/android" 
       android:fromDegrees="90" 
       android:toDegrees="90" 
       android:pivotY="125" 
       android:drawable="@drawable/needle_base_green" />

而且needle_base_green：

<?xml version="1.0" encoding="UTF-8"?> 
<shape   xmlns:android="http://schemas.android.com/apk/res/android" 
       android:shape="line"> 
    <stroke  android:width="2dp" 
       android:color="#00ff00" /> 
</shape>

这是一个很值得首款Android应用程序，那么它很可能令人震惊的事微不足道。谢谢你的帮助。

来源

2010-10-28 Estel

我要说的尝试，并已蚀重新生成的对象。 “项目菜单 - >清理...”然后保存一个java文件，它会重新生成对象。看看是否有帮助。 – 2010-10-28 12:23:52

我已经尝试了好几次不幸：（ – Estel 2010-10-28 12:28:39

Android无法找到res/drawable/needle_green.xml。你有没有，如果没有向我们展示代码。

补充说： 尝试使用＃FFFF0000（前两个是阿尔法）的颜色值

来源

2010-10-28 12:29:23

它给出了两个nullpointererrors，这取决于哪一个被首先引用。 _base_版本是类似的相同） <？xml version =“1.0”encoding =“UTF-8”？> – Estel 2010-10-28 12:32:28

我已经编辑我的答案 – 2010-10-28 12:44:17

没有运气，我怕。同样的错误。 – Estel 2010-10-28 12:58:35

Android在res/drawable中查找，而不是在res/drawables中。

来源

2010-10-28 12:26:24

对不起，这些都是我的文章中的（全部！）错别字 – Estel 2010-10-28 12:28:09

不明原因NullPointerError引用的API绘制时<8

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