Android 使imageview不可见会导致NullPointerException

我正在运行以下代码，它在iv4.setVisibility（View.INVISIBLE）行中为我提供了NullPointerException 请建议。谢谢 代码：

行iv4.setVisibility中的NullPointerException（View.INVISIBLE）

在

activity\u score.xml

中可能没有id为

imageView4

的

ImageView

您引用了错误的布局，或者布局不包含所述id的imageview

编辑：

改变

<RelativeLayout 
xmlns:android="schemas.android.com/apk/res/android"

---

post
activity\u score.xml
。。您是否在
activity\u score.xml
内声明了
R.id.imageView4
？是的，我这样做了。。。但仍然显示相同的。。。！！！当然你能把版面贴出来吗？这是一个全新的活动。产生错误的布局是：
03-05 03:49:25.477: E/AndroidRuntime(1070): FATAL EXCEPTION: main
03-05 03:49:25.477: E/AndroidRuntime(1070): java.lang.RuntimeException: Unable to start activity ComponentInfo{bitcream.candyhive.candy/bitcream.candyhive.candy.ScoreActivity}: java.lang.NullPointerException
03-05 03:49:25.477: E/AndroidRuntime(1070):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at android.os.Looper.loop(Looper.java:123)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at android.app.ActivityThread.main(ActivityThread.java:3683)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at java.lang.reflect.Method.invokeNative(Native Method)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at java.lang.reflect.Method.invoke(Method.java:507)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at dalvik.system.NativeStart.main(Native Method)
03-05 03:49:25.477: E/AndroidRuntime(1070): Caused by: java.lang.NullPointerException
03-05 03:49:25.477: E/AndroidRuntime(1070):     at bitcream.candyhive.candy.ScoreActivity.onCreate(ScoreActivity.java:42)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-05 03:49:25.477: E/AndroidRuntime(1070):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
03-05 03:49:25.477: E/AndroidRuntime(1070):     ... 11 more
03-05 03:49:28.297: I/Process(1070): Sending signal. PID: 1070 SIG: 9

<RelativeLayout 
xmlns:android="schemas.android.com/apk/res/android"

<RelativeLayout 
 xmlns:android="http://schemas.android.com/apk/res/android"