android - "Unable to start activity , NullPointerException"的原因

Question

在我的主要 Activity 中，我有两个按钮，单击其中一个按钮后，
它应该转到下一个 Activity ，但它在 logcat 中给出以下错误:

FATAL EXCEPTION:main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.suven/com.android.suven.Create_Memo}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)

Answer 1

在 AndroidManifest.xml 中注册另一个 Activity ，如下所示:

<activity android:name=".YourActivityName"/>