java–Unfortunatley My First App已停止在模拟器中

概述我正在Android官方网站上尝试第一个教程.这是在单击send时显示消息,但是当我单击send时出现错误.我尝试过这些问题,但我无法找到问题的答案我对Java和Android缺乏经验.错误日志：12-1818:56:33.421:W/Trace(1004):UnexpectedvaluefromnativeGetEnabledTags:012-1818:56

我正在Android官方网站上尝试第一个教程.这是在单击send时显示消息,但是当我单击send时出现错误.

我尝试过这些问题,但我无法找到问题的答案

我对Java和AndroID缺乏经验.

错误日志：

12-18 18:56:33.421: W/Trace(1004): Unexpected value from nativeGetEnabledTags: 012-18 18:56:33.421: W/Trace(1004): Unexpected value from nativeGetEnabledTags: 012-18 18:56:33.450: W/Trace(1004): Unexpected value from nativeGetEnabledTags: 012-18 18:56:33.480: D/AndroIDRuntime(1004): Shutting down VM12-18 18:56:33.490: W/dalvikvm(1004): threadID=1: thread exiting with uncaught exception (group=0x40a70930)12-18 18:56:33.520: E/AndroIDRuntime(1004): FATAL EXCEPTION: main12-18 18:56:33.520: E/AndroIDRuntime(1004): java.lang.IllegalStateException: Could not execute method of the activity12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.vIEw.VIEw.onClick(VIEw.java:3597)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.vIEw.VIEw.performClick(VIEw.java:4202)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.vIEw.VIEw$PerformClick.run(VIEw.java:17340)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.os.Handler.handleCallback(Handler.java:725)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.os.Handler.dispatchMessage(Handler.java:92)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.os.Looper.loop(Looper.java:137)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.app.ActivityThread.main(ActivityThread.java:5039)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at java.lang.reflect.Method.invokeNative(Native Method)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at java.lang.reflect.Method.invoke(Method.java:511)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:560)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at dalvik.system.NativeStart.main(Native Method)12-18 18:56:33.520: E/AndroIDRuntime(1004): Caused by: java.lang.reflect.InvocationTargetException12-18 18:56:33.520: E/AndroIDRuntime(1004):     at java.lang.reflect.Method.invokeNative(Native Method)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at java.lang.reflect.Method.invoke(Method.java:511)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.vIEw.VIEw.onClick(VIEw.java:3592)12-18 18:56:33.520: E/AndroIDRuntime(1004):     ... 11 more12-18 18:56:33.520: E/AndroIDRuntime(1004): Caused by: androID.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.myfirstapp/com.example.myfirstapp.displayMessageActivity}; have you declared this activity in your AndroIDManifest.xml?12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1618)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.app.Instrumentation.execStartActivity(Instrumentation.java:1417)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.app.Activity.startActivityForResult(Activity.java:3370)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.app.Activity.startActivityForResult(Activity.java:3331)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.app.Activity.startActivity(Activity.java:3566)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at androID.app.Activity.startActivity(Activity.java:3534)12-18 18:56:33.520: E/AndroIDRuntime(1004):     at com.example.myfirstapp.MainActivity.sendMessage(MainActivity.java:37)12-18 18:56:33.520: E/AndroIDRuntime(1004):     ... 14 more12-18 18:56:37.129: I/Process(1004): Sending signal. PID: 1004 SIG: 9

解决方法:

Unable to find explicit activity class
{com.example.myfirstapp/com.example.myfirstapp.displayMessageActivity};
have you declared this activity in your AndroIDManifest.xml?

所以请确保您已在AndroIDManifest中声明displayMessageActivity：

<activity    androID:name="com.example.myfirstapp.displayMessageActivity"></activity>

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