不幸的是 Project_Name 已停止答案

【问题标题】：Unfortunately Project_Name Has Stopped不幸的是 Project_Name 已停止
【发布时间】：2012-07-12 05:00:27
【问题描述】：

我有一个简单的应用程序，您可以在 textview 中输入文本并按提交，它会在另一个 Activity 中显示文本。但是，当我按下提交时，给了我消息“不幸的是发送已停止” ：

07-11 19:38:01.925: E/Trace(729): error opening trace file: No such file or directory (2)
07-11 19:38:05.815: I/Choreographer(729): Skipped 451 frames!  The application may be doing too much work on its main thread.
07-11 19:38:06.009: D/gralloc_goldfish(729): Emulator without GPU emulation detected.
07-11 19:38:35.046: I/Choreographer(729): Skipped 45 frames!  The application may be doing too much work on its main thread.
07-11 19:38:41.427: D/AndroidRuntime(729): Shutting down VM
07-11 19:38:41.435: W/dalvikvm(729): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
07-11 19:38:41.585: E/AndroidRuntime(729): FATAL EXCEPTION: main
07-11 19:38:41.585: E/AndroidRuntime(729): java.lang.IllegalStateException: Could not execute method of the activity
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.view.View$1.onClick(View.java:3591)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.view.View.performClick(View.java:4084)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.view.View$PerformClick.run(View.java:16966)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.os.Handler.handleCallback(Handler.java:615)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.os.Handler.dispatchMessage(Handler.java:92)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.os.Looper.loop(Looper.java:137)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.app.ActivityThread.main(ActivityThread.java:4745)
07-11 19:38:41.585: E/AndroidRuntime(729):  at java.lang.reflect.Method.invokeNative(Native Method)
07-11 19:38:41.585: E/AndroidRuntime(729):  at java.lang.reflect.Method.invoke(Method.java:511)
07-11 19:38:41.585: E/AndroidRuntime(729):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
07-11 19:38:41.585: E/AndroidRuntime(729):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-11 19:38:41.585: E/AndroidRuntime(729):  at dalvik.system.NativeStart.main(Native Method)
07-11 19:38:41.585: E/AndroidRuntime(729): Caused by: java.lang.reflect.InvocationTargetException
07-11 19:38:41.585: E/AndroidRuntime(729):  at java.lang.reflect.Method.invokeNative(Native Method)
07-11 19:38:41.585: E/AndroidRuntime(729):  at java.lang.reflect.Method.invoke(Method.java:511)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.view.View$1.onClick(View.java:3586)
07-11 19:38:41.585: E/AndroidRuntime(729):  ... 11 more
07-11 19:38:41.585: E/AndroidRuntime(729): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.point/com.point.DisplayMessageActivity}; have you declared this activity in your AndroidManifest.xml?
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1541)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.app.Instrumentation.execStartActivity(Instrumentation.java:1416)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.app.Activity.startActivityForResult(Activity.java:3351)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.app.Activity.startActivityForResult(Activity.java:3312)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.app.Activity.startActivity(Activity.java:3522)
07-11 19:38:41.585: E/AndroidRuntime(729):  at android.app.Activity.startActivity(Activity.java:3490)
07-11 19:38:41.585: E/AndroidRuntime(729):  at com.point.MainActivity.sendMessage(MainActivity.java:34)
07-11 19:38:41.585: E/AndroidRuntime(729):  ... 14 more
07-11 19:43:41.995: I/Process(729): Sending signal. PID: 729 SIG: 9

SO 上的链接也说了一些关于不创建 TextView 并且它为 NULL 的内容。

有人可以帮我吗？

【问题讨论】：

标签： java android

【解决方案1】：

如果您仔细查看错误日志，您会看到：

原因：android.content.ActivityNotFoundException：找不到明确的活动类{com.point/com.point.DisplayMessageActivity}；您是否在 AndroidManifest.xml 中声明了此活动？

那么，您的DisplayMessageActivity 是否在AndroidManifest.xml 文件中声明？

【讨论】：

我如何发现这是所有给出的错误的问题？
第一个导致所有其他错误，如您所见，首先抛出ActivityNotFoundException，然后抛出InvocationTargetException错误，因为它试图调用一个不存在的Activity，等等。 ..
这是一个堆栈跟踪，所以在“堆栈”这个词的上下文中思考，从下往上开始，找到第一个异常。在这种情况下，它会为您说明问题，但如果没有，则从第一个异常开始，查看堆栈中引用您的一个代码文件（例如 com.point.MainActivity）的第一行并查看它在哪一行引用（MainActivity.java:34）。您的错误将从该行代码中抛出。

【解决方案2】：

将其添加到 Application Tag 下的清单文件中：

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

【讨论】：

【解决方案3】：

来自您的堆栈跟踪：

Unable to find explicit activity class {com.point/com.point.DisplayMessageActivity}; 
have you declared this activity in your AndroidManifest.xml?

Have you?

【讨论】：