ADT 的错误提示
先知先觉 2014-07-27 09:20:36 照着书上的例子 如何通过显示Intent (指定Component 属性)来启动另一个 Activity 。之前其他照着打的例子可以正常运行,就是今天这个例子运行不了。错误的 LogCat 如下,请求一点解答,谢谢。
07-27 09:12:25.177: E/AndroidRuntime(1166): FATAL EXCEPTION: main
07-27 09:12:25.177: E/AndroidRuntime(1166): Process: com.example.test_intent, PID: 1166
07-27 09:12:25.177: E/AndroidRuntime(1166): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test_intent/com.example.test_intent.First_one}: java.lang.NullPointerException
07-27 09:12:25.177: E/AndroidRuntime(1166): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
07-27 09:12:25.177: E/AndroidRuntime(1166): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
07-27 09:12:25.177: E/AndroidRuntime(1166): at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-27 09:12:25.177: E/AndroidRuntime(1166): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-27 09:12:25.177: E/AndroidRuntime(1166): at android.os.Handler.dispatchMessage(Handler.java:102)
07-27 09:12:25.177: E/AndroidRuntime(1166): at android.os.Looper.loop(Looper.java:136)
07-27 09:12:25.177: E/AndroidRuntime(1166): at android.app.ActivityThread.main(ActivityThread.java:5017)
07-27 09:12:25.177: E/AndroidRuntime(1166): at java.lang.reflect.Method.invokeNative(Native Method)
07-27 09:12:25.177: E/AndroidRuntime(1166): at java.lang.reflect.Method.invoke(Method.java:515)
07-27 09:12:25.177: E/AndroidRuntime(1166): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-27 09:12:25.177: E/AndroidRuntime(1166): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-27 09:12:25.177: E/AndroidRuntime(1166): at dalvik.system.NativeStart.main(Native Method)
07-27 09:12:25.177: E/AndroidRuntime(1166): Caused by: java.lang.NullPointerException
07-27 09:12:25.177: E/AndroidRuntime(1166): at com.example.test_intent.First_one.onCreate(First_one.java:28)
07-27 09:12:25.177: E/AndroidRuntime(1166): at android.app.Activity.performCreate(Activity.java:5231)
07-27 09:12:25.177: E/AndroidRuntime(1166): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-27 09:12:25.177: E/AndroidRuntime(1166): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
07-27 09:12:25.177: E/AndroidRuntime(1166): ... 11 more