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Android開發 - 意圖

2012-09-26 35 views
1

我最近在API版本16（4.1）上啓動了Android開發。根據developer.android.com上提供的教程，我開始開發應用程序，教會了如何使用Intents。問題是，只要我的應用程序在模擬器上加載，它就會顯示應用程序不得不關閉的錯誤。我正在給我的XML代碼。有人能告訴我我要去哪裏嗎？謝謝。Android開發 - 意圖

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="horizontal"> 


<EditText 
    android:id="@+id/et1" 
    android:layout_width="0dp" 
    android:layout_height="wrap_content" 
    android:hint="Edit text" 
    android:layout_weight="1" 
    tools:ignore="HardcodedText" /> 

<Button 
    android:id="@+id/b1" 
    android:layout_width="wrap_content" 
    android:layout_height="40dp" 
    android:text="Press" 
    android:onClick="sendMessage" 
    tools:ignore="HardcodedText" /> 

</LinearLayout>

logcat在下面給出。

09-26 19:35:03.880: E/Trace(615): error opening trace file: No such file or directory  (2) 
09-26 19:35:04.430: D/AndroidRuntime(615): Shutting down VM 
09-26 19:35:04.430: W/dalvikvm(615): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 
09-26 19:35:04.471: E/AndroidRuntime(615): FATAL EXCEPTION: main 
09-26 19:35:04.471: E/AndroidRuntime(615): java.lang.RuntimeException: Unable to  instantiate activity ComponentInfo{com.learn.training1/com.learn.training1.Training1}:  java.lang.NullPointerException 
09-26 19:35:04.471: E/AndroidRuntime(615):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983) 
09-26 19:35:04.471: E/AndroidRuntime(615): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
09-26 19:35:04.471: E/AndroidRuntime(615): at android.app.ActivityThread.access$600(ActivityThread.java:130) 
09-26 19:35:04.471: E/AndroidRuntime(615): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
09-26 19:35:04.471: E/AndroidRuntime(615): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-26 19:35:04.471: E/AndroidRuntime(615): at android.os.Looper.loop(Looper.java:137) 
09-26 19:35:04.471: E/AndroidRuntime(615): at android.app.ActivityThread.main(ActivityThread.java:4745) 
09-26 19:35:04.471: E/AndroidRuntime(615): at java.lang.reflect.Method.invokeNative(Native Method) 
09-26 19:35:04.471: E/AndroidRuntime(615): at java.lang.reflect.Method.invoke(Method.java:511) 
09-26 19:35:04.471: E/AndroidRuntime(615): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
09-26 19:35:04.471: E/AndroidRuntime(615): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
09-26 19:35:04.471: E/AndroidRuntime(615): at dalvik.system.NativeStart.main(Native Method) 
09-26 19:35:04.471: E/AndroidRuntime(615): Caused by: java.lang.NullPointerException 
09-26 19:35:04.471: E/AndroidRuntime(615): at android.app.Activity.findViewById(Activity.java:1825) 
09-26 19:35:04.471: E/AndroidRuntime(615): at com.learn.training1.Training1.<init>(Training1.java:15) 
09-26 19:35:04.471: E/AndroidRuntime(615): at java.lang.Class.newInstanceImpl(Native Method) 
09-26 19:35:04.471: E/AndroidRuntime(615): at java.lang.Class.newInstance(Class.java:1319) 
09-26 19:35:04.471: E/AndroidRuntime(615): at android.app.Instrumentation.newActivity(Instrumentation.java:1053) 
09-26 19:35:04.471: E/AndroidRuntime(615): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974) 
09-26 19:35:04.471: E/AndroidRuntime(615): ... 11 more 
09-26 19:35:32.352: I/Process(615): Sending signal. PID: 615 SIG: 9 
09-26 19:39:22.460: E/Trace(664): error opening trace file: No such file or directory (2) 
09-26 19:39:22.820: D/AndroidRuntime(664): Shutting down VM 
09-26 19:39:22.820: W/dalvikvm(664): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 
09-26 19:39:22.846: E/AndroidRuntime(664): FATAL EXCEPTION: main 
09-26 19:39:22.846: E/AndroidRuntime(664): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.learn.training1/com.learn.training1.Training1}: java.lang.NullPointerException 
09-26 19:39:22.846: E/AndroidRuntime(664):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983) 
09-26 19:39:22.846: E/AndroidRuntime(664): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
09-26 19:39:22.846: E/AndroidRuntime(664): at android.app.ActivityThread.access$600(ActivityThread.java:130) 
09-26 19:39:22.846: E/AndroidRuntime(664): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
09-26 19:39:22.846: E/AndroidRuntime(664): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-26 19:39:22.846: E/AndroidRuntime(664): at android.os.Looper.loop(Looper.java:137) 
09-26 19:39:22.846: E/AndroidRuntime(664): at android.app.ActivityThread.main(ActivityThread.java:4745) 
09-26 19:39:22.846: E/AndroidRuntime(664): at java.lang.reflect.Method.invokeNative(Native Method) 
09-26 19:39:22.846: E/AndroidRuntime(664): at java.lang.reflect.Method.invoke(Method.java:511) 
09-26 19:39:22.846: E/AndroidRuntime(664): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
09-26 19:39:22.846: E/AndroidRuntime(664): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
09-26 19:39:22.846: E/AndroidRuntime(664): at dalvik.system.NativeStart.main(Native Method) 
09-26 19:39:22.846: E/AndroidRuntime(664): Caused by: java.lang.NullPointerException 
09-26 19:39:22.846: E/AndroidRuntime(664): at android.app.Activity.findViewById(Activity.java:1825) 
09-26 19:39:22.846: E/AndroidRuntime(664): at com.learn.training1.Training1.<init>(Training1.java:15) 
09-26 19:39:22.846: E/AndroidRuntime(664): at java.lang.Class.newInstanceImpl(Native Method) 
09-26 19:39:22.846: E/AndroidRuntime(664): at java.lang.Class.newInstance(Class.java:1319) 
09-26 19:39:22.846: E/AndroidRuntime(664): at android.app.Instrumentation.newActivity(Instrumentation.java:1053) 
09-26 19:39:22.846: E/AndroidRuntime(664): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974) 
09-26 19:39:22.846: E/AndroidRuntime(664): ... 11 more 
09-26 19:40:29.130: E/Trace(712): error opening trace file: No such file or directory (2) 
09-26 19:40:29.431: D/dalvikvm(712): newInstance failed: Lcom/learn/training1/Training1; not accessible to Landroid/app/Instrumentation; 
09-26 19:40:29.431: D/AndroidRuntime(712): Shutting down VM 
09-26 19:40:29.431: W/dalvikvm(712): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 
09-26 19:40:29.461: E/AndroidRuntime(712): FATAL EXCEPTION: main 
09-26 19:40:29.461: E/AndroidRuntime(712): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.learn.training1/com.learn.training1.Training1}: java.lang.IllegalAccessException: access to class not allowed 
09-26 19:40:29.461: E/AndroidRuntime(712): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983) 
09-26 19:40:29.461: E/AndroidRuntime(712): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
09-26 19:40:29.461: E/AndroidRuntime(712): at android.app.ActivityThread.access$600(ActivityThread.java:130) 
09-26 19:40:29.461: E/AndroidRuntime(712): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
09-26 19:40:29.461: E/AndroidRuntime(712): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-26 19:40:29.461: E/AndroidRuntime(712): at android.os.Looper.loop(Looper.java:137) 
09-26 19:40:29.461: E/AndroidRuntime(712): at android.app.ActivityThread.main(ActivityThread.java:4745) 
09-26 19:40:29.461: E/AndroidRuntime(712): at java.lang.reflect.Method.invokeNative(Native Method) 
09-26 19:40:29.461: E/AndroidRuntime(712): at java.lang.reflect.Method.invoke(Method.java:511) 
09-26 19:40:29.461: E/AndroidRuntime(712): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
09-26 19:40:29.461: E/AndroidRuntime(712): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
09-26 19:40:29.461: E/AndroidRuntime(712): at dalvik.system.NativeStart.main(Native Method) 
09-26 19:40:29.461: E/AndroidRuntime(712): Caused by: java.lang.IllegalAccessException: access to class not allowed 
09-26 19:40:29.461: E/AndroidRuntime(712): at java.lang.Class.newInstanceImpl(Native Method) 
09-26 19:40:29.461: E/AndroidRuntime(712): at java.lang.Class.newInstance(Class.java:1319) 
09-26 19:40:29.461: E/AndroidRuntime(712): at android.app.Instrumentation.newActivity(Instrumentation.java:1053) 
09-26 19:40:29.461: E/AndroidRuntime(712): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974) 
09-26 19:40:29.461: E/AndroidRuntime(712): ... 11 more 
09-26 19:43:52.020: E/Trace(760): error opening trace file: No such file or directory (2) 
09-26 19:43:52.110: D/dalvikvm(760): newInstance failed: Lcom/learn/training1/Training1; not accessible to Landroid/app/Instrumentation; 
09-26 19:43:52.110: D/AndroidRuntime(760): Shutting down VM 
09-26 19:43:52.110: W/dalvikvm(760): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 
09-26 19:43:52.190: E/AndroidRuntime(760): FATAL EXCEPTION: main 
09-26 19:43:52.190: E/AndroidRuntime(760): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.learn.training1/com.learn.training1.Training1}: java.lang.IllegalAccessException: access to class not allowed 
09-26 19:43:52.190: E/AndroidRuntime(760): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983) 
09-26 19:43:52.190: E/AndroidRuntime(760): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
09-26 19:43:52.190: E/AndroidRuntime(760): at android.app.ActivityThread.access$600(ActivityThread.java:130) 
09-26 19:43:52.190: E/AndroidRuntime(760): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
09-26 19:43:52.190: E/AndroidRuntime(760): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-26 19:43:52.190: E/AndroidRuntime(760): at android.os.Looper.loop(Looper.java:137) 
09-26 19:43:52.190: E/AndroidRuntime(760): at android.app.ActivityThread.main(ActivityThread.java:4745) 
09-26 19:43:52.190: E/AndroidRuntime(760): at java.lang.reflect.Method.invokeNative(Native Method) 
09-26 19:43:52.190: E/AndroidRuntime(760):  at java.lang.reflect.Method.invoke(Method.java:511) 
09-26 19:43:52.190: E/AndroidRuntime(760): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
09-26 19:43:52.190: E/AndroidRuntime(760): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
09-26 19:43:52.190: E/AndroidRuntime(760): at dalvik.system.NativeStart.main(Native Method) 
09-26 19:43:52.190: E/AndroidRuntime(760): Caused by: java.lang.IllegalAccessException: access to class not allowed 
09-26 19:43:52.190: E/AndroidRuntime(760): at java.lang.Class.newInstanceImpl(Native Method) 
09-26 19:43:52.190: E/AndroidRuntime(760): at java.lang.Class.newInstance(Class.java:1319) 
09-26 19:43:52.190: E/AndroidRuntime(760): at android.app.Instrumentation.newActivity(Instrumentation.java:1053) 
09-26 19:43:52.190: E/AndroidRuntime(760): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974) 
09-26 19:43:52.190: E/AndroidRuntime(760): ... 11 more 
09-26 19:47:20.550: I/Process(810): Sending signal. PID: 810 SIG: 9

來源

2012-09-26 Prakhar Mohan Srivastava

+1

總是把你的logcat（例外）當提問相關的崩潰 – waqaslam

+0

對不起。涉及到android的時候，我真的沒有經驗。我應該提交什麼logcat的部分？一切？ –

+0

錯誤部分...我的意思是紅色的消息。否則把它全部:) – waqaslam

回答

1

看起來你的活動沒有正確申報（也許你沒有把它做成public？）。你應該有一個名爲Training1.java文件，在這個文件中，你應該有類似

public class Training1 extends Activity { 
    ...your activity code here... 
}

見https://groups.google.com/forum/?fromgroups=#!topic/android-developers/0Gw5WHc1J6g

編輯：添加備註

注：此外，你不應該有任何的構造函數。 Android框架爲您提供幫助。

來源

2012-09-26 15:38:00

+1

Theres在'com.learn.training1.Training1處只是一個'NullPointerException'。 （Training1.java:15）' – Leandros

+2

@Leandros實際上，它看起來像OP公佈了他的整個logcat有多次嘗試。我的回答是指最近一次19:43:52。在19點35分04秒，19點39分22秒和19點40分29秒的其他嘗試中還有其他錯誤（包括你提到的NPE）。在發佈他的問題之前，OP可能嘗試了幾件不同的事情。 –

+0

哦，我明白了。之前沒有注意到它。 – Leandros

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