[英]Thread : Crash with the message “java.lang.RuntimeException: Unable to instantiate activity”
我知道這個問題已經治療了很多時間,但是我確實找不到解決我問題的答案。 這是一個連接到服務器的應用程序,因此有一個套接字,這就是為什么我使用線程(自android 4.0以來我什么也不能做)的原因,但是即使我禁用了套接字的代碼,它仍然崩潰。
這是logCat錯誤:
04-08 08:36:39.366: D/AndroidRuntime(16604): Shutting down VM
04-08 08:36:39.366: W/dalvikvm(16604): threadid=1: thread exiting with uncaught exception (group=0x4122f300)
04-08 08:36:39.366: E/AndroidRuntime(16604): FATAL EXCEPTION: main
04-08 08:36:39.366: E/AndroidRuntime(16604): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.projetlyres2013/com.example.projetlyres2013.PlanDMX}: java.lang.NullPointerException
04-08 08:36:39.366: E/AndroidRuntime(16604): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
04-08 08:36:39.366: E/AndroidRuntime(16604): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
04-08 08:36:39.366: E/AndroidRuntime(16604): at android.app.ActivityThread.access$600(ActivityThread.java:130)
04-08 08:36:39.366: E/AndroidRuntime(16604): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
04-08 08:36:39.366: E/AndroidRuntime(16604): at android.os.Handler.dispatchMessage(Handler.java:99)
04-08 08:36:39.366: E/AndroidRuntime(16604): at android.os.Looper.loop(Looper.java:137)
04-08 08:36:39.366: E/AndroidRuntime(16604): at android.app.ActivityThread.main(ActivityThread.java:4745)
04-08 08:36:39.366: E/AndroidRuntime(16604): at java.lang.reflect.Method.invokeNative(Native Method)
04-08 08:36:39.366: E/AndroidRuntime(16604): at java.lang.reflect.Method.invoke(Method.java:511)
04-08 08:36:39.366: E/AndroidRuntime(16604): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
04-08 08:36:39.366: E/AndroidRuntime(16604): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
04-08 08:36:39.366: E/AndroidRuntime(16604): at dalvik.system.NativeStart.main(Native Method)
04-08 08:36:39.366: E/AndroidRuntime(16604): Caused by: java.lang.NullPointerException
04-08 08:36:39.366: E/AndroidRuntime(16604): at android.app.Activity.findViewById(Activity.java:1825)
04-08 08:36:39.366: E/AndroidRuntime(16604): at com.example.projetlyres2013.PlanDMX.<init>(PlanDMX.java:27)
04-08 08:36:39.366: E/AndroidRuntime(16604): at java.lang.Class.newInstanceImpl(Native Method)
04-08 08:36:39.366: E/AndroidRuntime(16604): at java.lang.Class.newInstance(Class.java:1319)
04-08 08:36:39.366: E/AndroidRuntime(16604): at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
04-08 08:36:39.366: E/AndroidRuntime(16604): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
04-08 08:36:39.366: E/AndroidRuntime(16604): ... 11 more
04-08 08:36:41.326: I/Process(16604): Sending signal. PID: 16604 SIG: 9
04-08 08:46:26.556: D/AndroidRuntime(16825): Shutting down VM
//////////清單/////////
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.projetlyres2013"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.projetlyres2013.PlanDMX"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
我不知道要在平板電腦(android 4.1)上啟動它時發生了什么。 我真的需要幫助:/
謝謝
這里的NullPointer意味着您沒有將布局XML設置為Activity的contentView。 在Activity的onCreate(...)方法內部
setContentView(R.layout.some_layout-file)
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