我开发在Android上的应用程序,我试图运行通过仿真器,但每次它告诉我,它已停止工作时间的应用程序,我得到这些线路:的Android工作室应用开发
02-22 23:22:21.977 2170-2170/com.example.sarvagyagupta1.myapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.sarvagyagupta1.myapp, PID: 2170
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.sarvagyagupta1.myapp/com.example.sarvagyagupta1.myapp.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.content.Context.getApplicationContext()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.content.Context.getApplicationContext()' on a null object reference
at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:105)
at com.example.sarvagyagupta1.myapp.MainActivity.<init>(MainActivity.java:61)
at java.lang.reflect.Constructor.newInstance(Native Method)
at java.lang.Class.newInstance(Class.java:1572)
at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
device not found
请有人帮我解决这个问题。
在android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:105) – 2015-02-23 04:30:21
getApplicationContext()”上一个空对象引用 哪里可以找到源代码?它是.java代码还是哪一个? – 2015-02-23 04:30:48
把你的源代码也 – 2015-02-23 04:59:26