Android 在动态创建的活动中使用共享首选项

我有一个动态创建的活动，它没有onCreate（）方法。在我的createView（）方法中的一个onTouch（）方法中使用SharedReference时遇到问题。调用GetSharedReferences（）时，我得到一个空指针异常。我猜上下文为null，因为getApplicationContext（）和getBaseContext（）都会导致null指针异常。在这种情况下，如何使用共享首选项

以下是我的createView（）代码：

以下是logcat输出：

07-04 09:52:47.295: D/OverlayActivity(6146): onTouch
07-04 09:52:47.295: D/OverlayActivity(6146): Result is u=qwe&p=asd
07-04 09:52:47.295: E/InputEventReceiver(6146): Exception dispatching input event.
07-04 09:52:47.295: E/MessageQueue-JNI(6146): Exception in MessageQueue callback: handleReceiveCallback
07-04 09:52:47.305: E/MessageQueue-JNI(6146): java.lang.NullPointerException
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:161)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at com.example.test.OverlayActivity$2.onTouch(OverlayActivity.java:186)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.View.dispatchTouchEvent(View.java:7293)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2179)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1914)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2185)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1886)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.View.dispatchPointerEvent(View.java:7514)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3679)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3623)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4798)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4777)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4873)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:208)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.os.MessageQueue.nativePollOnce(Native Method)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.os.MessageQueue.next(MessageQueue.java:125)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.os.Looper.loop(Looper.java:135)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.app.ActivityThread.main(ActivityThread.java:5751)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at java.lang.reflect.Method.invokeNative(Native Method)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at java.lang.reflect.Method.invoke(Method.java:511)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at dalvik.system.NativeStart.main(Native Method)
07-04 09:52:47.305: W/dalvikvm(6146): threadid=1: thread exiting with uncaught exception (group=0x40c34a08)
07-04 09:52:47.310: E/AndroidRuntime(6146): FATAL EXCEPTION: main
07-04 09:52:47.310: E/AndroidRuntime(6146): java.lang.NullPointerException
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:161)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at com.example.test.OverlayActivity$2.onTouch(OverlayActivity.java:186)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.View.dispatchTouchEvent(View.java:7293)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2179)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1914)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2185)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1886)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.View.dispatchPointerEvent(View.java:7514)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3679)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3623)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4798)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4777)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4873)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:208)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.os.MessageQueue.nativePollOnce(Native Method)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.os.MessageQueue.next(MessageQueue.java:125)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.os.Looper.loop(Looper.java:135)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.app.ActivityThread.main(ActivityThread.java:5751)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at java.lang.reflect.Method.invokeNative(Native Method)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at java.lang.reflect.Method.invoke(Method.java:511)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at dalvik.system.NativeStart.main(Native Method)

---

我做错了什么？

好的，我可以在构造函数中使用上下文。我真傻。

好吧，我可以在构造函数中使用上下文。我真傻。

getActivity（）有效吗？这是活动吗？我只是看到您动态创建了一个布局。createView方法在哪个类中？getActivity（）工作吗？这是一个活动吗？我只是看到您动态创建了一个布局。createView方法在哪个类中？

07-04 09:52:47.295: D/OverlayActivity(6146): onTouch
07-04 09:52:47.295: D/OverlayActivity(6146): Result is u=qwe&p=asd
07-04 09:52:47.295: E/InputEventReceiver(6146): Exception dispatching input event.
07-04 09:52:47.295: E/MessageQueue-JNI(6146): Exception in MessageQueue callback: handleReceiveCallback
07-04 09:52:47.305: E/MessageQueue-JNI(6146): java.lang.NullPointerException
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:161)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at com.example.test.OverlayActivity$2.onTouch(OverlayActivity.java:186)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.View.dispatchTouchEvent(View.java:7293)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2179)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1914)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2185)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1886)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.View.dispatchPointerEvent(View.java:7514)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3679)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3623)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4798)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4777)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4873)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:208)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.os.MessageQueue.nativePollOnce(Native Method)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.os.MessageQueue.next(MessageQueue.java:125)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.os.Looper.loop(Looper.java:135)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at android.app.ActivityThread.main(ActivityThread.java:5751)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at java.lang.reflect.Method.invokeNative(Native Method)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at java.lang.reflect.Method.invoke(Method.java:511)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
07-04 09:52:47.305: E/MessageQueue-JNI(6146):   at dalvik.system.NativeStart.main(Native Method)
07-04 09:52:47.305: W/dalvikvm(6146): threadid=1: thread exiting with uncaught exception (group=0x40c34a08)
07-04 09:52:47.310: E/AndroidRuntime(6146): FATAL EXCEPTION: main
07-04 09:52:47.310: E/AndroidRuntime(6146): java.lang.NullPointerException
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:161)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at com.example.test.OverlayActivity$2.onTouch(OverlayActivity.java:186)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.View.dispatchTouchEvent(View.java:7293)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2179)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1914)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2185)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1886)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.View.dispatchPointerEvent(View.java:7514)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3679)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3623)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4798)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4777)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4873)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:208)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.os.MessageQueue.nativePollOnce(Native Method)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.os.MessageQueue.next(MessageQueue.java:125)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.os.Looper.loop(Looper.java:135)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at android.app.ActivityThread.main(ActivityThread.java:5751)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at java.lang.reflect.Method.invokeNative(Native Method)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at java.lang.reflect.Method.invoke(Method.java:511)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
07-04 09:52:47.310: E/AndroidRuntime(6146):     at dalvik.system.NativeStart.main(Native Method)