没有上下文的ArrayAdapter Android

Question

我想ArrayAdapter在我的课程中实现一个Fragment不扩展的课程Activity.

问题是传递给ArrayAdapter的构造函数的第一个参数.

ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(<what place here>,android.R.layout.simple_list_item1,anyarraylist);

现在我应该怎么做第一个参数？我试图通过

getActivity().getApplicationContext()

在第一个参数但代码崩溃.

请帮帮我.

我的logcat:

03-17 03:33:08.029: E/AndroidRuntime(596): FATAL EXCEPTION: main
03-17 03:33:08.029: E/AndroidRuntime(596): java.lang.NullPointerException
03-17 03:33:08.029: E/AndroidRuntime(596):  at com.search.pages.SearchResults.onCreateView(SearchResults.java:92)
03-17 03:33:08.029: E/AndroidRuntime(596):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:871)
03-17 03:33:08.029: E/AndroidRuntime(596):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083)
03-17 03:33:08.029: E/AndroidRuntime(596):  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:635)
03-17 03:33:08.029: E/AndroidRuntime(596):  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1431)
03-17 03:33:08.029: E/AndroidRuntime(596):  at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:420)
03-17 03:33:08.029: E/AndroidRuntime(596):  at android.os.Handler.handleCallback(Handler.java:587)
03-17 03:33:08.029: E/AndroidRuntime(596):  at android.os.Handler.dispatchMessage(Handler.java:92)
03-17 03:33:08.029: E/AndroidRuntime(596):  at android.os.Looper.loop(Looper.java:123)
03-17 03:33:08.029: E/AndroidRuntime(596):  at android.app.ActivityThread.main(ActivityThread.java:4627)
03-17 03:33:08.029: E/AndroidRuntime(596):  at java.lang.reflect.Method.invokeNative(Native Method)
03-17 03:33:08.029: E/AndroidRuntime(596):  at java.lang.reflect.Method.invoke(Method.java:521)
03-17 03:33:08.029: E/AndroidRuntime(596):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-17 03:33:08.029: E/AndroidRuntime(596):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-17 03:33:08.029: E/AndroidRuntime(596):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

现在我应该怎么做第一个参数

getActivity()返回一个Activity,它将作为ArrayAdapter构造函数的第一个参数.Activity继承自Context.

我试图在第一个参数中传递"getActivity().getApplicationContext()",但代码崩溃了

不要调用getApplicationContext(),除非你知道正是为什么你打电话getApplicationContext().