java onCreateView(...) 片段中 setText 的问题
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Problems with setText in a fragment in onCreateView(...)
提问by Filip Eriksson
I know that people has asked similar questions but I still can't manage. I have a fragment and in the onCreateView()I have a string that I want to set equal to the text in my textView. However I can't make it work. Can somebody please give me a code example of how to write it?
我知道人们已经问过类似的问题，但我仍然无法解决。我有一个片段，并且在onCreateView()我有一个字符串，我想将其设置为与 textView 中的文本相等。但是我不能让它工作。有人可以给我一个如何编写它的代码示例吗？
I have for instance tried this which makes the app crash:
例如，我尝试过这会使应用程序崩溃：
TextView text = (TextView) getActivity().findViewById(R.id.sektion_name_detailed_view);
text.setText("test");
Stacktrace:
堆栈跟踪：
06-12 23:02:59.926: W/dalvikvm(2402): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
06-12 23:02:59.933: E/AndroidRuntime(2402): FATAL EXCEPTION: main
06-12 23:02:59.933: E/AndroidRuntime(2402): java.lang.NullPointerException
06-12 23:02:59.933: E/AndroidRuntime(2402): at se.Appsolut.student.DetailedViewSektionerFragment.onCreateView(DetailedViewSektionerFragment.java:21)
06-12 23:02:59.933: E/AndroidRuntime(2402): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
06-12 23:02:59.933: E/AndroidRuntime(2402): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
06-12 23:02:59.933: E/AndroidRuntime(2402): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
06-12 23:02:59.933: E/AndroidRuntime(2402): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
06-12 23:02:59.933: E/AndroidRuntime(2402): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
06-12 23:02:59.933: E/AndroidRuntime(2402): at android.support.v4.app.FragmentManagerImpl.run(FragmentManager.java:429)
06-12 23:02:59.933: E/AndroidRuntime(2402): at android.os.Handler.handleCallback(Handler.java:615)
06-12 23:02:59.933: E/AndroidRuntime(2402): at android.os.Handler.dispatchMessage(Handler.java:92)
06-12 23:02:59.933: E/AndroidRuntime(2402): at android.os.Looper.loop(Looper.java:137)
06-12 23:02:59.933: E/AndroidRuntime(2402): at android.app.ActivityThread.main(ActivityThread.java:4745)
06-12 23:02:59.933: E/AndroidRuntime(2402): at java.lang.reflect.Method.invokeNative(Native Method)
06-12 23:02:59.933: E/AndroidRuntime(2402): at java.lang.reflect.Method.invoke(Method.java:511)
06-12 23:02:59.933: E/AndroidRuntime(2402): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
06-12 23:02:59.933: E/AndroidRuntime(2402): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
06-12 23:02:59.933: E/AndroidRuntime(2402): at dalvik.system.NativeStart.main(Native Method)
回答by neo108
If it is a fragment then you will have to inflate the layout first on onCerateViewbefore accessing the elements.
如果它是一个片段，那么onCerateView在访问元素之前，您必须先对布局进行膨胀。
LayoutInflater lf = getActivity().getLayoutInflater();
View view = lf.inflate(R.layout.fragment, container, false); //pass the correct layout name for the fragment
TextView text = (TextView) view.findViewById(R.id.sektion_name_detailed_view);
text.setText("test");
This should fix your problem.
这应该可以解决您的问题。
回答by Hamza Rahman
My Approach is Little bit Different to set Text in Fragment. Basically I use view Object to set Text in Fragment. Because onCreateView() Return a View Every single Component using inflater Class inflate method. So I have Created a View Object Globally and assign it to inflate method and return it in onCtreateView() Method. So, As a Result TextView Component is already Inside the view So I can use it anywhere i want.
我的方法在 Fragment 中设置文本有点不同。基本上我使用视图对象在片段中设置文本。因为 onCreateView() 使用 inflater 类 inflate 方法返回一个视图每个单独的组件。所以我在全局创建了一个视图对象并将它分配给 inflate 方法并在 onCtreateView() 方法中返回它。因此，作为结果 TextView 组件已经在视图内部，所以我可以在任何我想要的地方使用它。
View inflatedview = null;
public CustomerOutstanding() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
inflatedview = inflater.inflate(R.layout.fragment_customer_outstanding, container, false);
TotalAmount = (TextView)inflatedview.findViewById(R.id.TotalAmountOutstanding);
return inflatedview;
}
回答by Hàn V?n Th?o
I think maybe you edit like
我想也许你编辑像
TextView text = (TextView) findViewById(R.id.sektion_name_detailed_view);
text.setText("test");
