我正在尝试开发一个日期选择器,该日期选择器在设置时设置文本 View 的值。
但是我无法从处理日期选择器的DialogFragment
中选择电视。
我尝试了getView
,但该应用程序在特定时间点崩溃了。
这是我的代码:
@SuppressLint("NewApi")
public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
TextView mTextView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// R.layout.my_layout - that's the layout where your textview is placed
View view = inflater.inflate(R.layout.activity_register_screen, container, false);
mTextView = (TextView) view.findViewById(R.id.tvDate);
// you can use your textview.
return view;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current date as the default date in the picker
final Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH);
int day = c.get(Calendar.DAY_OF_MONTH);
// Create a new instance of DatePickerDialog and return it
return new DatePickerDialog(getActivity(), this, year, month, day);
}
public void onDateSet(DatePicker view, int year, int month, int day) {
int syear = year;
int smonth = month;
int sday = day;
// set selected date into textview
mTextView.setText(new StringBuilder().append(smonth + 1)
.append("-").append(sday).append("-").append(syear)
.append(" "));
}
}
更新了新代码并出现以下错误:
04-15 09:45:30.880: E/AndroidRuntime(23016): FATAL EXCEPTION: main
04-15 09:45:30.880: E/AndroidRuntime(23016): android.util.AndroidRuntimeException: requestFeature() must be called before adding content
04-15 09:45:30.880: E/AndroidRuntime(23016): at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:239)
04-15 09:45:30.880: E/AndroidRuntime(23016): at com.android.internal.app.AlertController.installContent(AlertController.java:236)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.AlertDialog.onCreate(AlertDialog.java:336)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.Dialog.dispatchOnCreate(Dialog.java:353)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.Dialog.show(Dialog.java:257)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.DialogFragment.onStart(DialogFragment.java:490)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.Fragment.performStart(Fragment.java:1537)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:866)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1036)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.BackStackRecord.run(BackStackRecord.java:622)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1386)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.FragmentManagerImpl$1.run(FragmentManager.java:430)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.os.Handler.handleCallback(Handler.java:605)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.os.Handler.dispatchMessage(Handler.java:92)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.os.Looper.loop(Looper.java:137)
04-15 09:45:30.880: E/AndroidRuntime(23016): at android.app.ActivityThread.main(ActivityThread.java:4517)
04-15 09:45:30.880: E/AndroidRuntime(23016): at java.lang.reflect.Method.invokeNative(Native Method)
04-15 09:45:30.880: E/AndroidRuntime(23016): at java.lang.reflect.Method.invoke(Method.java:511)
04-15 09:45:30.880: E/AndroidRuntime(23016): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
04-15 09:45:30.880: E/AndroidRuntime(23016): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
04-15 09:45:30.880: E/AndroidRuntime(23016): at dalvik.system.NativeStart.main(Native Method)
解决了
最佳答案
要在“片段/片段”对话框中获取特定 View ,应使用onCreateView()
。这是一个示例如何执行此操作:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// R.layout.my_layout - that's the layout where your textview is placed
View view = inflater.inflate(R.layout.my_layout, container, false);
TextView mTextView = (TextView) view.findViewById(R.id.colors);
// you can use your textview.
return view;
}
首先检查
onCreateDialog()
是否在onCreateView()
之前被调用,如果是这样,请尝试使用以下代码:@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the Builder class for convenient dialog construction
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View view = inflater.inflate(R.layout. activity_register_screen, null);
builder.setView(view);
// Create the AlertDialog object and return it
return builder.create();
}
关于java - DialogFragment中的Android findViewById,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/15990995/