Java DialogFragment中的Android findViewById
我正在尝试开发一个日期选择器,它在设置文本视图时设置文本视图的值 但是我无法从处理日期选择器的Java DialogFragment中的Android findViewById,java,android,Java,Android,我正在尝试开发一个日期选择器,它在设置文本视图时设置文本视图的值 但是我无法从处理日期选择器的对话框片段中选择电视 我尝试了getView,但应用程序在特定点崩溃 这是我的密码: @SuppressLint("NewApi") public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener { TextView mTextView; @Ov
对话框片段
中选择电视
我尝试了getView
,但应用程序在特定点崩溃
这是我的密码:
@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(" "));
}
}
已使用新代码更新,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)
已解决要在片段/片段对话框中获取特定视图,应使用
onCreateView()
。下面是一个如何做到这一点的示例:
@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;
}
首先检查在调用onCreateView()
之前是否调用了onCreateDialog()
,如果是这样,请尝试使用以下方法:
@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();
}
在DialogFragment中查找视图有更简单的方法
@Override
public void onStart() {
super.onStart();
mTextView = (TextView) getDialog().findViewById(R.id.tvDate);
}
tvDate
在另一个片段中吗?tvDate在一个活动中。请检查我在这个线程上的答案。干杯我尝试过这个方法,但是现在应用程序在开始加载日期选择器时崩溃。请用您使用它的方式更新您的答案,crashI非常确定在调用onCreateView
之前调用了onCreateDialog
,请检查编辑的答案这对我有效。我认为这应该是公认的答案。