public class MainActivity extends FragmentActivity {
TextView dateView, timeView;
String date;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dateView = (TextView) findViewById(R.id.dateTextID);
timeView = (TextView) findViewById(R.id.timeTextID);
}
public void showDatePickerDialog(View v) {
DialogFragment newFragment = new DatePickerFragment();
newFragment.show(getFragmentManager(), "datePicker");
}
public void showTimePickerDialog(View v) {
DialogFragment newFragment = new TimePickerFragment();
newFragment.show(getFragmentManager(), "timePicker");
}
//*******************************************//
//DATE PICKER CLASS
public static class DatePickerFragment extends DialogFragment
implements DatePickerDialog.OnDateSetListener {
@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(), (DatePickerDialog.OnDateSetListener)getActivity(), year, month, day);
}
public void onDateSet(DatePicker view, int year, int month, int day) {
// Do something with the date chosen by the user
String date =Integer.toString(day)+"/"+Integer.toString(month)+"/"+Integer.toString(yeat);
dateView.setText(date);
}
}
//*******************************************//
//TIME PICKER CLASS
public static class TimePickerFragment extends DialogFragment
implements TimePickerDialog.OnTimeSetListener {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current time as the default values for the picker
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
// Create a new instance of TimePickerDialog and return it
return new TimePickerDialog(getActivity(), this, hour, minute,
DateFormat.is24HourFormat(getActivity()));
}
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
// Do something with the time chosen by the user
}
}
}
我想设置dateView和timeView（都是TextView）来显示用户选择的日期和时间，但问题是我在onDateSet和onTimeSet方法中无法做任何事情，因为它们是静态的。
在onDateSet（）中：
String date = Integer.toString（day）+“/”+ Integer.toString（month）+“/”+ Integer.toString（yeat）; dateView.setText（日期）;
这给出了无法从静态上下文引用非静态字段dateView的错误。怎么解决这个问题。我查找了类似的问题，但它们都只是DatePickerFragment而不是同一个类中的日期和时间。 这是我的布局XML：
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="showDatePickerDialog"
android:text="@string/date_button_set"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<TextView
android:id="@+id/dateTextID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/date_selected"
android:textAppearance="?android:attr/textAppearanceMedium"
android:layout_alignBottom="@+id/button1"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="54dp"
android:layout_marginStart="54dp" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="showTimePickerDialog"
android:layout_alignLeft="@+id/button1"
android:layout_alignStart="@+id/button1"
android:layout_below="@+id/button1"
android:text="@string/time_button_set" />
<TextView
android:id="@+id/timeTextID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button"
android:layout_alignLeft="@+id/dateTextID"
android:layout_alignStart="@+id/dateTextID" />
</RelativeLayout>
答案 0 :(得分：1)
使用界面将设定的日期和时间传达回活动。
public class MainActivity extends FragmentActivity implements
DatePickerFragment.DatePickedListener, TimePickerFragment.TimePickedListener {
TextView dateView, timeView;
String date;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dateView = (TextView) findViewById(R.id.dateTextID);
timeView = (TextView) findViewById(R.id.timeTextID);
}
public void showDatePickerDialog(View v) {
DialogFragment newFragment = new DatePickerFragment();
newFragment.show(getFragmentManager(), "datePicker");
}
public void showTimePickerDialog(View v) {
DialogFragment newFragment = new TimePickerFragment();
newFragment.show(getFragmentManager(), "timePicker");
}
@Override
public void onDatePicked(String date) {
dateView.setText(date);
}
@Override
public void onTimeSet(String time) {
timeView.setText(time);
}
}
DatePicker类
public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
private static final String TAG = "DatePickerFragment";
private SimpleDateFormat dateFormatterEntry = new SimpleDateFormat("M/dd/yyyy");
private Calendar calendar;
int year;
int month;
int day;
private DatePickedListener listener;
public static interface DatePickedListener {
void onDatePicked(String date);
}
@Override
@NonNull
public Dialog onCreateDialog(Bundle savedInstanceState) {
Log.i(TAG, "onCreateDialog");
calendar = Calendar.getInstance();
year = calendar.get(Calendar.YEAR);
month = calendar.get(Calendar.MONTH);
day = calendar.get(Calendar.DAY_OF_MONTH);
listener = (DatePickedListener) getActivity();
return new DatePickerDialog(getActivity(), this, year, month, day);
}
@Override
public void onDateSet(DatePicker view, int year, int month, int day) {
calendar.set(year, month, day, 0, 0);
String formattedDate = dateFormatterEntry.format(calendar.getTime());
Log.i(TAG, formattedDate);
listener.onDatePicked(formattedDate);
}
}
对TimePicker执行相同操作并添加界面
public class TimePickerFragment extends DialogFragment
implements TimePickerDialog.OnTimeSetListener {
private TimePickedListener listener;
public static interface TimePickedListener {
void onTimePicked(String time);
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current time as the default values for the picker
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
// Create a new instance of TimePickerDialog and return it
return new TimePickerDialog(getActivity(), this, hour, minute,
DateFormat.is24HourFormat(getActivity()));
}
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
listener.onDatePicked(Integer.toString(hourOfDay));
}
}
答案 1 :(得分：0)
您可以定义静态TextView（我知道它会导致内存泄漏）和onDateSet方法获取Date并将其设置为textview
答案 2 :(得分：0)
时间选择器
final Calendar getDate = Calendar.getInstance();
TimePickerDialog timePickerDialog = new TimePickerDialog(context, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
getDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
getDate.set(Calendar.MINUTE, minute);
SimpleDateFormat timeformat=new SimpleDateFormat("HH:mm a");
timeFormat.format(getDate.getTime()));
}
}, getDate.get(Calendar.HOUR_OF_DAY), getDate.get(Calendar.MINUTE), false);
timePickerDialog.show()
日期选择器
final Calendar getDate = Calendar.getInstance();
DatePickerDialog datePickerDialog = new DatePickerDialog(context, new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
getDate.set(year, monthOfYear, dayOfMonth);
SimpleDateFormat format=new SimpleDateFormat("dd-MM-yyyy");
format.format(getDate.getTime());
}
}, getDate.get(Calendar.YEAR),
getDate.get(Calendar.MONTH),
getDate.get(Calendar.DAY_OF_MONTH));
datePickerDialog.show();