我的应用中有4个timePicker。当用户双击timePicker时，将弹出editText对话框。但有时当我不小心点击两次以上时，应用程序崩溃并说已经添加了片段。我怎样才能解决这个问题？由于点击了editText两次，我希望只需点击editText即可显示timePicker对话框。
public void onClick(View v) {
int id = v.getId();
if (id == R.id.editTextTI1) {
tp.setFlag(TimePick.FLAG_START_DATE);
FragmentTransaction ft = getFragmentManager().beginTransaction();
tp.show(ft, "TimePicker");
}
if (id == R.id.editTextTO1) {
tp.setFlag(TimePick.FLAG_END_DATE);
FragmentTransaction ft = getFragmentManager().beginTransaction();
tp.show(ft, "TimePicker");
}
if (id == R.id.editTextTI2) {
tp.setFlag(TimePick.FLAG_START_DATE1);
FragmentTransaction ft = getFragmentManager().beginTransaction();
tp.show(ft, "TimePicker");
}
if (id == R.id.editTextTO2) {
tp.setFlag(TimePick.FLAG_END_DATE1);
FragmentTransaction ft = getFragmentManager().beginTransaction();
tp.show(ft, "TimePicker");
}
if (id == R.id.editTextTI3) {
tp.setFlag(TimePick.FLAG_START_DATE2);
FragmentTransaction ft = getFragmentManager().beginTransaction();
tp.show(ft, "TimePicker");
}
if (id == R.id.editTextTO3) {
tp.setFlag(TimePick.FLAG_END_DATE2);
FragmentTransaction ft = getFragmentManager().beginTransaction();
tp.show(ft, "TimePicker");
}
if (id == R.id.editTextTI4) {
tp.setFlag(TimePick.FLAG_START_DATE3);
FragmentTransaction ft = getFragmentManager().beginTransaction();
tp.show(ft, "TimePicker");
}
if (id == R.id.editTextTO4) {
tp.setFlag(TimePick.FLAG_END_DATE3);
FragmentTransaction ft = getFragmentManager().beginTransaction();
tp.show(ft, "TimePicker");
}
}
public static class TimePick extends android.app.DialogFragment implements TimePickerDialog.OnTimeSetListener {
public static final int FLAG_START_DATE = 00;
public static final int FLAG_END_DATE = 01;
public static final int FLAG_START_DATE1 = 10;
public static final int FLAG_END_DATE1 = 11;
public static final int FLAG_START_DATE2 = 20;
public static final int FLAG_END_DATE2 = 21;
public static final int FLAG_START_DATE3 = 30;
public static final int FLAG_END_DATE3 = 31;
private int flag = 00;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
return new TimePickerDialog(getActivity(), this, hour, minute, DateFormat.is24HourFormat(getActivity()));
}
public void setFlag(int i) {
flag = i;
}
@Override
public void onTimeSet(TimePicker view, int hourofDay, int minute) {
if (flag == FLAG_START_DATE) {
start.setText(Integer.toString(hourofDay) + ":" + Integer.toString(minute));
b = start.getText().toString();
}
if (flag == FLAG_END_DATE) {
end.setText(Integer.toString(hourofDay) + ":" + Integer.toString(minute));
c = end.getText().toString();
}
if (flag == FLAG_START_DATE1) {
start1.setText(Integer.toString(hourofDay) + ":" + Integer.toString(minute));
d = start1.getText().toString();
}
if (flag == FLAG_END_DATE1) {
end1.setText(Integer.toString(hourofDay) + ":" + Integer.toString(minute));
e1 = end1.getText().toString();
}
if (flag == FLAG_START_DATE2) {
start2.setText(Integer.toString(hourofDay) + ":" + Integer.toString(minute));
f = start2.getText().toString();
}
if (flag == FLAG_END_DATE2) {
end2.setText(Integer.toString(hourofDay) + ":" + Integer.toString(minute));
g = end2.getText().toString();
}
if (flag == FLAG_START_DATE3) {
start3.setText(Integer.toString(hourofDay) + ":" + Integer.toString(minute));
h = start3.getText().toString();
}
if (flag == FLAG_END_DATE3) {
end3.setText(Integer.toString(hourofDay) + ":" + Integer.toString(minute));
i = end3.getText().toString();
}
LogCat错误
10-15 12:53:17.113 7943-7943/com.example.project.project E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.project.project, PID: 7943
java.lang.IllegalStateException: Fragment already added: TimePick{7c7eb96 #0 TimePicker}
at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1219)
at android.app.BackStackRecord.run(BackStackRecord.java:715)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1535)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:482)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
答案 0 :(得分：2)
您的代码是如此硬编码且不易扩展，这可能会导致将来出现许多错误。 您应该尽可能地将通用逻辑封装为最大值，因此在当前情况下：
public void onClick(View v) {
EditText editText = (EditText) v;
if (tp==null || !tp.isAdded()){
FragmentTransaction ft = getFragmentManager().beginTransaction();
tp = new TimePick(editText);
tp.show(ft, "TimePicker");
}
}
@Override
public void onStop() {
super.onStop();
if (tp.isAdded()) tp.dismiss();
}
public static class TimePick extends android.app.DialogFragment implements TimePickerDialog.OnTimeSetListener {
private EditText editText;
public TimePick(EditText editText) {
this.editText = editText;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
return new TimePickerDialog(getActivity(), this, hour, minute, DateFormat.is24HourFormat(getActivity()));
}
@Override
public void onTimeSet(TimePicker view, int hourofDay, int minute) {
editText.setText(Integer.toString(hourofDay) + ":" + Integer.toString(minute));
}
}
如果屏幕上有任何代码，此代码将不会尝试创建新的时间选择器。您可以将目标edittext传递给timePicker片段。当您需要来自这些edittexts（a，b，c，d ......变量）的值时，您可以在需要时读取它，而不是在onTimeSetMethod中读取。
onStop方法用于处理活动娱乐案例。在这里，我只是隐藏活跃的时间戳。
答案 1 :(得分：1)
您要添加相同的DialogFragment个实例两次，要解决此问题，请检查TimePicker是否添加了getFragmentManager.findFragmentByTag("TimePicker")。