我正在尝试将Time Picker对话框放在时间选择器上方的CheckBox中,如果它已经检查了Time Picker将工作。
我已经在TimePickerFragment(onCreateDialog)中创建了CheckBox它将复选框放在主活动中,而不是在时间对话框中。
TimePickerFragment:
public class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener {
private MyAlarmReceiver alarm;
//final CheckBox chk=null;
@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);
final CheckBox chk = (CheckBox) getActivity().findViewById(R.id.chk);
if (chk.isChecked()) {
chk.setChecked(false);
}
// 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) {
Context con = getActivity();
MainActivity.hour = hourOfDay;
MainActivity.min = minute;
//Toast.makeText(con, "TimeGet: "+MainActivity.hour+","+MainActivity.min, Toast.LENGTH_LONG).show();
alarm = new MyAlarmReceiver();
if(alarm != null){alarm.setOnetimeTimer(con);}
else
Toast.makeText(con, "Alarm is null", Toast.LENGTH_SHORT).show();
}
}
Main_activity.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"
android:id="@+id/layout"
android:background="@drawable/back" >
<CheckBox
android:id="@+id/chk"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/chk"
android:checked="true"/>
</RelativeLayout>
知道为什么吗?谢谢!
答案 0 :(得分:2)
片段没有findViewById()
方法,因此出错。
由于您似乎想要获取对Activity的Checkbox的引用,因此获取Activity实例然后调用findViewById()
应该会得到所需的结果:
final CheckBox chk = (CheckBox) getActivity().findViewById(R.id.chk);
if (chk.isChecked()) {
chk.setChecked(false);
}
正如ChriZzZ所提到的,无法访问的代码是您应该遇到的另一个编译器错误。
答案 1 :(得分:0)
我很确定你会收到一条警告/错误:无法访问的代码。
您返回并因此在您到达findViewById之前离开该方法。
// Create a new instance of TimePickerDialog and return it
return new TimePickerDialog(getActivity(), this, hour, minute,
DateFormat.is24HourFormat(getActivity()));
final CheckBox chk = (CheckBox) findViewById(R.id.chk);