Question

public void setCurrenttime () {

    c = Calendar.getInstance(); 
    hour = c.get(Calendar.HOUR_OF_DAY);
    min = c.get(Calendar.MINUTE);
    String am_pm;
    if (hour > 12) {              
        am_pm = "PM";
    } else {
        am_pm = "AM";
    }

    tvDisplayHour=(TextView)findViewById(R.id.hourtext);   
    tvDisplayHour.setText(hour+":"+ min + " "+ am_pm );     
}

我的问题是它不会在我的模拟器中设置当前时间。

该代码有什么问题？请帮助我是android的新手。

谢谢

public void setCurrenttime () {

    c = Calendar.getInstance(); 
    hour = c.get(Calendar.HOUR_OF_DAY);
    min = c.get(Calendar.MINUTE);
    String am_pm;
    if (hour > 12) {              
        am_pm = "PM";
    } else {
        am_pm = "AM";
    }

    tvDisplayHour=(TextView)findViewById(R.id.hourtext);   
    tvDisplayHour.setText(hour+":"+ min + " "+ am_pm );     
}

在此代码中我如何转换为12小时格式？

Answer 1

您正在使用的代码是从系统中获取时间而不是为系统设置时间。如果要将时间设置为System，则需要使用AlarmManager类。检查以下代码，

Calendar c = Calendar.getInstance();
c.set(2014, 8, 15, 12, 34, 56);
AlarmManager am = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);
am.setTime(c.getTimeInMillis());

您还需要在AndroidManifest.xml文件中定义以下权限

<permission android:name="android.permission.SET_TIME"
    android:protectionLevel="signature|system"
    android:label="@string/permlab_setTime"
    android:description="@string/permdesc_setTime" />

Answer 2

试试这个：您将获得当前时间： -

根据您的要求修改它： -

 public void current_time() {

        Calendar cal = Calendar.getInstance();
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minute = cal.get(Calendar.MINUTE);
        int am_pm = cal.get(Calendar.AM_PM);

        TimePickerDialog mTimePicker;
        mTimePicker = new TimePickerDialog(InformationActivity.this,
                new TimePickerDialog.OnTimeSetListener() {
                    @Override
                    public void onTimeSet(TimePicker timePicker,
                            int selectedHour, int selectedMinute) {

                        String minutes = "";

                        int startTimeHour = selectedHour;
                        int startTimeMinute = selectedMinute;

                        if (selectedMinute < 10) {
                            minutes = "0" + selectedMinute;
                        } else {
                            minutes = String.valueOf(selectedMinute);
                        }

                        if (selectedHour > 12) {
                            selectedHour -= 12;

                            String timeSet_in = "PM";
                            edt_time_in.setText(selectedHour + ":" + minutes
                                    + " " + timeSet_in.toString());
                            selectedHour += 12;

                        } else if (selectedHour == 0) {

                            selectedHour += 12;

                            timeSet_in = "AM";
                            edt_time_in.setText(selectedHour + ":" + minutes
                                    + " " + timeSet_in.toString());
                            selectedHour -= 12;
                        } else if (selectedHour == 12) {

                            timeSet_in = "PM";
                            edt_time_in.setText(selectedHour + ":" + minutes
                                    + " " + timeSet_in.toString());
                        } else {

                            timeSet_in = "AM";
                            edt_time_in.setText(selectedHour + ":" + minutes
                                    + " " + timeSet_in.toString());
                        }

                        arriveLoadHour = selectedHour;
                        arriveLoadMinute = selectedMinute;

                    }
                }, hour, minute, true);// Yes 24 hour time
        mTimePicker.setTitle("Select Time");
        mTimePicker.show();

    }

在android中设置当前时间

2 个答案: