我正在尝试创建一个从用户那里获取日期和时间的应用，当该特定日期和时间到来时，用户应该收到通知，应用应该自行启动。 首先我的代码只工作一天（意味着一天的压缩日） 我不知道如何在几天内进行计算，就像用户从现在开始选择3天一样。 所以请帮忙 这是我的所有代码
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="34dp"
android:layout_marginTop="58dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/et_date"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:focusable="false"
android:hint="select date"
android:padding="10dp"
android:singleLine="true"
android:textColor="#000000"
android:textSize="15sp" />
<EditText
android:id="@+id/et_time"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:focusable="false"
android:hint="select time"
android:padding="10dp"
android:singleLine="true"
android:textColor="#000000"
android:textSize="15sp" />
<Button
android:id="@+id/btn_setTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:text="submit"
android:textColor="#ffffff" />
我的主要活动
公共类MainActivity扩展了Activity {
TextView text1;
EditText et_date, et_time;
int mYear, mMonth, mDay, mMinute, mHour; // selected date time
Button btn_setTime;
int Hour, Minute, hourDiff, minDiff, cday, cmonth, cyear; // current time
String date;
private static final String FORMAT = "%02d:%02d:%02d";
int seconds, minutes;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text1 = (TextView) findViewById(R.id.textView1);
et_date = (EditText) findViewById(R.id.et_date);
et_time = (EditText) findViewById(R.id.et_time);
btn_setTime = (Button) findViewById(R.id.btn_setTime);
et_date.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// To show current date in the datepicker
Calendar mcurrentDate = Calendar.getInstance();
mYear = mcurrentDate.get(Calendar.YEAR);
mMonth = mcurrentDate.get(Calendar.MONTH);
mDay = mcurrentDate.get(Calendar.DAY_OF_MONTH);
DatePickerDialog mDatePicker = new DatePickerDialog(
MainActivity.this, new OnDateSetListener() {
public void onDateSet(DatePicker datepicker,
int selectedyear, int selectedmonth,
int selectedday) {
/* Your code to get date and time */
mYear = selectedyear;
mMonth = selectedmonth;
mDay = selectedday;
et_date.setText(new StringBuilder()
// Month is 0 based so add 1
.append(mDay).append("-")
.append(mMonth + 1).append("-")
.append(mYear));
}
}, mYear, mMonth, mDay);
mDatePicker.getDatePicker().setMinDate(
System.currentTimeMillis() - 1000);
mDatePicker.setTitle("Select date");
mDatePicker.show();
}
});
et_time.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Calendar mcurrentTime = Calendar.getInstance();
int hour = mcurrentTime.get(Calendar.HOUR_OF_DAY);
int minute = mcurrentTime.get(Calendar.MINUTE);
TimePickerDialog mTimePicker;
mTimePicker = new TimePickerDialog(MainActivity.this,
new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker,
int selectedHour, int selectedMinute) {
// String format = "";
// if (selectedHour == 0) {
// selectedHour += 12;
// format = "AM";
// } else if (selectedHour == 12) {
// format = "PM";
// } else if (selectedHour > 12) {
// selectedHour -= 12;
// format = "PM";
// } else {
// format = "AM";
// }
mHour = selectedHour;
mMinute = selectedMinute;
et_time.setText(new StringBuilder()
.append(selectedHour).append(" : ")
.append(selectedMinute));
}
}, hour, minute, true);// Yes 24 hour time
mTimePicker.setTitle("Select Time");
mTimePicker.show();
}
});
btn_setTime.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
// if(et_date)
Calendar cal = Calendar.getInstance();
Hour = cal.get(Calendar.HOUR_OF_DAY);
Minute = cal.get(Calendar.MINUTE);
cday = cal.get(Calendar.DATE);
cmonth = cal.get(Calendar.MONTH);
cyear = cal.get(Calendar.YEAR);
int dday, dmonth, dyear;
dday = mDay - cday;
dmonth = mMonth - cmonth;
dyear = mYear - cyear;
if (dyear == 0) {
if (dmonth == 0) {
if (dday == 0) {
// for current day.. calculate only time!
long CurrentMilli = (mHour * 3600 * 1000)
+ (mMinute * 60 * 1000);
long SelectedMilli = (Hour * 3600 * 1000)
+ (Minute * 60 * 1000);
long diff = CurrentMilli - SelectedMilli;
new CountDownTimer(diff, 1000) { // adjust the milli
// seconds
// here
public void onTick(long millisUntilFinished) {
text1.setText(""
+ String.format(
FORMAT,
TimeUnit.MILLISECONDS
.toHours(millisUntilFinished),
TimeUnit.MILLISECONDS
.toMinutes(millisUntilFinished)
- TimeUnit.HOURS
.toMinutes(TimeUnit.MILLISECONDS
.toHours(millisUntilFinished)),
TimeUnit.MILLISECONDS
.toSeconds(millisUntilFinished)
- TimeUnit.MINUTES
.toSeconds(TimeUnit.MILLISECONDS
.toMinutes(millisUntilFinished))));
}
public void onFinish() {
text1.setText("done!");
}
}.start();
} else {
Toast.makeText(getApplicationContext(),
"inside current day's else",
Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(),
"inside current month's else",
Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(),
"inside current year's else", Toast.LENGTH_SHORT)
.show();
}
}
});
}
}