我对 Android 平台完全陌生，并且在学习开发过程的同时一直在构建应用程序。
目前，我正在开展一项需要部署 2 个日期选择器的活动。一个是“开始日期”，另一个是“结束日期”。我一直在关注 android 开发者页面上的 DatePicker 教程：http: //developer.android.com/resources/tutorials/views/hello-datepicker.html
对于一个 DatePicker，它工作得很好。
现在我的问题是，当我为第二个日期选择器复制整个过程时，它在模拟器和手机上都显示得很好。但是，无论我按下哪个按钮来选择日期，只有第一个 TextView 被更新，第二个 TextView 继续显示当前日期。
这是代码：
package com.datepicker;
import java.util.Calendar;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
public class datepicker extends Activity {
private TextView mDateDisplay;
private TextView endDateDisplay;
private Button mPickDate;
private Button endPickDate;
private int mYear;
private int mMonth;
private int mDay;
static final int START_DATE_DIALOG_ID = 0;
static final int END_DATE_DIALOG_ID = 0;
/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/* capture our View elements for the start date function */
mDateDisplay = (TextView) findViewById(R.id.startdateDisplay);
mPickDate = (Button) findViewById(R.id.startpickDate);
/* add a click listener to the button */
mPickDate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showDialog(START_DATE_DIALOG_ID);
}
});
/* get the current date */
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay = c.get(Calendar.DAY_OF_MONTH);
/* display the current date (this method is below) */
updateStartDisplay();
/* capture our View elements for the end date function */
endDateDisplay = (TextView) findViewById(R.id.enddateDisplay);
endPickDate = (Button) findViewById(R.id.endpickDate);
/* add a click listener to the button */
endPickDate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showDialog(END_DATE_DIALOG_ID);
}
});
/* get the current date */
final Calendar c1 = Calendar.getInstance();
mYear = c1.get(Calendar.YEAR);
mMonth = c1.get(Calendar.MONTH);
mDay = c1.get(Calendar.DAY_OF_MONTH);
/* display the current date (this method is below) */
updateEndDisplay();
}
private void updateEndDisplay() {
endDateDisplay.setText(
new StringBuilder()
// Month is 0 based so add 1
.append(mMonth + 1).append("-")
.append(mDay).append("-")
.append(mYear).append(" "));
}
private void updateStartDisplay() {
mDateDisplay.setText(
new StringBuilder()
// Month is 0 based so add 1
.append(mMonth + 1).append("-")
.append(mDay).append("-")
.append(mYear).append(" "));
}
/* 当用户在对话框中为开始日期函数“设置”日期时收到的回调 */
private DatePickerDialog.OnDateSetListener mDateSetListener =
new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
updateStartDisplay();
}
};
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case START_DATE_DIALOG_ID:
return new DatePickerDialog(this,
mDateSetListener,
mYear, mMonth, mDay);
}
return null;
}
/* the callback received when the user "sets" the date in the dialog for the end date function */
private DatePickerDialog.OnDateSetListener endDateSetListener =
new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
updateStartDisplay();
}
};
protected Dialog onCreateDialog1(int id) {
switch (id) {
case END_DATE_DIALOG_ID:
return new DatePickerDialog(this,
endDateSetListener,
mYear, mMonth, mDay);
}
return null;
}
}
请告知代码所需的更改。
