Question

首先我经历了一些基本的android教程，我尝试做DatePicker应用程序。当我选择日期时，所选日期将显示在第一个DateView下面的第一个TextView中。它对我来说很好。但是我需要再添加一个DatePicker。当我选择第二个DatePicker时，如果我给我的选择已完成，那么它会更改第一个TextView。我需要在第二个TextView中进行更改。请帮我解决这个问题。

这是我的xml文件。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ScrollView
    android:id="@+id/scrollView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="414dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="66dp"
        android:orientation="vertical" >
<Button
    android:id="@+id/btnChangeDate"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Start Date" />

<TextView
    android:id="@+id/tvDate"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text=""
    android:textAppearance="?android:attr/textAppearanceLarge" />

<DatePicker
    android:id="@+id/dpResult"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

<Button
    android:id="@+id/btnChangeDate1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="End Date" />

 <DatePicker
    android:id="@+id/dpResult1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

 <TextView
     android:id="@+id/tvDate1"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
      />
</LinearLayout>
</ScrollView>
</LinearLayout>

这是我的活动代码。

public class MainActivity extends Activity {
private TextView tvDisplayDate,tvDate1;
private DatePicker dpResult,dpResult1;
private Button btnChangeDate,btnChangeDate1;

private int year;
private int month;
private int day;

static final int DATE_DIALOG_ID = 999;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    setCurrentDateOnView();
    addListenerOnButton();
    setCurrentDateOnView1();
    addListenerOnButton1();

}

// display current date
public void setCurrentDateOnView() {

    tvDisplayDate = (TextView) findViewById(R.id.tvDate);
    dpResult = (DatePicker) findViewById(R.id.dpResult);

    final Calendar c = Calendar.getInstance();
    year = c.get(Calendar.YEAR);
    month = c.get(Calendar.MONTH);
    day = c.get(Calendar.DAY_OF_MONTH);

    // set current date into textview
    tvDisplayDate.setText(new StringBuilder()
        // Month is 0 based, just add 1
        .append(month + 1).append("-").append(day).append("-")
        .append(year).append(" "));

    // set current date into datepicker
    dpResult.init(year, month, day, null);

}

public void addListenerOnButton() {

    btnChangeDate = (Button) findViewById(R.id.btnChangeDate);

    btnChangeDate.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            showDialog(DATE_DIALOG_ID);

        }

    });

}

public void setCurrentDateOnView1() {

    tvDate1 = (TextView) findViewById(R.id.tvDate);
    dpResult1 = (DatePicker) findViewById(R.id.dpResult1);

    final Calendar c = Calendar.getInstance();
    year = c.get(Calendar.YEAR);
    month = c.get(Calendar.MONTH);
    day = c.get(Calendar.DAY_OF_MONTH);

    // set current date into textview
    tvDate1.setText(new StringBuilder()
        // Month is 0 based, just add 1
        .append(month + 1).append("-").append(day).append("-")
        .append(year).append(" "));

    // set current date into datepicker
    dpResult1.init(year, month, day, null);

}

public void addListenerOnButton1() {

    btnChangeDate1 = (Button) findViewById(R.id.btnChangeDate1);

    btnChangeDate1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            showDialog(DATE_DIALOG_ID);

        }

    });

}

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) { 
    case DATE_DIALOG_ID:
       // set date picker as current date
       return new DatePickerDialog(this, datePickerListener, 
                     year, month,day);
    }
    return null;
}

private DatePickerDialog.OnDateSetListener datePickerListener 
            = new DatePickerDialog.OnDateSetListener() {

    // when dialog box is closed, below method will be called.
    public void onDateSet(DatePicker view, int selectedYear,
            int selectedMonth, int selectedDay) {
        year = selectedYear;
        month = selectedMonth;
        day = selectedDay;

        // set selected date into textview
        tvDisplayDate.setText(new StringBuilder().append(month + 1)
           .append("-").append(day).append("-").append(year)
           .append(" "));

        // set selected date into datepicker also
        dpResult.init(year, month, day, null);

    }
};

提前致谢。

Answer 1

在此功能tvDate1 = (TextView) findViewById(R.id.tvDate);

中查看您的第public void setCurrentDateOnView1()行

您创建了一个变量tvdate但是您使用了第一个TextView的ID，因此请更改此

tvDate1 = (TextView) findViewById(R.id.tvDate);

到

tvDate1 = (TextView) findViewById(R.id.tvDate1);

修改

你只有一个监听器，他使用变量tvDisplayDate。因此，将日期设置为第一个TextView。你需要使用2个监听器而不是两个监听器。

Answer 2

添加另一个对话框ID，如：

static final int DATE_DIALOG_ID_2 = 998;

并添加第二个按钮，如：

tvDisplayDate1 = (TextView) findViewById(R.id.tvDate1);

然后在你的第二个按钮上执行此操作：

  btnChangeDate1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                showDialog(DATE_DIALOG_ID_2 );

            }

        });

然后：

 protected Dialog onCreateDialog(int id) {
    switch (id) { 
    case DATE_DIALOG_ID:
       // set date picker as current date
       return new DatePickerDialog(this, datePickerListener, 
                     year, month,day);
      case DATE_DIALOG_ID_2:
       // set date picker as current date
       return new DatePickerDialog(this, datePickerListener2, 
                     year, month,day);

    }
    return null;
}

然后

private DatePickerDialog.OnDateSetListener datePickerListener2 
            = new DatePickerDialog.OnDateSetListener() {

public void onDateSet(DatePicker view, int selectedYear,
        int selectedMonth, int selectedDay) {
    year = selectedYear;
    month = selectedMonth;
    day = selectedDay;

    // set selected date into textview
    tvDisplayDate1.setText(new StringBuilder().append(month + 1)
       .append("-").append(day).append("-").append(year)
       .append(" "));

    // set selected date into datepicker also
    dpResult1.init(year, month, day, null);

}
};

希望这有帮助

如何在android中添加两个日期选择器？

2 个答案: