Question

在我的程序中我希望在获取当前日期之后从用户获取当前日期文本视图想要在100天后自动显示所选日期。

第一次运行我的应用程序时，我选择 15-12-2015 文本视图显示 24-03-2016 自动。

当我将日期更改为下一个3天即我选择 18-12-2015 时，文本视图显示相同的日期（ 24-03-2016 ）< / p>

这是我的代码： Activity.xml

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/editText"
    android:layout_below="@id/textView"
    android:editable="false"
   android:hint="Select the Date "
    />

<Button
    android:layout_width="50px"
    android:layout_height="50px"
    android:layout_below="@+id/textView"
    android:layout_toRightOf="@+id/editText"
    android:background="@drawable/calender"
    android:layout_alignBottom="@+id/editText"
    android:layout_alignRight="@+id/textView"
    android:layout_alignEnd="@+id/textView"
    android:id="@+id/button"
    />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="Large Text"
    android:id="@+id/textView3"
    android:layout_below="@+id/editText"
    android:layout_centerHorizontal="true" />

MainActivity.java

public class MainActivity extends ActionBarActivity implements View.OnClickListener {
    private Button ib;
    private Calendar cal;
    private int day;
    private int month;
    private int year;
    private EditText et;
    private TextView display;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ib = (Button) findViewById(R.id.button);
        cal = Calendar.getInstance();
        day = cal.get(Calendar.DAY_OF_MONTH);
        month = cal.get(Calendar.MONTH);
        year = cal.get(Calendar.YEAR);
        et = (EditText) findViewById(R.id.editText);
        display = (TextView) findViewById(R.id.textView3);
        ib.setOnClickListener((View.OnClickListener) this);

    }
@Override
    public void onClick(View v) {
        showDialog(0);
    }
    @Override
    @Deprecated
    protected Dialog onCreateDialog(int id) {
        return new DatePickerDialog(this, datePickerListener, year, month, day);
    }

    private DatePickerDialog.OnDateSetListener datePickerListener = new DatePickerDialog.OnDateSetListener() {
        public void onDateSet(DatePicker view, int selectedYear,
                              int selectedMonth, int selectedDay) {
             et.setText(selectedDay + " / " + (selectedMonth + 1) + " / "
                    + selectedYear);
 SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
            Calendar c = Calendar.getInstance();
           // c.setTime(dtStartDate);
            c.add(Calendar.DATE, 100);  // number of days to add
            String dt = sdf.format(c.getTime());  // dt is now the new date
            display.setText(dt);
        }
    };

Answer 1

试试这个： -

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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="70dp"
        android:onClick="setDate"
        android:text="@string/date_button_set" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="24dp"
        android:text="@string/date_label_set"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
        android:layout_marginTop="66dp"
        android:layout_toLeftOf="@+id/button1"
        android:text="@string/date_view_set"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/button1"
        android:layout_below="@+id/textView2"
        android:layout_marginTop="72dp"
        android:text="@string/date_selected"
        android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>

mainactivity.java： -

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.support.v4.app.DialogFragment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {
    private DatePicker datePicker;
    private Calendar calendar;
    private TextView dateView;
    private int year, month, day;

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

        dateView = (TextView) findViewById(R.id.textView3);
        calendar = Calendar.getInstance();
        year = calendar.get(Calendar.YEAR);

        month = calendar.get(Calendar.MONTH);
        day = calendar.get(Calendar.DAY_OF_MONTH);
        showDate(year, month + 1, day);
    }
    @SuppressWarnings("deprecation")
    public void setDate(View view) {
        showDialog(999);
        Toast.makeText(getApplicationContext(), "ca", Toast.LENGTH_SHORT)
                .show();
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        // TODO Auto-generated method stub
        if (id == 999) {
            return new DatePickerDialog(this, myDateListener, year, month, day);
        }
        return null;
    }

    private DatePickerDialog.OnDateSetListener myDateListener = new DatePickerDialog.OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker arg0, int arg1, int arg2, int arg3) {
            // TODO Auto-generated method stub
            // arg1 = year
            // arg2 = month
            // arg3 = day
            showDate(arg1, arg2+1, arg3);
        }
    };

    private void showDate(int year, int month, int day) {
        dateView.setText(new StringBuilder().append(day).append("/")
                .append(month).append("/").append(year));
    }



}

Answer 2

您没有使用datepicker提供的日期。

试试这个：

long long int

更新：已更改＆＃34; selectedMonth + 1＆＃34; to＆＃34; selectedMonth＆＃34;

使用DatePicker在Android中选择新日期时，日期未更改

2 个答案: