無法在Android中創建DatePicker

Question

我剛剛編寫了一個Android程序，它包含在DatePicker中，但它不起作用。

Java代碼：

public class MainActivity extends Activity { 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 

     CurDateTv2 = (TextView)findViewById(R.id.textView2); 
     Picker = (DatePicker)findViewById(R.id.calendarView1); 
     btnChangeDate = (Button)findViewById(R.id.button1); 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     final Calendar c = Calendar.getInstance(); 
      int year = c.get(Calendar.YEAR); 
      int month = c.get(Calendar.MONTH); 
      int day = c.get(Calendar.DAY_OF_MONTH); 
      Picker.init(year, month,day, onChangedListener()) 
      } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 


    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 

     int id = item.getItemId(); 
     if (id == R.id.action_settings) 
      return true; 

     return super.onOptionsItemSelected(item); 
    } 
    public void onDateChangedListener(DatePicker view, int year, int monthOfYear, int dayOfMonth) { 
     CurDateTv2.setText(new String Builder() 
       .append(dayOfMonth).append("/").append(monthOfYear + 1) 
       .aapend("/").append(year).append(" ")); 

    } 
} 

而且佈局

<LinearLayout 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:orientation="vertical" > 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Change Date" /> 

     <TextView 
      android:id="@+id/textView1" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Current Date" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      /> 

      <TextView 
       android:id="@+id/textView2" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="08/08/2016" 
       android:textAppearance="?android:attr/textAppearanceLarge" 
       /> 

<CalendarView 
       android:id="@+id/calendarView1" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
/> 

    </LinearLayout> 

不幸的是，我不知道Java的非常好，所以我不能識別錯誤所在。
我真的希望你能幫助我。

Answer 1

考慮使用的日期和時間選擇一個DialogFragment類，使其在整個應用程序，並輕鬆應對撿拾工具可用..

見這位官員developers.android指南：

https://developer.android.com/guide/topics/ui/controls/pickers.html

Answer 2

這不是必需的CalenderView。這是可能的編輯文本。

參見：

http://androidopentutorials.com/android-datepickerdialog-on-edittext-click-event/

Answer 3

  //Initialize the variables 
      Calendar myCalendar = Calendar.getInstance(); 
      DatePickerDialog.OnDateSetListener date; 
      DatePickerDialog d1; 



       //To be written in oncreate method 

     //define 
     date = new DatePickerDialog.OnDateSetListener() { 
      @Override 
      public void onDateSet(DatePicker view, int year, int monthOfYear, 
            int dayOfMonth) { 
       // TODO Auto-generated method stub 
       myCalendar.set(Calendar.YEAR, year); 
       myCalendar.set(Calendar.MONTH, monthOfYear); 
       myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth); 

     //It is a function that sets the value to the edittext after selection 
       updateLabel(); 
      } 
     }; 


    //onClick listener to the button which open the calendar 
    fromDate.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      d1= new DatePickerDialog(className.this, date, myCalendar 
        .get(Calendar.YEAR), myCalendar.get(Calendar.MONTH), 
        myCalendar.get(Calendar.DAY_OF_MONTH)); 
      d1.show(); 
     } 
    }); 

    //finally the function 
    private void updateLabel() { 
     String myFormat = "MM/dd/yy"; //In which you need put here 
     SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US); 

    //Display the selection 
     fromDateEdit.setText(sdf.format(myCalendar.getTime())); 
    }