Cách sử dụng DatePickerDialog trong BaseAdapter

Question

Tôi đang làm việc với Lớp BaseAdapter. Tôi muốn hiển thị DatePickerDialog trong đó. Khi tôi sử dụng showDialog(DATE_DIALOG_ID); Tôi gặp lỗi.

Vui lòng hướng dẫn tôi về vấn đề này.

gói com.OrganisemeePhone.adapter;

import java.util.ArrayList; 
import java.util.Vector; 

import android.app.Activity; 
import android.app.DatePickerDialog; 
import android.app.Dialog; 
import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.os.Bundle; 
import android.preference.PreferenceManager; 
import android.provider.OpenableColumns; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.View.OnClickListener; 
import android.widget.BaseAdapter; 
import android.widget.CheckBox; 
import android.widget.CompoundButton; 
import android.widget.DatePicker; 
import android.widget.ImageView; 
import android.widget.TextView; 
import android.widget.CompoundButton.OnCheckedChangeListener; 




public class TaskFilterAdapter extends BaseAdapter { 
    String date, month, year,setdueDate; 
    //int dateFormat; 
    DatePickerDialog.OnDateSetListener dateListener; 

    int myYear, myMonth, myDay; 
    int dateFormat; 
    int starcount=0; 

    public TaskFilterAdapter datedialog; 

    viewholder holder; 
    LayoutInflater inflator; 
    ArrayList<Integer> taskId = new ArrayList<Integer>(); 
    ArrayList<String> task = new ArrayList<String>(); 
    ArrayList<String> dueDate = new ArrayList<String>(); 
    ArrayList<Integer> priority = new ArrayList<Integer>(); 
    static final int DATE_DIALOG_ID = 0; 
    Vector<Boolean> VectorCheckChange = new Vector<Boolean>(); 
    Vector<Object> taskrow = new Vector<Object>(); 

    static int pos; 
    Context context; 
    private boolean isdaymonth; 
    public TaskFilterAdapter(Context context,ArrayList<Integer> taskId, ArrayList<String> task, ArrayList<Integer> priority, ArrayList<String> duedate) { 
     super(); 

     inflator = LayoutInflater.from(context); 
     this.taskId = taskId; 
     this.context=context; 

     this.task = task; 
     this.dueDate = duedate; 
     this.priority = priority; 

     //dateFormat=LoginActivity.db.getdateformat(); 
     getDateFormate(); 
     dateFormat=LoginActivity.db.getdateformat(); 
     getDateFormate(); 
     for(int i=0; i<task.size(); i++) 
     { 
      VectorCheckChange.add(false); 
     } 
    } 


    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return task.size(); 
    } 

    @Override 
    public Object getItem(int arg0) { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    @Override 
    public long getItemId(int arg0) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 


    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 

     if(convertView==null) 
     { 
      holder = new viewholder(); 
      convertView = inflator.inflate(R.layout.task_row, null); 
      holder.task = (TextView)convertView.findViewById(R.id.task_row_text); 
      holder.date = (TextView)convertView.findViewById(R.id.task_row_date_text); 
      holder.star = (ImageView)convertView.findViewById(R.id.task_row_star); 
      holder.chk = (CheckBox)convertView.findViewById(R.id.task_row_check_box); 

      holder.task.setOnClickListener(new Clicker()); 
      holder.chk.setOnCheckedChangeListener(new Checker()); 
      holder.star.setOnClickListener(new Clicker()); 
      holder.date.setOnClickListener(new Clicker()); 

      setviewAsSettings(); 

      setviewAsSettings(); 


      convertView.setTag(holder); 


      } 
     else 
     { 
      holder=(viewholder)convertView.getTag(); 
     } 


     pos = position; 

     /****************** Set Task *************************/ 

     holder.task.setText(task.get(position)); 
     holder.task.setTag(position); 
     holder.star.setTag(position); 
     holder.date.setTag(position); 



     /***************** Set Duedate ***********************/ 

     setdueDate = dueDate.get(position); 

     month = setdueDate.substring(5, 7); 
     date = setdueDate.substring(8, 10); 



     if (!date.equals("00")) 
     { 
      if (isdaymonth) 
      if (isdaymonth) 
      { 
       holder.date.setText(date + "." + month + "."); 
       Log.d("taskList Adapter"," date formate day month "); 

      } 
      else 
      { 
       holder.date.setText(month + "." + date + "."); 
       Log.d("taskList Adapter"," date formate month day"); 

      } 
     } 
     else 
     { 
      holder.date.setText(""); 
     } 



     /***************** Set Priority ***********************/ 


       if (priority.get(position).equals(-1) || priority.get(position).equals(0)|| priority.get(position).equals(3)) 
       { 

        holder.star.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.star_low)); 

       } 
       else if (priority.get(position).equals(2)) 
       { 

        holder.star.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.star_med)); 
       } 
       else if (priority.get(position).equals(1)) 
       { 

        holder.star.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.star_high)); 
       } 




     /******************* Set tag in checkBox ******************************/ 

     holder.chk.setTag(position); 

     if(VectorCheckChange.get(position)) 
     { 
      holder.chk.setChecked(true); 
      holder.task.setPaintFlags(holder.task.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); 
      holder.task.setTextColor(Color.parseColor("#848484")); 
      holder.date.setPaintFlags(holder.task.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); 
      holder.date.setTextColor(Color.parseColor("#848484")); 
      holder.task.setClickable(false); 
      holder.task.setEnabled(false); 
     } 
     else 
     { 
      holder.chk.setChecked(false); 
      holder.task.setPaintFlags(holder.task.getPaintFlags() & ~ Paint.STRIKE_THRU_TEXT_FLAG); 
      holder.task.setTextColor(Color.parseColor("#000000")); 
      holder.date.setPaintFlags(holder.task.getPaintFlags() & ~ Paint.STRIKE_THRU_TEXT_FLAG); 
      holder.date.setTextColor(Color.parseColor("#000000")); 
      holder.task.setClickable(true); 
      holder.task.setEnabled(true); 
     } 


     return convertView; 
    } 
    // updates by nilesh 
    public void setviewAsSettings(){ 
     //check for task setting 
     SharedPreferences startup_pref = 
      PreferenceManager.getDefaultSharedPreferences(context); 

     Boolean viewpriority=startup_pref.getBoolean("viewpriority", true); 
     Boolean viewduedate=startup_pref.getBoolean("viewduedate", true); 

      if(!viewpriority){ 
       holder.star.setVisibility(View.INVISIBLE); 
      }    
      if(!viewduedate){ 
       holder.date.setVisibility(View.INVISIBLE); 
      } 
     //check for task setting completed 
    } 

    public class viewholder 
    { 
     TextView task,date; 
     ImageView star; 
     CheckBox chk; 

    } 


    public class Clicker implements OnClickListener 
    { 


     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 


      int position=(Integer)v.getTag(); 
      int setPriority = 0; 

     if(v.getId() == holder.date.getId()) 
     { 


      Log.i("Date Dialog Picker", "Click Date..................... "); 

      ((Activity)context).showDialog(DATE_DIALOG_ID); 

     //.showDialog(DATE_DIALOG_ID); 


      //.showDialog(DATE_DIALOG_ID); 



      } 
     dateListener = new DatePickerDialog.OnDateSetListener() { 

      @Override 
      public void onDateSet(DatePicker view, int yr, int monthOfYear, 
        int dayOfMonth) { 
       // TODO Auto-generated method stub 
       myYear = yr; 
       myMonth = monthOfYear; 
       myDay = dayOfMonth; 

       } 

      }; 



     if(v.getId() == holder.task.getId()) 
     { 
      Intent display_int= new Intent(context, DisplyTaskActivity.class); 
      display_int.putExtra(constantcode.TASK_ID,taskId.get(position)); 
      v.getContext().startActivity(display_int); 

      Log.i("TaskList Adapter", "Task ....position...... "+holder.star.getTag()); 
     } 


      if(v.getId() == holder.star.getId()) 
      { 

       if (priority.get(position).equals(-1) || priority.get(position).equals(0) || priority.get(position).equals(3)) 
        { 
        priority.set(position, 2); 
        setPriority = 2; 

        holder.star.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.star_low)); 

        Log.d("TaskList Adapter", "----- Grey ----"); 
        } 
        else if (priority.get(position).equals(2)) 
        { 
         priority.set(position, 1); 
         setPriority = 1; 

        holder.star.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.star_med)); 

        Log.d("TaskList Adapter", "----- Yellow ----"); 
        } 
        else if (priority.get(position).equals(1)) 
        { 
         priority.set(position, 0); 
         setPriority = 0; 

        holder.star.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.star_high)); 

        Log.d("TaskList Adapter", "----- Orange ----"); 
        } 


        String updateQuery = "update tbl_tasks set priority =" + setPriority + " where taskId="+ taskId.get(position); 
        LoginActivity.db.execNonQuery(updateQuery); 


        taskrow = LoginActivity.db.getTaskRow(taskId.get(position)); 

        if(taskrow.get(2).toString().contains("'")) 
        { 
         taskrow.set(2, taskrow.get(2).toString().replace("'", "''")); 
        } 

        String insertQuery = "insert into tbl_update_tasks(taskId,listId,description,priority,dueDate,reminderId,senderId,receiverId,taskCategoryType,fadeDate,assignedId)values("+ taskrow.get(0) + ","+ taskrow.get(1)+ ",'"+ taskrow.get(2)+ "',"+ taskrow.get(3)+ ",'"+ taskrow.get(4)+ "',"+ taskrow.get(5)+ ","+ taskrow.get(6)+ ","+ taskrow.get(7)+ ",'"+ taskrow.get(8)+ "','"+ taskrow.get(9)+ "',"+ taskrow.get(10)+ ");"; 
        LoginActivity.db.execNonQuery(insertQuery); 
        notifyDataSetChanged(); 
      } 

       //Log.w("taskfilterAdapter","position....... "+v.getTag()); 
     } 


    } 

     Dialog onCreateDialog(int id){ 
      switch(id) { 
      case DATE_DIALOG_ID: 

       return new DatePickerDialog(this.context, dateListener, myYear, myMonth,myDay); 

      } 

      return null; 

     } 

    /* public class datedialogclicker extends Activity 
    { 


     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      // TODO Auto-generated method stub 
      super.onCreate(savedInstanceState); 



      holder.date.setOnClickListener(new OnClickListener() { 

       @Override 
       public void onClick(View v) { 
        // TODO Auto-generated method stub 

        Log.v("New Class....", "Click OnClick....."); 
        showDialog(DATE_DIALOG_ID); 
       } 

      }); 

      dateListener = new DatePickerDialog.OnDateSetListener() { 

       @Override 
       public void onDateSet(DatePicker view, int yr, int monthOfYear, 
         int dayOfMonth) { 
        // TODO Auto-generated method stub 
        myYear = yr; 
        myMonth = monthOfYear; 
        myDay = dayOfMonth; 

        } 

       }; 



     } 
     protected Dialog onCreateDialog(int id){ 
       switch(id) { 
       case DATE_DIALOG_ID: 

        return new DatePickerDialog(context, dateListener, myYear, myMonth,myDay); 

       } 

       return null; 

      } 
    }*/ 

    public class Checker implements OnCheckedChangeListener 
    { 

     @Override 
     public void onCheckedChanged(CompoundButton buttonView, 
       boolean isChecked) { 
      // TODO Auto-generated method stub 

      int posi=(Integer)buttonView.getTag(); 

      if(isChecked) 
      { 
       VectorCheckChange.set(posi, true);    
      } 
      else 
      { 
       VectorCheckChange.set(posi, false); 
      } 

      notifyDataSetChanged(); 


     } 

    } 
    // update by nilesh 
    public void getDateFormate() { 

     // Get the app's shared preferences 
     SharedPreferences startup_pref = PreferenceManager 
       .getDefaultSharedPreferences(context); 

     // Get the value for the run counter 
     isdaymonth = startup_pref.getBoolean(constantcode.ISDAYMONTH, true); 
    } 


} 

Answer 1

(1) Xác định mã này trong BaseAdapter onClick

((Activity)AdapterName.this.context).showDialog(DATE_DIALOG_ID); 

(2) bên dưới mã trong Hoạt động:

DatePickerDialog.OnDateSetListener dateListener = new DatePickerDialog.OnDateSetListener() { 

       @Override 
       public void onDateSet(DatePicker view, int yr, int monthOfYear, 
         int dayOfMonth) { 
        // TODO Auto-generated method stub 
        myYear = yr; 
        myMonth = monthOfYear; 
        myDay = dayOfMonth; 

       } 


     }; 


     Calendar cal = Calendar.getInstance(); 
     myYear = cal.get(Calendar.YEAR); 
     myMonth = cal.get(Calendar.MONTH); 
     myDay = cal.get(Calendar.DAY_OF_MONTH); 


protected Dialog onCreateDialog(int id){ 
      switch(id) { 
      case DATE_DIALOG_ID: 

       return new DatePickerDialog(ActivityName.this, dateListener, myYear, myMonth, myDay); 

      } 
      return null; 

     } 

Answer 2

Lỗi này rất dễ biện minh: không ngoại lệ là lỗi biên dịch - showDialog là phương thức của lớp Hoạt động. Nó rất dễ dàng cho các nhà phát triển Android để quên rằng tất cả các phương pháp phụ trợ tốt đẹp cũng nên được cung cấp bởi một số lớp phải không?

Vì vậy, điều này là OnClickListener không phải là Activity. Hãy constructor của lớp chấp nhận hoạt động tham số duy nhất, lưu trữ nó trong biến địa phương và sau đó gọi phương thức ShowDialog của nó:

private Activity activity; 
public Clicker(Activity activity) { 
    this.activity = activity; 
} 

... 
    this.activity.showDialog(); 
... 

Answer 3

tôi phải đối mặt với vấn đề lưu trữ giá trị của datepicker trong listview nhưng giải quyết it.This là mã cho it.Hope nó giúp.

import java.util.ArrayList; 
import java.util.Calendar; 
import android.app.Activity; 
import android.app.DatePickerDialog; 
import android.app.Dialog; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.DatePicker; 
import android.widget.ListView; 
import android.widget.TextView; 

public class DAteDemo extends Activity{ 

    private ListView listViewScore = null; 
    private ListViewAdapter listViewAdapter = null; 
    static final int DATE_DIALOG_ID = 0; 

    private int mYear;  
    private int mMonth; 
    private int mDay; 
    int globalPosition; //used for storing the position of textview clicked for setting the date 

    ArrayList<String> mfddateList = null; 
    int viewlength = 30; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     listViewScore=(ListView)findViewById(R.id.listViewScore); 

     mfddateList = new ArrayList<String>(); 
     for(int i=0;i<30;i++){ 
      mfddateList.add(""); 
     } 

     final Calendar c = Calendar.getInstance();   
     mYear = c.get(Calendar.YEAR);   
     mMonth = c.get(Calendar.MONTH);   
     mDay = c.get(Calendar.DAY_OF_MONTH); 

     listViewAdapter = new ListViewAdapter(); 
     listViewScore.setAdapter(listViewAdapter); 


    } 

    class ListViewAdapter extends BaseAdapter{ 

     @Override 
     public int getCount() { 

      return viewlength; 
     } 

     @Override 
     public Object getItem(int position) { 
      // TODO Auto-generated method stub 
      return null; 
     } 

     @Override 
     public long getItemId(int position) { 
      // TODO Auto-generated method stub 
      return 0; 
     } 

     @Override 
     public View getView(int position, View view, ViewGroup parent) { 
      // TODO Auto-generated method stub 
      final ViewHolder viewHolder ; 
      View rowView=view; 

      if(rowView==null){ 
       LayoutInflater layoutinflate =LayoutInflater.from(DAteDemo.this); 
       rowView=layoutinflate.inflate(R.layout.listviewnewtext, parent, false); 

       viewHolder = new ViewHolder(); 

       viewHolder.et_Sort_Order = (TextView)rowView.findViewById(R.id.et_Sort_Order); 

       //Setting listen to the text box 
       viewHolder.et_Sort_Order.setOnClickListener(new OnClickListener() { 

        @Override 
        public void onClick(View v) { 
         // TODO Auto-generated method stub 
         showDialog(DATE_DIALOG_ID); 
         globalPosition = viewHolder.ref; // this is used to update the date 
         Log.i("Log","date:-- "+viewHolder.ref); 
        } 

       }); 

       rowView.setTag(viewHolder); 
      }else{ 
       viewHolder = (ViewHolder) rowView.getTag(); 
      } 

      viewHolder.ref = position; 

      viewHolder.et_Sort_Order.setText(mfddateList.get(position)); 



      return rowView; 
     } 
    }//class ends 

    class ViewHolder{ 
     TextView et_Sort_Order; 
     int ref; 
    } 

    // the callback received when the user "sets" the date in the dialog  
    public DatePickerDialog.OnDateSetListener mDateSetListener =    
     new DatePickerDialog.OnDateSetListener() {     
     public void onDateSet(DatePicker view, int year,          
       int monthOfYear, int dayOfMonth) {      
      mYear = year;      
      mMonth = monthOfYear;      

      String date = (mMonth + 1)+"/"+mYear; 
      mfddateList.set(globalPosition,date); 
      Log.i("Log", "i m in dateset "+globalPosition); 
      listViewAdapter.notifyDataSetChanged(); //for updating the date change 

     }    
    }; 

    @Override 
    protected Dialog onCreateDialog(int id) { 
     switch (id) {  
     case DATE_DIALOG_ID:   
      return new DatePickerDialog(DAteDemo.this,mDateSetListener,mYear, mMonth,mDay);  
     }  
     return null; 
    } 

}//ActivityEnds 


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


<ListView 
    android:layout_width="match_parent" 
    android:id="@+id/listViewScore" 
    android:cacheColorHint="#00000000" 
    android:layout_height="match_parent" 
    android:layout_weight="1.00" 
    android:divider="#C0C0C0" 
    android:layout_below="@+id/layout" 
    android:dividerHeight="2dip" 
    android:background="@android:color/white" /> 

**listviewnewtext.xml** 
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:paddingTop="2dip" 
    android:paddingBottom="0dip" 
    > 

    <TextView 
     android:textColor="@android:color/black" 
     android:layout_height="wrap_content" 
     android:layout_width="80dip" 
     android:focusable="false" 
     android:id="@+id/et_Sort_Order" 

     > 

    </TextView> 


</LinearLayout>