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How to use DatePickerDialog in BaseAdapter

I am working with the BaseAdapter class. I want to display DatePickerDialog in it. When I use showDialog(DATE_DIALOG_ID); , I get an error.

I ask you to instruct us about this.

package 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 shared preferences SharedPreferences startup_pref = PreferenceManager .getDefaultSharedPreferences(context); // Get the value for the run counter isdaymonth = startup_pref.getBoolean(constantcode.ISDAYMONTH, true); } }
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3 answers

(1) Define this code in BaseAdapter onClick

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

(2) below code in Office:

  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; }
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The error is easy to justify: it is not an exception, it is a compilation error - showDialog is a method of the Activity class. Is it so easy for Android developers to forget that all these useful helper methods should also be provided by some classes?

So the thing is that OnClickListener not an Activity . Make a constructor for a class that takes a one-parameter action, save it in a local variable, and then call its showDialog method:

 private Activity activity; public Clicker(Activity activity) { this.activity = activity; } ... this.activity.showDialog(); ...
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I ran into the problem of storing the datepicker value in a list, but resolved it. This is the code for it. Hope this helps.

 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", "im 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>
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Source: https://habr.com/ru/post/906370/

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