如何讓EditText獲得您長期點擊的ArrayList元素的值？

package sg.edu.rp.c345.p04; 

import java.util.ArrayList; 
import java.util.Collections; 

import android.app.AlertDialog; 
import android.app.ListActivity; 
import android.content.DialogInterface; 
import android.os.Bundle; 
import android.view.ContextMenu; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ListView; 

public class toDo extends ListActivity { 
    /** Called when the activity is first created. */ 
    EditText toDoEditText; 
    Button submitButton; 
    ListView toDoListView; 

    ArrayList<String> toDoTasks; 
    ArrayAdapter<String> taskArrayAdapter; 

    static final private int SORT_TASKS = Menu.FIRST; 
    static final private int REVERSE_SORT_TASKS = Menu.FIRST + 1; 
    static final private int REMOVE_TASKS = Menu.FIRST + 2; 
    static final private int EDIT_TASKS = Menu.FIRST + 3; 

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

     toDoEditText = (EditText) findViewById(R.id.toDoEditText); 
     submitButton = (Button) findViewById(R.id.submitButton); 
     toDoListView = getListView(); 
     toDoTasks = new ArrayList<String>(); 
     taskArrayAdapter = new ArrayAdapter<String>(this, 
       android.R.layout.simple_list_item_1, toDoTasks); 

     toDoListView.setAdapter(taskArrayAdapter); 

     registerForContextMenu(toDoListView); 

     submitButton.setOnClickListener(new OnClickListener() { 
      public void onClick(View v) { 
       if (toDoEditText.getText().toString().length() == 0) { 
        return; 
       } 
       String task = toDoEditText.getText().toString(); 
       toDoTasks.add(task); 
       taskArrayAdapter.notifyDataSetChanged(); 
       toDoEditText.setText(""); 
      } 
     }); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu optionsMenu) { 
     super.onCreateOptionsMenu(optionsMenu); 
     // Create and add new menu items. 
     MenuItem itemSort = optionsMenu.add(0, SORT_TASKS, Menu.NONE, 
       R.string.sortAll); 
     MenuItem itemReverseSort = optionsMenu.add(0, REVERSE_SORT_TASKS, 
       Menu.NONE, R.string.sortReverse); 
     MenuItem itemRem = optionsMenu.add(0, REMOVE_TASKS, Menu.NONE, 
       R.string.removeAll); 
     itemSort.setIcon(R.drawable.sort_btn); 
     itemReverseSort.setIcon(R.drawable.reverse_sort_btn); 
     itemRem.setIcon(R.drawable.remove_btn); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem optionItem) { 
     super.onOptionsItemSelected(optionItem); 
     switch (optionItem.getItemId()) { 
     case (SORT_TASKS): { 

      // Perform the necessary task to sort the items in the ArrayList 
      // alphabetically 
      // Hint: use Collections.sort() 
      Collections.sort(toDoTasks); 
      taskArrayAdapter.notifyDataSetChanged(); 

      return true; 
     } 
     case (REVERSE_SORT_TASKS): { 

      // Perform the necessary task to sort the items in the ArrayList 
      // reverse alphabetically 
      // Hint: use Collections.reverse() 
      Collections.reverse(toDoTasks); 
      taskArrayAdapter.notifyDataSetChanged(); 

      return true; 
     } 
     case (REMOVE_TASKS): { 

      // Perform the necessary actions to remove ALL the tasks in the 
      // ArrayList 
      toDoTasks.clear(); 
      taskArrayAdapter.notifyDataSetChanged(); 

      return true; 
     } 
     } 
     return false; 
    } 

    @Override 
    public void onCreateContextMenu(ContextMenu menu, View v, 
      ContextMenu.ContextMenuInfo menuInfo) { 
     super.onCreateContextMenu(menu, v, menuInfo); 
     menu.setHeaderTitle("Choose your action"); 
     menu.add(0, REMOVE_TASKS, Menu.NONE, R.string.removeItem); 
     menu.add(0, EDIT_TASKS, Menu.NONE, R.string.editItem); 
    } 

    @Override 
    public boolean onContextItemSelected(MenuItem item) { 
     super.onContextItemSelected(item); 
     switch (item.getItemId()) { 
     case (REMOVE_TASKS): { 
      AdapterView.AdapterContextMenuInfo menuInfo; 
      menuInfo = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo(); 
      final int removeIndex = menuInfo.position; 
      toDoTasks.remove(removeIndex); 
      taskArrayAdapter.notifyDataSetChanged(); 
      return true; 
     } 
     case (EDIT_TASKS): { 
      AdapterView.AdapterContextMenuInfo menuInfo; 
      menuInfo = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo(); 
      final int editIndex = menuInfo.position; 
      final String editText = menuInfo.toString(); 

      AlertDialog.Builder alert = new AlertDialog.Builder(this); 

      alert.setTitle("Edit Task"); 
      alert.setMessage("Edit Task Message"); 

      // Set an EditText view to get user input 
      final EditText editInput = new EditText(this); 
      alert.setView(editInput); 

      alert.setPositiveButton("Ok", 
        new DialogInterface.OnClickListener() { 
         public void onClick(DialogInterface dialog, 
           int whichButton) { 
          String editTask = editInput.getText().toString(); 
          // Do something with value! 
          toDoTasks.set(editIndex, editTask); 
          taskArrayAdapter.notifyDataSetChanged(); 
         } 
        }); 

      alert.setNegativeButton("Cancel", 
        new DialogInterface.OnClickListener() { 
         public void onClick(DialogInterface dialog, 
           int whichButton) { 
          // Canceled. 
         } 
        }); 

      alert.show(); 
     } 
     } 
     return false; 
    } 
}

如何讓EditText獲得您長期點擊的ArrayList元素的值？如何讓EditText獲得您長期點擊的ArrayList元素的值？

來源

2011-05-19 Wong Chun Kiat