下拉式選單

加好友 · 發表於 2011-9-28 23:00

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請問我的下拉式選單怎麼不會出現

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加好友 · 發表於 2011-9-29 00:07

是否能詳細說明妳的問題!? 有看沒有懂!!

加好友 · 發表於 2011-9-29 11:15

就是剛開啟時下拉式選單式完全沒東西的
然後隨便建立一個資料再把它刪除我的下拉式選單的東西就又跑出來了
我想要的是剛開啟時是不是可以把下拉式選單顯示出來
讓我可以選

加好友 · 發表於 2011-9-29 13:43

我覺得你的UI處理動向有點問題唷。
是不是先說說你想做的功能為何？

spinner 的東西沒出來，應該是你的adapter沒有處理好而已。

加好友 · 發表於 2011-10-3 01:41

可以的話建議你將程式放上來!這樣比較好幫你除錯

加好友 · 發表於 2011-10-12 18:31

本帖最後由 yuno5420 於 2011-10-12 18:41 編輯

我想做一個記帳本
我是套一個記事本的範例做的
程式是要PO資料庫的程式還是別的?
因為這是專題老師要我們做的
希望大大們可以幫我解決

這是資料庫的程式碼

package student.edu.MMB;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class ToDoDB extends SQLiteOpenHelper
{
   private final static String DATABASE_NAME = "todo_db";
   private final static int DATABASE_VERSION = 1;
   private final static String TABLE_NAME = "todo_table";
   public final static String FIELD_id = "_id";
   public final static String FIELD_TEXT = "todo_text";
   public final static String FIELD_SPINNER1 = "todo_spinner1";
   public final static String FIELD_SPINNER2 = "todo_spinner2";
   public final static String FIELD_SPINNER3 = "todo_spinner3";

   public ToDoDB(Context context)
   {
      super(context, DATABASE_NAME, null, DATABASE_VERSION);
   }

   @Override
   public void onCreate(SQLiteDatabase db)
   {
      /* 建立table */
      String sql = "CREATE TABLE " + TABLE_NAME + " (" + FIELD_id
         + " INTEGER primary key autoincrement, " + " " + FIELD_TEXT + " text)" ;
      db.execSQL(sql);
   }

   @Override
   public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
   {
      String sql = "DROP TABLE IF EXISTS " + TABLE_NAME;
      db.execSQL(sql);
      onCreate(db);
   }

   public Cursor select()
   {
      SQLiteDatabase db = this.getReadableDatabase();
      Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null, null);
      return cursor;
   }

   public long insert(String text)
   {
      SQLiteDatabase db = this.getWritableDatabase();
      /* 將新增的值放入ContentValues */
      ContentValues cv = new ContentValues();
      cv.put(FIELD_TEXT, text);

      long row = db.insert(TABLE_NAME, null, cv);
      return row;
   }

   public void delete(int id)
   {
      SQLiteDatabase db = this.getWritableDatabase();
      String where = FIELD_id + " = ?";
      String[] whereValue =
      { Integer.toString(id) };
      db.delete(TABLE_NAME, where, whereValue);
   }

   public void update(int id, String text)
   {
      SQLiteDatabase db = this.getWritableDatabase();
      String where = FIELD_id + " = ?";
      String[] whereValue =
      { Integer.toString(id) };
      /* 將修改的值放入ContentValues */
      ContentValues cv = new ContentValues();
      cv.put(FIELD_TEXT, text);


      db.update(TABLE_NAME, cv, where, whereValue);
   }
}

這是頁面的程式碼

package student.edu.MMB;

import android.app.Activity;
import android.widget.Spinner;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteCursor;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.view.ViewGroup.OnHierarchyChangeListener;

public class Change1 extends Activity
{

   private ToDoDB myToDoDB;
   private Cursor myCursor;
   private ListView myListView;
   private EditText myEditText;
      private Spinner myspinner1;
      private Spinner myspinner2;
      private Spinner myspinner3;


   private int _id;
   private Bundle savedInstanceState;
   protected final static int MENU_ADD = Menu.FIRST;
   protected final static int MENU_EDIT = Menu.FIRST + 1;
   protected final static int MENU_DELETE = Menu.FIRST + 2;


   @Override
   public boolean onOptionsItemSelected(MenuItem item)
   {
      super.onOptionsItemSelected(item); //提供選擇類別
      switch (item.getItemId())
      {
      case MENU_ADD: //新增資料事件
         this.addTodo();
         break;
      case MENU_EDIT: //編輯資料事件
         this.editTodo();
         break;
      case MENU_DELETE: //刪除資料事件
         this.deleteTodo();
         break;
      }
      return true;
   }

   @Override
   public boolean onCreateOptionsMenu(Menu menu)
   {

      super.onCreateOptionsMenu(menu);
      /* 新增三個MENU */
      menu.add(Menu.NONE, MENU_ADD, 0, R.string.strAddButton);
      menu.add(Menu.NONE, MENU_EDIT, 0, R.string.strEditButton);
      menu.add(Menu.NONE, MENU_DELETE, 0, R.string.strDeleteButton);

      return true;
   }

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState)
   {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.page1);

      setContentView(R.layout.page1);

      Button b1 = (Button) findViewById(R.id.button6);
      b1.setOnClickListener(new Button.OnClickListener()
      {
      public void onClick(View v)
      {


         Intent intent = new Intent();
         intent.setClass(Change1.this, MMB.class);
         startActivity(intent);
         Change1.this.finish();
         }
      });


      myListView = (ListView) this.findViewById(R.id.myListView);
      myEditText = (EditText) this.findViewById(R.id.myEditText);
         myspinner1 = (Spinner) this.findViewById(R.id.myspinner1);
         myspinner2 = (Spinner) this.findViewById(R.id.myspinner2);
         myspinner3 = (Spinner) this.findViewById(R.id.myspinner3);


      myToDoDB = new ToDoDB(this);
      /* 取得DataBase裡的資料 */
      myCursor = myToDoDB.select();

      /* new SimpleCursorAdapter並將myCursor傳入，顯示資料的欄位為todo_text */
      SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.list,
         myCursor, new String[]
         { ToDoDB.FIELD_TEXT }, new int[]
         { R.id.listTextView1 });
      myListView.setAdapter(adapter);

      /* 將myListView加入OnItemClickListener */
      myListView.setOnItemClickListener(new AdapterView.OnItemClickListener()
      {

      public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
            long arg3)
      {
         /* 將myCursor移到所點選的值 */
         myCursor.moveToPosition(arg2);
         /* 取得欄位_id的值 */
         _id = myCursor.getInt(0);
         /* 取得欄位todo_text的值 */
         myEditText.setText(myCursor.getString(1));
      }

      });
      myListView
         .setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
         {

            public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
               long arg3)
            {
            /* getSelectedItem所取得的是SQLiteCursor */
            SQLiteCursor sc = (SQLiteCursor) arg0.getSelectedItem();
            _id = sc.getInt(0);
            myEditText.setText(sc.getString(1));
            }

            public void onNothingSelected(AdapterView<?> arg0)
            {

            }

         });

   }

   private void addTodo()
   {
      if (myEditText.getText().toString().equals(""))
      return;
      /* 新增資料到資料庫 */
      myToDoDB.insert(myEditText.getText().toString());
      /* 重新查詢 */
      myCursor.requery();
      /* 重新整理myListView */
      myListView.invalidateViews();
      myEditText.setText("");
      _id = 0;
   }

   private void editTodo()
   {
      if (myEditText.getText().toString().equals(""))
      return;
      /* 修改資料 */
      myToDoDB.update(_id, myEditText.getText().toString());
      myCursor.requery();
      myListView.invalidateViews();
      myEditText.setText("");
      _id = 0;
   }

   private void deleteTodo()
   {
      if (_id == 0)
      return;
      /* 刪除資料 */
      myToDoDB.delete(_id);
      myCursor.requery();
      myListView.invalidateViews();
      myEditText.setText("");
      _id = 0;



   Spinner spinner = (Spinner) findViewById(R.id.myspinner1);
   CharSequence[] seq = {"收入","支出"};
   ArrayAdapter<CharSequence> adapter = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_spinner_item, seq);
   adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
   spinner.setAdapter(adapter);
   spinner.setOnHierarchyChangeListener(new OnHierarchyChangeListener() {

public void onChildViewAdded(View parent, View child) {
// TODO Auto-generated method stub

}
public void onChildViewRemoved(View parent, View child) {
// TODO Auto-generated method stub

}
      });

   Spinner spinner2 = (Spinner) findViewById(R.id.myspinner2);
   CharSequence[] seq2 = {"早餐","中餐","晚餐"};
   ArrayAdapter<CharSequence> adapter2 = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_spinner_item, seq2);
   adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
   spinner2.setAdapter(adapter2);
   spinner2.setOnHierarchyChangeListener(new OnHierarchyChangeListener() {

public void onChildViewAdded(View parent, View child) {
// TODO Auto-generated method stub

}
public void onChildViewRemoved(View parent, View child) {
// TODO Auto-generated method stub

}
      });



   Spinner spinner3 = (Spinner) findViewById(R.id.myspinner3);
   CharSequence[] seq3 = {"中式","西式","中西式","法式"};
   ArrayAdapter<CharSequence> adapter3 = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_spinner_item, seq3);
   adapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
   spinner3.setAdapter(adapter3);
   spinner3.setOnHierarchyChangeListener(new OnHierarchyChangeListener() {

public void onChildViewAdded(View parent, View child) {
// TODO Auto-generated method stub

}
public void onChildViewRemoved(View parent, View child) {
// TODO Auto-generated method stub

}
      });





   }



}

[求助] 下拉式選單

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