大家好，我的应用程序中的ListView存在问题。
我有这个添加到数据库的约会列表，然后当我想删除它们时，ListView没有向我显示约会......它只显示我'测试'。
我有Appointment课程：
package com.example.calendar;
public class Appointment {
//variables(that are the attributes of the database table)
int _id;
String _title;
String _time;
String _details;
String _date;
//empty constructor to add for the update method in the DBHandler
public Appointment(){
}
public Appointment(int id, String date, String title, String time, String details){
this._id = id;
this._date = date;
this._title = title;
this._time = time;
this._details = details;
}
public Appointment(String date, String title, String time, String details){
this._date = date;
this._title = title;
this._time = time;
this._details = details;
}
//----------GET/SET METHODS BELOW-----------
//--------ID---------
public int getID(){
return this._id;
}
public void setID(int id){
this._id = id;
}
//-------DATE-------
public String getDate(){
return this._date;
}
public void setDate(String date){
this._date = date;
}
//-----TITLE---------
public String getTitle(){
return this._title;
}
public void setTitle(String title){
this._title = title;
}
//------TIME-------
public String getTime(){
return this._time;
}
public void setTime(String time){
this._time = time;
}
//------DETAILS--------
public String getDetails(){
return this._details;
}
public void setDetails(String details){
this._details = details;
}
@Override
public String toString() {
return _title;
}
}
用于管理数据库事件的DBHandler类：
package com.example.calendar;
import java.util.ArrayList;
import java.util.List;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DBHandler extends SQLiteOpenHelper{
//Variables needed
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "appts";// database name
private static final String TABLE_APP = "appointments";// table name
//key names for the table
private static final String KEY_ID = "id";
private static final String KEY_DATE = "date";
private static final String KEY_TITLE = "title";
private static final String KEY_TIME = "time";
private static final String KEY_DETAILS = "details";
private static String SEARCH = "";
public DBHandler(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override//create table
public void onCreate(SQLiteDatabase db){
String CREATE_APPOINTMENTS_TABLE = "CREATE TABLE " + TABLE_APP + "("
+ KEY_ID + " INTEGER PRIMARY KEY, " + KEY_DATE + " TEXT NOT NULL,"
+ KEY_TITLE + " TEXT, " + KEY_TIME + " TEXT, " + KEY_DETAILS + " TEXT" + ")";
db.execSQL(CREATE_APPOINTMENTS_TABLE);
}
@Override//when upgraded, trigger
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
db.execSQL("DROP TABLE IF EXISTS " + TABLE_APP);//delete table from older version
onCreate(db);//create new table
}
void addAppointment(Appointment appointment){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_DATE, appointment.getDate().toString());
values.put(KEY_TITLE, appointment.getTitle());
values.put(KEY_TIME, appointment.getTime());
values.put(KEY_DETAILS, appointment.getDetails());
db.insert(TABLE_APP, null, values);
db.close();
}
Appointment getAppointment(int id){
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_APP, new String[] {KEY_ID, KEY_DATE, KEY_TITLE, KEY_TIME, KEY_DETAILS}, KEY_ID + "=?",
new String[]{String.valueOf(id)}, null, null, null, null);
if(cursor != null){
cursor.moveToFirst();
}
Appointment appointment = new Appointment(Integer.parseInt(cursor.getString(0)), cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4));
return appointment;
}
public List<Appointment> getAppointments(){
List<Appointment> appointmentList = new ArrayList<Appointment>();
String selectQuery = "SELECT * FROM " + TABLE_APP;//query to search appointment by title
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if(cursor.moveToFirst()){
do{
Appointment appointment = new Appointment();
//appointment.setID(Integer.parseInt(cursor.getString(0)));
appointment.setDate(cursor.getString(1));
appointment.setTitle(cursor.getString(2));
appointment.setTime(cursor.getString(3));
appointment.setDetails(cursor.getString(4));
appointmentList.add(appointment);
} while(cursor.moveToNext());
}
return appointmentList;
}
public int updateAppointment(Appointment appointment){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_DATE, appointment.getDate());
values.put(KEY_TITLE, appointment.getTitle());
values.put(KEY_TIME, appointment.getTime());
values.put(KEY_DETAILS, appointment.getDetails());
return db.update(TABLE_APP, values, KEY_ID + " = ?", new String[] {String.valueOf(appointment.getID())});
}
public void deleteAppointment(Appointment appointment){
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_APP, KEY_ID + " = ?", new String[]{String.valueOf(appointment.getID())});
db.close();
}
public int getAppointmentCount(){
String countQuery = "SELECT * FROM " + TABLE_APP;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
return cursor.getCount();
}
}
DeleteAppointment类：
package com.example.calendar;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class DeleteAppointment extends Activity implements OnClickListener{
DBHandler db = new DBHandler(this);
Appointment app;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.delete);
Button deleteAll = (Button)findViewById(R.id.btn_deleteAll);
deleteAll.setOnClickListener(this);
ListView list = (ListView)findViewById(R.id.apptList);
ArrayAdapter<Appointment> mArrayAdapter = new ArrayAdapter<Appointment>(this, R.layout.item, R.id.row, db.getAppointments());
list.setAdapter(mArrayAdapter);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case R.id.btn_deleteAll:
finish();
break;
}
}
}
这里的问题是LogCat没有给我任何错误，因此，我不知道这有什么问题。
有人可以帮助我吗？