java.lang.IllegalArgumentException: column '_id' does not exist 求助！
数据库的表有三列分别为_id,todo_text1,todo_text2想要在listview的item中只显示todo_text1,todo_text2
然后出现了java.lang.IllegalArgumentException: column '_id' does not exist的错误
提示错误位置是 SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.b_item,myCursor,
下面是代码
程序代码：package st.st.st;
import android.app.Activity;
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.AdapterView.OnItemClickListener;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class St3 extends Activity {
//体重记录
private ToDoDB myToDoDB;
private Cursor myCursor;
private ListView myListView;
private EditText myEditText1;//输入日期
private EditText myEditText2;//输入体重
private int _id;
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;
protected final static int MENU_BACK=Menu.FIRST+3;//菜单按钮“返回”功能
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
super.onOptionsItemSelected(item);
switch (item.getItemId())
{
case MENU_ADD:
this.addTodo();
break;
case MENU_EDIT:
this.editTodo();
break;
case MENU_DELETE:
this.deleteTodo();
break;
case MENU_BACK:
this.ReBack();
break;
}
return true;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
super.onCreateOptionsMenu(menu);
/*添加四个个MENU*/
menu.add(Menu.NONE, MENU_ADD, 0, "添加");
menu.add(Menu.NONE, MENU_EDIT, 0, "修改");
menu.add(Menu.NONE, MENU_DELETE, 0,"删除");
menu.add(Menu.NONE,MENU_BACK,0,"返回");
return true;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.b);
myListView = (ListView) this.findViewById(R.id.b_lv);
myEditText1 = (EditText) this.findViewById(R.id.b_rq);//输入日期的edittext
myEditText2 = (EditText) this.findViewById(R.id.b_tz);//输入体重的edittext
myToDoDB = new ToDoDB(this);
myCursor = myToDoDB.select();
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.b_item,myCursor,
new String[]{ToDoDB.FIELD_TEXT1,ToDoDB.FIELD_TEXT2},
new int[]{R.id.listtext_riqi,R.id.listtext_tizhong});
myListView.setAdapter(adapter);
myListView.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
myCursor.moveToPosition(arg2);
_id=myCursor.getInt(0);
myEditText1.setText(myCursor.getString(1));
myEditText2.setText(myCursor.getString(2));
}
});
myListView.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
SQLiteCursor sc=(SQLiteCursor)arg0.getSelectedItem();
_id=sc.getInt(0);
myEditText1.setText(sc.getString(1));
myEditText2.setText(sc.getString(2));
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
/*添加数据*/
private void addTodo() {
// TODO Auto-generated method stub
if(myEditText1.getText().toString().equals("")
&& myEditText2.getText().toString().equals(""))
return;
myToDoDB.insert(myEditText1.getText().toString(),myEditText2.getText().toString());
myCursor.requery();
myListView.invalidateViews();
myEditText1.setText("");
myEditText2.setText("");
_id=0;
}
/*编辑更改数据*/
private void editTodo()
{
if (myEditText1.getText().toString().equals("")
&& myEditText2.getText().toString().equals(""))
return;
myToDoDB.update(_id, myEditText1.getText().toString(),myEditText2.getText().toString());
myCursor.requery();
myListView.invalidateViews();
myEditText1.setText("");
myEditText2.setText("");
_id = 0;
}
/*删除数据*/
private void deleteTodo() {
// TODO Auto-generated method stub
if (_id == 0)
return;
/* ?埃戈? */
myToDoDB.delete(_id);
myCursor.requery();
myListView.invalidateViews();
myEditText1.setText("");
myEditText2.setText("");
_id = 0;
}
private void ReBack() {
// TODO Auto-generated method stub
Intent intent = new Intent();
//设置Intent对象要启动的Activity
myToDoDB.close();
intent.setClass(St3.this,St1Activity.class);
//通过Intent对象启动另外一个Activity
startActivity(intent);
St3.this.finish();
}
}
package st.st.st;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
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_TEXT1="todo_text1";//日期
public final static String FIELD_TEXT2="todo_text2";//体重
public ToDoDB(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
String sql = "CREATE TABLE " + TABLE_NAME + " (" + FIELD_id
+ " INTEGER primary key autoincrement, " + FIELD_TEXT1 +" text,"+ FIELD_TEXT2 +" text)";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
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 text1,String text2){
SQLiteDatabase db=this.getWritableDatabase();
ContentValues cv=new ContentValues();
cv.put(FIELD_TEXT1, text1);
cv.put(FIELD_TEXT2, text2);
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 text1,String text2)
{
SQLiteDatabase db = this.getWritableDatabase();
String where = FIELD_id + " = ?";
String[] whereValue =
{ Integer.toString(id) };
ContentValues cv = new ContentValues();
cv.put(FIELD_TEXT1, text1);
cv.put(FIELD_TEXT2, text2);
db.update(TABLE_NAME, cv, where, whereValue);
}
}
