我正在尝试创建一个简单的联系人列表应用。当我想创建一个新联系人并输入联系人的字段并按下保存按钮时，我遇到错误“非法异常列ID不存在”。
我正在使用简单的游标适配器来显示数据库到列表小部件的数据。
这是我的源代码：
public class WebpreneurActivity extends ListActivity {
private static final int CONTACT_CREATE = 0;
private static final int CONTACT_EDIT = 1;
//select the second one, Android view menu
private static final int INSERT_ID = Menu.FIRST;
private static final int DELETE_ID = Menu.FIRST + 1;
private DBHandler dbHelper;
private Cursor c;
ImageButton imageButton;
long rowid;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d("database1" ,"0");
Log.d("Your Location4", "ok4:");
super.onCreate(savedInstanceState);
Log.d("database1" ,"1");
setContentView(R.layout.activity_webpreneur);
Log.d("database1" ,"2");
dbHelper = new DBHandler(this);
Log.d("database1" ,"3");
dbHelper.open();
//addListenerOnButton();
//dbHelper.addContact();
imageButton = (ImageButton) findViewById(R.id.imageButton1);
Log.d("database1" ,"button");
imageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Log.d("database1" ,"b4");
Intent i = new Intent(getApplicationContext(), ContactEdit.class);
startActivityForResult(i, CONTACT_CREATE);
Log.d("database1" ,"button3");
//fillData();
}
});
//dbHelper.close();
}
@SuppressWarnings("deprecation")
public void fillData() {
Log.d("Your Location4", "ok6:");
c = dbHelper.fetchAllRows();
Log.d("Your Location4", "ok8:");
startManagingCursor(c);
Log.d("Your Location4", "ok2:");
// point of error !!!!
////// ListAdapter adapter = new SimpleCursorAdapter(this,
R.layout.contact_row, c, new String[] { DBHandler.Key_Name,
DBHandler.Key_Phone }, new int[] { R.id.name,
R.id.phonenumber });
setListAdapter(adapter);
}
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent i = new Intent(this, ContactEdit.class);
i.putExtra(DBHandler.Key_ID, c.getLong(c.getColumnIndex(DBHandler.Key_ID)));
i.putExtra(DBHandler.Key_Name, c.getString(c.getColumnIndex(DBHandler.Key_Name)));
i.putExtra(DBHandler.Key_Address, c.getString(c.getColumnIndex(DBHandler.Key_Address)));
i.putExtra(DBHandler.Key_Phone, c.getString(c.getColumnIndex(DBHandler.Key_Phone)));
i.putExtra(DBHandler.Key_Website, c.getString(c.getColumnIndex(DBHandler.Key_Home)));
startActivityForResult(i, CONTACT_EDIT);
}
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
String name = data.getStringExtra(DBHandler.Key_Name);
String address = data.getStringExtra(DBHandler.Key_Address);
String mobile = data.getStringExtra(DBHandler.Key_Phone);
String home = data.getStringExtra(DBHandler.Key_Home);
switch (requestCode) {
case CONTACT_CREATE:
Log.d("Your Location4", "jj:");
dbHelper.createRow(name, address, mobile, home);
Log.d("Your Location4", "ok90:");
fillData();
break;
case CONTACT_EDIT:
String id = data.getStringExtra(DBHandler.Key_ID);
long rowId=Long.parseLong(id);
if (rowId != (Long)null){
dbHelper.updateRow(rowId, name, address, mobile, home);
}
fillData();
break;
}
}
}
}
这是我的登录猫
01-28 13:34:34.841: D/AndroidRuntime(24324): Shutting down VM
01-28 13:34:34.841: W/dalvikvm(24324): threadid=1: thread exiting with uncaught exception (group=0x4001d578)
01-28 13:34:34.871: E/AndroidRuntime(24324): FATAL EXCEPTION: main
01-28 13:34:34.871: E/AndroidRuntime(24324): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=Intent { (has extras) }} to activity {com.webpreneur_contactlist/com.webpreneur_contactlist.WebpreneurActivity}: java.lang.IllegalArgumentException: column '_id' does not exist
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.app.ActivityThread.deliverResults(ActivityThread.java:2553)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.app.ActivityThread.handleSendResult(ActivityThread.java:2595)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.app.ActivityThread.access$2000(ActivityThread.java:121)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:973)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.os.Handler.dispatchMessage(Handler.java:99)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.os.Looper.loop(Looper.java:138)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.app.ActivityThread.main(ActivityThread.java:3701)
01-28 13:34:34.871: E/AndroidRuntime(24324): at java.lang.reflect.Method.invokeNative(Native Method)
01-28 13:34:34.871: E/AndroidRuntime(24324): at java.lang.reflect.Method.invoke(Method.java:507)
01-28 13:34:34.871: E/AndroidRuntime(24324): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
01-28 13:34:34.871: E/AndroidRuntime(24324): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
01-28 13:34:34.871: E/AndroidRuntime(24324): at dalvik.system.NativeStart.main(Native Method)
01-28 13:34:34.871: E/AndroidRuntime(24324): Caused by: java.lang.IllegalArgumentException: column '_id' does not exist
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:314)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.support.v4.widget.CursorAdapter.init(CursorAdapter.java:174)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.support.v4.widget.CursorAdapter.<init>(CursorAdapter.java:122)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.support.v4.widget.ResourceCursorAdapter.<init>(ResourceCursorAdapter.java:54)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.support.v4.widget.SimpleCursorAdapter.<init>(SimpleCursorAdapter.java:63)
01-28 13:34:34.871: E/AndroidRuntime(24324): at com.webpreneur_contactlist.WebpreneurActivity.fillData(WebpreneurActivity.java:82)
01-28 13:34:34.871: E/AndroidRuntime(24324): at com.webpreneur_contactlist.WebpreneurActivity.onActivityResult(WebpreneurActivity.java:117)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.app.Activity.dispatchActivityResult(Activity.java:3908)
01-28 13:34:34.871: E/AndroidRuntime(24324): at android.app.ActivityThread.deliverResults(ActivityThread.java:2549)
01-28 13:34:34.871: E/AndroidRuntime(24324): ... 11 more
我的Dbhandler课程 ///////////////// 公共类DBHandler扩展了SQLiteOpenHelper {
private static final int DB_Version = 1;
private static final String DB_Name = "Places";
protected static final String Places_Table = "Places";
private String DB_PATH="";
String name, Address, Website,ID;
//WebpreneurActivity Contact;
public static final String Key_ID = "ID";
public static final String Key_Name = "Name";
public static final String Key_Phone = "Phone";
public static final String Key_Address = "Address";
public static final String Key_Website = "Website";
public static final String Key_Home = "HOME";
public static final String PROJECTION[] = {
Key_ID,
Key_Name,
Key_Address,
Key_Phone,
Key_Home
};
String CREATE_PLACES_TABLE = "create table if not exists Places_Table (id integer primary key ,"+
"name VARCHAR not null, phone VARCHAR not null, address VARCAHR not null, website VARCHAR not null,Home VARCHAR not null)";
private final Context context;
private static SQLiteDatabase db;
public DBHandler(Context context) {
super(context, DB_Name, null, DB_Version);
this.context = context;
DB_PATH = "/data/data/" + context.getPackageName() + "/" + "databases/";
Log.d("database1" ,"4");
}
@Override
public void onCreate(SQLiteDatabase db) {
try{
Log.d("DB", "DB creationnewwwww");
db.execSQL("CREATE TABLE " + Places_Table + " (" +
Key_ID + " INTEGER PRIMARY KEY autoincrement," +
Key_Name + " TEXT NOT NULL," +
Key_Phone + " TEXT NOT NULL," +
Key_Address + " TEXT NOT NULL," +
Key_Website + " TEXT," +
Key_Home + " TEXT)");
Log.d("DB", "DB creationnewwwwwwwwwwwwwwwwwwwwwwwwwww");
}
catch(SQLiteException e){
Log.d("DB", "DB creation excptionhhhhhhhhhhhhhhh");
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("Drop Table If Exists" + Places_Table);
onCreate(db);
}
/* void addContact() {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(Key_Name,Name); // Contact Name
values.put(KEY_COST,cost); // Contact Phone
values.put(Key_Address, contact.Address); //Contact phone no
// Inserting Row
db.insert(Places_Table, null, values);
db.close(); // Closing database connection
}*/
public void open()
{Log.d("DB", "DB creation 9");
db = this.getWritableDatabase();
//onCreate(db);
Log.d("DB", "DB creation 9");
String myPath = DB_PATH + DB_Name;
db = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}
@Override
public synchronized void close() {
if(db != null)
db.close();
super.close();
}
//Adding Places
void addPlaces( int id, String name,String phone, String address,String url){
Log.d("DB", "DB creation 1");
//SinglePlaceActivity single = new SinglePlaceActivity(); Log.d("DB", "DB creation 2");
ContentValues contentValues = new ContentValues();
Log.d("DB", "DB creation 3");
contentValues.put(Key_ID, id);
Log.d("DB", "DB creation 4");
contentValues.put(Key_Name, name);
contentValues.put(Key_Phone, phone);
contentValues.put(Key_Address, address);
contentValues.put(Key_Website, url);
Log.d("DB", "DB creation 4");
db.insert(Places_Table, null, contentValues);
Log.d("DB", "DB creation 5555");
//db.close();
}
public String getdata() {
// TODO Auto-generated method stub
String [] columns =new String[]{Key_ID ,Key_Name,Key_Address,Key_Website};
Cursor c =db.query(DB_Name, columns, null, null, null, null, null);
String Result="";
int iRow=c.getColumnIndex(Key_ID);
int iName=c.getColumnIndex(Key_Name);
int iAddress=c.getColumnIndex(Key_Address);
int iWebsite=c.getColumnIndex(Key_Website);
for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
Result=Result+c.getString(iRow)+" "+c.getString(iName)+ " "+c.getString(iAddress)+ " "+c.getString(iWebsite)+ "\n";
}
return Result;
}
public void createRow(String name, String address, String Phone, String home)
{SQLiteDatabase db = this.getWritableDatabase();
ContentValues initialValues = new ContentValues();
initialValues.put(Key_Name, name);
initialValues.put(Key_Address, address);
initialValues.put(Key_Phone, Phone);
initialValues.put(Key_Home, home);
//pass the initialValues to the database to insert the row
Log.d(Key_Home, home);
db.insert(Places_Table, null, initialValues);
Log.d("Your Location4", "okna:");
}
public void deleteRow(long rowId){
db.delete(Places_Table, Key_ID+"="+rowId,null);
}
public boolean updateRow (long rowId, String name, String address, String Phone, String home){
ContentValues args = new ContentValues();
args.put(Key_Name, name);
args.put(Key_Address, address);
args.put(Key_Phone, Phone);
args.put(Key_Home, home);
return db.update(Places_Table, args, Key_ID +"="+ rowId, null)>0;
}
public Cursor fetchRow(long rowId) throws SQLException{
Cursor result = db.query( Places_Table, null,
Key_ID + "=" + rowId, null, null, null,null);
if ((result.equals(rowId)) || !result.isFirst()) {
throw new SQLException("No note matching ID: " + rowId);
}
return result;
}
public Cursor fetchAllRows(){
Log.d("Your Location4", "ok99:");
return db.query(Places_Table, PROJECTION,
null, null, null, null, null);
}
}
答案 0 :(得分：2)
Cursor Adapter需要Cursor中的_id字段才能工作。 http://developer.android.com/reference/android/widget/CursorAdapter.html
您可以使用以下CursorWrapper，它允许您将_id设置为您想要的任何字段。
https://groups.google.com/d/msg/ormlite-user/SbRoHIov5pI/-8Ir3pEycw0J
正如谷歌用户jc所说：
/**
* A {@link CursorWrapper} implementation that allows a {@link Cursor}
* without a field named "_id" to be used with various Android {@link ListView}
* classes that expect a column named "_id". This is done by specifying an
* alias field name to be used in place of "_id".
*
* @author j_...@users.sourceforge.net
*/
public class NoIdCursorWrapper extends CursorWrapper {
private int idColumnIndex;
/**
* Create a NoIdCursorWrapper using the alias column index.
* @param c the cursor to wrap
* @param idColumnIndex the column index to use as the _id column
alias
*/
public NoIdCursorWrapper(Cursor c, int idColumnIndex) {
super(c);
this.idColumnIndex = idColumnIndex;
}
/**
* Create a NoIdCursorWrapper using the alias column name.
* @param c the cursor to wrap
* @param idColumnName the column name to use as the _id column alias
*/
public NoIdCursorWrapper(Cursor c, String idColumnName) {
super(c);
idColumnIndex = c.getColumnIndex(idColumnName);
}
@Override
public int getColumnIndex(String columnName) {
int index = super.getColumnIndex(columnName);
if (index < 0 && "_id".equals(columnName)) {
index = idColumnIndex;
}
return index;
};
@Override
public int getColumnIndexOrThrow(String columnName) throws IllegalArgumentException {
int index = getColumnIndex(columnName);
if (index>=0) {
return index;
}
// let the AbstractCursor generate the exception
return super.getColumnIndexOrThrow(columnName);
};
}
然后在fillData
@SuppressWarnings("deprecation")
public void fillData() {
Log.d("Your Location4", "ok6:");
// Load the Cursor in the normal way
c = dbHelper.fetchAllRows();
// wrap the cursor in the NoIdCursorWrapper to handle the missing _id field
// (int this case the DBHandler.Key_ID field will act as the _id)
NoIdCursorWrapper nc = new NoIdCursorWrapper(c, DBHandler.Key_ID);
Log.d("Your Location4", "ok8:");
startManagingCursor(c);
Log.d("Your Location4", "ok2:");
// Add the NoIdCursorWrapper instead of the Cursor itself
ListAdapter adapter = new SimpleCursorAdapter(this,
R.layout.contact_row, nc, new String[] { DBHandler.Key_Name,
DBHandler.Key_Phone }, new int[] { R.id.name,
R.id.phonenumber });
setListAdapter(adapter);
}
答案 1 :(得分：0)
PROJECTION Key_ID "ID"为"_id"。所有CursorAdapters都要求有一个名为id的列。您应该将_id列重命名为public static final String PROJECTION[] = {
Key_ID + " AS _id",
。作为快速解决方法，您还可以创建列别名：
{{1}}
答案 2 :(得分：-1)
即使您没有显示，也必须在适配器中包含_id列。
ListAdapter adapter = new SimpleCursorAdapter(this,
R.layout.contact_row, c, new String[] { "_id", DBHandler.Key_Name,
DBHandler.Key_Phone }, new int[] { R.id.name,
R.id.phonenumber });