Android 列表的删除项不存在';行不通
很长时间以来,我一直在试图找到解决这个问题的办法。问题是代码没有删除列表视图中选定的项目。刷新列表后,它在日志cat中指出这是一个“id”问题。有人能帮我找出原因吗 名单Android 列表的删除项不存在';行不通,android,Android,很长时间以来,我一直在试图找到解决这个问题的办法。问题是代码没有删除列表视图中选定的项目。刷新列表后,它在日志cat中指出这是一个“id”问题。有人能帮我找出原因吗 名单 public class ListedesClient extends ListActivity { TextView selectionc; public int idToModify; ClientDataAdapter dm; String clientId; List<
public class ListedesClient extends ListActivity {
TextView selectionc;
public int idToModify;
ClientDataAdapter dm;
String clientId;
List<String[]> list = new ArrayList<String[]>();
List<String[]> names2 =null ;
ArrayList<String> stg1;
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.listeclients);
dm = new ClientDataAdapter(this);
names2 = dm.selectAll();
stg1 = new ArrayList<String>();
for (String[] name : names2) {
stg = name[1]+" "+name[2]+ " "+name[3]; // error here
stg1.add(stg);// error here two
x++;// error here two
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
this,android.R.layout.simple_list_item_1,
stg1);
this.setListAdapter(adapter);
selectionc=(TextView)findViewById(R.id.selectionc);
}
public void onListItemClick(final ListView parent, View v, final int position, final long id) {
selectionc.setText("Vous êtes sur : " + stg1[position]); //error here in stg1[position]
AlertDialog.Builder builder = new AlertDialog.Builder(this)
.setTitle("Delete Item")
.setMessage("are you sure to delete?")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
// @-@ dm.delete(list.get(position));
dm.delete(id);
ArrayAdapter adapter = (ArrayAdapter)parent.getAdapter();
adapter.remove(stg1[position]);// same error
adapter.notifyDataSetChanged();
}
})
.setNegativeButton("No",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
return;
}
});
builder.show();
}
}
公共类ListedClient扩展ListActivity{
文本视图选择c;
公共信息管理;
ClientDataAdapter-dm;
字符串clientId;
列表=新的ArrayList();
列表名称2=空;
阵列列表stg1;
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.listClient);
dm=新的ClientDataAdapter(此);
names2=dm.selectAll();
stg1=新的ArrayList();
对于(字符串[]名称:名称2){
stg=name[1]+“”+name[2]+“”+name[3];//此处有错误
stg1.add(stg);//这里有两个错误
x++;//这里有两个错误
}
ArrayAdapter=新的ArrayAdapter(
这个,android.R.layout.simple\u list\u item\u 1,
stg1);
这个.setListAdapter(适配器);
selectionc=(TextView)findViewById(R.id.selectionc);
}
public void onListItemClick(最终列表视图父视图、视图v、最终整型位置、最终长id){
selectionc.setText(“Vousêtes sur:+stg1[position]);//stg1[position]中有错误
AlertDialog.Builder=新建AlertDialog.Builder(此)
.setTitle(“删除项”)
.setMessage(“您确定要删除吗?”)
.setPositiveButton(“是”,
新建DialogInterface.OnClickListener(){
@凌驾
公共void onClick(对话框接口arg0,int arg1){
//@-@dm.delete(list.get(position));
dm.删除(id);
ArrayAdapter=(ArrayAdapter)parent.getAdapter();
adapter.remove(stg1[position]);//相同错误
adapter.notifyDataSetChanged();
}
})
.setNegativeButton(“否”,
新建DialogInterface.OnClickListener(){
@凌驾
公共void onClick(对话框接口对话框,
int(其中){
//TODO自动生成的方法存根
返回;
}
});
builder.show();
}
}
数据适配器
public class ClientDataAdapter {
private static final String DATABASE_NAME = "clientbase.db";
private static final int DATABASE_VERSION = 1;
static final String TABLE_CLIENT = "clienttable";
private static Context context;
static SQLiteDatabase dc;
private SQLiteStatement insertStmt;
private static final String INSERT = "insert into "
+ TABLE_CLIENT + " (nom_complet,adresse_client,numero_telephone) values (?,?,?)";
public ClientDataAdapter(Context context) {
ClientDataAdapter.context = context;
OpenHelper openHelper = new OpenHelper(ClientDataAdapter.context);
ClientDataAdapter.dc = openHelper.getWritableDatabase();
this.insertStmt = ClientDataAdapter.dc.compileStatement(INSERT);
}
public long insert(String nom_complet,String adresse_client,String numero_telephone) {
this.insertStmt.bindString(1, nom_complet);
this.insertStmt.bindString(2, adresse_client);
this.insertStmt.bindString(3, numero_telephone);
return this.insertStmt.executeInsert();
}
public void deleteAll() {
dc.delete(TABLE_CLIENT, null, null);
}
public ArrayList<String[]> selectAll()
{
ArrayList<String[]> list = new ArrayList<String[]>();
Cursor cursor = dc.query(TABLE_CLIENT, new String[] { "_id","nom_complet","adresse_client","numero_telephone"},
null, null, null, null, "nom_complet asc");
int x=0;
if (cursor.moveToFirst()) {
do {
String[] b1=new String[]{cursor.getString(0),cursor.getString(1),cursor.getString(2),cursor.getString(3)};
list.add(b1);
x=x+1;
} while (cursor.moveToNext());
}
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
cursor.close();
return list;
}
public boolean delete(long rowId) {
return dc.delete(TABLE_CLIENT, BaseColumns._ID + "=" + rowId, null) > 0;
}
private static class OpenHelper extends SQLiteOpenHelper {
OpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase dc) {
dc.execSQL("CREATE TABLE " + TABLE_CLIENT + " (_id INTEGER PRIMARY KEY, nom_complet TEXT NOT NULL, adresse_client TEXT NOT NULL, numero_telephone TEXT NOT NULL)");
}
@Override
public void onUpgrade(SQLiteDatabase dc, int oldVersion, int newVersion) {
dc.execSQL("DROP TABLE IF EXISTS " + TABLE_CLIENT);
onCreate(dc);
}
}
}
公共类ClientDataAdapter{
私有静态最终字符串数据库\u NAME=“clientbase.db”;
私有静态最终int数据库_VERSION=1;
静态最终字符串表\u CLIENT=“clienttable”;
私有静态语境;
静态sqlitedc数据库;
私有SQLiteStatement insertStmt;
私有静态最终字符串INSERT=“插入到”
+表“客户+”(完整名称、地址、电话号码)值(?,?);
公共ClientDataAdapter(上下文){
ClientDataAdapter.context=上下文;
OpenHelper OpenHelper=新的OpenHelper(ClientDataAdapter.context);
ClientDataAdapter.dc=openHelper.getWritableDatabase();
this.insertStmt=ClientDataAdapter.dc.compileStatement(INSERT);
}
公共长插入(字符串名称完成、字符串地址客户端、字符串数字电话){
this.insertStmt.bindString(1,nom_complett);
this.insertStmt.bindString(2,adresse_客户端);
this.insertStmt.bindString(3,数字电话);
返回此.insertStmt.executeInsert();
}
public void deleteAll(){
dc.delete(TABLE_CLIENT,null,null);
}
公共阵列列表selectAll()
{
ArrayList=新建ArrayList();
Cursor Cursor=dc.query(TABLE_CLIENT,新字符串[]{“\u id”,“nom_complete”,“adresse_CLIENT”,“numero_telephone”},
空,空,空,空,“名称完整asc”);
int x=0;
if(cursor.moveToFirst()){
做{
String[]b1=新字符串[]{cursor.getString(0),cursor.getString(1),cursor.getString(2),cursor.getString(3)};
列表。添加(b1);
x=x+1;
}while(cursor.moveToNext());
}
if(cursor!=null&!cursor.isClosed()){
cursor.close();
}
cursor.close();
退货清单;
}
公共布尔删除(长rowId){
返回dc.delete(TABLE_CLIENT,BaseColumns._ID+“=”+rowId,null)>0;
}
私有静态类OpenHelper扩展了SQLiteOpenHelper{
OpenHelper(上下文){
super(上下文、数据库名称、null、数据库版本);
}
@凌驾
public void onCreate(SQLiteDatabase dc){
dc.execSQL(“创建表”+表\客户端+”(\u id整数主键,名称\完整文本不为空,地址\客户端文本不为空,数字\电话文本不为空);
}
@凌驾
public void onUpgrade(SQLiteDatabase dc、int-oldVersion、int-newVersion){
dc.execSQL(“如果存在删除表”+表\客户端);
onCreate(dc);
}
}
}
您使用_id作为列,但您没有它。您的创建查询是
@Override
public void onCreate(SQLiteDatabase dc) {
dc.execSQL("CREATE TABLE " + TABLE_CLIENT + " (id INTEGER PRIMARY KEY, nom_complet TEXT NOT NULL, adresse_client TEXT NOT NULL, numero_telephone TEXT NOT NULL)");
}
或者您在onCreate中更改查询(id
用于\u id
),或者在删除查询中使用id
public void onListItemClick(final ListView parent, View v, final int position, final long id) {
selectionc.setText("Vous êtes sur : " + stg1[position]);
AlertDialog.Builder builder = new AlertDialog.Builder(this)
.setTitle("Delete Item")
.setMessage("are you sure to delete?")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
// @-@ dm.delete(list.get(position));
dm.delete(id);
ArrayAdapter adapter = (ArrayAdapter)parent.getAdapter();
adapter.remove(stg1.get(position));
adapter.notifyDataSetChanged();
}
})
字符串[]不是提交给ArrayAdapter,而是传递ArrayList
int x = 0;
String stg = "";
stg1 = new ArrayList<String>();
for (String[] name : names2) {
stg = name[1]+" "+name[2]+ " "+name[3];
stg1.add(stg);
x++;
}
intx=0;
字符串stg=“”;
stg1=新的ArrayList();
对于(字符串[]名称:名称2){
stg=名称[1]+“”+名称[2]+“”+名称[3];
stg1.添加(stg);
x++;
}
当然,stg1必须是一个数组列表
AbstractList
,它的Itereator
不支持删除
int x = 0;
String stg = "";
stg1 = new ArrayList<String>();
for (String[] name : names2) {
stg = name[1]+" "+name[2]+ " "+name[3];
stg1.add(stg);
x++;
}
在(:)的中迭代时,不能修改该列表。将感兴趣的项目或其索引保存在另一个L中