如何在android中使用sqlite数据库显示唯一数据?
我已经在SQLiteOpenHelper类中创建了数据库。我还在其他活动(如何在android中使用sqlite数据库显示唯一数据?,android,sqlite,Android,Sqlite,我已经在SQLiteOpenHelper类中创建了数据库。我还在其他活动(InsertActivity.java)中的按钮单击事件中插入数据库。现在,当我在listview上显示数据时,会生成两个相同的条目。如何在列表视图中显示不同的记录 ListActivity.java public class ListActivity extends Activity { ListView lv; ArrayList<String> items = new ArrayList&
InsertActivity.java
)中的按钮单击事件中插入数据库。现在,当我在listview上显示数据时,会生成两个相同的条目。如何在列表视图中显示不同的记录
ListActivity.java
public class ListActivity extends Activity {
ListView lv;
ArrayList<String> items = new ArrayList<String>();
ArrayList<String> items_id = new ArrayList<String>();
dbhelper dh;
SQLiteDatabase db;
int index_id;
Button btn;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
Button btn;
btn = (Button)findViewById(R.id.newProjectlist);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent= new Intent(ListActivity.this,NewProject.class);
startActivity(intent);
}
});
lv = (ListView)findViewById(R.id.projectListView);
setUpList();
dh = new dbhelper(this);
Cursor c = getAllData();
showAllData(c);
registerForContextMenu(lv);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
super.onCreateContextMenu(menu, v, menuInfo);
if(v.getId() == R.id.projectList){
menu.setHeaderIcon(R.drawable.ic_launcher);
menu.setHeaderTitle("Record List");
menu.add(0,1,menu.NONE,"Delete Record");
menu.add(0,2,menu.NONE,"Show Record");
}
}
@Override
public boolean onContextItemSelected(MenuItem item) {
// TODO Auto-generated method stub
int itemId = item.getItemId();
if(itemId == 1)
{
AdapterView.AdapterContextMenuInfo menuinfo = (AdapterContextMenuInfo) item.getMenuInfo();
int poistion = menuinfo.position;
String id_string = items_id.get(poistion);
long id = Long.valueOf(id_string);
//menuinfo = (AdapterContextMenuInfo) item.getMenuInfo();
//index_id = menuinfo.position;
deleteUserData(index_id);
items_id.remove(poistion);
}
if(itemId == 2){
AdapterView.AdapterContextMenuInfo menuinfo;
menuinfo = (AdapterContextMenuInfo) item.getMenuInfo();
index_id = menuinfo.position;
editUserData(index_id);
}
return super.onContextItemSelected(item);
}
private void editUserData(int indexid) {
// TODO Auto-generated method stub
String user_id = items_id.get(indexid);
Intent intEdit = new Intent(ListActivity.this, MainActivity.class);
intEdit.putExtra("EditID", user_id);
startActivityForResult(intEdit, 1);
}
private void deleteUserData(int indexid) {
// TODO Auto-generated method stub
// String user_id = items_id.get(indexid);
//Toast.makeText(getApplicationContext(), "id " + user_id, 1).show();
db = dh.getWritableDatabase();
db.delete("timer","_ID" + "=" + indexid, null);
finish();
// Toast.makeText(getApplicationContext(), "Record deleted successfully", 1).show();
}
private void showAllData(Cursor c) {
// TODO Auto-generated method stub
while(c.moveToNext())
{
int id = c.getInt(0);
String name = c.getString(1);
String timerpoint1 = c.getString(2);
String timerpoint2 = c.getString(3);
String timerpoint3 = c.getString(4);
String servicetime1 = c.getString(5);
String servicetime2 = c.getString(6);
items.add("" + name);
items_id.add(""+id);
}
setUpList();
}
private Cursor getAllData() {
// TODO Auto-generated method stub
db = dh.getReadableDatabase();
//String sortorder = dh.Name + "DESC";
// String query ="SELECT DISTINCT name FROM timer";
// Cursor c = db.rawQuery(query, null);
// if (c != null) {
// c.moveToFirst();
// }
// String[] cols = new String[] {"name"};
Cursor c = db.query(true, "timer",null,null,null,null,null,null,null);
//Cursor cur = db.query(Distinct,"timer", null, null, null, null, null, null, null);
startManagingCursor(c);
// Cursor c=db.rawQuery("select distinct Name from timer;",null);
return c;
}
private void setUpList() {
// TODO Auto-generated method stub
lv.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,items));
}
}
公共类ListActivity扩展活动{
ListView lv;
ArrayList items=新建ArrayList();
ArrayList items_id=new ArrayList();
DBDH;
sqlitedb数据库;
int-index_-id;
按钮btn;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_列表);
按钮btn;
btn=(按钮)findViewById(R.id.newProjectlist);
btn.setOnClickListener(新的OnClickListener(){
公共void onClick(视图v){
//TODO自动生成的方法存根
意向意向=新意向(ListActivity.this,NewProject.class);
星触觉(意向);
}
});
lv=(ListView)findViewById(R.id.projectListView);
setUpList();
dh=新的dbhelper(this);
游标c=getAllData();
showAllData(c);
registerForContextMenu(lv);
}
@凌驾
public void onCreateContextMenu(ContextMenu,视图v,
上下文菜单信息(menuInfo){
//TODO自动生成的方法存根
super.onCreateContextMenu(menu,v,menuInfo);
if(v.getId()==R.id.projectList){
menu.setHeaderIcon(R.drawable.ic_启动器);
菜单.设置标题(“记录列表”);
menu.add(0,1,menu.NONE,“删除记录”);
menu.add(0,2,menu.NONE,“显示记录”);
}
}
@凌驾
公共布尔值onContextItemSelected(MenuItem项){
//TODO自动生成的方法存根
int itemId=item.getItemId();
if(itemId==1)
{
AdapterView.AdapterContextMenuInfo menuinfo=(AdapterContextMenuInfo)项。getMenuInfo();
int position=menuinfo.position;
String id\u String=items\u id.get(position);
long id=long.valueOf(id\u字符串);
//menuinfo=(AdapterContextMenuInfo)项。getMenuInfo();
//索引_id=menuinfo.position;
deleteUserData(索引_id);
项目标识移除(放置);
}
if(itemId==2){
AdapterView.AdapterContextMenuInfo menuinfo;
menuinfo=(AdapterContextMenuInfo)项。getMenuInfo();
索引_id=menuinfo.position;
editUserData(索引_id);
}
返回super.onContextItemSelected(项目);
}
私有void editUserData(int indexid){
//TODO自动生成的方法存根
字符串user\u id=items\u id.get(indexid);
Intent intEdit=新的Intent(ListActivity.this,MainActivity.class);
intEdit.putExtra(“EditID”,用户id);
startActivityForResult(intEdit,1);
}
私有void deleteUserData(int indexid){
//TODO自动生成的方法存根
//字符串user\u id=items\u id.get(indexid);
//Toast.makeText(getApplicationContext(),“id”+user_id,1.show();
db=dh.getWritableDatabase();
db.delete(“计时器”,“_ID”+“=”+indexid,null);
完成();
//Toast.makeText(getApplicationContext(),“记录已成功删除”,1.show();
}
私有void showAllData(光标c){
//TODO自动生成的方法存根
while(c.moveToNext())
{
int id=c.getInt(0);
String name=c.getString(1);
String timerpoint1=c.getString(2);
String timerpoint2=c.getString(3);
String timerpoint3=c.getString(4);
字符串servicetime1=c.getString(5);
字符串servicetime2=c.getString(6);
项目。添加(“+”名称);
添加项目标识(“+id”);
}
setUpList();
}
私有游标getAllData(){
//TODO自动生成的方法存根
db=dh.getReadableDatabase();
//字符串sortorder=dh.Name+“DESC”;
//String query=“从计时器中选择不同的名称”;
//游标c=db.rawQuery(查询,空);
//如果(c!=null){
//c.移动到第一个();
// }
//字符串[]cols=新字符串[]{“名称”};
游标c=db.query(true,“timer”,null,null,null,null,null,null,null,null,null);
//cursorcur=db.query(不同的“计时器”,null,null,null,null,null,null,null,null);
开始管理光标(c);
//游标c=db.rawQuery(“从计时器中选择不同的名称;”,null);
返回c;
}
私有void setUpList(){
//TODO自动生成的方法存根
lv.setAdapter(新的ArrayAdapter(这个,android.R.layout.simple_list_item_1,items));
}
}
尝试使用分组依据
。如果仍然找不到所需的结果,请检查是否在任何地方执行sqlite查询时出错,并通知我
SELECT Name
FROM timer
GROUP BY Name
如何避免在ListView中重复输入?
避免重复使用addRecord方法()。因为当您在addRecord()中调用insert()时,只需在onClick()中定义一次addRecord(),最后就可以避免在Listview中输入相同的记录。我想您可以在查询中使用DISTINCT
来获得DISTINCT记录请给我一个该英雄的代码。。。。真的吗,你希望在7分钟内得到答案?我想知道你点比萨饼的时候会怎么做。除此之外,这里没有“请给我一个代码”;也许可以从谷歌上搜索SQL的DISTINCT
关键字开始?英雄,你建议使用DISTINCT,我已经尝试过了。请给我一些关于“如何使用android在sqlite中创建清晰的记录”的其他建议。Eric,如果你是一名优秀的程序员,那么你永远不会原谅自己,而是愚蠢地完成工作。OMG!我还没有