Question

我正在尝试从sqlite db中对listview项进行排序。

这是我到目前为止所尝试的：

 final String[] categories = {
        "Firstname", "Lastname", "Last check up"
};

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.viewallpatients);

 ArrayAdapter<String> adapter = new ArrayAdapter<String> 
        (this,android.R.layout.simple_spinner_item, categories);
    spinner = (Spinner) findViewById (R.id.spCategory);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(this);

   }

 @Override
public void onItemSelected(AdapterView<?> parent, View v, int position,
        long id) {
    // TODO Auto-generated method stub
    final String f = parent.getItemAtPosition(position).toString();

    switch(position){
    case 0:
        ca.setFilterQueryProvider(new FilterQueryProvider() {
             public Cursor runQuery(CharSequence constraint) {
                 return dbHelper.sortByFirstname(f);
             }
        }); 

        break;
    case 1:
        ca.setFilterQueryProvider(new FilterQueryProvider() {
             public Cursor runQuery(CharSequence constraint) {
                 return dbHelper.sortByLastname(f);
             }
      }); 
        break;
    case 2:
        ca.setFilterQueryProvider(new FilterQueryProvider() {
             public Cursor runQuery(CharSequence constraint) {
                 return dbHelper.fetchPatientsByName(constraint.toString());
             }
      }); 
        break;
    }
}

DBHelper.class

   public Cursor sortByFirstname(CharSequence inputText) throws SQLException {

      Cursor mCursor = null;
      if (inputText == null  ||  inputText.length () == 0)  {
       mCursor = myDataBase.query(DB_TABLE, new String[] { 
               KEY_ID, KEY_FNAME, KEY_LNAME, KEY_DIAGNOSIS, KEY_LASTFFUP },
         null, null, null, null, null);

      }
      else {
       mCursor = myDataBase.query(true, DB_TABLE, new String[] { 
               KEY_ID, KEY_FNAME, KEY_LNAME, KEY_DIAGNOSIS, KEY_LASTFFUP  },
         KEY_FNAME + " like '%" + inputText + "%'", null,
         null, null, "FirstName asc", null);
      }
      if (mCursor != null) {
       mCursor.moveToFirst();
      }
      return mCursor;

}

public Cursor sortByLastname(CharSequence inputText) throws SQLException {

      Cursor mCursor = null;
      if (inputText == null  ||  inputText.length () == 0)  {
       mCursor = myDataBase.query(DB_TABLE, new String[] { 
               KEY_ID, KEY_FNAME, KEY_LNAME, KEY_DIAGNOSIS, KEY_LASTFFUP },
         null, null, null, null, null);

      }
      else {
       mCursor = myDataBase.query(true, DB_TABLE, new String[] { 
               KEY_ID, KEY_FNAME, KEY_LNAME, KEY_DIAGNOSIS, KEY_LASTFFUP  },
         KEY_FNAME + " like '%" + inputText + "%'", null,
         null, null, "LastName asc", null);
      }
      if (mCursor != null) {
       mCursor.moveToFirst();
      }
      return mCursor;

}

基本上，用户可以通过firstname，lastname或last check up从微调器中选择来对列表进行排序。我试过上面的代码无济于事。我不知道代码有什么问题？还是我错过了什么？有什么想法吗？非常感谢帮助。感谢。

Answer 1

试试这个

mCursor = myDataBase.query(DB_TABLE, new String[] { 
               KEY_ID, KEY_FNAME, KEY_LNAME, KEY_DIAGNOSIS, KEY_LASTFFUP },
         null, null, null, null, KEY_LNAME + " ASC");

更多细节Here

Answer 2

试试这个：

mCursor = myDataBase.query(true, DB_TABLE, new String[] { 
               KEY_ID, KEY_FNAME, KEY_LNAME, KEY_DIAGNOSIS, KEY_LASTFFUP  },
         KEY_FNAME + " like '%" + inputText + "%'", null,
         null, null, "FirstName ASC", null);

希望它能帮助!!

从sqlite android排序listview项目

2 个答案: