Android 如何筛选数据库内容以填充列表视图?
正如你所看到的,这是我的列表类。我希望能够使用editText筛选此列表。关于所需查询的布局,甚至是代码片段,有人能为我指出正确的方向吗Android 如何筛选数据库内容以填充列表视图?,android,listview,filter,Android,Listview,Filter,正如你所看到的,这是我的列表类。我希望能够使用editText筛选此列表。关于所需查询的布局,甚至是代码片段,有人能为我指出正确的方向吗 public class CBFilter extends ListActivity { EditText Filter; ListView RecipeNames; Cursor cursor; CBListAdapter adapter; CBDataBaseHelper data; SQLiteDatabase data2; TextView Reci
public class CBFilter extends ListActivity {
EditText Filter;
ListView RecipeNames;
Cursor cursor;
CBListAdapter adapter;
CBDataBaseHelper data;
SQLiteDatabase data2;
TextView RecipeText, RowId;
String[] from = { CBDataBaseHelper.KEY_NAME};
int[] to = { R.id.rowText};
ImageView image;
byte[] dataImage;
BufferedInputStream buf;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
boolean diditwork;
try{
//FileInputStream in;//= openFileInput("//STEFAN-PC/Users/stefan/Desktop/Uni Work/Image.jpg");
RecipeNames = (ListView) findViewById(android.R.id.list);
RecipeNames.setTextFilterEnabled(true);
RecipeText = (TextView) findViewById(R.id.recipeText);
Filter = (EditText) findViewById(R.id.search_box);
//adapter = new SimpleCursorAdapter (this, 0, cursor, null, null);
image = (ImageView) findViewById(R.id.RecipeImage);
data = new CBDataBaseHelper(this);
data.open();
cursor = data.query();
startManagingCursor(cursor);
adapter = new CBListAdapter(this, 0, cursor, from, to);
RecipeNames.setAdapter(adapter);
adapter.notifyDataSetChanged();
Filter.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void afterTextChanged(Editable s) {
RecipeNames = (ListView) findViewById(android.R.id.list);
CBListAdapter filteradapter = (CBListAdapter)RecipeNames.getAdapter();
filteradapter.getFilter().filter(s.toString());
}
});
/*adapter.setFilterQueryProvider(new FilterQueryProvider() {
public Cursor runQuery(CharSequence constraint) {
return getDirectoryList(constraint);
}
});*/
/*adapter.setFilterQueryProvider(new FilterQueryProvider() {
public Cursor runQuery(CharSequence constraint) {
return getDirectoryList(constraint);
}
});*/
}catch(Exception e){
diditwork = false;
String error = e.toString();
Dialog d = new Dialog(this);
d.setTitle("darn");
TextView tv = new TextView(this);
tv.setText(error);
d.setContentView(tv);
d.show();
}}
/*public Cursor getDirectoryList (CharSequence constraint) {
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
queryBuilder.setTables(
CBDataBaseHelper.DATABASE_TABLE
);
String asColumnsToReturn[] = {
CBDataBaseHelper.DATABASE_TABLE + "."
+ CBDataBaseHelper.KEY_NAME
};
if (constraint == null || constraint.length () == 0) {
// Return the full list
return queryBuilder.filter(, asColumnsToReturn, null, null,
null, null, null); }
else {
String value = "%"+constraint.toString()+"%";
return data.query(CBDataBaseHelper.DATABASE_TABLE, asColumnsToReturn, "LAST_NAME like ? ", new String[]{value}, null, null, null);
}
}*/
public void CreateNew(View view){
Intent myIntent = new Intent(this, CBCreate.class);
startActivity(myIntent);
}
@Override
public void onListItemClick(ListView parent, View v, int position, long id) {
super.onListItemClick(parent, v, position, id);
Intent intent1 = new Intent(this, CBCreate.class);
long rowId = cursor.getLong(cursor.getColumnIndex(CBDataBaseHelper.KEY_ROWID));
String s = String.valueOf(rowId);
intent1.putExtra("SELECTED", s);
startActivity(intent1);
}
}
我不擅长SQLite,但我认为如果你只是放置你的过滤器 在查询中,它应该只吐回你想要的东西
public Cursor findRecipe(String filter) {
return db.query("myrecipetable", null,
"rec_recipecolumn LIKE" + filter, null, null, null, null);
}
然后对所有需要覆盖的表格进行调整。你的意思是什么?我从哪里得到它[光标]?你把方法放在哪里?是的,方法存储在哪里?在适配器类中?数据库助手类还是这个类?在任何地方都可以方便地访问数据库。我会把它放在DatabaseHelper类中。