我正在尝试在列表视图上实现过滤器。我已将编辑文本放在我的列表中。我希望当我输入单词时，例如我按A显示所有起始A的名称。
//HERE IS MY DB HELPER CLASS
public class FoodDbHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "pkfood_calories.DB";
private static final int DATABASE_VERSION = 1;
private static final String CREATE_QUERY =
"CREATE TABLE "+ Food.NewDishInfo.TABLE_NAME+"("
+ Food.NewDishInfo.DISH_NAME+" TEXT NOT NULL,"
+ Food.NewDishInfo.DISH_QUANTITY+" TEXT NOT NULL,"
+ Food.NewDishInfo.DISH_CALORIE+" INTEGER,"
+ Food.NewDishInfo.DISH_FAT+" TEXT NOT NULL,"
+ Food.NewDishInfo.DISH_PROTEIN+" TEXT NOT NULL,"
+ Food.NewDishInfo.DISH_SUGAR+" TEXT NOT NULL,"
+ Food.NewDishInfo.DISH_VITAMINS+" TEXT NOT NULL);";
public FoodDbHelper(Context context)
{
super(context,DATABASE_NAME,null,DATABASE_VERSION);
Log.e("DATABASE OPERATION","Database created / opened...");
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_QUERY);
Log.e("DATABASE OPERATION","Table created...");
}
public void addInformations(String name ,String quantity, Integer calorie, String fat ,
String protein,String sugar,String vitamins, SQLiteDatabase db){
ContentValues contentValues = new ContentValues();
contentValues.put(Food.NewDishInfo.DISH_NAME,name);
contentValues.put(Food.NewDishInfo.DISH_QUANTITY,quantity);
contentValues.put(Food.NewDishInfo.DISH_CALORIE,calorie);
contentValues.put(Food.NewDishInfo.DISH_FAT,fat);
contentValues.put(Food.NewDishInfo.DISH_PROTEIN,protein);
contentValues.put(Food.NewDishInfo.DISH_SUGAR,sugar);
contentValues.put(Food.NewDishInfo.DISH_VITAMINS,vitamins);
db.insert(Food.NewDishInfo.TABLE_NAME, null, contentValues);
Log.e("DATABASE OPERATION","one row inserted...");
}
public Cursor getInformations(SQLiteDatabase db){
Cursor cursor;
String[] projections = {Food.NewDishInfo.DISH_NAME,Food.NewDishInfo.DISH_QUANTITY,
Food.NewDishInfo.DISH_CALORIE,Food.NewDishInfo.DISH_FAT,Food.NewDishInfo.DISH_PROTEIN,
Food.NewDishInfo.DISH_SUGAR, Food.NewDishInfo.DISH_VITAMINS};
cursor= db.query(Food.NewDishInfo.TABLE_NAME,projections,null,null,null,null,null);
return cursor;
}
public Cursor getFood(String dish_name,SQLiteDatabase sqLiteDatabase)
{
String[] projections = { Food.NewDishInfo.DISH_QUANTITY, Food.NewDishInfo.DISH_CALORIE, Food.NewDishInfo.DISH_FAT,
Food.NewDishInfo.DISH_PROTEIN, Food.NewDishInfo.DISH_SUGAR, Food.NewDishInfo.DISH_VITAMINS};
String selection = Food.NewDishInfo.DISH_NAME+" LIKE ?";
String[] selection_args = {dish_name};
Cursor cursor = sqLiteDatabase.query(Food.NewDishInfo.TABLE_NAME,projections,selection,selection_args,null,null,null);
return cursor;
}
这是我的数据列表活动
listView = (ListView) findViewById(R.id.list_View);
listDataAdapter = new ListDataAdapter(getApplicationContext(),
R.layout.row_layout) {
@Override
protected void showCheckedButton(int position, boolean value) {
// TODO Auto-generated method stub
DataProvider item = (DataProvider) listDataAdapter
.getItem(position);
Log.i("", "");
item.setSelected(value);
Button myButton = (Button) findViewById(R.id.findSelected);
myButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
StringBuffer responseText = new StringBuffer();
responseText
.append("The following dishes were selected...\n");
ArrayList<DataProvider> list = listDataAdapter
.getSelectedIndexes();
int sum = 0;
for (int i = 0; i < list.size(); i++) {
DataProvider dataProvider = list.get(i);
sum = sum + dataProvider.getCalorie();
responseText.append("\n" + dataProvider.getName()
+ " : " + dataProvider.getCalorie()
+ " kcal"
);
}
Toast.makeText(getApplicationContext(), ""+responseText+"\n"+"................................."
+"\n"+"Total Calories In Your Menu Is : " +sum,
Toast.LENGTH_LONG).show();
}
});
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
DataListActivity.this.listDataAdapter.getFilter().filter(cs);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
}
};
listView.setAdapter(listDataAdapter);
foodDbHelper = new FoodDbHelper(getApplicationContext());
sqLiteDatabase = foodDbHelper.getReadableDatabase();
cursor = foodDbHelper.getInformations(sqLiteDatabase);
if (cursor.moveToFirst()) {
do {
String name, quantity, fat, protein, sugar, vitamins;
boolean selected = false;
String names = null;
Integer calorie;
name = cursor.getString(0);
quantity = cursor.getString(1);
calorie = Integer.valueOf(cursor.getString(2));
fat = cursor.getString(3);
protein = cursor.getString(4);
sugar = cursor.getString(5);
vitamins = cursor.getString(6);
DataProvider dataProvider = new DataProvider(name, quantity,
calorie, fat, protein, sugar, vitamins, names, selected);
listDataAdapter.add(dataProvider);
} while (cursor.moveToNext());
}
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String name = (String) ((TextView) view
.findViewById(R.id.text_dish_name)).getText();
String quantity = (String) ((TextView) view
.findViewById(R.id.text_dish_quantity)).getText();
String calorie = (String) ((TextView) view
.findViewById(R.id.text_dish_calorie)).getText();
String fat = (String) ((TextView) view
.findViewById(R.id.text_dish_fat)).getText();
String protein = (String) ((TextView) view
.findViewById(R.id.text_dish_protein)).getText();
String sugar = (String) ((TextView) view
.findViewById(R.id.text_dish_sugar)).getText();
String vitamins = (String) ((TextView) view
.findViewById(R.id.text_dish_vitamins)).getText();
String.valueOf(parent.getItemAtPosition(position));
Toast.makeText(getApplicationContext(),
"dish name is : " + name, Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(),
Detail.class);
intent.putExtra("Dish name", name);
intent.putExtra("Dish quantity", quantity);
intent.putExtra("Dish calorie", calorie);
intent.putExtra("Dish fat", fat);
intent.putExtra("Dish protein", protein);
intent.putExtra("Dish sugar", sugar);
intent.putExtra("Dish vitamins", vitamins);
startActivity(intent);
}
});
}
这是客户适配器代码
public abstract class ListDataAdapter extends ArrayAdapter {
List list = new ArrayList();
boolean index[];
public ListDataAdapter(Context context, int resource) {
super(context, resource);
index = new boolean[list.size()];
}
static class LayoutHandler {
TextView name, quantity, calorie, fat, protein, sugar, vitamins;
CheckBox names;
}
@Override
public void add(Object object) {
super.add(object);
list.add(object);
index = new boolean[list.size()];
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View row = convertView;
LayoutHandler layoutHandler;
if (row == null) {
LayoutInflater layoutInflater = (LayoutInflater) this.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = layoutInflater.inflate(R.layout.row_layout, parent, false);
layoutHandler = new LayoutHandler();
layoutHandler.name = (TextView) row
.findViewById(R.id.text_dish_name);
layoutHandler.quantity = (TextView) row
.findViewById(R.id.text_dish_quantity);
layoutHandler.calorie = (TextView) row
.findViewById(R.id.text_dish_calorie);
layoutHandler.fat = (TextView) row.findViewById(R.id.text_dish_fat);
layoutHandler.protein = (TextView) row
.findViewById(R.id.text_dish_protein);
layoutHandler.sugar = (TextView) row
.findViewById(R.id.text_dish_sugar);
layoutHandler.vitamins = (TextView) row
.findViewById(R.id.text_dish_vitamins);
layoutHandler.names = (CheckBox) row.findViewById(R.id.checkBox1);
row.setTag(layoutHandler);
} else {
layoutHandler = (LayoutHandler) row.getTag();
}
DataProvider dataProvider = (DataProvider) this.getItem(position);
layoutHandler.name.setText(dataProvider.getName());
layoutHandler.quantity.setText(dataProvider.getQuantity());
layoutHandler.calorie
.setText(String.valueOf(dataProvider.getCalorie()));
layoutHandler.fat.setText(dataProvider.getFat());
layoutHandler.protein.setText(dataProvider.getProtein());
layoutHandler.sugar.setText(dataProvider.getSugar());
layoutHandler.vitamins.setText(dataProvider.getVitamins());
//layoutHandler.names.setChecked(dataProvider.isSelected());
layoutHandler.names.setTag(position);
layoutHandler.names.setChecked(index[position]);
layoutHandler.names
.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
int pos = (Integer) buttonView.getTag();
index[pos] = isChecked;
showCheckedButton(position, isChecked);
}
});
return row;
}
public ArrayList<DataProvider> getSelectedIndexes() {
int size = list.size();
ArrayList<DataProvider> selectedItems = new ArrayList<DataProvider>();
for (int i = 0; i < size; i++) {
DataProvider cItem = (DataProvider) list.get(i);
if (index[i]) {
selectedItems.add(cItem);
}
}
return selectedItems;
}
protected abstract void showCheckedButton(int position, boolean value);
}