Question

我能够创建一个数据库并用一些食物填充它！并在gridview中显示它们看看screenshot of my app

我想知道如何让搜索视图工作，这样当我搜索食物时，gridview也会更新!!!

第二个问题是：我为gridview中的每个子项实现了OnItemClickListener

公共类FoodList扩展了AppCompatActivity {

GridView gridView;
static ArrayList<Food> list;
FoodListAdapter adapter = null;
SearchView sv;

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

    gridView = (GridView) findViewById(R.id.gridView);

    list = new ArrayList<>();
    adapter = new FoodListAdapter(this, R.layout.food_items, list);
    gridView.setAdapter(adapter);

   // get all data from sqlite
   Cursor cursor = MainActivity.sqLiteHelper.getData("SELECT * FROM FOOD ");
    list.clear();
    while (cursor.moveToNext()){
        int id = cursor.getInt(0);
        String name = cursor.getString(1);
        String price = cursor.getString(2);
        byte[] image = cursor.getBlob(3);

        list.add(new Food(name, price, image, id));
    }
   adapter.notifyDataSetChanged();


    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {


        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Food food = list.get(position);
            Intent i = new Intent(FoodList.this,Details.class);
            i.putExtra("position", position);
            Bundle bundle = new Bundle();

            startActivity(i);
        }
    });

}

}

但是当我添加searchview时，这不会工作!!因为子项目的位置会改变，而

时它不会返回正确的位置

食物食品= list.get（position）;

这是我点击子项目时开始的活动

public class Details extends AppCompatActivity {
 int position;
Button b;
EditText edi;
ImageView im;
TextView text;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_details);

    b=(Button)findViewById(R.id.hotelbu);
    edi=(EditText)findViewById(R.id.hoteled);
    im = (ImageView)findViewById(R.id.hotelim);
    text=(TextView)findViewById(R.id.hoteltx);

    if(getIntent().getExtras() != null) {
        position = getIntent().getExtras().getInt("position", 0);
    }

    switch(position){

        case 9999:



            break;
        default:

            text.setText(FoodList.list.get(position).getName());
            edi.setText(FoodList.list.get(position).getPrice());
            break;
    }
}
}

我希望你们明白我在寻找什么，抱歉我的英语不好，感谢任何帮助谢谢你

Answer 1

您必须使用AutoCompleteTextView而不是简单的EditText。 AutoCompleteTextView是一个可编辑的文本视图，在用户输入时自动显示下拉列表中的建议列表，用户可以从中选择一个项目来替换编辑框的内容。

IMongoQuery query = Query.And(Query.EQ("memberinfo.status", "approved"));
MongoCursor mongocursor = nsdb.GetCollection(DBPrefix, "Member").Find(query);

现在创建一个扩展BaseAdapter并实现Filterable接口的适配器类，覆盖BaseAdapter的所有方法和Filterable接口的getFilter（）方法，并执行所需的所有操作。

您可以在此链接上看到AutoCompleteTextView的示例

[http://www.javatpoint.com/android-autocompletetextview-example]

这是创建AutoCompleteTextView

的xml代码

auto_complete_textview = (AutoCompleteTextView)findViewById(R.id.auto_complete_textview);

             auto_complete_textview.addTextChangedListener(new TextWatcher() {
                @Override
                public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

                }

                @Override
                public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                    adapter.getFilter().filter(charSequence.toString());
                }

                @Override
                public void afterTextChanged(Editable editable) {

                }
            });

使用searchview进行搜索时，sqlite数据库更新Gridview

1 个答案: