Wie kann ich Listview-Elemente anzeigen, wenn Edittext für die Suche leer ist?

Question

Ich konnte nicht den Weg finden, um Listview mit Elementen zu füllen, wenn Edittext gelöscht wird und es keinen Wert für die Suche gibt. Als ich Log zum Anzeigen der Werte beim Eingeben von Zeichen verwendet habe, habe ich gesehen, dass das letzte Zeichen auch dann noch erhalten bleibt, wenn ich die editedtext-Werte gelöscht habe.

Ich setze Bedingung, als ob edittext.length() gleich 0 für die Überwachung von Listview-Elementen ist, wenn die Aktivitätsklasse onstart() -Methode ist. Nachdem ich etwas geschrieben und dann gelöscht habe, wird listview leer angezeigt. Hier ist mein Code-Blöcke:

public class ProductListActivity extends Activity { 

    public static final String TAG = ProductListActivity.class.getSimpleName(); 

    private static final String Valeron_URL = "http://www.tac.com.tr/valeron.xml"; 

    ProductListAdapter productListAdapter; 
    ListView lvProducts; 
    EditText lblSearch; 
    private List<Product> productList = null; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_productlist_temp); 
     new ProductDownloaderTask(this).execute(Valeron_URL); 
     initializeComponents(); 
    } 

    private void initializeComponents() { 
     lvProducts = (ListView) findViewById(R.id.lvProducts); 
     lblSearch = (EditText) findViewById(R.id.lblSearch); 
    } 

    public void updateProducts(List<Product> products) { 
     productListAdapter = new ProductListAdapter(this, products); 
     lvProducts.setAdapter(productListAdapter); 

     lblSearch.addTextChangedListener(new TextWatcher() { 
      @Override 
      public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

      } 

      @Override 
      public void onTextChanged(CharSequence s, int start, int before, int count) { 

      } 

      @Override 
      public void afterTextChanged(Editable s) { 
       String text = lblSearch.getText().toString().toLowerCase(Locale.getDefault()); 
       productListAdapter.filter(text); 
      } 
     }); 
    } 
} 

Und hier

public class ProductListAdapter extends BaseAdapter { 

    private ProductListActivity listActivity; 
    private LayoutInflater layoutInflater; 
    private List<Product> products = null; 
    ArrayList<Product> productList; 


    public ProductListAdapter(ProductListActivity listActivity, List<Product> products) { 
     this.listActivity = listActivity; 
     this.layoutInflater = listActivity.getLayoutInflater(); 
     this.products = products; 
     this.productList = new ArrayList<Product>(); 
     this.productList.addAll(products); 
    } 

    @Override 
    public int getCount() { 
     return products.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return products.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
     View view = layoutInflater.inflate(R.layout.activity_productlist, parent, false); 
     ImageView iwProduct = (ImageView) view.findViewById(R.id.iwProduct); 
     TextView lblProductInfo = (TextView) view.findViewById(R.id.lblProductInfo); 
     TextView lblProductColor = (TextView) view.findViewById(R.id.lblProductColor); 
     final Product currentProduct = products.get(position); 
     iwProduct.setImageBitmap(currentProduct.getProductImage()); 
     lblProductInfo.setText(currentProduct.getProductName()); 
     lblProductColor.setText(currentProduct.getProductColor()); 
     view.setTag(currentProduct); 
     view.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View arg0) { 
       final Product currentProduct = products.get(position); 
       Intent intent = new Intent(listActivity, ProductDetailActivity.class); 
       intent.putExtra("productID", currentProduct.getProductId()); 
       intent.putExtra("productSKU", currentProduct.getProductSKU()); 
       intent.putExtra("productName", currentProduct.getProductName()); 
       intent.putExtra("productColor", currentProduct.getProductColor()); 
       intent.putExtra("productPrice", String.valueOf(currentProduct.getProductPrice())); 
       intent.putExtra("productSizeDetail", currentProduct.getProductSizeDetail()); 
       listActivity.startActivity(intent); 
      } 
     }); 
     return view; 
    } 

    public void filter(String text) { 
      text = text.toLowerCase(Locale.getDefault()); 
      products.clear(); 
      if (text.length() == 0) { 
       this.products.addAll(products); 
      } else { 
       for (Product product : products) { 
        if (product.getProductName().toLowerCase(Locale.getDefault()) 
          .contains(text)) { 
         this.products.add(product); 
        } 
       } 
      } 
     notifyDataSetChanged(); 
    } 
} 

Wie kann ich es lösen?

Answer 1

Ihre filter() Methode scheint nicht OK.

Aktualisieren Sie Ihre ProductListAdapter wie folgt:

public class ProductListAdapter extends BaseAdapter { 

private ProductListActivity listActivity; 
private LayoutInflater layoutInflater; 
private List<Product> products; 
private List<Product> productList; 


public ProductListAdapter(ProductListActivity listActivity, List<Product> products) { 
    this.listActivity = listActivity; 
    this.layoutInflater = listActivity.getLayoutInflater(); 
    this.products = products; 
    this.productList = new ArrayList<Product>(); 
    this.productList.addAll(products); 
} 

@Override 
public int getCount() { 
    return products.size(); 
} 

@Override 
public Object getItem(int position) { 
    return products.get(position); 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    View view = layoutInflater.inflate(R.layout.activity_productlist, parent, false); 
    ImageView iwProduct = (ImageView) view.findViewById(R.id.iwProduct); 
    TextView lblProductInfo = (TextView) view.findViewById(R.id.lblProductInfo); 
    TextView lblProductColor = (TextView) view.findViewById(R.id.lblProductColor); 
    final Product currentProduct = products.get(position); 
    iwProduct.setImageBitmap(currentProduct.getProductImage()); 
    lblProductInfo.setText(currentProduct.getProductName()); 
    lblProductColor.setText(currentProduct.getProductColor()); 
    view.setTag(currentProduct); 
    view.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View arg0) { 
      final Product currentProduct = products.get(position); 
      Intent intent = new Intent(listActivity, ProductDetailActivity.class); 
      intent.putExtra("productID", currentProduct.getProductId()); 
      intent.putExtra("productSKU", currentProduct.getProductSKU()); 
      intent.putExtra("productName", currentProduct.getProductName()); 
      intent.putExtra("productColor", currentProduct.getProductColor()); 
      intent.putExtra("productPrice", String.valueOf(currentProduct.getProductPrice())); 
      intent.putExtra("productSizeDetail", currentProduct.getProductSizeDetail()); 
      listActivity.startActivity(intent); 
     } 
    }); 
    return view; 
} 

public void filter(String text) { 
     text = text.toLowerCase(Locale.getDefault()); 
     products.clear(); 
     if (text.length() == 0) { 
      this.products.addAll(productList); 
     } else { 
      for (Product product : productList) { 
       if (product.getProductName().toLowerCase(Locale.getDefault()) 
         .contains(text)) { 
        this.products.add(product); 
       } 
      } 
     } 
    notifyDataSetChanged(); 
}