我很难搞清楚这个，我需要能够点击列表视图中的项目，并将该项目移动到列表的底部，并进行一些背景颜色更改以产生影响，然后如果点击后退，则将其返回到列表中的原始位置。
我已经尝试过list.addFooterView（）但是我不能让它以这种方式工作，它只是将一个空项目附加到页脚，我无法让它回到原来的位置。
到目前为止，这是我的代码。关于如何解决这个问题的任何想法都值得赞赏。
ActivityProductsBuy.java
package com.roneskinder;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import com.roneskinder.model.DataProducts;
import com.roneskinder.utils.DatabaseHandler;
import com.roneskinder.x111.R;
public class ActivityProductsBuy extends Activity {
protected Context mContext;
protected DatabaseHandler db;
private SQLiteDatabase newDB;
private String tableProducts = DatabaseHandler.TABLE_PRODUCTS;
protected ListView lvProducts;
protected String title, idProduct, idGroceryList, ProductCode, ProductName;
protected int totalItems, itemsInCart = 0;
protected Button btn_itemsInCart;
protected TextView tv_percentText;
/** The data used for products */
private List<DataProducts> info;
/** The Adapter holds the listview. */
private ProductsItemAdapter adapter1;
private static final int ZBAR_SCANNER_REQUEST = 0;
protected SharedPreferences preferences;
protected String TAG = ActivityProductsBuy.class.getName();
ImageView imgHolder;
Paint paint;
EditText edtPercentage;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_products_buy);
mContext = getApplicationContext();
// Get Database values for User
db = new DatabaseHandler(mContext);
preferences = PreferenceManager.getDefaultSharedPreferences(this);
// remove and add products to DB
//db.removeAllProducts();
// this.addProducts();
// get intent Extras (the title, list id)
//title = getIntent().getExtras().getString("title");
idGroceryList = getIntent().getExtras().getString("idGroceryList");
lvProducts = (ListView) findViewById(R.id.lvProducts);
info = new ArrayList<DataProducts>();
imgHolder = (ImageView) findViewById(R.id.coringImage);
btn_itemsInCart = (Button) findViewById(R.id.btn_itemsInCart);
tv_percentText = (TextView) findViewById(R.id.percentText);
tv_percentText.setText("0%");
paint = new Paint();
adapter1 = new ProductsItemAdapter(this, info);
// load all database products into listview
lvProducts.setAdapter(adapter1);
loadProducts();
totalItems = adapter1.getCount();
lvProducts.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
itemsInCart++;
if(itemsInCart <= totalItems){
btn_itemsInCart.setText("(" + itemsInCart + "/"+ totalItems +")");
// Fill percentage of image
float percentage = ((float)itemsInCart/(float)totalItems)*100;
Log.d(TAG, "percentage: " + percentage);
imgHolder.setImageResource(R.drawable.cart_default);
if (percentage > 0 && percentage <= 100) {
imgHolder.setImageBitmap(doBottomToTopOperation(Math.round(percentage)));
tv_percentText.setText((int)percentage + "%");
}
}
}
});
}
public void loadProducts() {
info.clear();
((BaseAdapter) lvProducts.getAdapter()).notifyDataSetChanged();
Cursor cur = null;
try {
newDB = db.getWritableDatabase();
cur = newDB.rawQuery(
"SELECT idProduct, ProductCode, name FROM "
+ tableProducts + " WHERE idGroceryList = " + idGroceryList, null);
Log.d(TAG, DatabaseUtils.dumpCursorToString(cur));
if (cur != null) {
// tvNoProducts.setVisibility(View.GONE);
if (cur.moveToFirst()) {
do {
idProduct = cur.getString(cur.getColumnIndex("idProduct"));
ProductCode = cur.getString(cur.getColumnIndex("ProductCode"));
ProductName = cur.getString(cur.getColumnIndex("name"));
info.add(new DataProducts(ProductName, ProductCode,idProduct, "Vegetales", "0", idGroceryList));
} while (cur.moveToNext());
}
} else {
// tvNoProducts.setVisibility(View.VISIBLE);
}
} catch (SQLiteException se) {
Log.e(getClass().getSimpleName(),
"Could not create or Open the database");
}
}
/**
* The Class ProductsItemAdapter.
*/
private class ProductsItemAdapter extends BaseAdapter {
/** The context. */
private Context context;
/** The list. */
private List<DataProducts> list;
/** The inflater. */
private LayoutInflater inflater;
/**
* Instantiates a new deal item adapter.
*
* @param context
* the context
* @param list
* the list
*/
public ProductsItemAdapter(Context context, List<DataProducts> list) {
this.context = context;
this.list = list;
}
/*
* (non-Javadoc)
*
* @see android.widget.Adapter#getCount()
*/
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
/*
* (non-Javadoc)
*
* @see android.widget.Adapter#getItem(int)
*/
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
/*
* (non-Javadoc)
*
* @see android.widget.Adapter#getItemId(int)
*/
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
/*
* (non-Javadoc)
*
* @see android.widget.Adapter#getView(int, android.view.View,
* android.view.ViewGroup)
*/
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.adapter_products, null);
}
TextView txt1 = (TextView) convertView
.findViewById(R.id.tvProductName);
TextView txt2 = (TextView) convertView
.findViewById(R.id.tvProductCode);
TextView tv1 = (TextView) convertView
.findViewById(R.id.tvProductPrice);
TextView tv2 = (TextView) convertView
.findViewById(R.id.tvProductCategory);
final DataProducts dInfo = list.get(position);
txt1.setText(dInfo.getProductName());
txt2.setText(dInfo.getProductCode());
tv1.setText(dInfo.getProductPrice());
// tv1.setPaintFlags(tv1.getPaintFlags() |
// Paint.STRIKE_THRU_TEXT_FLAG);
tv2.setText(dInfo.getProductCategory());
return convertView;
}
}
public Bitmap doBottomToTopOperation(int percentage) {
Bitmap bitmapOriginal = ((BitmapDrawable) imgHolder.getDrawable()).getBitmap();
Bitmap bitmapTarget = BitmapFactory.decodeResource(getResources(), R.drawable.cart_filled);
int heightToCrop = bitmapTarget.getHeight() * (100 - percentage) / 100;
Bitmap croppedBitmap = Bitmap.createBitmap(bitmapTarget, 0, heightToCrop, bitmapTarget.getWidth(), bitmapTarget.getHeight() - heightToCrop);
Bitmap bmOverlay = Bitmap.createBitmap(bitmapOriginal.getWidth(),
bitmapOriginal.getHeight(), bitmapOriginal.getConfig());
Canvas canvas = new Canvas(bmOverlay);
canvas.drawBitmap(bitmapOriginal, new Matrix(), null);
canvas.drawBitmap(croppedBitmap,
canvas.getWidth() - croppedBitmap.getWidth(),
canvas.getHeight() - croppedBitmap.getHeight(), null);
return bmOverlay;
}
}
activity_products_buy.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<com.sothree.slidinguppanel.SlidingUpPanelLayout
xmlns:sothree="http://schemas.android.com/apk/res-auto"
android:id="@+id/sliding_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
sothree:umanoPanelHeight="68dp"
sothree:umanoShadowHeight="4dp" >
<!-- MAIN LAYOUT -->
<ListView
android:id="@+id/lvProducts"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/myFilter" >
</ListView>
<!-- SLIDING LAYOUT -->
<LinearLayout
android:id="@+id/dragView"
android:layout_width="match_parent"
android:layout_height="250dp"
android:background="#ffffff"
android:clickable="true"
android:focusable="false"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="68dp"
android:background="#f0f0f0"
android:orientation="horizontal" >
<TextView
android:id="@+id/name"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center_vertical"
android:paddingLeft="10dp"
android:text="Total de Productos en el carrito"
android:textColor="#000"
android:textSize="14sp" />
<Button
android:id="@+id/btn_itemsInCart"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center_vertical|right"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:text="(0)"
android:textColor="#000"
android:textSize="14sp" />
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/coringImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="@drawable/cart_default" />
<TextView
android:id="@+id/percentText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/coringImage"
android:layout_alignLeft="@+id/coringImage"
android:layout_alignRight="@+id/coringImage"
android:layout_alignTop="@+id/coringImage"
android:layout_margin="1dp"
android:gravity="center"
android:text="0%"
android:textColor="#ffffff" />
</RelativeLayout>
</LinearLayout>
</com.sothree.slidinguppanel.SlidingUpPanelLayout>
</RelativeLayout>
adapter_products.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/top"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:orientation="horizontal"
android:paddingLeft="@dimen/pad_10dp"
android:paddingRight="@dimen/pad_10dp"
android:paddingTop="@dimen/pad_15dp" >
<LinearLayout
android:id="@+id/left_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageView
android:id="@+id/item_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="@dimen/pad_10dp"
android:src="@drawable/icon_mypurchase1" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingLeft="@dimen/pad_10dp" >
<LinearLayout
android:id="@+id/right_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/tvProductName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Nombre del Producto" />
<TextView
android:id="@+id/tvProductCode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="@dimen/pad_2.5dp"
android:text="Codigo" />
</LinearLayout>
<View
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="right"
android:orientation="vertical" >
<TextView
android:id="@+id/tvProductPrice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/$45"
android:textColor="@color/red_main"
android:textSize="@dimen/txt_18sp" />
<TextView
android:id="@+id/tvProductCategory"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Categoria"
android:textSize="@dimen/txt_12sp" />
</LinearLayout>
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="@dimen/pad_15dp"
android:background="@color/my_purchase_list_sap" />
</LinearLayout>
</LinearLayout>
答案 0 :(得分：2)
只需更改数据源中项目的索引，然后notifyDataSetChanged()
DataProducts item = info.get(<index>);
info.remove(<index>);
info.add(item);
adapter1.notifyDataSetChanged();
在getView，
if (position==getCount()-1){
convertView.setBackground(<backgroud>);
}
如果你想把它移回去，
DataProducts item = info.get(info.size()-1);
info.remove(info.size()-1);
info.add(<original_index>,item);
adapter1.notifyDataSetChanged();