本文实例讲述了Android开发实现可拖动排序的ListView功能。分享给大家供大家参考,具体如下:
一、上图
二、简述
1、需要实现的效果是长按右侧可拖动部分布局实现列表项的拖动排序
2、当点击列表项前面的单选按钮时,在该条目右侧显示删除图标,点击该图标删除当前条目。
三、实现思路
借助github上的开源代码drag-sort-listview-master加以改造。
四、主要源码展示
1、Activity代码
package com.gengducun.dslvdemo; import java.util.ArrayList; import android.app.Activity; import android.os.Bundle; import android.widget.ListView; import com.mobeta.android.dslv.DragSortListView; public class MainActivity extends Activity { protected static final String TAG = "MainActivity"; /**产品信息列表**/ private ArrayList<ProductInfoBean> productInfoList; /**产品列表控件**/ private DragSortListView mDslvProductList; /**产品信息列表*/ private ProductListAdapter mProductListAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mDslvProductList = (DragSortListView) findViewById(R.id.dslv_product_list); initProductList(); mProductListAdapter = new ProductListAdapter(productInfoList, this); mDslvProductList.setAdapter(mProductListAdapter); mDslvProductList.setDropListener(onDrop); mDslvProductList.setChoiceMode(ListView.CHOICE_MODE_SINGLE); } private DragSortListView.DropListener onDrop = new DragSortListView.DropListener() { @Override public void drop(int from, int to) { if (from != to) { ProductInfoBean item = (ProductInfoBean) mProductListAdapter.getItem(from); mProductListAdapter.remove(item); mProductListAdapter.insert(item,from, to); mDslvProductList.moveCheckState(from, to); } } }; private void initProductList() { productInfoList = new ArrayList<ProductInfoBean>(); ProductInfoBean productInfo1 = new ProductInfoBean("EURUSD1"); ProductInfoBean productInfo2 = new ProductInfoBean("EURUSD2"); ProductInfoBean productInfo3 = new ProductInfoBean("EURUSD3"); ProductInfoBean productInfo4 = new ProductInfoBean("EURUSD4"); ProductInfoBean productInfo5 = new ProductInfoBean("EURUSD5"); ProductInfoBean productInfo6 = new ProductInfoBean("EURUSD6"); ProductInfoBean productInfo7 = new ProductInfoBean("EURUSD7"); productInfoList.add(productInfo1); productInfoList.add(productInfo2); productInfoList.add(productInfo3); productInfoList.add(productInfo4); productInfoList.add(productInfo5); productInfoList.add(productInfo6); productInfoList.add(productInfo7); } }
2、Adapter代码
package com.gengducun.dslvdemo; import java.util.ArrayList; import android.content.Context; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.RadioButton; import android.widget.TextView; public class ProductListAdapter extends BaseAdapter { private static final String TAG = "ProductListAdapter1"; /**产品信息列表*/ private ArrayList<ProductInfoBean> productInfoList; /**上下文*/ private Context mContext; /**布局加载器*/ private LayoutInflater mInflater; /**布局缓存*/ private ViewHolder mHolder; /**本类适配器对象**/ private ProductListAdapter mProductListAdapter1; /**选中项位置**/ private int mSelectPosition = -1; public ProductListAdapter(ArrayList<ProductInfoBean> productInfoList, Context context) { super(); this.productInfoList = productInfoList; this.mContext = context; this.mInflater = LayoutInflater.from(context); this.mProductListAdapter1 = this; } @Override public int getCount() { return null == productInfoList ? 0 : productInfoList.size(); } @Override public Object getItem(int position) { return productInfoList.get(position); } @Override public long getItemId(int position) { return position; } public int getmSelectPosition() { return mSelectPosition; } public void setmSelectPosition(int mSelectPosition) { this.mSelectPosition = mSelectPosition; } /** * 删除产品 * @param productInfoBean */ public void remove(ProductInfoBean productInfoBean) { synchronized (this) { productInfoList.remove(productInfoBean); } notifyDataSetChanged(); } /** * 将产品移动到指定的位置 * @param productInfoBean * @param from 移动之前的位置 * @param to 移动完成之后,该产品所在的位置 */ public void insert(ProductInfoBean productInfoBean, int from, int to) { synchronized (this) { Log.i(TAG, "from=" + from + " to =" + to); if (mSelectPosition != -1) {//有选中项的前提下 if ((from < mSelectPosition && to < mSelectPosition) || (from > mSelectPosition && to > mSelectPosition)) { //在选中项之前的位置进行拖拉或者在选中项之后的区域拖拉,不会影响选中项 } else if (from < mSelectPosition && to > mSelectPosition) { //将选中项之前的移动到选中项之后的位置,则选中项的索引需要发生变化,应该是选中项的位置-1 mSelectPosition = mSelectPosition - 1; } else if (from > mSelectPosition && to < mSelectPosition) { //将选中项之后的项移动到选中项之前的位置,索引也需要变化,应该是选中项的位置+1 mSelectPosition = mSelectPosition + 1; } else if ((from == mSelectPosition && from > to) || (from == mSelectPosition && from < to)) { //如果将选中项往选中项前面的方向拖,则选中项的索引也需要变化,应该是拖动到的位置 mSelectPosition = to; } else if ((from < mSelectPosition && to == mSelectPosition)) { //将选中项之前的移动到当前选中项的位置,索引需要变化,选中项的索引应该是 选中项的值-1 mSelectPosition = mSelectPosition - 1; } else if (from > mSelectPosition && to == mSelectPosition) { //将选中项之后的移动到当前项的位置,索引需要变化,选中项的索引应该是选中项的值+1 mSelectPosition = mSelectPosition + 1; } } productInfoList.add(to, productInfoBean); } notifyDataSetChanged(); } @Override public View getView(int position, View convertView, ViewGroup parent) { if (null == convertView) { convertView = mInflater.inflate(R.layout.list_item_product_list_1, null); mHolder = new ViewHolder(); mHolder.rbSelect = (RadioButton) convertView.findViewById(R.id.rb_select); mHolder.tvPurductName = (TextView) convertView.findViewById(R.id.tv_product_name); mHolder.llDragLayout = (LinearLayout) convertView.findViewById(R.id.drag_handle); mHolder.ivDrag = (ImageView) convertView.findViewById(R.id.iv_drag); mHolder.ivDeleteProduct = (ImageView) convertView.findViewById(R.id.iv_product_delete); convertView.setTag(mHolder); } else { mHolder = (ViewHolder) convertView.getTag(); } ProductInfoBean productInfoBean = productInfoList.get(position); if (null != productInfoBean) { //设置单选按钮的选中状态 if (mSelectPosition == position) { mHolder.rbSelect.setChecked(true); mHolder.ivDrag.setVisibility(View.GONE); mHolder.ivDeleteProduct.setVisibility(View.VISIBLE); mHolder.ivDeleteProduct.setOnClickListener(new RemoveItemClickListener(mSelectPosition)); } else { mHolder.rbSelect.setChecked(false); mHolder.ivDrag.setVisibility(View.VISIBLE); mHolder.ivDeleteProduct.setVisibility(View.GONE); } mHolder.rbSelect.setOnClickListener(new ProductClickListener(position)); //设置产品名称 if (null != productInfoBean.getProductName() && !("".equals(productInfoBean.getProductName()))) { mHolder.tvPurductName.setText(productInfoBean.getProductName()); } } return convertView; } class ViewHolder { RadioButton rbSelect; TextView tvPurductName; LinearLayout llDragLayout; ImageView ivDrag; ImageView ivDeleteProduct; } /** * 单选按钮事件监听 * @author Wilson */ class ProductClickListener implements OnClickListener { private int position; public ProductClickListener(int position) { super(); this.position = position; } @Override public void onClick(View v) { if (mSelectPosition == position) { mSelectPosition = -1; } else { mSelectPosition = position; } Log.i(TAG, "mSelectPosition=" + mSelectPosition + " position=" + position); mProductListAdapter1.notifyDataSetChanged(); } } /** * 删除当前产品项监听事件 */ class RemoveItemClickListener implements OnClickListener { private int position; public RemoveItemClickListener(int position) { super(); this.position = position; } @Override public void onClick(View v) { //1、删除集合中的数据 productInfoList.remove(position); //2、删除服务器端的数据 mProductListAdapter1.notifyDataSetChanged(); // mSelectPosition = -1; } } }
四、源码
完整实例代码点击此处本站下载。
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希望本文所述对大家Android程序设计有所帮助。
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