需求：在pulltorefresh上實作購物車加減和手寫數量的功能。
先上圖
下面隻貼出擴充卡的代碼：
class MyPullListViewAdapter extends BaseAdapter {
Context context;// 上下文
private int index = -1;
public MyPullListViewAdapter(Context context) {
super();
this.context = context;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mDataLists.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return mDataLists.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
// getView什麼時候執行
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
try{
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.listview_circulate_purchase_business_all_goods,null);
holder = new ViewHolder();
/**得到各個控件的對象*/
holder.text_goods_name = (TextView) convertView.findViewById(R.id.text_goods_name);
holder.text_goods_price = (TextView) convertView.findViewById(R.id.text_goods_price);
holder.img_reduce = (ImageView) convertView.findViewById(R.id.img_reduce);
holder.img_add = (ImageView) convertView.findViewById(R.id.img_add);
holder.edit_goods_amount = (EditText) convertView.findViewById(R.id.edit_goods_amount);
convertView.setTag(holder);//綁定ViewHolder對象
}else{
holder = (ViewHolder)convertView.getTag();//取出ViewHolder對象
}
Map<String, String> m = mDataLists.get(position);
holder.text_goods_name.setText(Commons.format(m.get("GOODS_NAME")));
holder.text_goods_price.setText("單價： ￥"+Commons.format(m.get("PRICE")));
holder.edit_goods_amount.setText(Commons.format(m.get("SELECT_GOODS_NUM")));
holder.img_add.setTag(position);//儲存位置資訊
holder.img_reduce.setTag(position); //儲存位置資訊
//設定焦點變化監聽
holder.edit_goods_amount.setOnFocusChangeListener(new android.view.View.OnFocusChangeListener() {
<span style="white-space:pre"> </span>@Override
public void onFocusChange(View v, boolean hasFocus) {
<span style="white-space:pre"> </span>if (hasFocus) {
// 此處為得到焦點時的處理内容
<span style="white-space:pre"> </span>index = position;//儲存焦點的所在清單位置
} else {
// 此處為失去焦點時的處理内容
<span style="white-space:pre"> </span>String tempValue = ((EditText)v).getText().toString();
<span style="white-space:pre"> </span>int t = Integer.valueOf("".equals(tempValue) ? "1":tempValue); //擷取失去焦點時的内容
if(t > 0) {
<span style="white-space:pre"> </span>Map<String, String> tempMap = mDataLists.get(Integer.valueOf(index));
tempMap.put("SELECT_GOODS_NUM", t+""); //更新清單内容
mMyPullListViewAdapter.notifyDataSetChanged();
}
}
}
});
holder.edit_goods_amount.clearFocus();
if (index != -1 && index == position) {
// 如果目前的行下标和點選事件中儲存的index一緻，手動為EditText設定焦點。
holder.edit_goods_amount.requestFocus();
}
//點選加号方法
holder.img_add.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Map<String, String> tempMap = mDataLists.get(Integer.valueOf(arg0.getTag().toString()));
int num = Integer.valueOf(tempMap.get("SELECT_GOODS_NUM"));
tempMap.put("SELECT_GOODS_NUM", (num + 1)+"");
mMyPullListViewAdapter.notifyDataSetChanged();
}
});
//點選減号方法
holder.img_reduce.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Map<String, String> tempMap = mDataLists.get(Integer.valueOf(arg0.getTag().toString()));
int num = Integer.valueOf(tempMap.get("SELECT_GOODS_NUM"));
if(num > 1) {
tempMap.put("SELECT_GOODS_NUM", (num - 1)+"");
mMyPullListViewAdapter.notifyDataSetChanged();
}
}
});
}catch (Exception e) {
e.printStackTrace();
Logger.showToastDialog(context, "系統異常");
}
return convertView;
}
public final class ViewHolder{
public CheckBox cb_unit;
public TextView text_goods_name;
public TextView text_goods_price;
public ImageView img_reduce;
public ImageView img_add;
public EditText edit_goods_amount;
}
}
listview_circulate_purchase_business_all_goods.xml （清單項的xml檔案）
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_margin="10dp"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="0dp"
android:layout_height="100dp"
android:layout_weight="1"
android:layout_marginLeft="20dp"
android:gravity="center_vertical"
android:orientation="horizontal">
<CheckBox
android:id="@+id/cb_unit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:checked="false">
</CheckBox>
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:layout_marginLeft="30dp"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center_vertical">
<TextView
android:id="@+id/text_goods_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="xxxxxx面包"
android:singleLine="true"
android:layout_weight="1"
android:gravity="center_vertical"
android:ellipsize="end"
android:textSize="18sp"/>
<TextView
android:id="@+id/text_goods_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="單價:￥11"
android:singleLine="true"
android:gravity="center_vertical"
android:layout_weight="1"
android:ellipsize="end"
android:textColor="#ff6600"
android:textSize="18sp"/>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="100dp"
android:layout_weight="1"
android:layout_marginRight="20dp"
android:gravity="center_vertical|right"
android:orientation="horizontal">
<ImageView
android:id="@+id/img_reduce"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/shop_cart_reduce"/>
<LinearLayout
android:layout_width="70dp"
android:layout_height="40dp"
android:orientation="vertical"
android:gravity="center"
android:background="@drawable/shopping_cart_edittext">
<EditText
android:id="@+id/edit_goods_amount"
android:layout_width="70dp"
android:gravity="center"
android:layout_height="match_parent"
android:background="@null"
android:singleLine="true"
android:inputType="number"/>
</LinearLayout>
<ImageView
android:id="@+id/img_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:src="@drawable/shop_cart_add"/>
</LinearLayout>
</LinearLayout>
主要的思路就是，将數量加入到mDataLists清單資料中，每一步操作就重新整理一次清單，就可以簡單實作這個功能。