Android开发-实现pulltorefresh上类似购物车加减方法和EditText焦点问题的解决方法

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什么时候执行
@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();
/**得到各个控件的对象*/
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);//绑定ViewHolder对象

}else{
holder = (ViewHolder)convertView.getTag();//取出ViewHolder对象
}

Map<String, String> m = mDataLists.get(position);
holder.text_goods_name.setText(Commons.format(m.get("GOODS_NAME")));
holder.text_goods_price.setText("单价： ￥"+Commons.format(m.get("PRICE")));
holder.edit_goods_amount.setText(Commons.format(m.get("SELECT_GOODS_NUM")));
holder.img_add.setTag(position);//保存位置信息
holder.img_reduce.setTag(position); //保存位置信息

//设置焦点变化监听
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) {
// 此处为得到焦点时的处理内容
<span style="white-space:pre">	</span>index = position;//保存焦点的所在列表位置
} else {
// 此处为失去焦点时的处理内容
<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); //获取失去焦点时的内容
if(t > 0) {
<span style="white-space:pre">	</span>Map<String, String> tempMap = mDataLists.get(Integer.valueOf(index));
tempMap.put("SELECT_GOODS_NUM", t+""); //更新列表内容
mMyPullListViewAdapter.notifyDataSetChanged();
}
}
}
});

holder.edit_goods_amount.clearFocus();
if (index != -1 && index == position) {
// 如果当前的行下标和点击事件中保存的index一致，手动为EditText设置焦点。
holder.edit_goods_amount.requestFocus();
}

//点击加号方法
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();
}
});
//点击减号方法
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, "系统异常");
}
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;
}
}

<?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="单价:￥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
8f09
:src="@drawable/shop_cart_add"/>
</LinearLayout>
</LinearLayout>