这是我的自定义ListViewAdapter
public class ListViewAdapter extends BaseAdapter{
Viewholder holder;
public ArrayList<HashMap<?, ?>>list;
public ArrayList<Integer> add;
Activity activity;
boolean [] checkedItems;
String []ckboxTextAdd;
DbAdapter db;
/*
* Constructor Calling
*/
public ListViewAdapter(Activity activity,ArrayList<HashMap<? , ?>>list) {
// TODO Auto-generated constructor stub
super();
this.activity=activity;
this.list=list;
add=new ArrayList<Integer>(list.size());
db=new DbAdapter(activity);
db.open();
checkedItems= new boolean[list.size()];
ckboxTextAdd=new String[list.size()];
for(int i=0;i<list.size();i++)
{
checkedItems[i]=false;
ckboxTextAdd[i]="Add";
}
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(final int position, View convertview, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater layoutInflater=activity.getLayoutInflater();
final HashMap<?, ?> map=list.get(position);
if(convertview==null)
{
convertview=layoutInflater.inflate(R.layout.l_view,parent,false);
holder = new Viewholder();
holder.title=(TextView) convertview.findViewById(R.id.serving_size_grams);
holder.servingsize=(TextView) convertview.findViewById(R.id.tvprotiendesclabel);
holder.Fiber=(TextView)convertview.findViewById(R.id.Fiberview);
holder.carbs=(TextView)convertview.findViewById(R.id.carbsview);
holder.sodium=(TextView)convertview.findViewById(R.id.sodiumview);
holder.proteins=(TextView)convertview.findViewById(R.id.Protienview);
holder.calories=(TextView)convertview.findViewById(R.id.caloriesview);
holder.img_serve_size=(ImageView)convertview.findViewById(R.id.image_serve_eqivalent);
holder.calories_val=(TextView)convertview.findViewById(R.id.cal_desc_val);
holder.Fiber_val=(TextView)convertview.findViewById(R.id.Fiber_desc_val);
holder.sodium_val=(TextView)convertview.findViewById(R.id.sodium_desc_val);
holder.proteins_val=(TextView)convertview.findViewById(R.id.prot_desc_val);
holder.carbs_val=(TextView)convertview.findViewById(R.id.carbs_desc_val);
holder.tvbrand=(TextView)convertview.findViewById(R.id.item_brand_name);
holder.ckbox=(CheckBox)convertview.findViewById(R.id.save_item_box);
holder.tvckboxText=(TextView)convertview.findViewById(R.id.ckboxAdd);
convertview.setTag(holder);
}
else
{
holder=(Viewholder)convertview.getTag();
}
holder.ckbox.setOnCheckedChangeListener(null);
holder.ckbox.setChecked(checkedItems[position]);
holder.tvckboxText.setText(ckboxTextAdd[position]);
holder.ckbox.setTag(R.id.save_item_box, position);
//On Check Box Check Events
holder.ckbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(final CompoundButton buttonview, boolean isChecked) {
// TODO Auto-generated method stub
final int position = (Integer) buttonview
.getTag(R.id.save_item_box);
if (isChecked)
{
Log.i(String.valueOf(position), String.valueOf(isChecked));
checkedItems[position] = true;
ckboxTextAdd[position]="Added";
//holder.ckbox.setText(ckboxTextAdd[position]);
Log.i("value of Somple List", list.get(position).toString());
Log.i("value of listitr", list.get(position).toString());
Log.i("value of text box",ckboxTextAdd[position]);
final HashMap<?, ?> map=list.get(position);
map.get(Constants.NF_CALORIES);
String item_name =map.get(Constants.ITEM_NAME).toString().replace('\'', ' ');
String brand_name =map.get(Constants.BRAND_NAME).toString().replace('\'',' ');
Cursor cursor= db.fetch_data(item_name,brand_name);
if(cursor.getCount()>0)
{
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setMessage("Already Saved")
.setPositiveButton("Replace", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
checkedItems[position] = true;
ckboxTextAdd[position]="Added";
Log.i("value of text box trey",ckboxTextAdd[position]);
// holder.ckbox.setText(ckboxTextAdd[position]);
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
checkedItems[position] = false;
ckboxTextAdd[position]="Add";
Log.i("value of text box false",ckboxTextAdd[position]);
//holder.ckbox.setText(ckboxTextAdd[position]);
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
else
{
Log.i("value of Calories",map.get(Constants.NF_CALORIES).toString());
db.createSave(
position
,brand_name
,item_name
,map.get("path").toString()
,map.get(Constants.NF_SERVING_SIZE_QTY).toString()
,map.get(Constants.NF_SERVING_SIZE_UNIT).toString()
,map.get(Constants.NF_CALORIES).toString()
,map.get(Constants.NF_PROTEINS).toString()
,map.get(Constants.NF_SODIUM).toString()
,map.get(Constants.NF_TOTAL_FAT).toString()
,map.get(Constants.NF_TOTAL_CARBOHYDRATES).toString()
,map.get(Constants.NF_SATURATED_FAT).toString()
,map.get(Constants.NF_CHOLESTEROL).toString()
,map.get(Constants.NF_VITAMIN_A).toString()
,map.get(Constants.NF_VITAMIN_C).toString()
,map.get(Constants.NF_IRON).toString()
,map.get(Constants.NF_CALCIUM).toString()
,map.get(Constants.NF_SERVING_WEIGHT_GRAMS).toString()
);
}
}
else
{
Log.i(String.valueOf(position), String.valueOf(isChecked));
//buttonview.setChecked(false);
//buttonview.setText("Save");
ckboxTextAdd[position]="Add";
Log.i("value of text box false",ckboxTextAdd[position]);
// holder.ckbox.setText(ckboxTextAdd[position]);
// holder.ckbox.setText("Save");
// holder.ckbox.setBackgroundColor(Color.rgb(198, 228, 225));
checkedItems[position] = false;
//holder.ckbox.setText(ckboxTextAdd[position]);
db.deleteUnChecked(position);
}
}
});
}
return convertview;
}
private class Viewholder extends Activity
{
TextView title;
TextView servingsize;
//TextView status;
TextView carbs;
TextView proteins;
TextView calories;
ImageView img_serve_size;
TextView sodium;
TextView Fiber;
TextView carbs_val;
TextView proteins_val;
TextView calories_val;
TextView sodium_val;
TextView Fiber_val;
CheckBox ckbox;
TextView tvbrand;
TextView tvckboxText;
}
现在我想在列表视图中点击复选框的那一刻更新我的textview 但是直到现在它还没有按照预期的那样做，但是当我向下滚动并对已检查的项目进行检查时，textView就会更新
请提前帮助我
答案 0 :(得分：1)
<强>问题：
当您更新数组的值以映射已选中或未选中的状态时，您不会将TextView更新为CheckBox＆＃39; s选中或取消选中已实现api的开箱即用，但TextView的文字需要更新。
<强>解决方案：
您需要手动更新TextView的文字，或者只要在选中或取消选中该项时调用notifyDataSetChanged()，就会调用适配器的getView()并将强制根据更新的值刷新行。
<强>建议/改进：
你只能维护单个数组的布尔值，不需要维护String数组的添加或添加，同时显示文本，检查布尔值是否为真，将文本设置为＆＃34;添加＆＃34;，别的＆＃34;添加＆＃34;像这样：
holder.ckbox.setChecked(checkedItems[position]);
holder.tvckboxText.setText(checkedItems[position]?"Added":"Add");
不是实施匿名CompoundButton.OnCheckedChangeListener，而是将其实施到班级并设置为this，截至目前，您每次创建多个CompoundButton.OnCheckedChangeListener对象时滚动列表。
你在哪里关闭数据库？它并不是matter though，但它有一个关闭点的好处。
答案 1 :(得分：1)
istesd use
holder.ckbox.setText(checkedItems[position]?"Added","Add");
并删除
holder.tvckboxText.setText(ckboxTextAdd[position]?"Added","Add"););
这是因为它可能不支持横向视图