根据值使用自定义适配器编辑列表视图中的项目
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【中文标题】根据值使用自定义适配器编辑列表视图中的项目【英文标题】：edit item in listview with custom adapter depending on value 【发布时间】：2015-10-31 04:48:17 【问题描述】：当我单击列表视图中的按钮时，我会调用一个函数，在该函数中我会根据单击的按钮清楚地发送一个值。当我得到项目字段更改值的积极响应功能时，首先是validado = 0，如果单击按钮更改为validado = 1。如果将此验证为 1，则该按钮应具有背景图像，以警告该项目已通过验证。所有这一切起初对我来说都很好，但是如果我单击任何按钮，无论我的列表中有多少项目，总是会更改它被单击的项目以及我列表中的第一个项目。当我的数据库在本地和服务器中时，第一项的验证值仍然是 0，这很有趣
我的适配器中的getView
@Override
public View getView(int position, View convertView, final ViewGroup parent)
ViewHolder holder = null;
RowItem rowItem = getItem(position);
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = mInflater.inflate(R.layout.lista_validacion_multiple, null);
holder = new ViewHolder();
holder.txtNombre = (TextView)convertView.findViewById(R.id.txtNombre);
holder.txtAsiento = (TextView)convertView.findViewById(R.id.txtAsiento);
holder.txtTicket = (TextView)convertView.findViewById(R.id.txtTicket);
holder.txtNumero = (TextView)convertView.findViewById(R.id.txtNumero);
holder.btn = (Button)convertView.findViewById(R.id.button1);
convertView.setTag(holder);
else
holder = (ViewHolder) convertView.getTag();
holder.txtNombre.setText("Nombre :"+rowItem.getNombre());
holder.txtTicket.setText("Ticket :"+rowItem.getTicket());
if (!rowItem.getAsiento().equals("") && !rowItem.getAsiento().equals("null") && rowItem.getAsiento() != null)
holder.txtAsiento.setText("Asiento :"+rowItem.getAsiento());
if (!rowItem.getNumero().equals("") && !rowItem.getNumero().equals("null") && rowItem.getNumero() != null)
holder.txtNumero.setText("Número :"+rowItem.getNumero());
System.out.println("item "+rowItem.getId_inscripcion()+" validado = "+rowItem.getValidado());
if(rowItem.getValidado()==1)
System.out.println("ENTRO");
holder.btn.setBackgroundResource(R.drawable.icon_big_alert);
holder.btn.setText("");
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams((int)LayoutParams.WRAP_CONTENT, (int)LayoutParams.WRAP_CONTENT);
params.width = 50;
params.height = 50;
params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
holder.btn.setLayoutParams(params);
else
holder.btn.setTag(position);
holder.btn.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
int position=(Integer)v.getTag();
RowItem item_click = getItem(position);
Connection cn = new Connection();
SessionManager manager = new SessionManager();
BaseDeDatos nueva = new BaseDeDatos();
JSONObject json = new JSONObject();
if(cn.isNetworkAvailable(parent.getContext()))
String nombreCliente = manager.getValue(parent.getContext(), "nombreCliente");
String user = manager.getValue(parent.getContext(), "nombreUser");
String folioEvento = manager.getValue(parent.getContext(), "folioEvento");
String codigoEvento = manager.getValue(parent.getContext(), "codigoEvento");
String seleccionValidadora = manager.getValue(parent.getContext(), "opcionVerificadora");
String nombreUser = manager.getValue(parent.getContext(), "nombreUser");
String hashUser = manager.getValue(parent.getContext(), "hashUsuario");
String URL_TICKET = Config.URL_BASE + nombreCliente
+ "/" + Config.URL_VALIDACION_TICKET
+ nombreUser + "/" + hashUser + "/"
+ folioEvento + "/" + item_click.getHash()
+ "/0/";
System.out.println(URL_TICKET);
if (manager.getValue(parent.getContext(),
"checkin") != null)
int id_checkin = nueva.idCheckin(parent.getContext(), manager.getValue(parent.getContext(),"checkin"));
String url = URL_TICKET + id_checkin;
HttpClient httpClient = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
post.setHeader("content-type",
"application/json");
try
// Construimos el objeto cliente en formato
// JSON
JSONObject dato = new JSONObject();
StringEntity entity = new StringEntity(
dato.toString());
post.setEntity(entity);
HttpResponse resp = httpClient
.execute(post);
String respStr = EntityUtils.toString(resp
.getEntity());
JSONObject respJSON = new JSONObject(
respStr);
json = respJSON;
catch (Exception ex)
Log.e("ServicioRest", "Error!", ex);
else
String url = URL_TICKET;
HttpClient httpClient = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
post.setHeader("content-type",
"application/json");
try
// Construimos el objeto cliente en formato
// JSON
JSONObject dato = new JSONObject();
StringEntity entity = new StringEntity(
dato.toString());
post.setEntity(entity);
HttpResponse resp = httpClient
.execute(post);
String respStr = EntityUtils.toString(resp
.getEntity());
JSONObject respJSON = new JSONObject(
respStr);
json = respJSON;
catch (Exception ex)
Log.e("ServicioRest", "Error!", ex);
System.out.println(json);
else
);
return convertView;
我显示日志显示该值仍为 0
08-07 13:39:21.890: I/System.out(14317): item 936 validado = 0
08-07 13:39:21.890: I/System.out(14317): item 937 validado = 0
08-07 13:39:21.890: I/System.out(14317): item 938 validado = 0
当你第一次进入listview的视图时退出，然后我将验证一个铭文，无论如何，这就是我得到的
08-07 13:44:08.300: I/System.out(14317): item 936 validado = 0
08-07 13:44:08.300: I/System.out(14317): item 937 validado = 1
08-07 13:44:08.305: I/System.out(14317): item 938 validado = 0
没关系，除了第一项加上验证图像的按钮的费用，我只想对rowItem.getValidado()==1中的元素收取费用
编辑
我回答了我的问题。
【问题讨论】：
I just want to be charged to the element that is in rowItem.getValidado()==1 是什么意思
表示只有当rowItem.getValidado() == 1 时改变按钮元素的背景图片。 @meda
【参考方案1】：
因此，您单击 ListView 上的 1 个项目，它会更改其外观（这是有意的），因为您的值更改为 1。但无论如何，ListView 中的第一个可见项目也会更改（无意） ?
我不是专家，但我猜您的ViewHolder 有问题。尝试删除 ViewHolder 逻辑，看看您是否仍然遇到问题（用于测试）。 ListView 很难回收视图并用新数据重新填充它们。你的getItem() 甚至可能有问题。但我怀疑这是ViewHolder 逻辑。
还需要在每次调用getView() 时声明Inflater 吗？ prob 应该将其移至构造函数并在getView() 中实例化它。
【讨论】：
没错，没有任何意图改变。如果我单击第一个或单击最后一个，您应该将其更改为单击而不是任何其他。 我发现错误代码本身很好并且可以工作，错误是代码正在执行的地方。【参考方案2】：错误是代码到哪里而不是如何。
@Override
public View getView(int position, View convertView, final ViewGroup parent)
ViewHolder holder = null;
RowItem rowItem = getItem(position);
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = mInflater.inflate(R.layout.lista_validacion_multiple, null);
holder = new ViewHolder();
holder.txtNombre = (TextView)convertView.findViewById(R.id.txtNombre);
holder.txtAsiento = (TextView)convertView.findViewById(R.id.txtAsiento);
holder.txtTicket = (TextView)convertView.findViewById(R.id.txtTicket);
holder.txtNumero = (TextView)convertView.findViewById(R.id.txtNumero);
holder.btn = (Button)convertView.findViewById(R.id.button1);
holder.txtNombre.setText("Nombre :"+rowItem.getNombre());
holder.txtTicket.setText("Ticket :"+rowItem.getTicket());
if (!rowItem.getAsiento().equals("") && !rowItem.getAsiento().equals("null") && rowItem.getAsiento() != null)
holder.txtAsiento.setText("Asiento :"+rowItem.getAsiento());
if (!rowItem.getNumero().equals("") && !rowItem.getNumero().equals("null") && rowItem.getNumero() != null)
holder.txtNumero.setText("Número :"+rowItem.getNumero());
System.out.println("item "+rowItem.getId_inscripcion()+" validado = "+rowItem.getValidado());
if(rowItem.getValidado()==1)
holder.btn.setBackgroundResource(R.drawable.icon_big_alert);
holder.btn.setText("");
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams((int)LayoutParams.WRAP_CONTENT, (int)LayoutParams.WRAP_CONTENT);
params.width = 50;
params.height = 50;
params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
holder.btn.setLayoutParams(params);
else
holder.btn.setTag(position);
holder.btn.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
int position=(Integer)v.getTag();
RowItem item_click = getItem(position);
Connection cn = new Connection();
SessionManager manager = new SessionManager();
BaseDeDatos nueva = new BaseDeDatos();
JSONObject json = new JSONObject();
if(cn.isNetworkAvailable(parent.getContext()))
String nombreCliente = manager.getValue(parent.getContext(), "nombreCliente");
String user = manager.getValue(parent.getContext(), "nombreUser");
String folioEvento = manager.getValue(parent.getContext(), "folioEvento");
String codigoEvento = manager.getValue(parent.getContext(), "codigoEvento");
String seleccionValidadora = manager.getValue(parent.getContext(), "opcionVerificadora");
String nombreUser = manager.getValue(parent.getContext(), "nombreUser");
String hashUser = manager.getValue(parent.getContext(), "hashUsuario");
String URL_TICKET = Config.URL_BASE + nombreCliente
+ "/" + Config.URL_VALIDACION_TICKET
+ nombreUser + "/" + hashUser + "/"
+ folioEvento + "/" + item_click.getHash()
+ "/0/";
System.out.println(URL_TICKET);
if (manager.getValue(parent.getContext(),
"checkin") != null)
int id_checkin = nueva.idCheckin(parent.getContext(), manager.getValue(parent.getContext(),"checkin"));
String url = URL_TICKET + id_checkin;
HttpClient httpClient = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
post.setHeader("content-type",
"application/json");
try
// Construimos el objeto cliente en formato
// JSON
JSONObject dato = new JSONObject();
StringEntity entity = new StringEntity(
dato.toString());
post.setEntity(entity);
HttpResponse resp = httpClient
.execute(post);
String respStr = EntityUtils.toString(resp
.getEntity());
JSONObject respJSON = new JSONObject(
respStr);
json = respJSON;
catch (Exception ex)
Log.e("ServicioRest", "Error!", ex);
else
String url = URL_TICKET;
HttpClient httpClient = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
post.setHeader("content-type",
"application/json");
try
// Construimos el objeto cliente en formato
// JSON
JSONObject dato = new JSONObject();
StringEntity entity = new StringEntity(
dato.toString());
post.setEntity(entity);
HttpResponse resp = httpClient
.execute(post);
String respStr = EntityUtils.toString(resp
.getEntity());
JSONObject respJSON = new JSONObject(
respStr);
json = respJSON;
catch (Exception ex)
Log.e("ServicioRest", "Error!", ex);
System.out.println(json);
else
);
convertView.setTag(holder);
else
holder = (ViewHolder) convertView.getTag();
return convertView;
【讨论】：
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