我正在使用带有customAdapter的listView，customAdapter有1个图像，3个文本，图像是从互联网下载的（带有asyn类），下载完成后，它将图像放入setImageBitmap（）。
问题是，如果我不移动listView，图像就不会刷新。
我的意思是当我移动列表并且它丢失了第一个元素的视图时，一切都很完美但是如果你不移动列表视图它就不起作用
我认为问题不在于自定义适配器，因为我尝试了懒惰的下载图像方式并出现同样的问题
我也尝试使用invalidate()并且仍然存在相同的错误
有我的代码
我称之为适配器
public class Chat extends Activity {
DBHelper bd;
Context ctx;
List<Conversacion> lista = new ArrayList<Conversacion>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Quitamos la barra de título de nuestra aplicación
requestWindowFeature(Window.FEATURE_NO_TITLE);
//Quitamos la barra de android donde muestra la cobertura, batería, etc..
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.chat);
ctx = this;
bd = new DBHelper(ctx);
bd.open();
Intent i = new Intent(this, Chat_sala.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtra("id", "302");
i.putExtra("nombre", "Elenea");
i.putExtra("url", "302");
// startActivity(i);
//insertarDatos();
rellenarLista();
rellenarAdapter();
}
public void rellenarLista()
{
GrupoChat[] array = bd.recuperarGrupoS();
Conversacion nueva;
for (GrupoChat grupo : array)
{
nueva = new Conversacion(grupo.getId(),"http://apps.sexurus.com:81/php/prueba/"+grupo.getId()+".jpg",grupo.getNombre(),grupo.getUltimo(),devolverFechaMostrar(grupo.getHora()));
lista.add(nueva);
}
}
public void rellenarAdapter()
{
ChatAdapter adapter = new ChatAdapter(this,lista);
ListAdapterChat chat = new ListAdapterChat(this,lista);
LazyAdapter chat2 = new LazyAdapter(this,lista);
final ListView mylistview = (ListView) findViewById(R.id.listView1);
mylistview.setAdapter(adapter);
}
public String devolverFechaMostrar(String fecha)
{
String fechaActual = getDatePhone();
String[] dia = fecha.split(" ");
String[] diaActual = fechaActual.split(" ");
if(dia[0].equalsIgnoreCase(diaActual[0]))
{
return dia[1];
}
else
{
return fecha;
}
}
private String getDatePhone()
{
Calendar cal = new GregorianCalendar();
Date date = cal.getTime();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String formatteDate = df.format(date);
return formatteDate;
}
Adapter
public class ChatAdapter extends BaseAdapter {
private Context context;
private List<Conversacion> videos;
ImageView[] ivImage;
View[] prueba;
TextView[] tvName;
TextView[] tvHora;
TextView[] tvUltimo;
Bitmap[] imagenes;
FetchBitmapTask descargador[];
public ChatAdapter (Context context, List videos) {
this.context = context;
this.videos = videos;
//layoutInflater = LayoutInflater.from(context);
ivImage = new ImageView[(videos.size())];
tvName = new TextView[(videos.size())];
tvHora = new TextView[(videos.size())];
tvUltimo = new TextView[(videos.size())];
imagenes = new Bitmap[videos.size()];
descargador = new FetchBitmapTask[videos.size()];
prueba = new View[videos.size()];
}
@Override
public int getCount() {
return videos.size();
}
@Override
public Object getItem(int position) {
return videos.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.adapter_conversacion, parent, false);
( this.videos.get(position)).getHora();
ivImage[position] = (ImageView)itemView.findViewById(R.id.imagen);
tvName[position] = (TextView)itemView.findViewById(R.id.nombre);
tvHora[position] = (TextView)itemView.findViewById(R.id.hora);
tvUltimo[position] = (TextView)itemView.findViewById(R.id.ultimo);
tvName[position].setText(( this.videos.get(position)).getNombre());
tvHora[position].setText(( this.videos.get(position)).getHora());
tvUltimo[position].setText(( this.videos.get(position)).getUltimo());
if(imagenes[position] != null)
{
ivImage[position].setImageBitmap(imagenes[position]);
}
else
{
if(descargador[position]==null)
{
String url = (( this.videos.get(position)).getUrl());
descargador[position] = new FetchBitmapTask(context, new FetchBitmapTaskCompleteListener(), url, position);
descargador[position].execute();
}
}
final String id=( this.videos.get(position)).getId();
final String nombre=(( this.videos.get(position)).getNombre());
final String url = (( this.videos.get(position)).getUrl());
itemView.setOnClickListener(new OnClickListener() {
@Override public void onClick(View v)
{
irAFicha(id,nombre,url);
}
});
//ivImage[position].setImageResource(R.drawable.ic_launcher);
prueba[position] = itemView;
return itemView;
}
public void irAFicha(String temp,String nombre,String url)
{
Intent i = new Intent(context, Chat_sala.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtra("id", temp);
i.putExtra("nombre", nombre);
i.putExtra("url", url);
context.startActivity(i);
}
public class FetchBitmapTaskCompleteListener implements AsyncTaskTwoValuesCompleteListener<Bitmap, String>
{
@Override
public void onTaskComplete(Bitmap result, String str_devuelto)
{
int ind = Integer.parseInt(str_devuelto);
imagenes[ind] = result;
ivImage[ind].setImageBitmap(imagenes[ind]);
ivImage[ind].setImageResource(R.drawable.ic_launcher);
tvName[ind].setText("mis cojones");
tvHora[ind].setText("erer");
tvUltimo[ind].setText("erersdsr");
/*ivImage[ind].invalidate();
ivImage[ind].postInvalidate();
ivImage[ind].refreshDrawableState();
prueba[ind].invalidate();*/
String a = tvName[ind].getText().toString();
int er = 5;
}
}
}
}
答案 0 :(得分：2)
您应该在onTaskComplete函数中调用notifyDataSetChanged（），例如：
....
int er = 5;
ChatAdapter.this.notifyDataSetChanged();
通过这样做，listview将使用最新数据更新其子视图。
希望这会有所帮助......