Question

我有以下情况：

一项从互联网咨询价值并填写以下对象的活动：

public class LPBean {

private Lin lin;
private Posted posted;
public Lin getLin() {
    return lin;
}
public void setLin(Lin lin) {
    this.lin = lin;
}
public Posted getPosted() {
    return posted;
}
public void setEstimativa(Posted p) {
    this.posted = p;
}
}

我的活动从互联网填充LPBean中的lin信息，并将对象传递给CustomAdapter

但是来自LPBean的发布值填充了来自互联网的信息，搜索键是lin.id（表单LPBean），所以这样做，我正在使用AsynkTask。

因此，listView向用户显示，并且在打开listView的情况下动态显示发布的值（来自LpBean）。

为此，我做如下：

public class ListaLinsAdapter extends BaseAdapter {
    private Context context;
    private List<LinPostedBean> lins;
    private LayoutInflater inflater;
    private ViewHolder holder;
    private String idLin;

public ListaLinsAdapter(Context context, List<LinPostedBean> listaLins) {
    this.context = context;
    this.lins = listaLins;
    this.inflater = LayoutInflater.from(context);
}

@Override
public int getCount() {
    return lins.size();
}

@Override
public Object getItem(int position) {
    return lins.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View view, ViewGroup parent) {
    // Recupera o estado da posição atual
    LinPostedBean lpBean = lins.get(position);
    Lin lin = lpBean.getLin();
do somthing.....

并在来自适配器的getView方法的末尾，验证是否具有发布属性的值以显示信息

        if((lpBean.getPosted() != null) && (lpBean.getPosted().getPonto() != null))
    {
        if(lpBean.getPosted().getPonto().size() > 0)
            holder.fillPosted(lpBean.getPosted());
        else
            holder.showMsg(context.getResources().getString(R.string.msgEmptyPosted));
    }


    return view;
}

在我的活动中，我已经实现了AsyncTask内部类，如下所示：

private class ConsultaPostedBackGround extends AsyncTask<Object, Void, Object[]> {

    @Override
    protected Object[] doInBackground(Object... objs) {
            try {
                LinPostedBean lpBean = (LinPostedBean)objs[0];
                Context context = (Context)objs[3];
                String linId = lpBean.getLin().getLin();
                int indice = linId.indexOf("-");
                linId = linId.substring(0,indice).trim();
//GET INFORMATION FROM INTERNET
                PostedUtil pUtil = new PostedUtil(pontoId.trim(), linId,
                        context);

//PUT INTERNET RESULT IN Posted ATTRUBUTE IN ADAPTER
                Integer position = (Integer)objs[1];
                ((LinPostedBean)((ListaLinsAdapter)objs[2]).getItem(position)).setEstimativa(pUtil.getPosted());

            } catch (Exception e) {
                objs[3] = null;
            }
        return objs;
    }

    @Override
    protected void onPostExecute(Object[] result) {
//REFRESH LISTVIEW
        if(result[3] != null)
            ((ListaLinsAdapter)result[2]).notifyDataSetChanged();
    }

在活动中，我将每次调用AsyncTask一次，如下所示：

ListView lista = (ListView) findViewById(R.id.listView);
    lista.setAdapter(listaLinsAdapter);
    lista.setOnItemClickListener(this);

    int cont = 0;
    for (LinPostedBean lpBean : listaLPBean) {
        Object[] params = new Object[4];
        params[0] = lpBean;
        params[1] = new Integer(cont);
        params[2] = listaLinsAdapter;
        params[3] = this;
//CALL TO AsyncTask
        new ConsultaPrevisaoBackGround().execute(params);
        cont++;
    }

我认为这种策略是正确的，但不起作用。发布的值不是在listview中显示。

有什么问题？

已更新

我的班级适配器：

public class ListaLinsAdapter extends BaseAdapter {
private Context context;
private List<LinPostedBean> lins;
private LayoutInflater inflater;
private ViewHolder holder;
private String idLin;

public ListaLinsAdapter(Context context, List<LinPostedBean> listaLins) {
    this.context = context;
    this.lins = listaLins;
    this.inflater = LayoutInflater.from(context);
}

@Override
public int getCount() {
    return lins.size();
}

@Override
public Object getItem(int position) {
    return lins.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View view, ViewGroup parent) {
    // Recupera o estado da posição atual
    LinPostedBean lpBean = lins.get(position);
    Lin lin = lpBean.getLin();

    if (view == null) {
        view = inflater.inflate(R.layout.listadadoslins, null);
        holder = new ViewHolder(context);
        // Número da lin
        holder.txtIdLin = (TextView) view.findViewById(R.id.txtIdLin);
        // Nome da lin
        holder.txtNomeLin = (TextView) view
                .findViewById(R.id.txtNomeLin);

        // Seta campo de informação sem parada
        holder.txtMsgSemParada = (TextView) view
                .findViewById(R.id.msgSemParada);

        // seta layouts de previsão
        holder.llLin1 = (LinearLayout) view
                .findViewById(R.id.linearPrevisoes1);
        holder.llLin2 = (LinearLayout) view
                .findViewById(R.id.linearPrevisoes2);
        holder.llLin3 = (LinearLayout) view
                .findViewById(R.id.linearPrevisoes3);

        // Seta campos de previsão
        holder.txtPrev1 = (TextView) view.findViewById(R.id.txtPrev1);
        holder.txtPrev2 = (TextView) view.findViewById(R.id.txtPrev2);
        holder.txtPrev3 = (TextView) view.findViewById(R.id.txtPrev3);
        holder.txtPrev4 = (TextView) view.findViewById(R.id.txtPrev4);
        holder.txtPrev5 = (TextView) view.findViewById(R.id.txtPrev5);
        holder.txtPrev6 = (TextView) view.findViewById(R.id.txtPrev5);

        view.setTag(holder);
    } else {
        holder = (ViewHolder) view.getTag();
        holder.reset();
    }

    String lin = lin.getLin().trim();
    StringTokenizer stk = new StringTokenizer(lin, "-");

    // Número da lin
    idLin = stk.nextToken();
    holder.txtIdLin.setText(idLin);

    // Nome da lin
    holder.txtNomeLin.setText(stk.nextToken());

    //new ConsultaPostedBackGround().execute("");
    if((lpBean.getPosted() != null) && (lpBean.getPosted().getPonto() != null))
    {
        if(lpBean.getPosted().getPonto().size() > 0)
            holder.fillPosted(lpBean.getPosted());
        else
            holder.showMsg(context.getResources().getString(R.string.msgSemPosted));
    }


    return view;
}

static class ViewHolder {
    Context context;
    TextView txtIdLin;
    TextView txtNomeLin;
    TextView txtMsgSemParada;

    LinearLayout llLin1;
    LinearLayout llLin2;
    LinearLayout llLin3;

    TextView txtPrev1;
    TextView txtPrev2;
    TextView txtPrev3;
    TextView txtPrev4;
    TextView txtPrev5;
    TextView txtPrev6;

    public ViewHolder(Context cont) {
        this.context = cont;
    }

    public void reset() {
        txtIdLin.setText(null);
        txtNomeLin.setText(null);
        limpaPrevisoes();
    }

    private void limpaPrevisoes() {
        llLin1.setVisibility(View.GONE);
        llLin2.setVisibility(View.GONE);
        llLin3.setVisibility(View.GONE);
        txtMsgSemParada.setVisibility(View.GONE);

        txtPrev1.setText(null);
        txtPrev2.setText(null);
        txtPrev3.setText(null);
        txtPrev4.setText(null);
        txtPrev5.setText(null);
        txtPrev6.setText(null);
    }

    public void showError() {
        showMsg(context.getResources().getString(R.string.msgErroPosted));
    }

    public void showMsg(String msg) {
        limpaPrevisoes();
        txtMsgSemParada.setText(msg);
    }

    public void fillPosted(Posted p) {
        Collections.sort(p.getPonto());

        if (p.getPonto().size() > 6) {
            for (int i = 6; i < p.getPonto().size(); i++)
                p.getPonto().remove(i);
        }

        int cont = 1;
        for (Estimativa estimativa : p.getPonto()) {
            setPosted(cont, estimativa, p);
            cont++;
        }

        if (p.getPonto().size() <= 2) {
            llLin2.setVisibility(View.GONE);
            llLin3.setVisibility(View.GONE);
        }

        if ((p.getPonto().size() > 2) && (p.getPonto().size() <= 4))
            llLin3.setVisibility(View.GONE);

    }

    // Preenche o campo referente à estimativa
    private void setPosted(int id, Estimativa estimativa,
            Posted posted) {

        switch (id) {
        case 1:
            txtPrev1.setText(getgetPostedFormatedPosted(posted, estimativa));
            setBackGroundColor(estimativa, txtPrev1);
            break;
        case 2:
            txtPrev2.setText(getgetPostedFormatedPosted(posted, estimativa));
            setBackGroundColor(estimativa, txtPrev2);
            break;
        case 3:
            txtPrev3.setText(getgetPostedFormatedPosted(posted, estimativa));
            setBackGroundColor(estimativa, txtPrev3);
            break;
        case 4:
            txtPrev4.setText(getgetPostedFormatedPosted(posted, estimativa));
            setBackGroundColor(estimativa, txtPrev4);
            break;
        case 5:
            txtPrev5.setText(getgetPostedFormatedPosted(posted, estimativa));
            setBackGroundColor(estimativa, txtPrev5);
            break;
        case 6:
            txtPrev6.setText(getgetPostedFormatedPosted(posted, estimativa));
            setBackGroundColor(estimativa, txtPrev6);
            break;
        default:
            break;
        }

    }

    private String getgetPostedFormatedPosted(Posted posted,
            Estimativa estimativa) {
        String hourStr;
        String minutoStr;
        long hourAtual = Long.parseLong(posted.getHorarioAtual());
        long seconds = (estimativa.getHorarioPacote() - hourAtual) / 1000;
        int week = (int) Math.floor(seconds / 604800);
        seconds -= week * 604800;
        int dias = (int) Math.floor(seconds / 86400);
        seconds -= dias * 86400;
        int hours = (int) Math.floor(seconds / 3600);
        seconds -= hours * 3600;
        int minutes = (int) Math.floor(seconds / 60);
        seconds -= minutes * 60;

        minutes += 1;

        if (hours < 10)
            hourStr = "0" + hours;
        else
            hourStr = String.valueOf(hours);

        if (minutes < 10)
            minutoStr = "0" + minutes;
        else
            minutoStr = String.valueOf(minutes);

        String tempo;
        if (hours > 0)
            tempo = hourStr + "h " + minutoStr + "min";
        else
            tempo = minutoStr + "min";

        SimpleDateFormat spf = new SimpleDateFormat("HH:mm:ss");
        tempo = tempo + " às "
                + spf.format(estimativa.getHorarioEstimado());
        return tempo;
    }

    private void setBackGroundColor(Estimativa estimativa, TextView txtView) {
        // Imagem a ser exibida
        switch (estimativa.getStatus()) {
        case 0:
            txtView.setBackgroundColor(context.getResources().getColor(
                    R.color.postedVerde));
            break;
        case 1:
            txtView.setBackgroundColor(context.getResources().getColor(
                    R.color.postedLaranja));
            break;
        case 2:
            txtView.setBackgroundColor(context.getResources().getColor(
                    R.color.postedVermelha));
            break;
        default:
            break;
        }
    }
}
}

我在listView中的项目的xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/txtIdLinha"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:paddingLeft="6dp"
        android:paddingRight="4dp"
        android:paddingTop="4dp"
        android:text="184"
        android:textColor="@color/blue_nightsky"
        android:textSize="20sp"
        android:textStyle="bold" />

    <LinearLayout
        android:id="@+id/llPrevisoes"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <LinearLayout
            android:id="@+id/linearTit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/txtNomeLinha"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:paddingRight="7dp"
                android:text="FFFFFF"
                android:textColor="@drawable/dialog_itemtextlist_selector"
                android:textStyle="bold" >
            </TextView>

            <TextView
                android:id="@+id/msgSemParada"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:paddingRight="7dp"
                android:text="@string/msgSemPrevisao"
                android:textColor="@drawable/dialog_itemtextlist_selector"
                android:textSize="12sp"
                android:textStyle="bold"
                android:visibility="gone" >
            </TextView>
        </LinearLayout>

        <LinearLayout
            android:id="@+id/linearPrevisoes1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="2dp">

            <TextView
                android:id="@+id/txtPrev1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="2dp"
                android:layout_marginRight="2dp"
                android:paddingLeft="2dp"
                android:paddingRight="2dp"
                android:text=""
                android:textColor="@color/white"
                android:textSize="12dp" >
            </TextView>

            <TextView
                android:id="@+id/txtPrev2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="2dp"
                android:layout_marginRight="2dp"
                android:paddingLeft="2dp"
                android:paddingRight="2dp"
                android:text=""
                android:textColor="@color/white"
                android:textSize="12dp" >
            </TextView>

        </LinearLayout>

        <LinearLayout
            android:id="@+id/linearPrevisoes2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="2dp" >

            <TextView
                android:id="@+id/txtPrev3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="2dp"
                android:layout_marginRight="2dp"
                android:paddingLeft="2dp"
                android:paddingRight="2dp"
                android:text=""
                android:textColor="@color/white"
                android:textSize="12dp" >
            </TextView>

            <TextView
                android:id="@+id/txtPrev4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="2dp"
                android:layout_marginRight="2dp"
                android:paddingLeft="2dp"
                android:paddingRight="2dp"
                android:text=""
                android:textColor="@color/white"
                android:textSize="12dp" >
            </TextView>


        </LinearLayout>

        <LinearLayout
            android:id="@+id/linearPrevisoes3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="2dp">

            <TextView
                android:id="@+id/txtPrev5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="2dp"
                android:layout_marginRight="2dp"
                android:paddingLeft="2dp"
                android:paddingRight="2dp"
                android:text=""
                android:textColor="@color/white"
                android:textSize="12dp" >
            </TextView>

            <TextView
                android:id="@+id/txtPrev6"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="2dp"
                android:layout_marginRight="2dp"
                android:paddingLeft="2dp"
                android:paddingRight="2dp"
                android:text=""
                android:textColor="@color/white"
                android:textSize="12dp" >
            </TextView>

        </LinearLayout>
    </LinearLayout>

</LinearLayout>

已更新

解决了，问题出在我的适配器上。

Answer 1

尝试将以下内容添加到ListaLinsAdapter。

public void add(LinPostedBean lpb){
    lins.add(lpb);
    notifyDataSetChanged();
}

然后在doInBackground中调用它，在这种情况下您不需要使用onPostExecute。

使用AsyncTask更新ListView项目

1 个答案: