Question

我创建了以下适配器：

package org.virtualbet.gui.util;

import java.util.List;


import org.virtualbet.R;
import org.virtualbet.model.Tip;


import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class TipListAdapter extends ArrayAdapter<Tip> {
    private final Context context;
    private List<Tip> values;

    public TipListAdapter(Context context, int textViewResourceId, List<Tip> objects) {
        super(context, textViewResourceId, objects);
        //super(context, R.layout.rowlayout, values);
        this.context = context;
        this.values = objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        try {
            View v = convertView;
            if (v == null) {
                LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                v = inflater.inflate(R.layout.row_tip, null);
            }
            Tip tip = values.get(position);
            if (tip!=null) {
                ((TextView)v.findViewById(R.id.textviewtipid)).setText((CharSequence)tip.getTipNumber());
                ((TextView)v.findViewById(R.id.textviewtiprepresentation)).setText((CharSequence)tip.getTipRepresentation());
                ((TextView)v.findViewById(R.id.textviewtipresult)).setText((CharSequence)tip.getDetails());
                ((TextView)v.findViewById(R.id.textviewtipid)).setText((CharSequence)tip.getTipOptions());
                return v;
            }
            return null;
        } catch (Throwable t) {
            Log.e("A", t.toString());
            return null;
        }
    }


}

ListView xml如下所示：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content">
    <TextView android:text="TextView" 
    android:id="@+id/textviewtipid" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"
    >
    </TextView>
    <TextView android:text="TextView" 
    android:id="@+id/textviewtiprepresentation" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content">
    </TextView>
     <TextView android:text="TextView" 
    android:id="@+id/textviewtipresult" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content">
    </TextView>
    <TextView android:text="TextView" 
    android:id="@+id/textviewtipplayed" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content">
    </TextView>

</LinearLayout>

getView方法被调用...所有textviews都会改变它们的值...并且在最后一次更改后（无论是哪一个）程序进入catch部分???

为什么呢？有没有人有这样的问题？我读过某个项目（日食）问题....

哦，是的，我正在改变模特的地方是：

package org.virtualbet.gui;

import java.util.ArrayList;
import java.util.List;

import org.virtualbet.R;
import org.virtualbet.bll.TipBLL;
import org.virtualbet.gui.util.TipListAdapter;
import org.virtualbet.model.Ticket;
import org.virtualbet.model.Tip;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

public class FollowTicket extends Activity {

    private static final String TAG = "FollowTicket";

    private TipBLL bll;
    private TipListAdapter tipListAdapter;
    private ListView lv;
    private List<Tip> tips;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.follow_ticket);

        bll = new TipBLL();
        tips = new ArrayList<Tip>();
        tipListAdapter = new TipListAdapter(this.getApplicationContext(), R.layout.row_tip, tips);
        lv = ((ListView)findViewById(R.id.listViewTips));
        lv.setAdapter(tipListAdapter);
        ((Button)findViewById(R.id.buttonSearchForTicket)).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                searchTicket(((EditText)findViewById(R.id.editTextSerialNumber)).getText().toString());
            }
        });
    }

    private void searchTicket (String serialNumber) {
        Log.i(TAG, "Searching ticket " + serialNumber);
        Ticket ticket = bll.getTicket(serialNumber);
        if (ticket != null){
            Log.i(TAG, "Found it!");
            tips.clear();
            for (Tip tip : ticket.getTips()) {
                Log.i(TAG, "Adding tip " + tip.getTipNumber());
                tips.add(tip);
            }
            tipListAdapter.notifyDataSetChanged();
        } else {
            Log.i(TAG, "Didn't find it!");
        }
    }

}

Answer 1

固定它！真是个愚蠢的错误。在我的布局中，我拿着列表填充我有

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent" <-------------ERROR!!!!!!
    android:background="#880000"
    android:orientation="horizontal" >

.............一些元素

</LinearLayout>
<ListView
    android:id="@android:id/list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
</ListView>

哪里错误!!!指向它应该是wrap_content，因为这个布局将ListView推出范围，它不知道有ListView（在运行时，编译编译器不会抱怨）......真的很蠢!!! / p> 无论如何，谢谢你的帮助......

Answer 2

您可能希望在代码中再次查看此部分：

        if (tip!=null) {
            ((TextView)v.findViewById(R.id.textviewtipid)).setText((CharSequence)tip.getTipNumber());
            ((TextView)v.findViewById(R.id.textviewtiprepresentation)).setText((CharSequence)tip.getTipRepresentation());
            ((TextView)v.findViewById(R.id.textviewtipresult)).setText((CharSequence)tip.getDetails());
            ((TextView)v.findViewById(R.id.textviewtipid)).setText((CharSequence)tip.getTipOptions());
            return v;
        }

我认为你正在尝试两次R.id.textviewtipid。

        if (tip!=null) {
            ((TextView)v.findViewById(R.id.textviewtipid)).setText((CharSequence)tip.getTipNumber());
            ((TextView)v.findViewById(R.id.textviewtiprepresentation)).setText((CharSequence)tip.getTipRepresentation());
            ((TextView)v.findViewById(R.id.textviewtipresult)).setText((CharSequence)tip.getDetails());
            ((TextView)v.findViewById(R.id.textviewipplayed)).setText((CharSequence)tip.getTipOptions());
            return v;
        }

这可能是原因

Android ArrayAdapter不返回？

2 个答案: