问题描述

ListView列表文字无故变灰

我参考了官方的代码listview Adapter用法，但是移植过来listview文字就变成灰了，并且能选中 下面贴出代码。已经DEBUG 子线程返回data没问题。
这是运行图片。

 package com.wastrel.activity;

import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;

import com.wastrel.provider.Tabletbl;
import com.wastrel.provider.TabletblDAO;
import com.wastrel.util.HttpUtil;

import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class ChaZhuoActivity extends ListActivity {

    private Handler myhander = null;
    // private ListView tablelist = null;
    // private TextView tableid = null;

    private List<Tabletbl> data = new ArrayList<Tabletbl>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO 自动生成的方法存根
        super.onCreate(savedInstanceState);
        // setContentView(R.layout.activity_chazhuo);
        // tablelist = (ListView) findViewById(R.id.tablelist);
        // tableid = (TextView) findViewById(R.id.tablenum);
        myhander = new Handler() {

            @SuppressWarnings("unchecked")
            @Override
            public void handleMessage(Message msg) {
                // TODO 自动生成的方法存根
                switch (msg.what) {
                case 1:
                    data = (List<Tabletbl>) msg.obj;
                    TableListAdapter tblAdapter = new TableListAdapter(data,
                            getApplicationContext());
                    setListAdapter(tblAdapter);
                    break;

                default:
                    break;
                }
            }

        };
        new Thread(updatetable).start();
    }

    Runnable updatetable = new Runnable() {

        @Override
        public void run() {
            // TODO 自动生成的方法存根
            String urlStr = HttpUtil.Base_URL + "servlet/UpdateTableServlet";
            try {
                // 实例化URL对象
                URL url = new URL(urlStr);
                // 打开连接
                URLConnection conn = url.openConnection();
                // 获得输入流
                InputStream in = conn.getInputStream();
                // 实例化DocumentBuilderFactory
                DocumentBuilderFactory factory = DocumentBuilderFactory
                        .newInstance();
                // 实例化DocumentBuilder
                DocumentBuilder builder = factory.newDocumentBuilder();
                // 获得Document
                Document doc = builder.parse(in);
                // 获得节点列表
                NodeList nl = doc.getElementsByTagName("table");
                TabletblDAO tabletblDAO = new TabletblDAO(
                        getApplicationContext());
                if (nl.getLength() > 0) {
                    tabletblDAO.DeleteData();
                }
                // 循环将数据保存到菜谱表
                List<Tabletbl> list = new ArrayList<Tabletbl>();
                for (int i = 0; i < nl.getLength(); i++) {
                    // 实例化ContentValues
                    // 解析XML文件获得桌号id
                    int id = Integer.parseInt(doc.getElementsByTagName("id")
                            .item(i).getFirstChild().getNodeValue());
                    int num = Integer.parseInt(doc.getElementsByTagName("num")
                            .item(i).getFirstChild().getNodeValue());
                    // 名称
                    String name = doc.getElementsByTagName("name").item(i)
                            .getFirstChild().getNodeValue();
                    int flag = Integer.parseInt(doc
                            .getElementsByTagName("flag").item(i)
                            .getFirstChild().getNodeValue());
                    String description = doc
                            .getElementsByTagName("description").item(i)
                            .getFirstChild().getNodeValue();
                    /*
                     * values.put("id", id); values.put("num", num);
                     * values.put("name", name); values.put("flag", flag);
                     * values.put("description", description);
                     */
                    list.add(new Tabletbl(id, num, name, flag, description));
                    // 添加到ContenValues对象
                    // 插入到数据库
                    // tabletblDAO.AddTabletblDAO(values);
                }
                Message msg = myhander.obtainMessage();
                msg.what = 1;
                msg.obj = list;
                myhander.sendMessage(msg);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }

    };

    private static class TableListAdapter extends BaseAdapter {

        public List<Tabletbl> mlist = null;
        private Context context;

        public TableListAdapter(List<Tabletbl> list, Context c) {
            mlist = list;
            context = c;
        }

        @Override
        public int getCount() {
            // TODO 自动生成的方法存根
            return mlist.size();
        }

        @Override
        public Object getItem(int position) {
            // TODO 自动生成的方法存根
            return position;
        }

        @Override
        public long getItemId(int position) {
            // TODO 自动生成的方法存根
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO 自动生成的方法存根
            ViewHolder holder;

            // When convertView is not null, we can reuse it directly, there is
            // no
            // need
            // to reinflate it. We only inflate a new View when the convertView
            // supplied
            // by ListView is null.
            if (convertView == null) {
                LayoutInflater mInflater = LayoutInflater.from(context);

                convertView = mInflater.inflate(R.layout.chazhuo_list, null);

                // Creates a ViewHolder and store references to the two children
                // views
                // we want to bind data to.
                holder = new ViewHolder();
                holder.idtext = (TextView) convertView
                        .findViewById(R.id.chazhuo_id);
                holder.nametext = (TextView) convertView
                        .findViewById(R.id.chazhuo_name);
                holder.flagtext = (TextView) convertView
                        .findViewById(R.id.chazhuo_flag);
                holder.remarktext = (TextView) convertView
                        .findViewById(R.id.chazhuo_remark);
                convertView.setTag(holder);
            } else {
                // Get the ViewHolder back to get fast access to the TextView
                // and the ImageView.
                holder = (ViewHolder) convertView.getTag();
            }

            // Bind the data efficiently with the holder.
            holder.idtext.setText(String.valueOf(mlist.get(position).getId()));
            holder.nametext.setText(mlist.get(position).getName());
            if (mlist.get(position).getFlag() == 0)
                holder.flagtext.setText(context
                        .getString(R.string.chazhuo_kongxian));
            else if (mlist.get(position).getFlag() == 1) {
                holder.flagtext.setText(context
                        .getString(R.string.chazhuo_youren));
            } else {
                holder.flagtext.setText(context
                        .getString(R.string.chazhuo_unkown));
            }
            holder.remarktext.setText(mlist.get(position).getDescription());
            return convertView;
        }

        static class ViewHolder {
            TextView idtext;
            TextView nametext;
            TextView flagtext;
            TextView remarktext;
        }
    }

}

这段XML 我在官方的demo上试了 没问题。

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:padding="5dp" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
 />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="0dp"
                android:layout_weight="2"
        android:layout_height="wrap_content"
 />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
 />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="0dp"
        android:layout_weight="2"
        android:layout_height="wrap_content"
 />

</LinearLayout>

这个问题我搞了一两天了 找不到哪里的问题。求大神解决。

解决方案

onCreate 时，case 1时：
TableListAdapter tblAdapter = new TableListAdapter(data, getApplicationContext());
里面的 getApplicationContext()
改成 ChaZhuoActivity.this
试试

解决方案二：

看你AndroidManifest.xml文件中是不是你按照创建工程向导默认设置了全局样式。导致字体是灰色。

解决方案三：

R.layout.chazhuo_list这个自定义布局里面看看是不是设置字体颜色了

解决方案四：

应该是你工程设置了style的Theme，你看看呢

解决方案五：

自己用baseadapter吧 可控性高