android listView 查看的信息改变颜色

 

 

最近给公司做了一个查看资讯的应用,参考别的应用,要加上(已读过的信息要用别的颜色进行区分)的需要.

下面是实现的部分代码:

 

 

 

继承自BaseAdapter

public View getView(int position, View convertView, ViewGroup parent) {

        // 利用ViewHolder来保存与convertView相关联的子View，避免调用 findViewById方法，以提高效率
        ViewHolder viewHolder = null;

        // 重复利用 convertView，convertView是旧的View，建议先判断是否为空，
        // 如果不为空，可以修改其内容来显示新的row
        if (convertView == null) {
            // Log.d("MyBaseAdapter", "新建convertView,position="+position);

            convertView = mInflater.inflate(myresource, null);
            viewHolder = new ViewHolder();
            viewHolder.txtViewTitle = (TextView) convertView
                    .findViewById(myto[0]);

            viewHolder.txtViewDateTime = (TextView) convertView
                    .findViewById(myto[1]);

            viewHolder.txtViewNewsId = (TextView) convertView
                    .findViewById(myto[2]);

            convertView.setTag(viewHolder);

        } else {
            viewHolder = (ViewHolder) convertView.getTag();
            // Log.d("MyBaseAdapter", "旧的convertView,position="+position);

        }

        Class cla = null;
        Field field = null;
        String value = null;
        TextView tv = null;
        Info info = (Info) mylist.get(position);
        boolean isRead = false;
        m_MyDataBaseAdapter.open();
        isRead = m_MyDataBaseAdapter.getIsRead(info.getNewsId());//用来判断该信息是否已读过
        m_MyDataBaseAdapter.close();
        
        cla = info.getClass();
        for (int i = 0; i < myfrom.length; i++) {

            try {
                field = cla.getDeclaredField(myfrom[i]);
                field.setAccessible(true);
            } catch (SecurityException e) {
                e.printStackTrace();
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            }
            try {
                value = (String) field.get(info);
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }

            tv = (TextView) convertView.findViewById(myto[i]);
            tv.setText(value);

            if (isRead == true && i == 0) {      //true 标明该信息已读过          
                tv.setTextColor(myContext.getResources().getColor(R.color.isRead));
            } else if (isRead == false && i == 0) {  //false 标明该信息未读过 
                //tv.setTextColor(myContext.getResources().getColor(R.color.isUnRead));
                tv.setTextColor(android.graphics.Color.BLACK);
            }
        }
        return convertView;
    }

从详细内容查看页返回时,要刷新ListView

    /**
     * 从其它activity返回时,刷新ListView
     */
    @Override
    protected void onRestart() {
        super.onRestart();
        myadapter.notifyDataSetChanged();//主要是为了刷新最后一次看信息的颜色
    }

 简单上个图:前两条是已经看过的,后两条是未看过的.