java - 获取当前日期之前的日期更改 TextView 颜色

Question

大家好，我在 ListView 中添加了 3 列 Sqlite 数据库。如果给定的日期早于当前日期，我正在尝试将员工出生日期 (empDobTxt) 的 TextView 颜色更改为红色。

我正在关注this tutorial 。

   public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder = null;
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.list_item, null);
        holder = new ViewHolder();

        holder.empIdTxt = (TextView) convertView
                .findViewById(R.id.txt_emp_id);
        holder.empNameTxt = (TextView) convertView
                .findViewById(R.id.txt_emp_name);
        holder.empDobTxt = (TextView) convertView
                .findViewById(R.id.txt_emp_dob);
        holder.empSalaryTxt = (TextView) convertView
                .findViewById(R.id.txt_emp_salary);

        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    Employee employee = (Employee) getItem(position);
    holder.empIdTxt.setText(employee.getId() + "");
    holder.empNameTxt.setText(employee.getName());
    holder.empSalaryTxt.setText(employee.getSalary() + "");
    holder.empDobTxt.setText(formatter.format(employee.getDateOfBirth()));

    String dtStart = empDobTxt.getText().toString(); 
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH);
    String currentDateandTime = sdf.format(new Date());
    try {  
        Date date = sdf.parse(dtStart);
        Date date1 = sdf.parse(currentDateandTime);
        if(date.before(date1));
        {
            empDobTxt.setTextColor(Color.RED);
        }  
    } catch (ParseException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
    }

    return convertView;

}

这是logCat:

 02-17 11:33:00.486: E/AndroidRuntime(7308):        java.lang.NullPointerException
 02-17 11:33:00.486: E/AndroidRuntime(7308):    at  com.androidopentutorials.sqlite.adapter.EmpListAdapter.getView(EmpListAdapter.java:88)

Answer 1

试试这个。

String dtStart = empDobTxt.getText().toString(); 
try {  

    Calendar calDtStart = Calendar.getInstance();
    SimpleDateFormat sdf = new SimpleDateFormat("EEE MMM dd HH:mm:ss z yyyy", Locale.EN_US);
    calDtStart.setTime(dtStart);

    Calendar nowDate = Calendar.getInstance();
    if(calDtStart.before(nowDate));
    {
        holder.empDobTxt.setTextColor(Color.RED);
    }  
} catch (ParseException e) {  
    // TODO Auto-generated catch block  
    e.printStackTrace();  
}