Android：Android 4.1仿真器从DatePicker对话框调用onDateSet两次 [英] Android: Android 4.1 Emulator Invoking onDateSet Twice from DatePicker Dialog

问题描述

我的应用程序在我的Android 2.2模拟器上工作得很好。然后我决定在Android 4.1模拟器上测试。 DatePickerDialog 看起来有点不同，出于某种原因，当我按完成时， onDateSet（） listener获取调用了两次，并在我的应用程序中引起问题。

我知道这一点，因为当我点击完成时，代码中显示的日志打印两次

  mDateSetListener = new DatePickerDialog.OnDateSetListener（）{
 @Override 
 public void onDateSet（DatePicker view，int year，int monthOfYear，int dayOfMonth）{
 Log.v（onDateSet，ENTERED）; 
 //其余的代码... 
}}; 
  

Android 2.2 DatePicker

Android 4.1 DatePicker

解决方案

尝试设置一个布尔值来检查同一对话框中的双击。类似于：

 日历c = Calendar.getInstance（）; 
 c.add（Calendar.DAY_OF_YEAR，1）; 
 final DatePickerDialog dateDialog = new DatePickerDialog（this，new DatePickerDialog.OnDateSetListener（）{
 boolean fired = false; 
 public void onDateSet（final DatePicker view，final int year，final int monthOfYear，final int dayOfMonth）{
 Log.i（PEW PEW，Double fire check）; 
 if（fired）{
 Log.i（PEW PEW，Double fire occur 。Silently-ish return）; 
 return; 
} else {
 // first time fired 
 fired = true; 
} 
 //正常日期选择逻辑在这里
} 
}，c.get（Calendar.YEAR），c.get（Calendar.MONTH），c.get（Calendar.DAY_OF_MONTH））; 
 dateDialog.show（）; 
  

这个双重火灾问题也发生在TimePickerDialog的onTimeSet上，此检查也适用于那些。 p>

My application was working perfectly on my Android 2.2 emulator. I then decided to test on an Android 4.1 emulator. The DatePickerDialog looks a little different and for some reason when I press on "Done", the onDateSet() listener gets called twice and causes problems in my application.

I know this because the log shown below in the code is printed twice whenever I click on "Done"

mDateSetListener = new DatePickerDialog.OnDateSetListener() {
    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
            Log.v("onDateSet", "ENTERED");
            //rest of code...
    }};

Android 2.2 DatePicker

Android 4.1 DatePicker

解决方案

Try setting a boolean to check for a double fire within the same dialog. Something similar to:

Calendar c = Calendar.getInstance();
c.add(Calendar.DAY_OF_YEAR, 1);
final DatePickerDialog dateDialog = new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {
    boolean fired = false;
    public void onDateSet(final DatePicker view, final int year, final int monthOfYear, final int dayOfMonth) {
        Log.i("PEW PEW", "Double fire check");
        if (fired) {
            Log.i("PEW PEW", "Double fire occured. Silently-ish returning");
            return;
        } else {
            //first time fired
            fired = true;
        }
        //Normal date picking logic goes here
    }
}, c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));
dateDialog.show();

This double fire issue also happens with onTimeSet of a TimePickerDialog and this check also works for those.

这篇关于Android：Android 4.1仿真器从DatePicker对话框调用onDateSet两次的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！