减去两个时间字符串

我有两个名为clockedin和clockedout的字符串变量。我把它们放在共享首选项中，现在我试图调用它们并将它们转换为整数，这样我就可以在时钟的时间内减去超时的时间以查看工作了多少个小时。减去两个时间字符串

public void onCheckedChanged(CompoundButton compoundButton, boolean b){ 
    if(b){ 
     Calendar c = Calendar.getInstance(); 
     System.out.println(c.getTime()); 
     SimpleDateFormat df = new SimpleDateFormat("hh:mm a"); 
     String formattedDate = df.format(c.getTime()); 
     TextView clockedin = (TextView)findViewById(R.id.clockedin); 
     clockedin.setText(formattedDate); 






     SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); 
     SharedPreferences.Editor editor = sharedPreferences.edit(); 
     editor.putBoolean("toggleButton", tb.isChecked()); 
     editor.commit(); 

     SharedPreferences sharedPreferences2=getSharedPreferences("MyData", Context.MODE_PRIVATE); 
     SharedPreferences.Editor editor1= sharedPreferences2.edit(); 
     editor1.putString("clockedin", formattedDate); 
     editor1.commit(); 
    } 
    else { 
     Calendar c = Calendar.getInstance(); 
     System.out.println(c.getTime()); 
     SimpleDateFormat df = new SimpleDateFormat("hh:mm a"); 
     String formattedDate = df.format(c.getTime()); 
     TextView clockedout = (TextView)findViewById(R.id.clockedout); 
     clockedout.setText(formattedDate); 

     SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); 
     SharedPreferences.Editor editor = sharedPreferences.edit(); 
     editor.putBoolean("toggleButton", false); 
     editor.commit(); 

     SharedPreferences sharedPreferences2=getSharedPreferences("MyData2", Context.MODE_PRIVATE); 
     SharedPreferences.Editor editor1= sharedPreferences2.edit(); 
     editor1.putString("clockedout", clockedout.getText().toString()); 
     editor1.commit(); 

     SharedPreferences sharedPreferences1 = getSharedPreferences("MyData", Context.MODE_PRIVATE); 
     String clockedin =sharedPreferences1.getString("clockedin", DEFAULT); 


}}

我的转换方法：

public void onClickButtonListener2(){ 
Button button2; 
button2 = (Button) findViewById(R.id.calctotal); 
button2.setOnClickListener(
     new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Date date = null; 
       Date date2 = null; 


       SharedPreferences sharedPreferences1 = getSharedPreferences("MyData", Context.MODE_PRIVATE); 
       String clockedin =sharedPreferences1.getString("clockedin", DEFAULT); 

       SharedPreferences sharedPreferences2 = getSharedPreferences("MyData2", Context.MODE_PRIVATE); 
       String clockedout =sharedPreferences2.getString("clockedout",DEFAULT); 

       DateFormat outFormat = new SimpleDateFormat("hh:mm"); 
       try { 
        date = outFormat.parse(String.valueOf(clockedout)); 
        date2 = outFormat.parse(clockedin); 
       }catch (ParseException e){ 
        e.printStackTrace(); 
       } 
       if (date2.before(date)){ 
        long diffMs = date.getTime() - date2.getTime(); 
        long diffSec = diffMs/1000; 
        long min = diffSec/60; 
        double hour = (double)min/60; 
        double hourA = Math.round(hour *100.0)/100.0; 
        TextView totalhours=(TextView)findViewById(R.id.totalhours); 
        totalhours.setText((int) hourA); 

       } 

      } 
     }); 
     }

我的日志attatched enter image description here

来源

2016-03-08 user4792835

你刚才不是问这个约5小时前？ – ctst

是的，但现在我有日志 – user4792835

totalhours.setText（（int）的hourA）;

应该是：totalhours.setText（String.valueOf（hourA））; 或 totalhours.setText（“”+ hourA）;

如果您使用整数调用setText，它将查找具有该ID的字符串资源。

来源

2016-03-08 18:20:48 mukeshshenoy

谢谢。但现在我有另一个问题。由于某些原因，sharedpreferences无法正常工作。它应该保存按钮按下并存储时间的时间。但是，根据用户何时开始活动进行更改。 – user4792835

为什么要存储格式化的日期而不是从Calendar.getInstance（）中的long值？只要做到

if(..){ 
    editor.putLong("dateIn", Calendar.getInstance().getTimeInMillis()); 
} 
else{ 
    editor.putLong("dateIn", Calendar.getInstance().getTimeInMillis()); 
}

，然后他们。减去作为多头

long dateIn = sharedPreferences.getLong("dateIn", defaultValueIn); 
long dateOut = sharedPreferences.getLong("dateOut", defaultValueOut); 
long difference = dateOut - dateIn; 
int hoursBetween = difference/(1000*60*60)

现在你只需保存你自己的代码两页

来源

2016-03-08 18:46:37 Anonymous

减去两个时间字符串

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