減去兩個時間字符串

我有兩個名爲clockedin和clockedout的字符串變量。我把它們放在共享首選項中，現在我試圖調用它們並將它們轉換爲整數，這樣我就可以在時鐘的時間內減去超時的時間以查看工作了多少個小時。減去兩個時間字符串

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); 


}}

我的轉換方法：

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); 

       } 

      } 
     }); 
     }

我的日誌attatched enter image description here

來源

2016-03-08 user4792835

你剛纔不是問這個約5小時前？ – ctst

是的，但現在我有日誌 – user4792835

totalhours.setText（（int）的hourA）;

應該是：totalhours.setText（String.valueOf（hourA））; 或 totalhours.setText（「」+ hourA）;

如果您使用整數調用setText，它將查找具有該ID的字符串資源。

來源

2016-03-08 18:20:48 mukeshshenoy

謝謝。但現在我有另一個問題。由於某些原因，sharedpreferences無法正常工作。它應該保存按鈕按下並存儲時間的時間。但是，根據用戶何時開始活動進行更改。 – user4792835

爲什麼要存儲格式化的日期而不是從Calendar.getInstance（）中的long值？只要做到

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

，然後他們。減去作爲多頭

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

現在你只需保存你自己的代碼兩頁

來源

2016-03-08 18:46:37 Anonymous

減去兩個時間字符串

回答

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