java - 减去两个时间字符串

Question

我有两个字符串变量，分别称为“clockedin”和“clockedout”。我将它们放在共享首选项中，现在我尝试调用它们并将它们转换为整数，这样我就可以从上类时间中减去下类时间来查看工作了多少小时。

    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);

                }

            }
        });
         }

附上我的日志enter image description here

Answer 1

totalhours.setText((int) hourA);

应该是:totalhours.setText(String.valueOf(hourA));或者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。