android - 两次之间的时差

我想以hh:mm格式显示两次之间的差异。

第一次是来自数据库，第二次是系统时间。时差每秒更新一次。

我怎样才能做到这一点？

目前，我正在使用两次手动计时(如果可以正常使用)，然后将其实现到我的应用中。

public class MainActivity extends Activity
{
    TextView mytext;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Timer updateTimer = new Timer();
        updateTimer.schedule(new TimerTask()
        {
            public void run()
            {
                try
                {
                    TextView txtCurrentTime= (TextView)findViewById(R.id.mytext);
                    SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss aa");
                    Date date1 = format.parse("08:00:12 pm");
                    Date date2 = format.parse("05:30:12 pm");
                    long mills = date1.getTime() - date2.getTime();
                    Log.v("Data1", ""+date1.getTime());
                    Log.v("Data2", ""+date2.getTime());
                    int hours = (int) (mills/(1000 * 60 * 60));
                    int mins = (int) (mills % (1000*60*60));

                    String diff = hours + ":" + mins; // updated value every1 second
                    txtCurrentTime.setText(diff);
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }

        }, 0, 1000);
    }
}

最佳答案

要计算两个日期之间的时差，您可以尝试如下操作:

long millis = date1.getTime() - date2.getTime();
int hours = (int) (millis / (1000 * 60 * 60));
int mins = (int) ((millis / (1000 * 60)) % 60)

String diff = hours + ":" + mins;

要每秒更新时差，您可以使用计时器。

Timer updateTimer = new Timer();
updateTimer.schedule(new TimerTask() {
    public void run() {
        try {
            long mills = date1.getTime() - date2.getTime();
                int hours = millis/(1000 * 60 * 60);
                 int mins = (mills/(1000*60)) % 60;

                 String diff = hours + ":" + mins; // updated value every1 second
            } catch (Exception e) {
            e.printStackTrace();
        }
    }

}, 0, 1000); // here 1000 means 1000 mills i.e. 1 second

编辑:工作代码:

public class MainActivity extends Activity {

    private TextView txtCurrentTime;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txtCurrentTime= (TextView)findViewById(R.id.mytext);
        Timer updateTimer = new Timer();
        updateTimer.schedule(new TimerTask()
        {
            public void run()
            {
                try
                {

                    SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss aa");
                    Date date1 = format.parse("08:00:12 pm");
                    Date date2 = format.parse("05:30:12 pm");
                    long mills = date1.getTime() - date2.getTime();
                    Log.v("Data1", ""+date1.getTime());
                    Log.v("Data2", ""+date2.getTime());
                    int hours = (int) (mills/(1000 * 60 * 60));
                    int mins = (int) (mills/(1000*60)) % 60;

                    String diff = hours + ":" + mins; // updated value every1 second
                    txtCurrentTime.setText(diff);
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }

        }, 0, 1000);
    }

关于android - 两次之间的时差，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/15360123/