how to make digital clock display only hours and minutes

Question

I have a digital clock on an activity in my app and I want to display only hours and minutes on it and don't want to display seconds.

Answer 1

Please take a look at this answer here, and as far as I can see you are looking for a similar/same thing:

Android: DigitalClock remove seconds

The main content of the answer follows:

Like AnalogClock, but digital. Shows seconds. FIXME: implement separate views for hours/minutes/seconds, so proportional fonts don't shake rendering.

Judging by the FIXME, the ability to hide portions of DigitalClock might be implemented eventually. I didn't find anything currently in the Javadoc or source code that would do what you want it to. Unless you want to write your own class that extends DigitalClock (or your own clock implementation altogether), you could just cover the seconds portion of the DigitalClock with another element if it would serve your purpose.

Answer 2

import android.content.Context;
import android.database.ContentObserver;
import android.os.Handler;
import android.os.SystemClock;
import android.provider.Settings;
import android.text.format.DateFormat;
import android.util.AttributeSet;
import android.widget.TextView;

import java.util.Calendar;

public class DigitalClock extends TextView {

    Calendar mCalendar;
    private final static String m24 = "k:mm";
    private FormatChangeObserver mFormatChangeObserver;

    private Runnable mTicker;
    private Handler mHandler;

    private boolean mTickerStopped = false;

    String mFormat;

    public DigitalClock(Context context) {
        super(context);
        initClock(context);
    }

    public DigitalClock(Context context, AttributeSet attrs) {
        super(context, attrs);
        initClock(context);
    }

    private void initClock(Context context) {
        if (mCalendar == null) {
            mCalendar = Calendar.getInstance();
        }

        mFormatChangeObserver = new FormatChangeObserver();
        getContext().getContentResolver().registerContentObserver(
                Settings.System.CONTENT_URI, true, mFormatChangeObserver);

        setFormat();
    }

    @Override
    protected void onAttachedToWindow() {
        mTickerStopped = false;
        super.onAttachedToWindow();
        mHandler = new Handler();

        /**
         * requests a tick on the next hard-second boundary
         */
        mTicker = new Runnable() {
                public void run() {
                    if (mTickerStopped) return;
                    mCalendar.setTimeInMillis(System.currentTimeMillis());
                    setText(DateFormat.format(mFormat, mCalendar));
                    invalidate();
                    long now = SystemClock.uptimeMillis();
                    long next = now + (1000 - now % 1000);
                    mHandler.postAtTime(mTicker, next);
                }
            };
        mTicker.run();
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        mTickerStopped = true;
    }


    private void setFormat() {
            mFormat = m24;

    }

    private class FormatChangeObserver extends ContentObserver {
        public FormatChangeObserver() {
            super(new Handler());
        }

        @Override
        public void onChange(boolean selfChange) {
            setFormat();
        }
    }
}

You can use this custom view. This works with gingerbread also. Change the time format to your liking.(m24)

Answer 3

The system sends a broadcast event at the exact beginning of every minutes based on system clock. The most reliable way is to do it like this :

BroadcastReceiver _broadcastReceiver;
private final SimpleDateFormat _sdfWatchTime = new SimpleDateFormat("HH:mm");
private TextView _tvTime;

@Override
public void onStart() {
    super.onStart();
    _broadcastReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context ctx, Intent intent) {
                if (intent.getAction().compareTo(Intent.ACTION_TIME_TICK) == 0)
                    _tvTime.setText(_sdfWatchTime.format(new Date()));
            }
        };

    registerReceiver(_broadcastReceiver, new IntentFilter(Intent.ACTION_TIME_TICK));
}

@Override
public void onStop() {
    super.onStop();
    if (_broadcastReceiver != null)
        unregisterReceiver(_broadcastReceiver);
}

Don't forget however to initialize your TextView beforehand (to current system time) since it is likely you will pop your UI in the middle of a minute and the TextView won't be updated until the next minute happens.