TextChronometer.java

package in.lib.view;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.widget.TextView;

import in.lib.utils.DateRenderer;

/**
 * MPme
 * User: romainpiel
 * Date: 22/07/2013
 * Time: 08:00
 */
public class TextChronometer extends TextView
{
	private boolean isAttached;
	private long time;
	private DateRenderer dateRenderer;
	private boolean hasSeconds;
	private Handler handler;

	private final BroadcastReceiver mIntentReceiver = new BroadcastReceiver()
	{
		@Override public void onReceive(Context context, Intent intent)
		{
			onTimeChanged();
		}
	};

	private Runnable ticker;

	public TextChronometer(Context context)
	{
		this(context, null, 0);
	}

	public TextChronometer(Context context, AttributeSet attrs)
	{
		this(context, attrs, 0);
	}

	public TextChronometer(Context context, AttributeSet attrs, int defStyle)
	{
		super(context, attrs, defStyle);
		init(context);
	}

	public void setTime(long timeInMillis)
	{
		this.time = timeInMillis;
		onTimeChanged();
	}

	private void init(Context context)
	{
		dateRenderer = new DateRenderer(context);
		hasSeconds = true;
		handler = new Handler();
	}

	private void setupTicker()
	{
		if (hasSeconds && ticker == null)
		{
			ticker = new Runnable()
			{
				public void run()
				{
					onTimeChanged();

					long now = SystemClock.uptimeMillis();
					long next = now + (1000 - now % 1000) + 10000;

					handler.postAtTime(ticker, next);
				}
			};
			ticker.run();
		}
		else if (!hasSeconds && ticker != null)
		{
			handler.removeCallbacks(ticker);
			ticker = null;
		}
	}

	@Override protected void onAttachedToWindow()
	{
		super.onAttachedToWindow();

		if (!isAttached)
		{
			isAttached = true;

			registerReceiver();
			onTimeChanged();
		}
	}

	@Override protected void onDetachedFromWindow()
	{
		super.onDetachedFromWindow();

		if (isAttached)
		{
			unregisterReceiver();
			getHandler().removeCallbacks(ticker);

			isAttached = false;
		}
	}

	private void registerReceiver()
	{
		final IntentFilter filter = new IntentFilter();

		filter.addAction(Intent.ACTION_TIME_TICK);
		filter.addAction(Intent.ACTION_TIME_CHANGED);
		filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);

		getContext().registerReceiver(mIntentReceiver, filter, null, getHandler());
	}

	private void unregisterReceiver()
	{
		getContext().unregisterReceiver(mIntentReceiver);
	}

	private void onTimeChanged()
	{
		DateRenderer.TimeAgo timeAgo = dateRenderer.timeAgo(time);
		hasSeconds = timeAgo.unit.type.equals(DateRenderer.SECONDS);
		setupTicker();
		setText(timeAgo.formattedDate);
	}
}