扩展DigitalClock类显示日期和时间
DigitalClock类：
package com.ex.view;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import android.content.Context;
import android.content.res.Resources;
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;
public class DigitalClock extends android.widget.DigitalClock {
Calendar mCalendar;
private final static String mFormat = "EEEE,MMMM-dd-yyyy hh:mm aa";// h:mm:ss
// aa
private FormatChangeObserver mFormatChangeObserver;
private Runnable mTicker;
private Handler mHandler;
private boolean mTickerStopped = false;
public DigitalClock(Context context) {
super(context);
initClock(context);
}
public DigitalClock(Context context, AttributeSet attrs) {
super(context, attrs);
initClock(context);
}
private void initClock(Context context) {
Resources r = context.getResources();
if (mCalendar == null) {
mCalendar = Calendar.getInstance();
}
mFormatChangeObserver = new FormatChangeObserver();
getContext().getContentResolver().registerContentObserver(
Settings.System.CONTENT_URI, true, mFormatChangeObserver);
}
@Override
protected void onAttachedToWindow() {
mTickerStopped = false;
super.onAttachedToWindow();
mHandler = new Handler();
mTicker = new Runnable() {
@Override
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();
}
private class FormatChangeObserver extends ContentObserver {
public FormatChangeObserver() {
super(new Handler());
}
@Override
public void onChange(boolean selfChange) {
}
}
}
布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.ex.view.DigitalClock
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
