android Digital Clock

最新推荐文章于 2023-07-07 22:57:13 发布

pjpsmile

最新推荐文章于 2023-07-07 22:57:13 发布

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分类专栏： android Digital 文章标签： android Digital

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本文介绍了一个自定义的DigitalClock组件的实现细节，该组件能够显示24小时制或12小时制的时间，并根据系统设置自动切换。文章深入探讨了其核心代码结构、时间更新机制及格式调整逻辑。

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package net.flync.pc2.tv.widget;

import java.util.Calendar;

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 m12 = "aa h:mm";//h:mm:ss aa

private final static String m24 = "k:mm";//k:mm:ss

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) {

Resources r = context.getResources();

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;

}

/**

* Pulls 12/24 mode from system settings

*/

private boolean get24HourMode() {

return android.text.format.DateFormat.is24HourFormat(getContext());

}

private void setFormat() {

if (get24HourMode()) {

mFormat = m24;

} else {

mFormat = m12;

}

}

private class FormatChangeObserver extends ContentObserver {

public FormatChangeObserver() {

super(new Handler());

}

@Override

public void onChange(boolean selfChange) {

setFormat();

}

}

}