正文
一、需求
修改时间输出格式为仅显示小时和分钟。
二、效果图
三、说明
通过看源码可知,只需修改以下两行代码其他全部复制过来即可:
private final static String m12 = "h:mm:ss aa";
private final static String m24 = "k:mm:ss";
private final static String m24 = "k:mm:ss";
如果想做得更好更通用的话可以把设置日期格式的方法暴露出来,或者为其增加一个xml属性。
四、完整代码
package com.test;
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;
/**
* 自定义DigitalClock输出格式
* @author 农民伯伯
*
*/
public class DigitalClock extends android.widget.DigitalClock {
Calendar mCalendar;
private final static String m12 = "h:mm aa";//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();
}
}
}
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;
/**
* 自定义DigitalClock输出格式
* @author 农民伯伯
*
*/
public class DigitalClock extends android.widget.DigitalClock {
Calendar mCalendar;
private final static String m12 = "h:mm aa";//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();
}
}
}
五、使用方法
<com.test.DigitalClock android:layout_x="15dp" android:layout_y="30dp"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:textColor="@android:color/white" android:textSize="55sp"
android:shadowColor="@android:color/white" android:shadowRadius="2.0"
>
</com.test.DigitalClock>
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:textColor="@android:color/white" android:textSize="55sp"
android:shadowColor="@android:color/white" android:shadowRadius="2.0"
>
</com.test.DigitalClock>
代码说明:
关于android:shadowColor可以参见我的中文API文档翻译。
本文转自over140 51CTO博客,原文链接:http://blog.51cto.com/over140/582230,如需转载请自行联系原作者