Android 8.1 Launcher3实现动态指针时钟功能
本文主要实现功能，可能有不合理的地方
首先创建一个实现功能的工具里，直接上代码：
importandroid.content.Context;
importandroid.graphics.Bitmap;
importandroid.os.Handler;
importandroid.os.Message;
importcom.android.launcher3.ItemInfo;
importcom.android.launcher3.LauncherSettings;
importcom.android.launcher3.ShortcutInfo;
importcom.android.launcher3.util.LogUtil;
publicclassDeskClockUtil{
privateOnDeskClockIconChangeListenermListener;
privateItemInfomItemInfo;
privatebooleanmIsResume;
privateHandlermHandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
super.handleMessage(msg);
if(msg.what==100){
Messagemsg1=newMessage();
msg1.what=100;
msg1.obj=msg.obj;
mHandler.sendMessageDelayed(msg1,60000);
if(mListener!=null&&mItemInfo!=null){
mListener.onChange(IconUtil.getDeskClockIcon((Context)msg.obj),mItemInfo);
}
}
}
};
privatestaticDeskClockUtilsInstance;
privateDeskClockUtil(){
}
publicstaticDeskClockUtilgetInstance(){
if(sInstance==null){
sInstance=newDeskClockUtil();
}
returnsInstance;
}
privatevoidrefresh(Contextcontext){
if(mListener!=null&&mItemInfo!=null){
mListener.onChange(IconUtil.getDeskClockIcon(context),mItemInfo);
}
if(mHandler.hasMessages(100)){
mHandler.removeMessages(100);
}
Messagemsg=newMessage();
msg.what=100;
msg.obj=context;
mHandler.sendMessageDelayed(msg,
1000*(60-Integer.parseInt(DateUtils.getCurrentSecond())));
}
publicvoidonResume(Contextcontext){
mIsResume=true;
refresh(context);
}
publicvoidonPause(){
mIsResume=false;
mHandler.removeMessages(100);
}
publicvoidsetListener(OnDeskClockIconChangeListenerlistener,ItemInfoinfo,Contextcontext){
if(!(infoinstanceofShortcutInfo)){
return;
}
Stringpkg=null;
if(info.getIntent()!=null&&info.getIntent().getComponent()!=null){
pkg=info.getIntent().getComponent().getPackageName();
}
if(!"com.android.deskclock".equals(pkg)||info.itemType==LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT){
return;
}
mListener=listener;
mItemInfo=info;
if(mIsResume){
refresh(context);
}
}
publicinterfaceOnDeskClockIconChangeListener{
voidonChange(Bitmapicon,ItemInfoinfo);
}
}
画出动态时钟
importandroid.content.Context;
importandroid.graphics.*;
importcom.android.launcher3.R;
publicclassIconUtil{
privatestaticfinalStringTAG="IconUtil";
privatestaticBitmapgetBitmap(Contextcontext,intres){
BitmapFactory.Optionsoptions=newBitmapFactory.Options();
options.inPreferredConfig=Bitmap.Config.ARGB_4444;
returnBitmapFactory.decodeResource(context.getResources(),res,options);
}
publicstaticBitmapgetDeskClockIcon(Contextcontext){
//添加一个带表盘的背景图
Bitmapempty=getBitmap(context,R.drawable.icon_time);
intx=empty.getWidth();
inty=empty.getHeight();
BitmapdeskClock=Bitmap.createBitmap(x,y,Bitmap.Config.ARGB_4444);
Canvascanvas=newCanvas(deskClock);
Paintpaint=newPaint();
paint.setAntiAlias(true);
canvas.drawBitmap(empty,0,0,paint);
//设置圆角
paint.setStrokeCap(Paint.Cap.ROUND);
paint.setStrokeWidth(5);
paint.setColor(context.getResources().getColor(R.color.deskclock_time));
//时针的长度
intradius=35;
//圆心的xy坐标
intcx=x/2;
intcy=y/2;
inthour=Integer.parseInt(DateUtils.getCurrentHour());
intmin=Integer.parseInt(DateUtils.getCurrentMin());
//时针的角度，这里是整点的角度。因为0°是从3点开始，所以这里减90°，从9点开始计算角度
intdrgeeHour=hour*30-90;
if(drgeeHour<0){
drgeeHour+=360;
}
//加上时针在两个整点之间的角度，一分钟在分针上是6°，在时针上是min*6/12
drgeeHour+=min*6/12;
//时针针尖的xy坐标，相当于已知圆心坐标和半径，求圆上任意一点的坐标
intxHour=(int)(cx+radius*Math.cos(drgeeHour*3.14/180));
intyHour=(int)(cy+radius*Math.sin(drgeeHour*3.14/180));
canvas.drawLine(xHour,yHour,cx,cy,paint);
//分针的长度
radius=45;
paint.setStrokeWidth(3);
paint.setColor(Color.RED);
//分针的角度
intdrgeeMin=min*6-90;
if(drgeeMin<0){
drgeeMin+=360;
}
//分针针尖的xy坐标
intx1=(int)(cx+radius*Math.cos(drgeeMin*Math.PI/180));
inty1=(int)(cy+radius*Math.sin(drgeeMin*Math.PI/180));
canvas.drawLine(x1,y1,cx,cy,paint);
returndeskClock;
}
}
时间工具类
importjava.text.SimpleDateFormat;
publicclassDateUtils{
publicstaticStringgetCurrentDay(){
SimpleDateFormatformat=newSimpleDateFormat("dd");
Longt=newLong(System.currentTimeMillis());
Stringd=format.format(t);
returnd;
}
publicstaticStringgetCurrentSecond(){
SimpleDateFormatformat=newSimpleDateFormat("ss");
Longt=newLong(System.currentTimeMillis());
Stringd=format.format(t);
returnd;
}
publicstaticStringgetCurrentMin(){
SimpleDateFormatformat=newSimpleDateFormat("mm");
Longt=newLong(System.currentTimeMillis());
Stringd=format.format(t);
returnd;
}
publicstaticStringgetCurrentHour(){
SimpleDateFormatformat=newSimpleDateFormat("HH");
Longt=newLong(System.currentTimeMillis());
Stringd=format.format(t);
returnd;
}
}
下面就比较简单了，我是在BubbleTextView.java中添加listener，我这里偷懒了，应该给时钟单独创建一个view，继承BubbleTextView。
privatevoidapplyIconAndLabel(Bitmapicon,ItemInfoinfo){
/*begin*/
setDeskClockIcon(info);
/*end*/
applyIcon(icon,info);
setText(info.title);
if(info.contentDescription!=null){
setContentDescription(info.isDisabled()
?getContext().getString(R.string.disabled_app_label,info.contentDescription)
:info.contentDescription);
}
}
privatevoidsetDeskClockIcon(ItemInfoinfo){
DeskClockUtil.getInstance().setListener(newDeskClockUtil.OnDeskClockIconChangeListener(){
@Override
publicvoidonChange(Bitmapicon,ItemInfoinfo){
applyIcon(icon,info);
}
},info,getContext());
}
privatevoidapplyIcon(Bitmapicon,ItemInfoinfo){
FastBitmapDrawableiconDrawable=DrawableFactory.get(getContext()).newIcon(icon,info);
iconDrawable.setIsDisabled(info.isDisabled());
setIcon(iconDrawable);
}
在Launcher.java的onResume()和onPause()中分别开始和暂停
@OverrideprotectedvoidonResume(){
......
/*begin*/
DeskClockUtil.getInstance().onResume(this);
/*end*/
if(mLauncherCallbacks!=null){
mLauncherCallbacks.onResume();
}
}
@Override
protectedvoidonPause(){
//EnsurethatitemsaddedtoLauncherarequeueduntilLauncherreturns
InstallShortcutReceiver.enableInstallQueue(InstallShortcutReceiver.FLAG_ACTIVITY_PAUSED);
super.onPause();
mPaused=true;
mDragController.cancelDrag();
mDragController.resetLastGestureUpTime();
//WecallonHide()aggressively.Thecustomcontentcallbacksshouldbeableto
//debounceexcessonHidecalls.
if(mWorkspace.getCustomContentCallbacks()!=null){
mWorkspace.getCustomContentCallbacks().onHide();
}
if(mLauncherCallbacks!=null){
mLauncherCallbacks.onPause();
}
/*begin*/
DeskClockUtil.getInstance().onPause();
/*end*/
}
这样就可以了，如果想要加秒针，在IconUtil中再把秒针画出来就行。
还有日历的动态图标也可以用同样的方法实现
总结
以上所述是小编给大家介绍的Android8.1Launcher3实现动态指针时钟功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对毛票票网站的支持！