Android 8.1 Launcher3实现动态指针时钟

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：

import android.content.Context;
import android.graphics.Bitmap;
import android.os.Handler;
import android.os.Message;
import com.android.launcher3.ItemInfo;
import com.android.launcher3.LauncherSettings;
import com.android.launcher3.ShortcutInfo;
import com.android.launcher3.util.LogUtil;public class DeskClockUtil {private OnDeskClockIconChangeListener mListener;private ItemInfo mItemInfo;private boolean mIsResume;private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);if (msg.what == 100) {Message msg1 = new Message();msg1.what = 100;msg1.obj = msg.obj;mHandler.sendMessageDelayed(msg1, 60000);if (mListener != null && mItemInfo != null) {mListener.onChange(IconUtil.getDeskClockIcon((Context) msg.obj), mItemInfo);}}}};private static DeskClockUtil sInstance;private DeskClockUtil() {}public static DeskClockUtil getInstance() {if (sInstance == null) {sInstance = new DeskClockUtil();}return sInstance;}private void refresh(Context context) {if (mListener != null && mItemInfo != null) {mListener.onChange(IconUtil.getDeskClockIcon(context), mItemInfo);}if (mHandler.hasMessages(100)) {mHandler.removeMessages(100);}Message msg = new Message();msg.what = 100;msg.obj = context;mHandler.sendMessageDelayed(msg,1000 * (60 - Integer.parseInt(DateUtils.getCurrentSecond())));}public void onResume(Context context) {mIsResume = true;refresh(context);}public void onPause() {mIsResume = false;mHandler.removeMessages(100);}public void setListener(OnDeskClockIconChangeListener listener, ItemInfo info, Context context) {if (!(info instanceof ShortcutInfo)) {return;}String pkg = 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);}}public interface OnDeskClockIconChangeListener {void onChange(Bitmap icon, ItemInfo info);}}

画出动态时钟

import android.content.Context;
import android.graphics.*;
import com.android.launcher3.R;public class IconUtil {private static final String TAG = "IconUtil";private static Bitmap getBitmap(Context context, int res) {BitmapFactory.Options options = new BitmapFactory.Options();options.inPreferredConfig = Bitmap.Config.ARGB_4444;return BitmapFactory.decodeResource(context.getResources(), res, options);}public static Bitmap getDeskClockIcon(Context context) {// 添加一个带表盘的背景图Bitmap empty = getBitmap(context, R.drawable.icon_time);int x = empty.getWidth();int y = empty.getHeight();Bitmap deskClock = Bitmap.createBitmap(x, y, Bitmap.Config.ARGB_4444);Canvas canvas = new Canvas(deskClock);Paint paint = new Paint();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int radius = 35;// 圆心的x y 坐标int cx = x / 2;int cy = y / 2;int hour = Integer.parseInt(DateUtils.getCurrentHour());int min = 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int drgeeHour = 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 / 12drgeeHour += min * 6 / 12;//时针 针尖的x y坐标，相当于已知圆心坐标和半径，求圆上任意一点的坐标int xHour = (int) (cx + radius * Math.cos(drgeeHour * 3.14 / 180));int yHour = (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int drgeeMin = min * 6 - 90;if (drgeeMin < 0) {drgeeMin += 360;}//分针 针尖的x y坐标int x1 = (int) (cx + radius * Math.cos(drgeeMin * Math.PI / 180));int y1 = (int) (cy + radius * Math.sin(drgeeMin * Math.PI / 180));canvas.drawLine(x1, y1, cx, cy, paint);return deskClock;}}

时间工具类

import java.text.SimpleDateFormat;public class DateUtils {public static String getCurrentDay() {SimpleDateFormat format = new SimpleDateFormat("dd");Long t = new Long(System.currentTimeMillis());String d = format.format(t);return d;}public static String getCurrentSecond() {SimpleDateFormat format = new SimpleDateFormat("ss");Long t = new Long(System.currentTimeMillis());String d = format.format(t);return d;}public static String getCurrentMin() {SimpleDateFormat format = new SimpleDateFormat("mm");Long t = new Long(System.currentTimeMillis());String d = format.format(t);return d;}public static String getCurrentHour() {SimpleDateFormat format = new SimpleDateFormat("HH");Long t = new Long(System.currentTimeMillis());String d = format.format(t);return d;}}

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。

private void applyIconAndLabel(Bitmap icon, ItemInfo info) {/*  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);}}private void setDeskClockIcon(ItemInfo info) {DeskClockUtil.getInstance().setListener(new DeskClockUtil.OnDeskClockIconChangeListener() {@Overridepublic void onChange(Bitmap icon, ItemInfo info) {applyIcon(icon, info);}}, info, getContext());}private void applyIcon(Bitmap icon, ItemInfo info) {FastBitmapDrawable iconDrawable = 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

@Overrideprotected void onResume() {....../* begin */DeskClockUtil.getInstance().onResume(this);/*  end */if (mLauncherCallbacks != null) {mLauncherCallbacks.onResume();}}

@Overrideprotected void onPause() {// Ensure that items added to Launcher are queued until Launcher returnsInstallShortcutReceiver.enableInstallQueue(InstallShortcutReceiver.FLAG_ACTIVITY_PAUSED);super.onPause();mPaused = true;mDragController.cancelDrag();mDragController.resetLastGestureUpTime();// We call onHide() aggressively. The custom content callbacks should be able to// debounce excess onHide calls.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

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Android 8.1 Launcher3实现动态指针时钟

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