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：
代码语言：javascript复制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() {
@Override
public 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
代码语言：javascript复制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 / 12
drgeeHour = 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
代码语言：javascript复制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。
代码语言：javascript复制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() {
@Override
public 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
代码语言：javascript复制@Override protected void onResume() {
......
/* begin */
DeskClockUtil.getInstance().onResume(this);
/* end */
if (mLauncherCallbacks != null) {
mLauncherCallbacks.onResume();
}
}
@Override
protected void onPause() {
// Ensure that items added to Launcher are queued until Launcher returns
InstallShortcutReceiver.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
总结
以上所述是小编给大家介绍的Android 8.1 Launcher3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ZaLou.Cn网站的支持！
