修改Launcher3应用Icon的样式

来源：互联网发布：python安装pip命令编辑：程序博客网时间：2024/05/14 22:37

Launcher3中IconCache很明显是用于应用Icon缓存。

在Launcher3的Java文件IconCacher.java:
/**
   * Fill in "application" with the icon and label for "info."
   */
   public void getTitleAndIcon(AppInfo application, ResolveInfo info,
           HashMap<Object, CharSequence> labelCache) {
       synchronized (mCache) {
           CacheEntry entry = cacheLocked(application.componentName, info,
                   labelCache);

           application.title = entry.title;
           application.iconBitmap = entry.icon;
       }
   }
该函数就是获取应用的title和icon。

CacheEntry也就是：
private static class CacheEntry {
       public Bitmap icon;
       public String title;
   }
该类对象中只保存应用的Icon和title。

cacheLocked（）函数就是：
private CacheEntry cacheLocked(ComponentName componentName,
           ResolveInfo info, HashMap<Object, CharSequence> labelCache) {
       CacheEntry entry = mCache.get(componentName); // 从缓存中获取对象
       if (entry == null) {
           entry = new CacheEntry();

           mCache.put(componentName, entry);

           if (info != null) {
               ComponentName key = LauncherModel
                       .getComponentNameFromResolveInfo(info);
               if (labelCache != null && labelCache.containsKey(key)) {
                   entry.title = labelCache.get(key).toString();
               } else {
                   entry.title = info.loadLabel(mPackageManager).toString();
                   if (labelCache != null) {
                       labelCache.put(key, entry.title);
                   }
               }
               if (entry.title == null) {
                   entry.title = info.activityInfo.name;
               }

               switch (model) {
               case 0:
                   entry.icon = Utilities.createIconBitmap(
                           getFullResIcon(info), mContext);
                   break;
               case 1:
                   entry.icon = Utilities.createFramedPhoto2(themeBg1_new,   //圆形图标
                           getFullResIcon(info));
                   break;
               case 2:
                   entry.icon = Utilities.createFramedPhoto2(themeBg2_new,
                           getFullResIcon(info));
                   break;
               case 3:
                   entry.icon = Utilities.createFramedPhoto3(themeBg3_new, //方形图标
                           getFullResIcon(info));
                   break;
               case 4:
                   entry.icon = Utilities.createFramedPhoto2(themeBg4_new, getFullResIcon(info));
                   break;
               case 5:
                   entry.icon = Utilities.createFramedPhoto3(themeBg5_new, getFullResIcon(info));
                   break;
               case 6:
                   entry.icon = Utilities.createFramedPhoto2(themeBg6_new, getFullResIcon(info));
                   break;
               case 7:
                   entry.icon = Utilities.createFramedPhoto2(themeBg7_new, getFullResIcon(info));
                   break;
               case 8:
                   entry.icon = Utilities.createFramedPhoto3(themeBg8_new, getFullResIcon(info));
                   break;
               case 9:
                   entry.icon = Utilities.createFramedPhoto2(themeBg9_new, getFullResIcon(info));
                   break;
               case 10:
                   entry.icon = Utilities.createFramedPhoto2(themeBg10_new, getFullResIcon(info));
                   break;
               case 11:
                   entry.icon = Utilities.createFramedPhoto2(themeBg11_new, getFullResIcon(info));
                   break;
//               case 1:
//                   Bitmap iconOld = Utilities.createIconBitmap(
//                           getFullResIcon(info), mContext);
//                   int width = iconOld.getWidth();
//                   int height = iconOld.getHeight();
//                   Bitmap icon = iconOld.createScaledBitmap(iconOld, width,
//                           height, true);
//                   int bgcolor = Utilities.getBackgroundColor(icon); // 获取背景颜色
//                   int outerRadiusRat = 12;
//                   entry.icon = Utilities.createFramedPhoto(icon,
//                           outerRadiusRat, bgcolor);
//                   break;
//               case 2: // 圆圈图片
//                   entry.icon = Utilities.createFramedPhoto2(themeBg2,
//                           getFullResIcon(info));
//                   break;
//               case 3: // 方框图片
//                   entry.icon = Utilities.createFramedPhoto3(themeBg3,
//                           getFullResIcon(info));
//                   break;
               default:
                   entry.icon = Utilities.createIconBitmap(
                           getFullResIcon(info), mContext);
                   break;
               }

           } else {
               entry.title = "";
               Bitmap preloaded = getPreloadedIcon(componentName);
               if (preloaded != null) {
                   if (DEBUG)
                       Log.d(TAG,
                               "using preloaded icon for "
                                       + componentName.toShortString());
                   entry.icon = preloaded;
               } else {
                   if (DEBUG)
                       Log.d(TAG,
                               "using default icon for "
                                       + componentName.toShortString());
                   entry.icon = mDefaultIcon;
               }
           }
       }
       return entry;
   }

首先从我们的缓存中获取，如果有就直接返回，如果没有就去获取。获取title也一样，先从缓存中获取，如果有就使用，如果没有就从应用的信息中获取。

entry.icon = Utilities.createIconBitmap(getFullResIcon(info), mContext);
Launcher原来的自带的获取Icon的方法，

entry.icon = Utilities.createFramedPhoto2(themeBg1_new,getFullResIcon(info));//圆形图标
我们自己修改的获取出来的Icon的方法，这样Launcher中的Icon图标就是我们希望修改的图标。该方法定义在Utilities.java的文件中。

最后，在我们点击修改样式的时候，调用重新启动Launcher的方法，Launcher将会重新加载，应用图标也就会重新加载。
ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
am.restartPackage("com.android.nfc");

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