设置图片缓存磁盘上限200M（系统缓存图片，具体逻辑不清楚）

@@ -16,6 +16,7 @@ import { HostEnum, HostManager, WDHttp } from 'wdNetwork/Index'
 import { registerRouter } from 'wdRouter/Index'
 import { TrackingModule } from 'wdTracking/Index'
 import { JSON } from '@kit.ArkTS'
+import app from '@system.app'
 
 const TAG = "[StartupManager]"
 
@@ -36,6 +37,8 @@ export class StartupManager {
   appOnCreate(want: Want, launchParam: AbilityConstant.LaunchParam, context: common.UIAbilityContext) {
     Logger.debug(TAG, "App onCreate: " + `\nwant: ${want}\nlaunchParam: ${launchParam}`)
     this.context = context
+    // 设置图片文件数据缓存上限为200MB (200MB=200*1024*1024B=209715200B)
+    app.setImageFileCacheSize(209715200)
 
     // KV存储
     SPHelper.init(context);