private fun copyAssetAndWrite(fileName: String): Boolean {
          try {
              val cacheDir = cacheDir
              if (!cacheDir.exists()) {
                  cacheDir.mkdirs()
              }
              val outFile = File(cacheDir, fileName)
              if (!outFile.exists()) {
                  val res = outFile.createNewFile()
                  if (!res) {
                      return false
                  }
              } else {
                  if (outFile.length() > 10) { 
                      return true
                  }
              }
              val `is`: InputStream = assets.open(fileName)
              val fos = FileOutputStream(outFile)
              val buffer = ByteArray(1024)
              var byteCount: Int
              while (`is`.read(buffer).also { byteCount = it } != -1) {
                  fos.write(buffer, 0, byteCount)
              }
              fos.flush()
              `is`.close()
              fos.close()
              return true
          } catch (e: IOException) {
              e.printStackTrace()
          }
          return false
      }

 //获取多主题色值ID
 SkinLoadManager.getInstance().getColor(attrValue)
 //获取多主题图片ID
 SkinLoadManager.getInstance().getDrawable(attrValue)
 //获取多主题字符串ID
 SkinLoadManager.getInstance().getTextString(attrValue)
 

   /**
    * 在Application中初始化多主题框架
    **/ 
   SkinLoadManager.getInstance().init(application)
   /**
    * Activity onCreate 前设置`multiThemeFactory`
    **/
   registerActivityLifecycleCallbacks(object : ActivityLifecycleCallbacks {
              override fun onActivityPreCreated(activity: Activity, savedInstanceState: Bundle?) {
                  super.onActivityPreCreated(activity, savedInstanceState)
                  activity.layoutInflater.factory = SkinLoadManager.getInstance().multiThemeFactory
              }
  
              override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
  
              }
  
              override fun onActivityStarted(activity: Activity) {
  
              }
  
              override fun onActivityResumed(activity: Activity) {
  
              }
  
              override fun onActivityPaused(activity: Activity) {
  
              }
  
              override fun onActivityStopped(activity: Activity) {
  
              }
  
              override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {
  
              }
  
              override fun onActivityDestroyed(activity: Activity) {
  
              }
  
          })
    /**
     * 换肤前，将换肤包从assets目录拷入应用内
     **/
    ArchTaskExecutor.getIOThreadExecutor().execute {
               copyAssetAndWrite(fileName)
               ArchTaskExecutor.getMainThreadExecutor().execute {
                   Toast.makeText(this,"成功",Toast.LENGTH_SHORT).show()
               }
    }
    /**
     * 传入拷贝后的多主题路径，执行多主题切换
     **/
    val dataFile = File(cacheDir, fileName)
    SkinLoadManager.getInstance().loadSkin(dataFile.absolutePath, object : ILoadListener {
                      override fun onStart() {
                          Log.i("Mistletoe", "onStart")
                      }
  
                      override fun onSuccess() {
                          Log.i("Mistletoe", "onSuccess")
                      }
  
                      override fun onFailed(e: SkinLoadException) {
                          Log.e("Mistletoe", "onFailed:${e.message}")
                      }
  
   })
     /**
      * 切换回App默认主题
      **/
    SkinLoadManager.getInstance().restoreDefaultTheme()

/**
* Created by mistletoe
* on 7/28/21
**/
class ImageForegroundAttr:BaseAttr() {
   override fun apply(view: View?) {
      when(view){
          is AppCompatImageView ->{
              if ("foreground".equals(attrName, true)) {
                  view.foreground = SkinLoadManager.getInstance().getDrawable(attrValue)
              }
          }
          is ImageView ->{
              if ("foreground".equals(attrName, true)) {
                  view.foreground = SkinLoadManager.getInstance().getDrawable(attrValue)
              }
          }
      }
   }
}

        //增加一个设置前景图片属性
        val configMap = mutableMapOf<String,Class<out BaseAttr>>().apply {
                  put("foreground",ImageForegroundAttr::class.java)
        }
        SkinLoadManager.getInstance().configCustomAttrs(configMap)