remove StringBuffer on MD5 digest.

PonyCui · PonyCui · commit 97d7ae75ccbb · 2017-11-24T12:16:34.000+08:00
add cache tips.
diff --git a/library/src/main/java/com/opensource/svgaplayer/SVGAParser.kt b/library/src/main/java/com/opensource/svgaplayer/SVGAParser.kt
@@ -2,7 +2,9 @@ package com.opensource.svgaplayer
 
 import android.app.Activity
 import android.content.Context
+import android.net.http.HttpResponseCache
 import android.os.Handler
+import android.util.Log
 import com.opensource.svgaplayer.proto.MovieEntity
 
 import org.json.JSONObject
@@ -31,9 +33,15 @@ class SVGAParser(private val context: Context) {
 
     open class FileDownloader {
 
+        var noCache = false
+
         open fun resume(url: URL, complete: (inputStream: InputStream) -> Unit, failure: (e: Exception) -> Unit) {
             Thread({
                 try {
+                    if (HttpResponseCache.getInstalled() == null && !noCache) {
+                        Log.e("SVGAParser", "SVGAParser can not handle cache before install HttpResponseCache. see https://github.com/yyued/SVGAPlayer-Android#cache")
+                        Log.e("SVGAParser", "在配置 HttpResponseCache 前 SVGAParser 无法缓存. 查看 https://github.com/yyued/SVGAPlayer-Android#cache ")
+                    }
                     (url.openConnection() as? HttpURLConnection)?.let {
                         it.connectTimeout = 20 * 1000
                         it.requestMethod = "GET"
@@ -226,20 +234,16 @@ class SVGAParser(private val context: Context) {
         val messageDigest = MessageDigest.getInstance("MD5")
         messageDigest.update(str.toByteArray(charset("UTF-8")))
         val digest = messageDigest.digest()
-        val sb = StringBuffer()
+        var sb = ""
         for (b in digest) {
-            sb.append(String.format("%02x", b))
+            sb += String.format("%02x", b)
         }
-        return sb.toString()
+        return sb
     }
 
-    private fun cacheKey(url: URL): String {
-        return cacheKey(url.toString())
-    }
+    private fun cacheKey(url: URL): String = cacheKey(url.toString())
 
-    private fun cacheDir(cacheKey: String): File {
-        return File(context.cacheDir.absolutePath + "/" + cacheKey + "/")
-    }
+    private fun cacheDir(cacheKey: String): File = File(context.cacheDir.absolutePath + "/" + cacheKey + "/")
 
     private fun readAsBytes(inputStream: InputStream): ByteArray {
         val byteArrayOutputStream = ByteArrayOutputStream()
