diff --git a/app/src/main/java/com/lizongying/mytv/Utils.kt b/app/src/main/java/com/lizongying/mytv/Utils.kt
index dddda49..8f56a45 100644
--- a/app/src/main/java/com/lizongying/mytv/Utils.kt
+++ b/app/src/main/java/com/lizongying/mytv/Utils.kt
@@ -1,10 +1,12 @@
 package com.lizongying.mytv
 
+import android.content.Context
 import android.content.res.Resources
 import android.util.TypedValue
+import java.io.File
 import java.text.SimpleDateFormat
-import java.util.Date
-import java.util.Locale
+import java.util.*
+import java.io.IOException
 
 object Utils {
     fun getDateFormat(format: String): String {
@@ -17,17 +19,58 @@ object Utils {
 
     fun dpToPx(dp: Float): Int {
         return TypedValue.applyDimension(
-            TypedValue.COMPLEX_UNIT_DIP,
-            dp,
-            Resources.getSystem().displayMetrics
+            TypedValue.COMPLEX_UNIT_DIP, dp, Resources.getSystem().displayMetrics
         ).toInt()
     }
 
     fun dpToPx(dp: Int): Int {
         return TypedValue.applyDimension(
-            TypedValue.COMPLEX_UNIT_DIP,
-            dp.toFloat(),
-            Resources.getSystem().displayMetrics
+            TypedValue.COMPLEX_UNIT_DIP, dp.toFloat(), Resources.getSystem().displayMetrics
         ).toInt()
     }
+
+    /**
+     * 获取可读写的目录
+     *
+     * @param context 应用环境信息
+     *
+     * @return 可读写的目录
+     *
+     */
+    fun getAppDirectory(context: Context): File {
+        return context.filesDir
+    }
+
+    /**
+     * 更新channels.json
+     *
+     * @param context 应用环境信息
+     *
+     * @return 无
+     *
+     * @throws IOException 网络请求失败
+     */
+    fun updateChannel(context: Context) {
+        val client = okhttp3.OkHttpClient()
+        val request = okhttp3.Request.Builder().url(getServerUrl(context)).build()
+        client.newCall(request).execute().use { response ->
+            if (!response.isSuccessful) throw IOException("Unexpected code $response")
+            val body = response.body()
+            //覆盖channels.json
+            val file = File(getAppDirectory(context), "channels.json")
+            if (!file.exists()) {
+                file.createNewFile()
+            }
+            file.writeText(body!!.string())
+        }
+    }
+
+    /**
+     * 从res/values/server.xml获取服务器地址
+     * @param context 应用环境信息
+     * @return 服务器地址
+     */
+    fun getServerUrl(context: Context): String {
+        return context.resources.getString(R.string.server_url)
+    }
 }
\ No newline at end of file