完成专门的ChannelUtils

app/src/main/java/com/lizongying/mytv/ChannelUtils.kt

@@ -0,0 +1,154 @@
+package com.lizongying.mytv
+
+import android.content.Context
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import java.io.File
+
+/**
+ *@author LeGend
+ *@date 2024/2/4 22:42
+ */
+object ChannelUtils {
+    /**
+     * 获取服务器channel版本
+     *
+     * @param context Context
+     *
+     * @return 服务器channel版本
+     */
+    suspend fun getServerVersion(context: Context): Int {
+        return withContext(Dispatchers.IO) {
+            val client = okhttp3.OkHttpClient()
+            val request = okhttp3.Request.Builder().url(getServerVersionUrl(context)).build()
+            client.newCall(request).execute().use { response ->
+                if (!response.isSuccessful) throw java.io.IOException("Unexpected code $response")
+                val body = response.body()
+                body?.string()?.toInt() ?: 0
+            }
+        }
+    }
+
+    /**
+     * 获取服务器channel
+     *
+     * @param url String 服务器地址
+     *
+     * @return Array<TV> 服务器channel
+     *
+     * @throws java.io.IOException 网络请求失败
+     */
+    suspend fun getServerChannel(url: String): List<TV> {
+        val result = withContext(Dispatchers.IO) {
+            val client = okhttp3.OkHttpClient()
+            val request = okhttp3.Request.Builder().url(url).build()
+            client.newCall(request).execute().use { response ->
+                if (!response.isSuccessful) throw java.io.IOException("Unexpected code $response")
+                val body = response.body()
+                body?.string() ?: ""
+            }
+        }
+        return withContext(Dispatchers.Default) {
+            val type = object : com.google.gson.reflect.TypeToken<List <TV>>() {}.type
+            com.google.gson.Gson().fromJson(result, type)
+        }
+    }
+
+    /**
+     * 获取服务器地址
+     *
+     * @param context Context
+     *
+     * @return 服务器地址
+     */
+    fun getServerUrl(context: Context): String {
+        return context.resources.getString(R.string.server_url)
+    }
+
+    /**
+     * 获取serverVersion的URL
+     *
+     * @param context Context
+     *
+     * @return serverVersionURL 服务器版本地址
+     */
+    suspend fun getServerVersionUrl(context: Context): String {
+        return withContext(Dispatchers.IO) {
+            context.resources.getString(R.string.server_version_url)
+        }
+    }
+
+
+    /**
+     * 获取本地channel版本
+     *
+     * @param context Context
+     *
+     * @return 本地channel
+     */
+    suspend fun getLocalVersion(context: Context): Int {
+        return withContext(Dispatchers.IO) {
+            val file = File(getAppDirectory(context), "channels")
+            val savedVersion =
+                context.getSharedPreferences("saved_version", Context.MODE_PRIVATE).getInt("version", Integer.MIN_VALUE)
+            if (!file.exists() || savedVersion == Integer.MIN_VALUE) {
+                context.resources.getInteger(R.integer.local_channel_version)
+            } else {
+                savedVersion
+            }
+        }
+    }
+
+    /**
+     * 获取本地可读取的目录
+     * @param context Context
+     *
+     * @return 可读取的目录
+     */
+    private fun getAppDirectory(context: Context): File {
+        return context.filesDir
+    }
+
+    /**
+     * 获取本地channel
+     *
+     * @param context Context
+     *
+     * @return Array<TV> 本地channel
+     */
+    suspend fun getLocalChannel(context: Context): List<TV> {
+        var str = withContext(Dispatchers.IO) {
+            if (File(getAppDirectory(context), "channels").exists()) {
+                File(getAppDirectory(context), "channels").readText()
+            } else {
+                context.resources.openRawResource(R.raw.channels).bufferedReader().use { it.readText() }
+            }
+        }
+        return withContext(Dispatchers.Default) {
+            val type = object : com.google.gson.reflect.TypeToken<List<TV>>() {}.type
+            com.google.gson.Gson().fromJson(str, type)
+        }
+    }
+
+    /**
+     * 更新channels.json
+     *
+     * @param context Context
+     *
+     * @return 无
+     *
+     * @throws java.io.IOException 写入失败
+     */
+    suspend fun updateLocalChannel(context: Context, version: Int, channels: List<TV>) {
+        withContext(Dispatchers.IO) {
+            val file = File(getAppDirectory(context), "channels")
+            if (!file.exists()) {
+                file.createNewFile()
+            }
+            file.writeText(com.google.gson.Gson().toJson(channels))
+            context.getSharedPreferences("saved_version", Context.MODE_PRIVATE).edit().putInt(
+                "version", version
+            ).apply()
+        }
+    }
+}