创建 SP 工具类，管理所有（除 ChannelUtils 以外）用户偏好设置

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

@@ -0,0 +1,49 @@
+package com.lizongying.mytv
+
+import android.content.Context
+import android.content.SharedPreferences
+
+object SP {
+    // Name of the sp file TODO Should use a meaningful name and do migrations
+    private const val SP_FILE_NAME = "MainActivity"
+    // if Change channel with up and down in reversed order or not
+    private const val KEY_CHANNEL_REVERSAL = "channel_reversal"
+    // If use channel num to select channel or not
+    private const val KEY_CHANNEL_NUM = "channel_num"
+    // If start app on device boot or not
+    private const val KEY_BOOT_STARTUP = "boot_startup"
+    // Position in list of the selected channel item
+    private const val KEY_POSITION = "position"
+    // guid
+    private const val KEY_GUID = "guid"
+    // guid
+    private lateinit var sp: SharedPreferences
+
+    /**
+     * The method must be invoked as early as possible(At least before using the keys)
+     */
+    fun init(context: Context) {
+        sp = context.getSharedPreferences(SP_FILE_NAME, Context.MODE_PRIVATE)
+    }
+
+    var channelReversal: Boolean
+        get() = sp.getBoolean(KEY_CHANNEL_REVERSAL, false)
+        set(value) = sp.edit().putBoolean(KEY_CHANNEL_REVERSAL, value).apply()
+
+    var channelNum: Boolean
+        get() = sp.getBoolean(KEY_CHANNEL_NUM, true)
+        set(value) = sp.edit().putBoolean(KEY_CHANNEL_NUM, value).apply()
+
+    var bootStartup: Boolean
+        // TODO It‘s more friendly to change the default value to false
+        get() = sp.getBoolean(KEY_BOOT_STARTUP, true)
+        set(value) = sp.edit().putBoolean(KEY_BOOT_STARTUP, value).apply()
+
+    var itemPosition: Int
+        get() = sp.getInt(KEY_POSITION, 0)
+        set(value) = sp.edit().putInt(KEY_POSITION, value).apply()
+
+    var guid: String
+        get() = sp.getString(KEY_GUID, "")  ?: ""
+        set(value) = sp.edit().putString(KEY_GUID, value).apply()
+}