键盘主题设置
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pengxiaolong
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package com.example.myapplication.theme
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import android.content.Context
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import android.content.res.AssetManager
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import android.graphics.BitmapFactory
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import android.graphics.drawable.BitmapDrawable
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import android.graphics.drawable.Drawable
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import java.io.File
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object ThemeManager {
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// SharedPreferences 保存当前主题名
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private const val PREF_NAME = "ime_theme_prefs"
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private const val KEY_CURRENT_THEME = "current_theme"
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// 当前主题名（如 "default"）
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@Volatile
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private var currentThemeName: String? = null
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// 缓存：规范化后的 keyName(lowercase) -> Drawable
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@Volatile
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private var drawableCache: MutableMap<String, Drawable> = mutableMapOf()
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// ==================== 外部目录相关 ====================
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/** 主题根目录：/Android/data/<package>/files/keyboard_themes */
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private fun getThemeRootDir(context: Context): File =
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File(context.getExternalFilesDir(null), "keyboard_themes")
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/** 某个具体主题目录：/Android/.../keyboard_themes/<themeName> */
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private fun getThemeDir(context: Context, themeName: String): File =
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File(getThemeRootDir(context), themeName)
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// ==================== 内置主题拷贝（assets -> 外部目录） ====================
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/**
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* 确保 APK 自带的主题(assets/keyboard_themes/...) 已经复制到
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* /Android/data/.../files/keyboard_themes 目录下。
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*
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* 行为：
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* - 如果主题目录不存在：整套拷贝过去。
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* - 如果主题目录已经存在：只复制“新增文件”，不会覆盖已有文件。
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*
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* 建议在 IME 的 onCreate() 里调用一次。
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*/
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fun ensureBuiltInThemesInstalled(context: Context) {
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val am = context.assets
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val rootName = "keyboard_themes"
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val themeRootDir = getThemeRootDir(context)
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if (!themeRootDir.exists()) themeRootDir.mkdirs()
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// 列出 assets/keyboard_themes 下的所有子目录，比如 default、dark...
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val themeNames = am.list(rootName) ?: return
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for (themeName in themeNames) {
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val assetThemePath = "$rootName/$themeName" // 如 keyboard_themes/default
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val targetThemeDir = getThemeDir(context, themeName)
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copyAssetsDirToDir(am, assetThemePath, targetThemeDir)
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}
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}
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/**
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* 递归地将 assets 中的某个目录合并复制到目标 File 目录下。
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*
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* 规则：
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* - 如果目标目录不存在，则创建。
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* - 如果目标文件已存在，则跳过（不覆盖用户改过的图）。
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* - 如果是新文件，则复制过去（补充新图）。
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*/
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private fun copyAssetsDirToDir(
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assetManager: AssetManager,
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assetDir: String,
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targetDir: File
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) {
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if (!targetDir.exists()) targetDir.mkdirs()
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val children = assetManager.list(assetDir) ?: return
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for (child in children) {
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val childAssetPath = "$assetDir/$child"
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val outFile = File(targetDir, child)
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val grandChildren = assetManager.list(childAssetPath)
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if (grandChildren?.isNotEmpty() == true) {
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// 子目录，递归
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copyAssetsDirToDir(assetManager, childAssetPath, outFile)
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} else {
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// 文件：如果已经存在就不覆盖；不存在才复制（补充新图）
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if (outFile.exists()) continue
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assetManager.open(childAssetPath).use { input ->
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outFile.outputStream().use { output ->
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input.copyTo(output)
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}
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}
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}
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}
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}
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// ==================== 主题初始化 / 切换 ====================
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/**
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* 初始化主题系统：
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* - 读取 SharedPreferences 中上次使用的主题名
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* - 默认使用 "default"
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* - 加载该主题的所有图片到缓存
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*/
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fun init(context: Context) {
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if (currentThemeName != null) return
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val prefs = context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE)
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val name = prefs.getString(KEY_CURRENT_THEME, "default") ?: "default"
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setCurrentTheme(context, name)
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}
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/**
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* 切换当前主题：
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* - 更新 currentThemeName
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* - 写 SharedPreferences
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* - 重新加载该主题的全部图片到缓存
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*/
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fun setCurrentTheme(context: Context, themeName: String) {
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currentThemeName = themeName
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context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE)
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.edit()
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.putString(KEY_CURRENT_THEME, themeName)
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.apply()
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drawableCache = loadThemeDrawables(context, themeName)
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}
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fun getCurrentThemeName(): String? = currentThemeName
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/**
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* 扫描某个主题目录下的所有 png/jpg/webp 文件，
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* 用“文件名（去掉扩展名，小写）”作为 keyName，构造缓存。
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*
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* 例如：
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* /.../keyboard_themes/default/key_a.png -> "key_a"
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* /.../keyboard_themes/default/key_a_up.PNG -> "key_a_up"
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*/
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private fun loadThemeDrawables(
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context: Context,
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themeName: String
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): MutableMap<String, Drawable> {
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val map = mutableMapOf<String, Drawable>()
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val dir = getThemeDir(context, themeName)
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if (!dir.exists() || !dir.isDirectory) return map
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dir.listFiles()?.forEach { file ->
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if (!file.isFile) return@forEach
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val lowerName = file.name.lowercase()
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if (
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!(lowerName.endsWith(".png") ||
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lowerName.endsWith(".jpg") ||
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lowerName.endsWith(".jpeg") ||
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lowerName.endsWith(".webp"))
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) return@forEach
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// 统一小写作为 key，比如 key_a_up.png -> "key_a_up"
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val key = lowerName.substringBeforeLast(".")
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val bmp = BitmapFactory.decodeFile(file.absolutePath) ?: return@forEach
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val d = BitmapDrawable(context.resources, bmp)
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map[key] = d
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}
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return map
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}
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// ==================== 对外：按 keyName 取 Drawable ====================
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/**
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* 根据 keyName 获取对应的 Drawable。
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*
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* keyName 一般就是 view 的 idName：
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* - "key_a"
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* - "key_a_up"
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* - "key_1"
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* - "key_space"
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* - "key_send"
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* ...
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*
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* 对应文件：
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* /Android/data/.../files/keyboard_themes/<当前主题>/key_a.png
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*
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* 内部统一用 keyName.lowercase() 做匹配，不区分大小写。
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*/
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fun getDrawableForKey(context: Context, keyName: String): Drawable? {
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if (currentThemeName == null) {
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init(context)
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}
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// 统一小写，避免大小写差异
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val norm = keyName.lowercase()
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// 1) 缓存里有就直接返回
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drawableCache[norm]?.let { return it }
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// 2) 缓存里没有：尝试从当前主题目录里单独加载一遍（兼容运行时新增图片）
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val theme = currentThemeName ?: return null
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val dir = getThemeDir(context, theme)
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val candidates = listOf(
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File(dir, "$norm.png"),
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File(dir, "$norm.webp"),
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File(dir, "$norm.jpg"),
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File(dir, "$norm.jpeg")
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)
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for (f in candidates) {
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if (f.exists() && f.isFile) {
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val bmp = BitmapFactory.decodeFile(f.absolutePath) ?: continue
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val d = BitmapDrawable(context.resources, bmp)
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drawableCache[norm] = d
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return d
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}
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}
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// 3) 找不到就返回 null（调用方自己决定是否兜底）
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return null
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}
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// ==================== 可选：列出所有已安装主题 ====================
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/**
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* 返回当前外部目录下所有已经存在的主题名列表，
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* 例如 ["default", "dark", "cute_pink"]。
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*/
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fun listAvailableThemes(context: Context): List<String> {
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val root = getThemeRootDir(context)
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if (!root.exists() || !root.isDirectory) return emptyList()
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return root.listFiles()
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?.filter { it.isDirectory }
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?.map { it.name }
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?.sorted()
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?: emptyList()
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}
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}
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