怎么使用原生 Android 版本的 Emacs: Difference between revisions

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== 文件夹 ==
== 文件夹 ==
怎么让安卓版本的 Emacs 访问你的安卓里的文件夹呢？
怎么让原生安卓版本的 Emacs 访问你的安卓里的文件夹呢？
<syntaxhighlight lang="elisp">
<syntaxhighlight lang="elisp">
# 授予管理所有文件的权限
# 授予管理所有文件的权限
Line 34: Line 34:
</syntaxhighlight>
</syntaxhighlight>


== 设置工作目录 ==
== 字体 ==
<syntaxhighlight lang="elisp">
怎么让原生安卓版本的 Emacs 识别并正常显示中文字体，而不是 16 进制的字符块呢？
(setq default-directory "/sdcard/Emacs/")
 
</syntaxhighlight>
首先，去下载某个字体。


其次，把它复制进原生安卓版本的 Emacs 的私有目录下的 fonts 文件夹。
<syntaxhighlight lang="elisp">
<syntaxhighlight lang="elisp">
M-x setenv RET HOME RET /sdcard/Emacs
M-x mkdir RET fonts
M-x copy-file RET /sdcard/Downloads/NotoSansSC-Regular.ttf RET ~/fonts/NotoSansSC-Regular.ttf RET
</syntaxhighlight>
</syntaxhighlight>


再次，验证 Emacs 是否看到了你复制进去的字体。
<syntaxhighlight lang="elisp">
<syntaxhighlight lang="elisp">
;; ======== 固定 new-file 目录为 /storage/sdcard0/Emacs/ =========
(insert
(defvar my-android-emacs-dir "/storage/sdcard0/Emacs/"
"\n"
  "默认用于新建文件和文件选择的目录（Android）。")
(mapconcat
 
  #'identity
(setq-default default-directory (expand-file-name my-android-emacs-dir))
  (seq-filter (lambda (font)
 
                 (or (string-match-p "SC" font)
(add-hook 'emacs-startup-hook
                    (string-match-p "wqy" font)
          (lambda ()
                    (string-match-p "WenQuanYi" font)))
            (let ((d (expand-file-name my-android-emacs-dir)))
              (font-family-list))
              (dolist (buf (buffer-list))
  "\n")
                 (with-current-buffer buf
"\n")
                  (setq default-directory d))))))
 
(defun my-android-find-file-minibuffer-setup ()
  (when (memq this-command '(find-file find-file-other-window))
    (setq default-directory (expand-file-name my-android-emacs-dir))))
(add-hook 'minibuffer-setup-hook #'my-android-find-file-minibuffer-setup)
 
;; 强力：为 read-file-name 提供默认目录（覆盖大多数 UI 框架）
(defun my-android-read-file-name-wrapper (orig prompt &optional dir default-filename mustmatch initial)
  (let ((dir (or dir (expand-file-name my-android-emacs-dir))))
    (apply orig prompt dir default-filename mustmatch initial)))
(advice-add 'read-file-name :around #'my-android-read-file-name-wrapper)
 
;; 权限检查命令
(defun my-android-ensure-emacs-dir-access ()
  (interactive)
  (let ((d (expand-file-name my-android-emacs-dir)))
    (if (file-directory-p d)
        (message "目录可访问：%s" d)
      (if (fboundp 'android-request-directory-access)
          (message "请运行 M-x android-request-directory-access 并选择 %s 以授权。" d)
        (message "目录不可访问：%s。请在 系统 -> 应用 -> 特殊应用访问 -> All files access 打开 Emacs 并授予“文件与媒体”权限。" d)))))
(global-set-key (kbd "C-c e d") #'my-android-ensure-emacs-dir-access)
;; ================================================================


</syntaxhighlight>
</syntaxhighlight>
== 字体 ==
怎么让原生安卓版本的 Emacs 识别并正常显示中文字体，而不是 16 进制的字符块呢？
首先，去下载某个字体。
其次，把它复制进原生安卓版本的 Emacs 的工作目录下的 fonts 文件夹。


最后，在 ~/.emacs.d/init.el 里调用该字体。
最后，在 ~/.emacs.d/init.el 里调用该字体。
Line 95: Line 67:
(set-language-environment "UTF-8")
(set-language-environment "UTF-8")


(set-face-attribute 'default nil :height 300)
;; 因为屏幕素质不同，字体设计时字高不同，emacs 也不一定按屏幕真实 DPI 来渲染
(set-fontset-font t 'han "Noto Sans SC:pixelsize=50")
;; 所以追求数学上相近的比如都 30pt 没用
</syntaxhighlight>
;; 得看不同屏幕上的实际观感来确定中英文的不同 pt
 
(set-face-attribute 'default nil :height 240) ;; 单位 1/10 pt
 
(set-fontset-font t 'han (font-spec :family "Noto Sans SC" :size 40)) ;; 单位 1 pt
私有目录，一般是 /data/data/org.gnu.emacs/files/fonts。
<syntaxhighlight lang="elisp">
M-x copy-file RET /sdcard/Downloads/NotoSansSC-Regular.ttf RET ~/fonts/NotoSansSC-Regular.ttf RET
</syntaxhighlight>
</syntaxhighlight>


 
== 美化 ==
== debug ==
<syntaxhighlight lang="elisp">
<syntaxhighlight lang="elisp">
;; 把整段粘进 *scratch* 并评估，或放到 init.el
(setq inhibit-startup-message t)
(require 'cl-lib)
(setq make-backup-files nil)   ;; 禁止生成 xxx~
 
(setq auto-save-default nil)   ;; 禁止生成 #xxx#
(defun my-android-debug-info ()
(setq create-lockfiles nil)
  "Gather Android/`default-directory' debug info and show it in *emacs-android-debug* buffer.
Run `M-x my-android-debug-info' and copy the buffer content to paste here."
  (interactive)
  (let* ((buf (get-buffer-create "*emacs-android-debug*"))
        (dir (if (and (boundp 'my-android-emacs-dir) my-android-emacs-dir)
                  (expand-file-name my-android-emacs-dir)
                "/storage/sdcard0/Emacs/")))
    (with-current-buffer buf
      (setq buffer-read-only nil)
      (erase-buffer)
      (insert (format "===== emacs-android-debug (timestamp: %s) =====\n\n"
                      (current-time-string)))
 
      ;; basic vars
      (insert (format "my-android-emacs-dir bound: %s\n"
                      (if (boundp 'my-android-emacs-dir) "yes" "no")))
      (when (boundp 'my-android-emacs-dir)
        (insert (format "my-android-emacs-dir value: %s\n" my-android-emacs-dir)))
      (insert (format "resolved my-android-emacs-dir: %s\n\n" dir))
 
      ;; env
      (insert "=== Environment ===\n")
      (dolist (v '("HOME" "ANDROID_DATA" "EXTERNAL_STORAGE" "EMACS"))
        (insert (format "%-18s = %s\n" v (or (getenv v) ""))))
      (insert "\n")
 
      ;; home/dirs and current
      (insert "=== Home / Directories ===\n")
      (insert (format "getenv \"HOME\": %s\n" (or (getenv "HOME") "")))
      (insert (format "expand-file-name \"~\": %s\n" (expand-file-name "~")))
      (insert (format "default-directory (current buffer): %s\n\n" default-directory))
 
      ;; hooks and minibuffer
      (insert "=== Minibuffer & Hooks ===\n")
      (insert (format "minibuffer-setup-hook length: %d\n" (length minibuffer-setup-hook)))
      (insert (format "emacs-startup-hook length: %d\n" (length emacs-startup-hook)))
      (insert (format "my-android-find-file-minibuffer-setup present in minibuffer-setup-hook?: %s\n"
                      (if (memq #'my-android-find-file-minibuffer-setup minibuffer-setup-hook) "yes" "no")))
      (insert "\n")
 
      ;; buffers
      (insert "=== Buffers and their default-directory ===\n")
      (dolist (b (buffer-list))
        (with-current-buffer b
          (insert (format "%-30s -> %s\n" (buffer-name b) default-directory))))
      (insert "\n")
 
      ;; features commonly related to file UIs
      (insert "=== Common UI features loaded ===\n")
      (dolist (f '(ivy helm vertico counsel selectrum))
        (insert (format "%-10s : %s\n" f (if (featurep f) "loaded" "not loaded"))))
      (insert "\n")
 
      ;; read-file-name info
      (insert "=== read-file-name / advice info ===\n")
      (insert (format "read-file-name-function: %s\n" read-file-name-function))
      (insert (format "symbol property 'advice on read-file-name: %s\n"
                      (if (get 'read-file-name 'advice) "present" "none")))
      (insert (format "symbol-function of read-file-name: %s\n\n" (symbol-function 'read-file-name)))


      ;; filesystem checks
(menu-bar-mode -1)
      (insert "=== Filesystem checks for resolved my-android-emacs-dir ===\n")
(tool-bar-mode -1)
      (insert (format "file-exists-p: %s\n" (file-exists-p dir)))
(scroll-bar-mode -1)
      (insert (format "file-directory-p: %s\n" (file-directory-p dir)))
      (insert "directory-files (attempt, up to first 20 entries):\n")
      (condition-case err
          (let ((lst (directory-files dir nil nil t)))
            (insert (format "  total entries: %d\n" (length lst)))
            (dolist (e (cl-subseq lst 0 (min 20 (length lst))))
              (insert (format "    %s\n" e))))
        (error (insert (format "  ERROR listing directory: %s\n" err))))
      (insert "\n")


      ;; android helpers
(global-auto-revert-mode t)
      (insert "=== Android helper functions availability ===\n")
(setq suggest-key-bindings 10) ;十秒后建议才消失
      (insert (format "android-request-directory-access fboundp: %s\n"
                      (if (fboundp 'android-request-directory-access) "yes" "no")))
      (insert (format "android-request-storage-access fboundp: %s\n"
                      (if (fboundp 'android-request-storage-access) "yes" "no")))
      (insert "\n")


      (insert "===== End of report =====\n")
(add-hook 'dired-mode-hook  'dired-hide-details-mode t)
      (goto-char (point-min))
(defalias 'yes-or-no-p 'y-or-n-p)
      ;; make read-only for safety and show it
      (view-mode 1)
      (display-buffer buf))))


;; 之前我一直在纠结 Emacs 处理安卓公开目录如 /storage/sdcard0/Emacs 时会导致 Find file 有长长的路径。洗把脸发现嫌弃路径长我自己写个短路径不就行了吗
(setq initial-buffer-choice (lambda () (dired "/sdcard/a/")))
</syntaxhighlight>
</syntaxhighlight>

Latest revision as of 00:52, 3 October 2025

原生安卓版本的 Emacs，令安卓上的编程出现了很大的想象力。或许未来，在安卓上编程，会成为更方便的事情。以前，大家都绕道，用 Termux 安装 Emacs，终究是隔了一层。现在，gnu 本身发布了原生安卓版本的 Emacs，可以从 FDroid 分流下载。但是安装后，你会发现你遇到了重重难题。

不迷路

怎么让自己不迷路，知道自己在哪里？ 

# 查看 HOME 环境变量
M-: (getenv "HOME")
# 示例输出："/data/data/org.gnu.emacs/files"

# 查看 ~ 的展开路径
M-: (expand-file-name "~")
# 示例输出："/data/data/org.gnu.emacs/files"

# 查看工作起始目录
M-: default-directory
# 示例输出："~/"

# M-: 运行命令
# 注意 default 别写成 defualt
# 评估变量不用括号
# 调用函数要括号
# 输出就算一样，也是各有所用，并不重复
# 可以单独设置

文件夹

怎么让原生安卓版本的 Emacs 访问你的安卓里的文件夹呢？ 

# 授予管理所有文件的权限
M-x android-request-storage-access

# 授予管理某个文件夹的权限
M-x android-request-directory-access

字体

怎么让原生安卓版本的 Emacs 识别并正常显示中文字体，而不是 16 进制的字符块呢？

首先，去下载某个字体。

其次，把它复制进原生安卓版本的 Emacs 的私有目录下的 fonts 文件夹。 

M-x mkdir RET fonts
M-x copy-file RET /sdcard/Downloads/NotoSansSC-Regular.ttf RET ~/fonts/NotoSansSC-Regular.ttf RET

再次，验证 Emacs 是否看到了你复制进去的字体。 

(insert
 "\n"
 (mapconcat
  #'identity
  (seq-filter (lambda (font)
                (or (string-match-p "SC" font)
                    (string-match-p "wqy" font)
                    (string-match-p "WenQuanYi" font)))
              (font-family-list))
  "\n")
 "\n")

最后，在 ~/.emacs.d/init.el 里调用该字体。 

(prefer-coding-system 'utf-8)
(set-default-coding-systems 'utf-8-unix)
(set-language-environment "UTF-8")

;; 因为屏幕素质不同，字体设计时字高不同，emacs 也不一定按屏幕真实 DPI 来渲染
;; 所以追求数学上相近的比如都 30pt 没用
;; 得看不同屏幕上的实际观感来确定中英文的不同 pt
(set-face-attribute 'default nil :height 240) ;; 单位 1/10 pt
(set-fontset-font t 'han (font-spec :family "Noto Sans SC" :size 40)) ;; 单位 1 pt

美化

(setq inhibit-startup-message t)
(setq make-backup-files nil)   ;; 禁止生成 xxx~
(setq auto-save-default nil)   ;; 禁止生成 #xxx#
(setq create-lockfiles nil)

(menu-bar-mode -1)
(tool-bar-mode -1)
(scroll-bar-mode -1)

(global-auto-revert-mode t)
(setq suggest-key-bindings 10) ;十秒后建议才消失

(add-hook 'dired-mode-hook  'dired-hide-details-mode t)
(defalias 'yes-or-no-p 'y-or-n-p)

;; 之前我一直在纠结 Emacs 处理安卓公开目录如 /storage/sdcard0/Emacs 时会导致 Find file 有长长的路径。洗把脸发现嫌弃路径长我自己写个短路径不就行了吗
(setq initial-buffer-choice (lambda () (dired "/sdcard/a/")))
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