{"id":892,"date":"2015-07-16T11:19:04","date_gmt":"2015-07-16T03:19:04","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=892"},"modified":"2026-08-18T12:58:42","modified_gmt":"2026-08-18T04:58:42","slug":"android%e6%96%87%e4%bb%b6%e5%ad%98%e5%82%a8","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=892","title":{"rendered":"Android\u6587\u4ef6\u5b58\u50a8"},"content":{"rendered":"
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\u7535\u8111\u6587\u4ef6\u5728\u786c\u76d8\u5206\u533a\u4e0a\u3002Android \u5219\u5206\u6210\u5185\u90e8\u5b58\u50a8 internal<\/strong>\u548c\u5916\u90e8\u5b58\u50a8 external<\/strong>\u3002\u65e9\u671f\u591a\u6570\u673a\u5668\u5185\u7f6e\u4e0d\u53ef\u5378\u8f7d\u5185\u5b58\uff0c\u518d\u52a0\u4e00\u5f20\u53ef\u5378 SD \u5361\uff1b\u540e\u6765\u4e0d\u5c11\u673a\u578b\u628a\u4e24\u5757\u90fd\u505a\u6210\u5185\u7f6e\u4e0d\u53ef\u5378\uff0c\u4f46\u903b\u8f91\u4e0a\u4ecd\u6309 internal \/ external \u5212\u5206\uff0c\u4e0d\u518d\u7528\u300c\u80fd\u4e0d\u80fd\u62d4\u5361\u300d\u5f53\u6807\u51c6\u3002<\/p>\n<\/blockquote>\n

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\u4e00\u3001\u5185\u90e8\u5b58\u50a8 vs \u5916\u90e8\u5b58\u50a8<\/span><\/h2>\n\n\n\n\n\n\n\n\n
\u5bf9\u6bd4<\/th>\nInternal<\/th>\nExternal<\/th>\n<\/tr>\n<\/thead>\n
\u53ef\u7528\u6027<\/td>\n\u603b\u662f\u53ef\u7528<\/td>\n\u4e0d\u4e00\u5b9a\uff0cUSB \u5927\u5bb9\u91cf\u6a21\u5f0f\u65f6\u53ef\u80fd\u8bbf\u95ee\u4e0d\u5230<\/td>\n<\/tr>\n
\u6743\u9650<\/td>\n\u9ed8\u8ba4\u53ea\u6709\u672c app \u80fd\u8bbf\u95ee<\/td>\n\u5927\u5bb6\u90fd\u80fd\u8bbf\u95ee\uff0c\u6ca1\u6709\u8bbf\u95ee\u63a7\u5236<\/td>\n<\/tr>\n
\u5378\u8f7d app<\/td>\n\u76f8\u5173\u6587\u4ef6\u5168\u90e8\u6e05\u6389<\/td>\n\u53ea\u5220 getExternalFilesDir()<\/code> \u4e0b\u7684\u79c1\u6709\u6587\u4ef6<\/td>\n<\/tr>\n
\u9002\u5408<\/td>\n\u4e0d\u60f3\u88ab\u7528\u6237\/\u5176\u5b83 app \u78b0\u5230\u7684\u6570\u636e<\/td>\n\u8981\u5171\u4eab\u3001\u6216\u5141\u8bb8\u7528\u7535\u8111\u62f7\u8d70\u7684\u6587\u4ef6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Tip\uff1aapp \u9ed8\u8ba4\u88c5\u5230 internal\u3002\u53ef\u5728 manifest \u58f0\u660e android:installLocation<\/code>\uff0c\u5141\u8bb8\u88c5\u5230\u5916\u90e8\u5b58\u50a8\uff08\u5b89\u88c5\u5305\u5f88\u5927\u65f6\u7528\u6237\u66f4\u613f\u610f\u6709\u8fd9\u4e2a\u9009\u9879\uff09\u3002\u8bfb\u5199\u5916\u90e8\u5b58\u50a8\u8981\u6743\u9650\uff1a<\/p>\n

<manifest ...>\n    <uses-permission android:name=\"android.permission.WRITE_EXTERNAL_STORAGE\" \/>\n    <uses-permission android:name=\"android.permission.READ_EXTERNAL_STORAGE\" \/>\n    ...\n<\/manifest><\/code><\/pre>\n
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\u4e8c\u3001\u4fdd\u5b58\u5230\u5185\u90e8\u5b58\u50a8<\/span><\/h2>\n
\u62ff\u76ee\u5f55\uff1agetFilesDir()<\/code> \u2192 \/data\/data\/com.example.android\/files\/<\/code>\uff1bgetCacheDir()<\/code> \u2192 \/data\/data\/com.example.android\/cache\/<\/code>\u3002<\/p>\n
File file = new File(getFilesDir(), filename);\n\nFileOutputStream os;\ntry {\n    os = new FileOutputStream(file);\n    os.write(string.getBytes());\n    os.close();\n} catch (FileNotFoundException e) {\n    e.printStackTrace();\n} catch (IOException e) {\n    e.printStackTrace();\n}<\/code><\/pre>\n
\u4e5f\u53ef\u4ee5 openFileOutput()<\/code> \u76f4\u63a5\u62ff\u6d41\u5199\u5230 internal\uff1a<\/p>\n
String filename = \"myfile\";\nString string = \"Hello world!\";\nFileOutputStream outputStream;\n\ntry {\n  outputStream = openFileOutput(filename, Context.MODE_PRIVATE);\n  outputStream.write(string.getBytes());\n  outputStream.close();\n} catch (Exception e) {\n  e.printStackTrace();\n}<\/code><\/pre>\n
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\u4e09\u3001\u4fdd\u5b58\u5230\u5916\u90e8\u5b58\u50a8<\/span><\/h2>\n
\u8bfb\u5199\u524d\u5148\u68c0\u67e5\u662f\u5426\u53ef\u7528\uff1a<\/p>\n
private boolean isExternalStorageWritable() {\n    String state = Environment.getExternalStorageState();\n    if (state.equals(Environment.MEDIA_MOUNTED)) {\n        return true;\n    } else {\n        return false;\n    }\n}<\/code><\/pre>\n
\u5916\u90e8\u518d\u5206\u516c\u5171\u533a public<\/strong>\u548c\u79c1\u6709\u533a private<\/strong>\u3002\u516c\u5171\u6587\u4ef6\u5bf9\u7528\u6237\u548c\u5176\u5b83 app \u53ef\u89c1\uff0c\u5378\u8f7d\u672c app \u4e5f\u5e94\u4fdd\u7559\uff08\u62cd\u7167\u3001\u4e0b\u8f7d\uff09\u3002\u79c1\u6709\u6587\u4ef6\u5f52\u672c app\uff0c\u5378\u8f7d\u65f6\u7cfb\u7edf\u4f1a\u5220\u6389 private \u76ee\u5f55\uff08\u4f8b\u5982\u7f13\u5b58\uff09\uff1b\u6280\u672f\u4e0a\u522b\u4eba\u4e5f\u80fd\u8bfb\uff0c\u4f46\u5bf9\u522b\u4eba\u901a\u5e38\u6ca1\u610f\u4e49\u3002<\/p>\n
\u516c\u5171\u533a\u7528 getExternalStoragePublicDirectory()<\/code>\uff0c\u53c2\u6570\u6307\u5b9a\u7c7b\u578b\uff08\u5982 DIRECTORY_MUSIC<\/code>\u3001DIRECTORY_PICTURES<\/code>\uff09\uff1a<\/p>\n
public File getPictureStorageDir(String pictureName) {\n    File file = new File(Environment.getExternalStoragePublicDirectory(\n            Environment.DIRECTORY_PICTURES), pictureName);\n    if (!file.mkdirs()) {\n        Log.e(LOG_TAG, \"Directory not created\");\n    }\n    return file;\n}<\/code><\/pre>\n
DIRECTORY_PICTURES<\/code> \u5bf9\u5e94 mnt\/sdcard\/Pictures<\/code>\u3002\u5176\u5b83\u6807\u51c6\u76ee\u5f55\uff1a<\/p>\n