android的存儲

android的存儲分為兩種情況
1. 內存（手機端的設置進行數據清空操作為此目錄數據）（mContext.getFilesDir() data/data/package name/files 或者通過shareperference保存的數據data/data/.....）
2. 外部存儲(Environment.getExternalStorageDirectory() /storage/sdcard/.....)
外部存儲分為兩種情況
a. 永久存儲（不隨應用卸載而刪除）(/storage/sdcard/....自建存儲目錄)
b. 隨著應用的卸載而自動清除的存儲方式
mContext.getExternalCacheDir() /storage/sdcard/Android/data/package name/cache

mContext.getExternalFilesDir() /storage/sdcard/Android/data/package name/files

//查詢文件信息

11-06 05:55:55.712: I/MainActivity(12642): getRootDirectory(): /system
11-06 05:55:55.712: I/MainActivity(12642): getDataDirectory(): /data
11-06 05:55:55.722: I/MainActivity(12642): getDownloadCacheDirectory(): /cache
11-06 05:55:55.722: I/MainActivity(12642): getExternalStorageDirectory(): /mnt/sdcard
11-06 05:55:55.722: I/MainActivity(12642): getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES): /mnt/sdcard/Pictures
11-06 05:55:55.722: I/MainActivity(12642): context.getFilesDir(): /data/data/com.lmq.appprovider/files
11-06 05:55:55.722: I/MainActivity(12642): context.getCacheDir(): /data/data/com.lmq.appprovider/cache
11-06 05:55:55.722: I/MainActivity(12642): context.getExternalFilesDir(Environment.DIRECTORY_MOVIES): null
11-06 05:55:55.722: I/MainActivity(12642): context.getExternalCacheDir(): null