Android SDCard路徑問題

列印檔案系統常用路徑：

protected void testSDCardPath() {
        mContext = this;
        log("Environment.getDataDirectory().getPath()", Environment.getDataDirectory().getPath());
        log("Environment.getDownloadCacheDirectory().getPath()", Environment.getDownloadCacheDirectory().getPath());
        log("Environment.getRootDirectory().getPath()", Environment.getRootDirectory().getPath());
        log("Environment.getExternalStorageDirectory().getPath()", Environment.getExternalStorageDirectory().getPath());
        log("Environment.getExternalStoragePublicDirectory(\"\").getPath()", Environment.getExternalStoragePublicDirectory("").getPath());
        log("Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC).getPath()", Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC).getPath());
        log("Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath()", Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath());
        log("Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath()", Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath());
        log("Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).getPath()", Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).getPath());
        log("Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath()", Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath());

        log("mContext.getFilesDir().getPath()", mContext.getFilesDir().getPath());
        log("mContext.getExternalFilesDir(Environment.DIRECTORY_MUSIC).getPath()", mContext.getExternalFilesDir(Environment.DIRECTORY_MUSIC).getPath());
        log("mContext.getExternalFilesDir(Environment.DIRECTORY_DCIM).getPath()", mContext.getExternalFilesDir(Environment.DIRECTORY_DCIM).getPath());
        log("mContext.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).getPath()", mContext.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).getPath());
        log("mContext.getExternalFilesDir(Environment.DIRECTORY_MOVIES).getPath()", mContext.getExternalFilesDir(Environment.DIRECTORY_MOVIES).getPath());
        log("mContext.getExternalFilesDir(Environment.DIRECTORY_PICTURES).getPath()", mContext.getExternalFilesDir(Environment.DIRECTORY_PICTURES).getPath());
        log("mContext.getExternalFilesDir(\"\").getPath()", mContext.getExternalFilesDir("").getPath());
        log("mContext.getCacheDir().getPath()", mContext.getCacheDir().getPath());
        log("mContext.getExternalCacheDir().getPath()", mContext.getExternalCacheDir().getPath());
    }

    private void log(String tag, String path) {
        Log.d(TAG, tag + " = " + path);
    }
           

Environment.getDataDirectory().getPath() = /data
Environment.getDownloadCacheDirectory().getPath() = /cache
Environment.getRootDirectory().getPath() = /system
Environment.getExternalStorageDirectory().getPath() = /storage/emulated/
Environment.getExternalStoragePublicDirectory("").getPath() = /storage/emulated/
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC).getPath()=/storage/emulated//Music
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath()=/storage/emulated//DCIM
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath()=/storage/emulated//Download
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).getPath()=/storage/emulated//Movies
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath()=/storage/emulated//Pictures
mContext.getFilesDir().getPath() = /data/data/com.lijunhuayc.rxjava/files
mContext.getExternalFilesDir(Environment.DIRECTORY_MUSIC).getPath()=/storage/emulated//Android/data/com.lijunhuayc.rxjava/files/Music
mContext.getExternalFilesDir(Environment.DIRECTORY_DCIM).getPath()=/storage/emulated//Android/data/com.lijunhuayc.rxjava/files/DCIM
mContext.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).getPath()=/storage/emulated//Android/data/com.lijunhuayc.rxjava/files/Download
mContext.getExternalFilesDir(Environment.DIRECTORY_MOVIES).getPath()=/storage/emulated//Android/data/com.lijunhuayc.rxjava/files/Movies
mContext.getExternalFilesDir(Environment.DIRECTORY_PICTURES).getPath()=/storage/emulated//Android/data/com.lijunhuayc.rxjava/files/Pictures
mContext.getExternalFilesDir("").getPath()=/storage/emulated//Android/data/com.lijunhuayc.rxjava/files
mContext.getCacheDir().getPath() = /data/data/com.lijunhuayc.rxjava/cache
mContext.getExternalCacheDir().getPath()=/storage/emulated//Android/data/com.lijunhuayc.rxjava/cache