I. briefly

In Android development, you often need to operate files. You have been unclear about the corresponding relationship between api and file path. Today, you have time to sort out the records so as not to forget them later.

2, Start testing

First look at the following code

getFilesDir();
getExternalCacheDir();
getPackageCodePath();
getPackageResourcePath();
getCacheDir();
getExternalFilesDir(null);

Environment.getExternalStorageState();
Environment.getExternalStorageDirectory();
Environment.getDataDirectory();
Environment.getDownloadCacheDirectory();
Environment.getRootDirectory();
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);

The paths corresponding to the above tests are:

Through the above observation, it can be found that there are several api models that are slightly different. The customized system of domestic manufacturers has been modified correspondingly. When using it, it is still necessary to be careful to prevent "dropping pit".

Here, Tucao CSDN picture is too bad, the picture format is not good enough to adjust.

Environment.getDataDirectory() = 
    /data
Environment.getDownloadCacheDirectory() = 
    /data/cache    (vivo)
    /cache        (meizu)
Environment.getExternalStorageDirectory() = 
    /storage/emulated/0
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) =                                 
     /storage/emulated/0/Pictures
Environment.getRootDirectory() = 
    /system
getPackageCodePath() = 
    /data/app/com.demo.mydemoapplication-1/base.apk
getPackageResourcePath() = 
    /data/app/com.demo.mydemoapplication-1/base.apk
getCacheDir() = 
    /data/data/com.demo.mydemoapplication/cache    (meizu)
    /data/user/0/com.demo.mydemoapplication/cache    (vivo)
getDatabasePath("test") = 
    /data/data/com.demo.mydemoapplication/databases/test
getDir("test", Context.MODE_PRIVATE) =     
    /data/data/com.demo.mydemoapplication/app_test
getExternalCacheDir() =     
    /storage/emulated/0/Android/data/com.demo.mydemoapplication/cache
getExternalFilesDir("test") = 
    /storage/emulated/0/Android/data/com.demo.mydemoapplication/files/test
getExternalFilesDir(null) = 
    /storage/emulated/0/Android/data/com.demo.mydemoapplication/files
getFilesDir() = 
    /data/data/com.demo.mydemoapplication/files    (meizu)
    /data/user/0/com.demo.mydemoapplication/files    (vivo)