如何在android中访问特定的内部存储目录？

Question

I am trying to learn android programming. As a beginning, I am trying to understand the internal file system & accessing them. Any help is highly appreciated. Following are my challenges:

1. How to create a 'TEST' folder through the android emulator/Android device monitor? I need to create the folder where the alarms, download, DCIM folder are present.

2. What is the absolute directory path to the 'TEST' folder created? Is it possible to access the TEST folder using the code below:

    List<File> list = Environment.getDataDirectory()+"/TEST".listFiles(); 

3. Does any permission to be mentioned in the manifest for read/write to internal storage?

PS: I use Android Studio.

Answer 1

You would want something along the lines of

File TEST = new File(Environment.getExternalStorageDirectory(), "TEST");
TEST.mkdir(); // make directory may want to check return value
String path = TEST.getAbsolutePath(); // get absolute path

and permissions

<manifest ...>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    ...
</manifest>

Further reference

• Android Open External Storage directory(sdcard) for storing file

• How can I get external SD card path for Android 4.0+?

• https://docs.oracle.com/javase/7/docs/api/java/io/File.html

Answer 2

File file = new File("storage/emulated/0","yourfoldername/");

如果这没有帮助，则对我有用，然后在使用

File(Environment.getobbdir(),"yourfoldername");