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10 APP DATA & FILE (4 loai SHARE (Share simple_data (send (mo 1…

- - - - Create a file
        
        file = createTempFile() tao trong Cachedir
        
        file =new file (dir, file)
        
        dir
        
        getCacheDir()
        
        getFilesDir()
        
        outputStream =openFileOutput(filename,Context.MODE_PRIVATE);
      - open
        
        file
        
        openFileInput(name)
        
        dir
        
        getFilesDir()
        
        getDir(name, mode)
        
        getCacheDir()
    - - request storage permissions and verify that storage is available
      - getExternalStoragePublicDirectory() ->public file
      - getExternalFilesDir() -> private file
    - - myFile.delete();
      - myContext.deleteFile(fileName); - chi o che do internal storage
- - - - mo 1 activity + action + infor => lua chon app
    - - dinh nghia <intent-filter> cua app