在android中加密解密

Question

I am new in android.I want to encrypt a file and I want to decrypt it an show it in a image view can anyone help me. I have no idea about the encryption and decryption.

Answer 1

If you have a File of the file on the SD card , you can read it into a byte[] , and do realImageContents = decrypt(fileContents) for some function decrypt() . Then you can get a Bitmap object using BitmapFactory and pass that to ImageView.setImageBitmap() .

Look at javax.crypto for using actual encryption algorithms. If you just want to obfuscate the image, you could just write your own encrypt() / decrypt() that does something simple like an XOR cipher with the key hard-coded in your application.