Install VeryAndroid File Protector on your Android phone.
Download VeryAndroid File Protector (a zip file) onto your computer first from our website and then unzip the file. You will see a file called FileProtector.apk. Copy it to your Android phone and install it with an app manger program such as AppInstaller.
Go to the Market (on your Android) and search for VeryAndroid File Protector. Download and install it on your phone directly.).
Run the VeryAndroid File Protector on your android and you will see this screen:
Here you can select the file/folder you want to encrypt and protect. Click the file or long click the folder and you will see this screen:
Click Encrypt File, enter your password then click "Encrypt" to continue:
Done. Now the file/folder have been encrypted and locked.
Nobody will be able to access these protected contents without your password.