I will offer you a way to meet all your security needs, including your images, on your Android device. With the way I will suggest, you will be able to prevent your files from being seen by others, as well as lock various applications. The app is called App Lock. When you download this application, I will tell you what you can do below.

What you can do with the App Lock application:

• You can lock your files such as pictures, videos, music.
• You can take control of the phone. For example, application installation or uninstallation cannot be done without the password you set.
• You can make your password a number or a pattern if you want.
• You can also add a hint so that you don’t forget your password.

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Many more things are hidden inside the application. The only flaw of the application, which is developed day by day, is that it gives too much importance to advertisements. You can use this link to install the App Lock application.