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Android: Random Images Shown in image view linked to matching buttons

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Hi so I am currently messing about with android/Java code. The little program I am working on randomly selects and displays an image. This works perfectly but now what I want to do is link certain images to a button.

For example if a picture of a cat is displayed from the drawable then pressing the cat button would then pick the next random image from the drawbable and like wise if a image of a dog then the dog button would be the only correct input. If the wrong button was pressed the program would go to a game over screen.

Currently I have setup the code so on start a random image if shown and upon pressing a button no matter what the image is it will load the next. Here parts of the code I have used so far:

Images in the drawable are stored as dog1,dog2,dog3.... cat1,cat2 and so on. Can any one help why the code isn't working? When I press the buttons with the if statements it crashes the app whether it is hte correct or incorrect image on the screen. From what I can work out the code is having trouble reading what is in the string to check if it starts with cat or dog.
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