android - How click Next Button and Back Button in array index -


i'm creating app on android viewing image when select next button show new image , button show previous image when press next button maximum index , want show start first image index , when press button minimum index, want show start maxminum image index. have problem when click button go 0 index want show image final index , when click next button go final index want show 0 index. * 

    if (v == btn_back) {         if((currentimageindex)!=0){             imageview.setimageresource(image_ids[currentimageindex]);                mp = mediaplayer.create(this, mymusic[currentsoundindex]);                mp.start();               --currentimageindex;               --currentsoundindex;            }           if((currentimageindex)==0){                     imageview.setimageresource(image_ids[currentimageindex]);                        mp = mediaplayer.create(this, mymusic[currentsoundindex]);                        mp.start();               --currentimageindex;               --currentsoundindex;}     if(v== btn next){*******}

replace --currentimageindex with:

currentimageindex = (currentimageindex + image_ids.length -1) % image_ids.length;

when index 0 make wrap around image_ids.length-1.

note, going forward need this:

currentimageindex = (currentimageindex + 1) % image_ids.length;

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