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copied!<p>since it's usually impractical to load all bitmaps into memory for Android, you should assume that you will get GC from time to time.</p> <p>however, what you can do it consider the next tips:</p> <ol> <li><p>downscale the bitmaps to the sizes you need to show them. you can use <a href="http://developer.android.com/training/displaying-bitmaps/index.html" rel="nofollow noreferrer"><strong>google's way</strong></a> or <a href="https://stackoverflow.com/a/17773344/878126"><strong>my way</strong></a>.</p></li> <li><p>check in which folder you've put the image files. many people put them in the res/drawable folder and don't understand why they get to be so much larger than their original sizes (it's because of the density - it's mdpi while the device is probably xhdpi or xxhdpi). </p> <p>for example, if an image is in the drawable folder and you run it on an xhdpi device (like the galaxy S3), it would take (WIDTH*2)*(HEIGHT*2)*4 bytes . if the image is 200x200 , its bitmap object would take at least 400*400*4=640,000 bytes . it would be even worse on an xxhdpi device , like the galaxy s4 and htc one . </p></li> <li><p>consider using a memory cache, like the <a href="http://developer.android.com/reference/android/util/LruCache.html" rel="nofollow noreferrer"><strong>LruCache</strong></a></p></li> <li><p>if the bitmaps do not have transparency, and you don't see any difference in quality, consider using the <a href="http://developer.android.com/reference/android/graphics/Bitmap.Config.html" rel="nofollow noreferrer"><strong>RGB_565 config</strong></a> instead of default one. this will take 2 bytes per pixel instead of 4 bytes per pixel.</p></li> <li><p>if you can be responsible enough, you can use JNI for the caching. i've made a small code for this task, <a href="https://stackoverflow.com/questions/18250951/jni-bitmap-operations-for-helping-to-avoid-oom"><strong>here</strong></a> . please read all of the notes i've written there.</p></li> </ol> <p>btw, i've noticed you used an array of identifiers for the images. if the images have some logic in their names (example : img1,img2,...), you could use getResources().getIdentifier(...) instead. </p>

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