OutOfMemoryError problems - android

Question

my app (memory game) is using various images. In my /drawable/ folder are about ~50 .png images with 252x252 size. My app has some levels, for example 4x3, 4x6 etc. After 3-4 games (for example, I started from 2x2 to 4x6) - my app is crashing (Unfortunately, your app has stopped). In LogCat I have these errors:

04-16 23:05:35.382: E/AndroidRuntime(13622): FATAL EXCEPTION: main
04-16 23:05:35.382: E/AndroidRuntime(13622): java.lang.OutOfMemoryError
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.graphics.Bitmap.nativeCreate(Native Method)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.graphics.Bitmap.createBitmap(Bitmap.java:605)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.graphics.Bitmap.createBitmap(Bitmap.java:551)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:437)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.graphics.BitmapFactory.finishDecode(BitmapFactory.java:530)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:505)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:357)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:777)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.content.res.Resources.loadDrawable(Resources.java:1940)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.content.res.Resources.getDrawable(Resources.java:669)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.view.View.setBackgroundResource(View.java:11861)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at com.example.testlogo.MainActivity.onCreate(MainActivity.java:145)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.app.Activity.performCreate(Activity.java:4465)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.os.Looper.loop(Looper.java:137)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at android.app.ActivityThread.main(ActivityThread.java:4448)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at java.lang.reflect.Method.invokeNative(Native Method)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at java.lang.reflect.Method.invoke(Method.java:511)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
04-16 23:05:35.382: E/AndroidRuntime(13622):    at dalvik.system.NativeStart.main(Native Method)

As I said, I am using images from /drawable/ folder. To make for example 4x3 level, I am using GridLayout and ImageButtons. I have a method, which randomizes ImageButton's place and then I am putting the image to the ImageButton, like this:

button1.setImageResource(R.drawable.logo);

For resize my ImageButton I am using:

    Display display = getWindowManager().getDefaultDisplay(); 
        int screenwidth = display.getWidth();
        int screenheight = display.getHeight(); 
            button.setMaxHeight(screenwidth/3);
            button.setMaxWidth(screenwidth/3);

So I do not really know, how to manage with my problem. Maybe should I use Bitmap instead of ImageResource?

Note: 1)Every level have own class, they are very similar to each other.

2)Every level class have 24 images. If the level is 4x3 I will get first random 6 pics.

3)Every activity are using finish(); method if the activity is closed/onBackPressed.

int[] img ={R.drawable.cherry90,R.drawable.apple90,R.drawable.applered90,R.drawable.apricot90,R.drawable.banana90,R.drawable.blueberry90,


R.drawable.coconut90,R.drawable.gooseberry90,R.drawable.grape90,R.drawable.grapefruit90,R.drawable.kiwi90,R.drawable.lemon90,
                R.drawable.lime90,R.drawable.mandarin90,R.drawable.mango90,R.drawable.melon,R.drawable.papaya90,R.drawable.peach90,
                R.drawable.pears90,R.drawable.pineapple,R.drawable.plums90,R.drawable.pomegranate90,R.drawable.raspberry90,R.drawable.strawberry90};

I hope you will understand what I wanted to say. I were searching an answer to this problem, but did not find.

Answer 1

Basically it an error that indicates you have used excess of your ram memory allocations, there is nothing wrong in your code it just needs to be optimized. Here are a few ways to do this:

• Reduce the resolution of the images, you can still stretch them to the same size, but they wont show in as much detail.
• Delete or re-use image variable space.
• If you show the same image multiple times on the screen, like with most tiled maps. only create one variable where the image is stored.

Remember variables mean ram.