How to find out IDs or names of preloaded system drawables (bitmaps) from memory dump

Question

I\'m analyzing memory usage of our app, and has found strange Drawables, which constantly \"eats\" few megabytes of heap. Here are few screenshots from MAT:

Answer 1

The preloaded drawables are loaded by Zygote.

ZygoteInit#preloadResources()

    /**
 * Load in commonly used resources, so they can be shared across
 * processes.
 *
 * These tend to be a few Kbytes, but are frequently in the 20-40K
 * range, and occasionally even larger.
 */
private static void preloadResources() {
    final VMRuntime runtime = VMRuntime.getRuntime();

    try {
        mResources = Resources.getSystem();
        mResources.startPreloading();
        if (PRELOAD_RESOURCES) {
            Log.i(TAG, "Preloading resources...");

            long startTime = SystemClock.uptimeMillis();
            TypedArray ar = mResources.obtainTypedArray(
                    com.android.internal.R.array.preloaded_drawables);
            int N = preloadDrawables(runtime, ar);
            ar.recycle();
            Log.i(TAG, "...preloaded " + N + " resources in "
                    + (SystemClock.uptimeMillis()-startTime) + "ms.");


            startTime = SystemClock.uptimeMillis();
            ar = mResources.obtainTypedArray(
                    com.android.internal.R.array.preloaded_color_state_lists);
            N = preloadColorStateLists(runtime, ar);
            ar.recycle();
            Log.i(TAG, "...preloaded " + N + " resources in "
                    + (SystemClock.uptimeMillis()-startTime) + "ms.");
        }
        mResources.finishPreloading();
    } catch (RuntimeException e) {
        Log.w(TAG, "Failure preloading resources", e);
    }
}

You see, the preloaded drawables are com.android.internal.R.array.preloaded_drawables