How do I check the heap memory size of my application on Android?

Memory capacity varies by Android version and device model.

public static void logHeap() {
        Double allocated = new Double(Debug.getNativeHeapAllocatedSize())/new Double((1024*1024));
        Double available = new Double(Debug.getNativeHeapSize())/(1024*1024.0);
        Double free = new Double(Debug.getNativeHeapFreeSize())/(1024*1024.0);
        DecimalFormat df = new DecimalFormat();
        df.setMaximumFractionDigits(2);
        df.setMinimumFractionDigits(2);

        Log.d("tag", "debug. ===Heap====Heap======Heap====Heap====Heap=====");
        Log.d("tag", "debug.heap native: allocated " + df.format(allocated) + "MB of " + df.format(available) + "MB (" + df.format(free) + "MB free)");
        Log.d("tag", "debug.memory: allocated: " + df.format(new Double(Runtime.getRuntime().totalMemory()/(1024*1024.0))) + "MB of " + df.format(new Double(Runtime.getRuntime().maxMemory()/(1024*1024.0)))+ "MB (" + df.format(new Double(Runtime.getRuntime().freeMemory()/(1024*1024.0))) +"MB free)");
    }