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    <p>I'm sorry that the answer of this question wasn't actually possible to have with the elements I gave in my question.</p> <p>Indeed, as mentioned in another question here: <a href="https://stackoverflow.com/questions/9626270/why-are-all-my-bitmaps-upsampled-200">Why are all my bitmaps upsampled 200%?</a>, I put my pictures in the <code>drawable</code> folder, which, on a xhdpi screen like mine, will cause Android to upsample everything twice (to match xhdpi against mdpi), and will result in a 400% memory usage (twice the width and twice the height so 4 times as many pixels).</p> <p>One more thing, since I don't want the user to be able to go back (see the <code>finish()</code> right after the <code>startActivity()</code>), here's what I put in the <code>onPause()</code>:</p> <pre><code>private void unbindDrawables(View view) { if (view.getBackground() != null) { view.getBackground().setCallback(null); } if (view instanceof ViewGroup) { for (int i = 0; i &lt; ((ViewGroup) view).getChildCount(); i++) { unbindDrawables(((ViewGroup) view).getChildAt(i)); } ((ViewGroup) view).removeAllViews(); } } </code></pre> <p>This is some code I got here on StackOverflow (for example here: <a href="https://stackoverflow.com/questions/7044770/drawable-vs-single-reusable-bitmap-better-with-memory">Drawable vs Single reusable Bitmap better with memory?</a>).</p> <p>Here are my remarks about this code and why every line is important:</p> <ul> <li>The <code>setCallback(null)</code> removes the reference to the activity, so that it can be garbage collected. If you don't do this, all the views will stay in memory.</li> <li>You also need to call it from <code>onPause</code>, because <code>onDestroy</code> is not guaranteed to be called.</li> <li>You may need to cause a garbage collection after this, in order to help the GC understand that some references to objects that were made orphans and that can be GC'd. Just call <code>System.gc()</code>.</li> </ul> <p>This is the resulting <code>onPause</code> code, with the main layout of your activity having the id <code>top_layout</code>:</p> <pre><code>@Override protected void onPause() { super.onPause(); unbindDrawables(findViewById(R.id.top_layout)); System.gc(); } </code></pre>
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