Android starts to kill apps only when available memory is lower than threshold?
<p>As we know, when the memory becomes low, Android may start to kill some background apps to free memory. E.g. Nexus 7, this low-memory threshold is 64MB.</p>

<p>However, I observed that, even the available memory was enough (e.g. 150MB) to launch a new app (e.g. AngryBirds with 30MB), still the Android might kill some background apps. Is this possible?</p>

<p>If so, then what are the other "conditions" in which the Android "killer" would be also invoked?</p>
