Android App Hangs Without Anr

Sometimes, when my app receives a new order via push, it hangs. Now the weird thing is that the System UI works fine, the app is unresponsive but the Application Not Responding dia

Solution 1:

You should observe the app behavior in the monitor. If the CPU / Memory usage is inordinately high, it could be indicative of either a memory leak or a CPU-intensive task (like an unpurged TimerTask or multiple instances of the same Runnable) that causes the app to become unresponsive without an ANR.

In case it does turn out to be a memory leak, you could investigate further with LeakCanary or monkey to further narrow down the exact cause of the leak.

I once came across an animated progress dialog that caused both a huge memory leak AND a CPU overload, causing my app to hang without throwing an exception.