ANR (Application Not Responding) error

[shepeliev]

We are using the BlueParrot Android SDK in one of our projects and recently encountered multiple ANR (Application Not Responding) reports related to the SDK’s code:

Unfortunately, the lib code is obfuscated, but I can see the potential problem. Here is a decompiled code fragment:

    private void a(int var1) {
        long var2 = System.currentTimeMillis();
        boolean var4 = false;

        while(!var4 && System.currentTimeMillis() - var2 < 8000L) {
            BluetoothAdapter var5;
            if ((var5 = BluetoothAdapter.getDefaultAdapter()) != null) {
                if (2 == var5.getProfileConnectionState(1)) {
                    var4 = true;
                } else {
                    var4 = false;
                }
            }

            if (!var4) {
                try {
                    Thread.sleep(100L);
                } catch (InterruptedException var6) {
                    var6.printStackTrace();
                }
            }
        }

        // the rest of code 

    }

This function contains a blocking Thread.sleep() call within a loop, which can potentially block the calling thread for up to 8 seconds.

The issue arises because this blocking function is invoked from the main thread, as shown below:

(new Handler(Looper.getMainLooper())).postDelayed(new Runnable() {
                public void run() {
                    BPHeadsetImpl.this.a(var1);
                }
            }, 1L);

This causes the main thread may be blocked for up to 8 seconds while waiting for the Bluetooth adapter to become available, resulting in an ANR.

[shepeliev]

@alanslattery, @alanjslattery, @gna-sw any chance this issue will be fixed?