Android: Fix crash in QBluetoothDeviceDiscoveryAgent ctor due to Java exception

In general BluetoothAdapter.getDefaultAdapter should not throw an exception.
If the device does not support Bluetooth the function should return a
null reference only.

However some devices throw a RuntimeException as well. Specially the
smartphone HTC 10! Even that phone supports Bluetooth.

So we need to catch it to prevent unwinding of the stack.
This fix is a sibling of 669b427653f8f708269431917f720f7e76680191.

Task-number: QTBUG-45066
Change-Id: I6d5f71e5cc988eed02ae35665b6ef6c9e8769868
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/bluetooth/qbluetoothdevicediscoveryagent_android.cpp b/src/bluetooth/qbluetoothdevicediscoveryagent_android.cpp
index e20fa723..2c2d41c9 100644
--- a/src/bluetooth/qbluetoothdevicediscoveryagent_android.cpp
+++ b/src/bluetooth/qbluetoothdevicediscoveryagent_android.cpp
@@ -62,9 +62,17 @@ QBluetoothDeviceDiscoveryAgentPrivate::QBluetoothDeviceDiscoveryAgentPrivate(
     pendingStart(false),
     q_ptr(parent)
 {
+    QAndroidJniEnvironment env;
     adapter = QAndroidJniObject::callStaticObjectMethod("android/bluetooth/BluetoothAdapter",
                                                         "getDefaultAdapter",
                                                         "()Landroid/bluetooth/BluetoothAdapter;");
+    if (!adapter.isValid()) {
+        if (env->ExceptionCheck()) {
+            env->ExceptionDescribe();
+            env->ExceptionClear();
+        }
+        qCWarning(QT_BT_ANDROID) << "Device does not support Bluetooth";
+    }
 }
 
 QBluetoothDeviceDiscoveryAgentPrivate::~QBluetoothDeviceDiscoveryAgentPrivate()