当设备Android系统处于4.3以下的时候，会直接强退

[ouyangshengduo]

在BleBluetooth.java中，使用了这个全局回调变量coreGattCallback，一旦设备不支持BLE4.0,这里就会出问题，导致实例化的时候，程序崩溃，所以，目前我的是直接在用的那里new一个，不知道还有什么解决方案
private BleGattCallback coreGattCallback = new BleGattCallback() {

    @Override
    public void onNotFoundDevice() {
        BleLog.i("coreGattCallback：onNotFoundDevice ");

        bluetoothGatt = null;
        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BleGattCallback) {
                ((BleGattCallback) call).onNotFoundDevice();
            }
        }
    }

    @Override
    public void onConnectSuccess(BluetoothGatt gatt, int status) {
        BleLog.i("coreGattCallback：onConnectSuccess ");

        bluetoothGatt = gatt;
        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BleGattCallback) {
                ((BleGattCallback) call).onConnectSuccess(gatt, status);
            }
        }
        bluetoothGatt.discoverServices();
    }

    @Override
    public void onConnectFailure(BleException exception) {
        BleLog.i("coreGattCallback：onConnectFailure ");

        bluetoothGatt = null;
        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BleGattCallback) {
                ((BleGattCallback) call).onConnectFailure(exception);
            }
        }
    }

    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        BleLog.i("coreGattCallback：onConnectionStateChange "
                + '\n' + "status: " + status
                + '\n' + "newState: " + newState
                + '\n' + "thread: " + Thread.currentThread().getId());

        if (newState == BluetoothGatt.STATE_CONNECTED) {
            connectionState = STATE_CONNECTED;
            onConnectSuccess(gatt, status);

        } else if (newState == BluetoothGatt.STATE_DISCONNECTED) {
            connectionState = STATE_DISCONNECTED;
            onConnectFailure(new ConnectException(gatt, status));

        } else if (newState == BluetoothGatt.STATE_CONNECTING) {
            connectionState = STATE_CONNECTING;
        }

        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BluetoothGattCallback) {
                ((BluetoothGattCallback) call).onConnectionStateChange(gatt, status, newState);
            }
        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        BleLog.i("coreGattCallback：onServicesDiscovered ");

        connectionState = STATE_SERVICES_DISCOVERED;
        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BluetoothGattCallback) {
                ((BluetoothGattCallback) call).onServicesDiscovered(gatt, status);
            }
        }
    }

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        BleLog.i("coreGattCallback：onCharacteristicRead ");

        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BluetoothGattCallback) {
                ((BluetoothGattCallback) call).onCharacteristicRead(gatt, characteristic, status);
            }
        }
    }

    @Override
    public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        BleLog.i("coreGattCallback：onCharacteristicWrite ");

        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BluetoothGattCallback) {
                ((BluetoothGattCallback) call).onCharacteristicWrite(gatt, characteristic, status);
            }
        }
    }

    @Override
    public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
        BleLog.i("coreGattCallback：onCharacteristicChanged ");

        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BluetoothGattCallback) {
                ((BluetoothGattCallback) call).onCharacteristicChanged(gatt, characteristic);
            }
        }
    }

    @Override
    public void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
        BleLog.i("coreGattCallback：onDescriptorRead ");

        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BluetoothGattCallback) {
                ((BluetoothGattCallback) call).onDescriptorRead(gatt, descriptor, status);
            }
        }
    }

    @Override
    public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
        BleLog.i("coreGattCallback：onDescriptorWrite ");

        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BluetoothGattCallback) {
                ((BluetoothGattCallback) call).onDescriptorWrite(gatt, descriptor, status);
            }
        }
    }

    @Override
    public void onReliableWriteCompleted(BluetoothGatt gatt, int status) {
        BleLog.i("coreGattCallback：onReliableWriteCompleted ");

        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BluetoothGattCallback) {
                ((BluetoothGattCallback) call).onReliableWriteCompleted(gatt, status);
            }
        }
    }

    @Override
    public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
    	
        BleLog.i("coreGattCallback：onReadRemoteRssi ");
        Iterator iterator = callbackHashMap.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            Object call = entry.getValue();
            if (call instanceof BluetoothGattCallback) {
                ((BluetoothGattCallback) call).onReadRemoteRssi(gatt, rssi, status);
            }
        }
    }
};

[Jasonchenlijian]

BleManager bleManager = new BleManager(this);
if( bleManager.isSupportBle() ){

}

[ouyangshengduo]

首先是先实例化：
bleManager = new BleManager(mContext);
然后进来：
public BleManager(Context context) {
this.mContext = context;

    if (bleBluetooth == null) {
        bleBluetooth = new BleBluetooth(context);
    }

    bleExceptionHandler = new DefaultBleExceptionHandler(context);

}

其中 bleBluetooth = new BleBluetooth(context);这一句里面有个回调的全局变量coreGattCallback，
coreGattCallback = new BleGattCallback()，而BleGattCallback是继承自BluetoothGattCallback的，然而我用android4.1.1的设备测试的时候，实例化就直接崩溃，所以：
if( bleManager.isSupportBle() ){

}
这一句走不到这里来

[Jasonchenlijian]

建议在使用库之前，自主判断Android版本