add null check

2017-09-09 12:50:47 +08:00
parent 8a081b144a
commit 19ccf91e97
2 changed files with 1 additions and 4 deletions
@@ -312,7 +312,7 @@ public class PrinterBle {
    }

    private void sendData(byte[] data) {
-        if (data == null || data.length < 1 || data.length > 20) return;
+        if (data == null || data.length < 1 || data.length > 20 || printerCharacteristic == null) return;

        boolean setVal = printerCharacteristic.setValue(data);
        boolean sendVal = mBtGatt.writeCharacteristic(printerCharacteristic);