Merge pull request #18 from zain-noman/add-write-bytes

added function to write raw bytes to a bluetooth device

Author: matfire

android/src/main/kotlin/com/matteogassend/bluetooth_classic/BluetoothClassicPlugin.kt

@@ -180,6 +180,14 @@ class BluetoothClassicPlugin: FlutterPlugin, MethodCallHandler, PluginRegistry.R
       )
       "disconnect" -> disconnect(result)
       "write" -> write(result, call.argument<String>("message")!!)
+      "writeBytes" -> {
+          val byteArray = call.arguments as? ByteArray
+          if (byteArray != null) {
+              writeBytes(result, byteArray)
+          } else {
+              result.error("invalid_args", "Expected ByteArray as argument", null)
+          }
+      }
       else -> result.notImplemented()
     }
   }
@@ -194,6 +202,16 @@ class BluetoothClassicPlugin: FlutterPlugin, MethodCallHandler, PluginRegistry.R
     }
   }
 
+  private fun writeBytes(result: Result, message: ByteArray) {
+    Log.i("write_handle", "inside writeBytes handle")
+    if (thread != null) {
+        thread!!.write(message)
+        result.success(true)
+    } else {
+        result.error("write_bytes_impossible", "could not send message to unconnected device", null)
+    }
+  }
+
   private fun disconnect(result: Result) {
     device = null
     android.util.Log.i("Bluetooth Disconnect", "device removed from memory")

lib/bluetooth_classic.dart

@@ -47,4 +47,8 @@ class BluetoothClassic {
   Future<bool> write(String message) {
     return BluetoothClassicPlatform.instance.write(message);
   }
+
+  Future<bool> writeBytes(Uint8List message) {
+    return BluetoothClassicPlatform.instance.writeBytes(message);
+  }
 }

lib/bluetooth_classic_method_channel.dart

@@ -132,4 +132,11 @@ class MethodChannelBluetoothClassic extends BluetoothClassicPlatform {
         .invokeMethod<bool>("write", <String, String>{"message": message});
     return res!;
   }
+
+  @override
+  Future<bool> writeBytes(Uint8List message) async {
+    var res = await methodChannel
+        .invokeMethod<bool>("writeBytes", message);
+    return res!;
+  }
 }

lib/bluetooth_classic_platform_interface.dart

@@ -70,4 +70,8 @@ abstract class BluetoothClassicPlatform extends PlatformInterface {
   Future<bool> write(String message) {
     throw UnimplementedError('write() has not been implemented.');
   }
+
+  Future<bool> writeBytes(Uint8List message) {
+    throw UnimplementedError('writeBytes() has not been implemented.');
+  }
 }