如何从 android 应用程序发送值到 Arduino 蓝牙 HC-05

Question

I am making an android app using android studio ,

I want to send value 'string or Integer' to arduino pro mini via bluetooth hc-05.

The bluetooth hc-05 will already be connected (paired) to the android device .

Can you please help me to make a simple code that send the value via bluetooth? Thank you so much.

Answer 1

Well, the easiest way to implement that is to use a third-party library like this BluetoothLibrary .

• Include the library dependency into your app module gradle file.
• set up the library in your app as described in the library's repository on GitHub.
• If you need to connect to the device from the app you have to implement the scanning functionality yourself by providing a ListView and the logic to insert the discovered Bluetooth devices.
• If you prefer to follow the easy way just connect to the Bluetooth device externally from your device's Bluetooth manager, then you can communicate with the device as follows.

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main)

    bluetooth = new Bluetooth(this);
    bluetooth.send("Your message");

}

• If you want to receive back some response from the other Bluetooth device you have to listen to the DeviceCallback() you will find its description in the Github repository

Note

You have to add some permissions in the Manifest files which are

• BLUETOOTH
• BLUETOOTH_ADMIN
• ACCESS_COARSE_LOCATION

In order to give the access to your app to use the bluetooth