Android Bluetooth Printing with Actual Printer Device Example

 import android.app.Activity;

import android.bluetooth.BluetoothAdapter;

import android.bluetooth.BluetoothDevice;

import android.bluetooth.BluetoothSocket;

import android.content.Intent;

import android.os.Bundle;

import android.os.Handler;

import android.view.View;

import android.widget.TextView;

import android.widget.EditText;

import android.widget.Button;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.Set;

import java.util.UUID;

public class MainActivity extends Activity {

}

/ will show the statuses like bluetooth open, close or data sent

TextView myLabel;

// will enable user to enter any text to be printed

EditText myTextbox;

// android built in classes for bluetooth operations

BluetoothAdapter mBluetoothAdapter;

BluetoothSocket mmSocket;

BluetoothDevice mmDevice;

// needed for communication to bluetooth device / network

OutputStream mmOutputStream;

InputStream mmInputStream;

Thread workerThread;

byte[] readBuffer;

int readBufferPosition;

volatile boolean stopWorker;




@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    try {

        // more codes will be here

    }catch(Exception e) {

        e.printStackTrace();

    }

}







/ we are going to have three buttons for specific functions

Button openButton = (Button) findViewById(R.id.open);

Button sendButton = (Button) findViewById(R.id.send);

Button closeButton = (Button) findViewById(R.id.close);

// text label and input box

myLabel = (TextView) findViewById(R.id.label);

myTextbox = (EditText) findViewById(R.id.entry);




// open bluetooth connection

openButton.setOnClickListener(new View.OnClickListener() {

    public void onClick(View v) {

        try {

            findBT();

            openBT();

        } catch (IOException ex) {

            ex.printStackTrace();

        }

    }

});




this will find a bluetooth printer device

void findBT() {

    try {

        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        if(mBluetoothAdapter == null) {

            myLabel.setText("No bluetooth adapter available");

        }

        if(!mBluetoothAdapter.isEnabled()) {

            Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

            startActivityForResult(enableBluetooth, 0);

        }

        Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();

        if(pairedDevices.size() > 0) {

            for (BluetoothDevice device : pairedDevices) {

                 

                // RPP300 is the name of the bluetooth printer device

                // we got this name from the list of paired devices

                if (device.getName().equals("RPP300")) {

                    mmDevice = device;

                    break;

                }

            }

        }

        myLabel.setText("Bluetooth device found.");

    }catch(Exception e){

        e.printStackTrace();

    }

}