Android Open Source - simple-android-bt Main Activity

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Back to project page simple-android-bt.

License

The source code is released under:

MIT License

Java Source Code

package io.generalpurpose.sandbox;
/*  w ww.j av  a  2  s .c  o  m*/
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

import java.io.IOException;
import java.util.Set;
import java.util.UUID;

public class MainActivity extends Activity {

    private static final String TAG = "SandboxApp";
    private final static int REQUEST_ENABLE_BT = 1;
    public final static int MESSAGE_READ = 2;
    Button initBtButton;
    Button connectButton;
    Button sendDataButton;

    Spinner pairedDevicesSpinner;

    ArrayAdapter<BluetoothDevice> pairedDevicesAdapter;
    BluetoothAdapter mBluetoothAdapter;

    EditText receivedText;
    EditText dataText;
    Toast btUpToast;
    Toast btDownToast;
    Handler mHandler;
    ReadWriteThread rwThread;

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

        mHandler = new Handler(Looper.getMainLooper())
        {
            @Override
            public void handleMessage(Message inputMessage) {
                Log.d(TAG, String.format(
                        "what = %d, arg1 = %d, arg2 = %d",
                        inputMessage.what,
                        inputMessage.arg1,
                        inputMessage.arg2
                ));
            }
        };

        btUpToast = Toast.makeText(getApplicationContext(), "Bluetooth set up successfully", Toast.LENGTH_LONG);
        btDownToast = Toast.makeText(getApplicationContext(), "Bluetooth enable canceled", Toast.LENGTH_LONG);

        receivedText = (EditText)findViewById(R.id.receivedText);
        sendDataButton = (Button)findViewById(R.id.sendDataButton);
        initBtButton = (Button)findViewById(R.id.initBtButton);
        connectButton = (Button)findViewById(R.id.connectButton);
        dataText = (EditText)findViewById(R.id.dataText);
        pairedDevicesSpinner = (Spinner)findViewById(R.id.pairedDevicesSpinner);
        pairedDevicesAdapter = new ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item);

        pairedDevicesSpinner.setAdapter(pairedDevicesAdapter);

        receivedText.setEnabled(false);

        initBtButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
                if (mBluetoothAdapter == null) {
                    Toast noBtToast = Toast.makeText(getApplicationContext(), "No Bluetooth available", Toast.LENGTH_LONG);
                    noBtToast.show();
                }
                else if (!mBluetoothAdapter.isEnabled())
                {
                    Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                    startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
                }
                else
                {
                    btUpToast.show();

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

                    pairedDevicesAdapter.clear();

                    // If there are paired devices
                    if (pairedDevices.size() > 0) {
                        // Loop through paired devices
                        for (BluetoothDevice device : pairedDevices) {
                            // Add the name and address to an array adapter to show in a ListView
                            //pairedDevicesAdapter.add(device.getName() + "\n" + device.getAddress());
                            pairedDevicesAdapter.add(device);
                        }
                    }

                    connectButton.setEnabled(true);
                    connectButton.setClickable(true);
                }
            }
        });

        connectButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.d(TAG, "connect button clicked!");
                BluetoothDevice device = (BluetoothDevice)pairedDevicesSpinner.getSelectedItem();
                Log.d(TAG, String.format("selected device has name %s and MAC %s",
                        device.getName(),
                        device.getAddress()));

                mBluetoothAdapter.cancelDiscovery();
                // start connect thread here
                ConnectThread connectionThread = new ConnectThread(
                        device,
                        new ManageSocketRunnable() {
                            @Override
                            public void manageSocket(BluetoothSocket socket) {
                                rwThread = new ReadWriteThread(socket, new UpdateReceivedRunnable() {
                                    @Override
                                    public void run(int count, byte[] data) {
                                        String decoded = new String(data);
                                        Log.d(TAG, String.format("Received text %s",
                                                decoded));
                                    }
                                });
                                rwThread.start();
                                Log.d(TAG, "rwThread started");
                            }
                        });
                connectionThread.start();
            }
        });

        sendDataButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String text = dataText.getText().toString();
                Log.d(TAG, "send data button clicked!");
                BluetoothDevice device = (BluetoothDevice)pairedDevicesSpinner.getSelectedItem();
                Log.d(TAG, String.format("sending data %s",
                        text));

                if (rwThread.isAlive())
                {
                    rwThread.write(text.getBytes());
                }
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onActivityResult (int requestCode, int resultCode, Intent data)
    {
        if (requestCode == REQUEST_ENABLE_BT)
        {
            Log.d(TAG, String.format("request %d result %d", requestCode, resultCode));
            if (resultCode == RESULT_OK)
            {
                btUpToast.show();
            }
            else
            {
                btDownToast.show();
            }
        }
    }
}

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