安卓手机与蓝牙串口模块的通信

利用安卓手机的蓝牙功能，使用蓝牙串口模块，可以建立嵌入式设备与安卓手机APP的蓝牙数据

收发通道，从而实现手机APP对嵌入式设备的无线控制和通信。建立蓝牙通信测试程序的过程如

下：

1. 使用Android Studio建立一个APP工程。

2. 修改xml，获取蓝牙权限。在AndroidManifest.xml文件中增加以下两行：

    



3. 增加蓝牙通信相关的java代码。

3.1  导入相关的库。

3.2  定义要使用的变量。

3.3  获取手机蓝牙适配器的对象，获得目标蓝牙设备对象，建立连接，获得输入输出流。

      



3.4  收发一些数据，关闭连接。

     



如果能够完成数据收发，接下来就可以建立自己需要的应用级蓝牙功能了。

本文所用的蓝牙模块：





使用的手机以及APP，点击Settings即启动一次蓝牙数据收发：





PC通过蓝牙串口与手机APP收发的数据：





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本文所述的蓝牙通信测试程序相关文件有两个，AndroidManifest.xml内容见第一个图，MyActivity.java内容如下：

package com.example.administrator.myapplication4;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.Set;

import java.util.UUID;

import android.app.Activity;

import android.bluetooth.BluetoothSocket;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.bluetooth.BluetoothAdapter;

import android.bluetooth.BluetoothDevice;

public class MyActivity extends Activity {

    private BluetoothAdapter BA;

    private Set pairedDevices;

    private static String address = "00:06:71:00:6B:D0"; // <==应填写蓝牙串口模块的蓝牙地址。

    private BluetoothSocket btSocket = null;

    private OutputStream outStream = null;

    private InputStream inStream = null;

    private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_my);

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.my, 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) {

            BA = BluetoothAdapter.getDefaultAdapter();

            BluetoothDevice device = BA.getRemoteDevice(address);

//          pairedDevices = BA.getBondedDevices();

            try {

                btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);

            } catch (IOException e) {

            }

            BA.cancelDiscovery();

            try {

                btSocket.connect();

                outStream = btSocket.getOutputStream();

                outStream.write(0x41);

                outStream.write(0x61);

                outStream.write(0x41);

                inStream = btSocket.getInputStream();

                int x = inStream.read();

                outStream.write(x + 1);

            } catch (IOException e) {

            }

            try {

                btSocket.close();

            } catch (IOException e2) {

                // Log .e(TAG,"ON RESUME: Unable to close socket during connection failure", e2);

            }

            return true;

        }

        return super.onOptionsItemSelected(item);

    }

}