Android Studio 之蓝牙串口通信（SPP）
撰写不易，记下条记，满是干货源码：一、先创建一个空project
[*] 选择Empty Activity，然后Next
https://img-blog.csdnimg.cn/direct/f85eee60928d49b09ca012a2455e5752.png
[*] 选择工程位置与项目名称，然后点Finsh即可
https://img-blog.csdnimg.cn/direct/8dd76b8f7a3a425c911effeeede95573.png
二、设计结构activity_main.xml（如下）
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/text1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textSize="20dp"
android:text="本地蓝牙设备："
app:layout_constraintEnd_toStartOf="@+id/guideline2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="10dp"/>
<TextView
android:id="@+id/text2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textSize="20dp"
android:text="设备名称"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/guideline2"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="10dp"/>
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="205dp"/>
<Button
android:id="@+id/button_open"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="打开蓝牙"
android:textSize="20dp"
app:layout_constraintEnd_toStartOf="@id/guideline2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/text1" />
<Button
android:id="@+id/button_close"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="关闭蓝牙"
android:textSize="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@id/guideline2"
app:layout_constraintTop_toBottomOf="@id/text2"/>
<Button
android:id="@+id/button_search"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="搜索蓝牙设备"
android:textSize="20dp"
app:layout_constraintEnd_toStartOf="@+id/guideline2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button_open" />
<Button
android:id="@+id/button_check"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="已绑定设备"
android:textSize="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/guideline2"
app:layout_constraintTop_toBottomOf="@+id/button_close" />
<ListView
android:id="@+id/listview1"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#6D91AE"
android:gravity="center"
android:text="蓝牙列表"
android:textSize="25dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button_search" />
</androidx.constraintlayout.widget.ConstraintLayout> https://img-blog.csdnimg.cn/direct/1b374c012fcc42f982d864f8d8abd4c9.png
三、再新建一个Empty Activity，作为连接后跳转的界面（命名为send_and_receive或自界说命名）
https://img-blog.csdnimg.cn/direct/efb50515c1294fb6820b1621e7176347.png
https://img-blog.csdnimg.cn/direct/9bb44be99273481f9439fbc5099eea73.png
四、设计结构activity_send_and_receive.xml（如下）
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Send_and_receive">
<TextView
android:id="@+id/textView_ble"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:gravity="fill_vertical"
android:text="蓝牙状态："
android:textSize="20dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView_ble_connect"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_marginStart="70dp"
android:gravity="fill_vertical"
android:text="已连接"
android:textColor="#3F51B5"
android:textSize="20dp"
app:layout_constraintStart_toEndOf="@+id/textView_ble"
app:layout_constraintTop_toTopOf="parent" />
<ListView
android:id="@+id/listView_receive"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="@+id/textView_send"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.538"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView_receive" />
<TextView
android:id="@+id/textView_receive"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#6D91AE"
android:gravity="center"
android:text="接收区"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView_ble" />
<TextView
android:id="@+id/textView_send"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#6D91AE"
android:gravity="center"
android:text="发送区"
android:textSize="24sp"
app:layout_constraintBottom_toTopOf="@+id/editText_send"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent" />
<EditText
android:id="@+id/editText_send"
android:layout_width="0dp"
android:layout_height="50dp"
android:ems="10"
android:inputType="textPersonName"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/button_send"
app:layout_constraintStart_toStartOf="parent" />
<Button
android:id="@+id/button_send"
android:layout_width="100dp"
android:layout_height="50dp"
android:text="发送"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="@+id/editText_send" />
</androidx.constraintlayout.widget.ConstraintLayout> https://img-blog.csdnimg.cn/direct/516f8066c35640a18295b327e6503efa.png
五、在res文件下新建一个文件命名为menu，而后在该文件下新建一个菜单栏menu1.xml
https://img-blog.csdnimg.cn/direct/4c2ce748322548838bc84cb81aa279ca.png
https://img-blog.csdnimg.cn/direct/053e0a2295ab40048ed825c68be7fe1d.png
六、menu1.xml菜单设计
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/menu_button_connect" android:title="连接蓝牙设备"/>
<item android:id="@+id/menu_button_disconnect" android:title="断开蓝牙设备"/>
<item android:id="@+id/menu_button_return" android:title="返回上一页"/>
<item android:id="@+id/menu_button_clean" android:title="清除数据"/>
</menu> 七、AndroidMainfest.xml文件中添加权限申请（如下）
<!-- 添加权限 -->
<!-- 允许应用程序使用本机设备的蓝牙功能 -->
<uses-permission android:name="android.permission.BLUETOOTH" /> <!-- 允许应用程序对蓝牙进行发现和配对，注：安装12新增的蓝牙权限 -->
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> <!-- 定位权限，蓝牙搜索需要 -->
<uses-permission android:name="android.permission.BLUETOOTH_SCAN" /> <!-- 允许应用程序连接到蓝牙设备 -->
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" /> <!-- 允许应用程序启用蓝牙广播功能 -->
<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" /> <!-- 应用程序需访问设备的精准地理位置 -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <!-- 应用程序需访问设备的粗略地理位置 -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 八、新建一个蓝牙适配器类BluetoothController.java
https://img-blog.csdnimg.cn/direct/5b93a5e1428b4d2999d493e6ad2c7061.png
代码如下：
package com.example.ble_0426;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.util.Log;
import java.lang.reflect.Method;
import java.util.ArrayList;
/**
*蓝牙控制器
*/
public class BluetoothController {
//成员变量
private BluetoothAdapter mAdapter;
private BluetoothSocket btSocket;
private String TAG = "";
String bluetoothName;
/**
* 构造函数
*/
public BluetoothController()
{
//获取本地的蓝牙适配器
mAdapter =BluetoothAdapter.getDefaultAdapter();
}
/**
*获取本机蓝牙名称
*/
public String getBluetoothName()
{
bluetoothName = mAdapter.getName();
return bluetoothName;
}
/**
* 打开蓝牙
*/
public void turnOnBlueTooth(Activity activity, int requestCode)
{
if (!mAdapter.isEnabled())
{
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
activity.startActivityForResult(intent, requestCode);
}
else
return;
}
/**
* 关闭蓝牙
*/
public void turnOffBlueTooth()
{
if (mAdapter.isEnabled())
{
mAdapter.disable();
}
}
/**
* 根据蓝牙地址找到相应的设备
*/
public BluetoothDevice find_device(String addr)
{
return mAdapter.getRemoteDevice(addr);
}
/**
*停止搜索设备
*/
public void cancelSearch()
{
mAdapter.cancelDiscovery();
}
/**
* 搜索蓝牙设备
*/
public boolean searchBle()
{
assert (mAdapter !=null);
if (mAdapter.isDiscovering())
{
mAdapter.cancelDiscovery();
return false;
}
else {
return mAdapter.startDiscovery();
}
}
/**
* 查看已绑定的蓝牙设备
*/
public ArrayList<BluetoothDevice> getBleDeviceList()
{
return new ArrayList<BluetoothDevice>(mAdapter.getBondedDevices());
}
}
九、MainActivity.java代码如下：
package com.example.ble_0426;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import android.Manifest;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
//蓝牙权限列表
public ArrayList<String> requestList = new ArrayList<>();
//常量
private static final int REQ_PERMISSION_CODE = 1;
//实例化蓝牙控制器
public BluetoothController btController = new BluetoothController();
//弹窗
private Toast mToast;
//定义一个列表，存蓝牙设备地址，用于显示
public ArrayList<String> deviceName = new ArrayList<>();
//定义一个列表，存储蓝牙设备的地址
public ArrayList<String> arrayList = new ArrayList<>();
//定义一个适配器，用于刷新列表更新
public ArrayAdapter adapter1;
//搜索蓝牙广播
private IntentFilter foundFilter;
/**
* 搜索蓝牙广播，将搜索到的蓝牙名称和地址添加到列表上
*/
private final BroadcastReceiver bluetoothReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action))
{
String label;
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device.getBondState() == 12)
{
label = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n";
}
else if (device.getBondState() == 10)
{
label = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未配对" + "\n";
}
else
{
label = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未知" + "\n";
}
if (!deviceName.contains(label))
{
deviceName.add(label); //将搜索到的设备添加到列表上
arrayList.add(device.getAddress()); //将搜索到的蓝牙地址添加到列表上
adapter1.notifyDataSetChanged(); //更新
}
}
else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action))
{
showToast("搜索结束");
unregisterReceiver(this);
}
else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action))
{
showToast("开始搜索");
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//显示本机蓝牙名称
TextView textView_name = (TextView) findViewById(R.id.text2);
textView_name.setText(btController.getBluetoothName());
//蓝牙状态改变信息
IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
//搜索蓝牙广播
foundFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
foundFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
foundFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
//实例化ArrayAdapter
adapter1 = new ArrayAdapter(this, android.R.layout.simple_expandable_list_item_1,deviceName);
//通过id获取ListView组件
ListView listView = (ListView) findViewById(R.id.listview1);
//添加到LisView组件中
listView.setAdapter(adapter1);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
CharSequence content = ((TextView) view).getText();
String con = content.toString();
String[] conArray = con.split("\n");
String rightStr = conArray.substring(5,conArray.length());
BluetoothDevice device = btController.find_device(rightStr);
if (device.getBondState() == 10)
{
btController.cancelSearch();
String label = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未配对" + "\n";
deviceName.remove(label);
device.createBond();
label = "设备名：" + device.getName() +"\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n";
deviceName.add(label);
adapter1.notifyDataSetChanged();
showToast("配对："+device.getName());
}
else
{
btController.cancelSearch();
String label = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n";
if (deviceName.contains(label))
{
Intent intent = new Intent(MainActivity.this,Send_and_receive.class);
Bundle bundle = new Bundle();
bundle.putString("deviceAddr", device.getAddress());
intent.putExtras(bundle);
startActivity(intent);
finish();
}
}
}
});
//自动打开蓝牙
openBle();
/**
* 手动打开蓝牙
*/
//通过id获取“打开蓝牙”按钮
Button button_open = (Button) findViewById(R.id.button_open);
//绑定按钮点击事件处理函数
button_open.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
openBle();
}
});
/**
* 关闭蓝牙
*/
//通过id获取“关闭蓝牙”按钮
Button button_close = (Button) findViewById(R.id.button_close);
//绑定按钮点击事件处理函数
button_close.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
closeBle();
}
});
/**
* 搜索蓝牙设备
*/
//通过id获取”搜索蓝牙设备“按钮
Button button_search = (Button) findViewById(R.id.button_search);
//绑定按钮点击事件处理函数
button_search.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getPermision(); //获取蓝牙权限
registerReceiver(bluetoothReceiver,foundFilter); //注册广播
//初始化各个列表
arrayList.clear();
deviceName.clear();
adapter1.notifyDataSetChanged(); //更新
btController.searchBle();
}
});
/**
* 查看已绑定设备
*/
//通过id获取”已绑定设备“按钮
Button button_check = (Button) findViewById(R.id.button_check);
//绑定按钮点击事件处理函数
button_check.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getPermision(); //获取蓝牙权限
//初始化各个列表
arrayList.clear();
deviceName.clear();
adapter1.notifyDataSetChanged(); //更新
//获取已绑定的蓝牙设备
ArrayList<BluetoothDevice> bluetoothDevices = btController.getBleDeviceList();
//更新列表
for (int i = 0; i < bluetoothDevices.size(); i++)
{
BluetoothDevice device = bluetoothDevices.get(i);
arrayList.add(device.getAddress());
if (device.getBondState() == 12) {
deviceName.add("设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n");
} else if (device.getBondState() == 10) {
deviceName.add("设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未配对" + "\n");
} else {
deviceName.add("设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未知" + "\n");
}
adapter1.notifyDataSetChanged();
}
}
});
}
/**
* 打开蓝牙
*/
public void openBle()
{
getPermision(); //蓝牙权限
btController.turnOnBlueTooth(this,1);
}
/**
* 关闭蓝牙
*/
public void closeBle()
{
getPermision(); //蓝牙权限
btController.turnOffBlueTooth();
}
/**
* 动态申请权限
*/
public void getPermision()
{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S)
{
requestList.add(Manifest.permission.BLUETOOTH);
requestList.add(Manifest.permission.BLUETOOTH_SCAN);
requestList.add(Manifest.permission.BLUETOOTH_ADVERTISE);
requestList.add(Manifest.permission.BLUETOOTH_CONNECT);
requestList.add(Manifest.permission.ACCESS_FINE_LOCATION);
requestList.add(Manifest.permission.ACCESS_COARSE_LOCATION);
}
if(requestList.size() != 0)
{
ActivityCompat.requestPermissions(this,requestList.toArray(new String),REQ_PERMISSION_CODE);
}
}
/**
* 弹窗
*/
public void showToast(String text)
{
if (mToast == null)
{
//初始化
mToast = Toast.makeText(this,text,Toast.LENGTH_SHORT);
}
else
{
//修改显示文本
mToast.setText(text);
}
//显示
mToast.show();
}
} 十、Send_and receive.java代码如下：
package com.example.ble_0426;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import android.Manifest;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
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.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.UUID;
public class Send_and_receive extends AppCompatActivity {
//蓝牙权限列表
public ArrayList<String> requestList = new ArrayList<>();
//常量
private static final int REQ_PERMISSION_CODE = 1;
//弹窗
private Toast mToast;
//蓝牙服务
private BluetoothSocket bluetoothSocket;
//实例化BleConnect
private BleConnect bleConnect = new BleConnect();
//实例化蓝牙适配器类
public BluetoothController mController = new BluetoothController();
//文本输入框
public EditText editText;
//接收区
public ListView listView;
//蓝牙状态文本显示
public TextView text;
//消息列表
public ArrayList<String> listMessage = new ArrayList<>();
//定义适配器
public ArrayAdapter adapter1;
//活动间消息传递
public Handler mHandler;
//读取数据线程
public readMessage readmessage = new readMessage();
private Bundle bundle;
public Button button_send;
public Menu button_return;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_send_and_receive);
//获取intent
Intent intent = getIntent();
//获取intent传来的数据
bundle = intent.getExtras();
//连接服务
bleConnect.connectDevice(mController.find_device(bundle.getString("deviceAddr")));
//线程服务开始
bleConnect.start();
//文本输入框
editText = (EditText) findViewById(R.id.editText_send);
//接收区
listView = (ListView) findViewById(R.id.listView_receive);
//设置返回界面
button_return = (Menu) findViewById(R.id.menu_button_return);
//蓝牙状态文本显示
text = (TextView) findViewById(R.id.textView_ble_connect);
//实例化ArrayAdapter
adapter1 = new ArrayAdapter(this, android.R.layout.simple_expandable_list_item_1,listMessage);
//设置listView
listView.setAdapter(adapter1);
// 实例化Handler
mHandler = new Handler(Looper.myLooper()) {
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 1:
String s = msg.obj.toString();
listMessage.add("接收数据：" + s);
adapter1.notifyDataSetChanged();
break;
}
}
};
/**
* 发送按钮
*/
//通过id获取“发送”按钮
button_send = (Button) findViewById(R.id.button_send);
//绑定按钮点击事件处理函数
button_send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String message = editText.getText().toString();
if (message.length() != 0)
{
sendMessage(message);
listMessage.add("发送数据：" + message + "\n");
adapter1.notifyDataSetChanged();
}
}
});
}
/**
* 读取数据
*/
private class readMessage extends Thread
{
private static final String TAG = "";
public void run()
{
super.run();
byte[] buffer = new byte;
int bytes;
InputStream inputStream = null;
try {
inputStream = bluetoothSocket.getInputStream();
}
catch (IOException e1)
{
e1.printStackTrace();
}
while (true)
{
try {
if ((bytes = inputStream.read(buffer)) > 0)
{
byte[] buf_data = new byte;
for (int i = 0; i < bytes; i++)
{
buf_data = buffer;
}
String text = new String(buf_data, 0, bytes, "utf-8"); //接收的值inputstream 为 text
Message message = Message.obtain();
message.what = 1;
message.obj = text;
mHandler.sendMessage(message);
if (text.equalsIgnoreCase("o"))
{
//o表示opend
showToast("open");
}
else if (text.equalsIgnoreCase("c"))
{
//c表示close
showToast("close");
}
}
}
catch (IOException e)
{
try {
inputStream.close();
}
catch (IOException e1)
{
e1.printStackTrace();
}
break;
}
}
}
}
/**
* 发送数据
*/
public void sendMessage(String label)
{
getPermision(); //获取权限
if (bluetoothSocket == null)
{
showToast("没有连接");
return;
}
try
{
OutputStream os = bluetoothSocket.getOutputStream();
os.write(label.getBytes()); //发送出去的值为：label
}
catch (IOException e)
{
e.printStackTrace();
}
}
/**
* 连接蓝牙
*/
private class BleConnect extends Thread
{
private void connectDevice(BluetoothDevice device)
{
try
{
getPermision();
bluetoothSocket = device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")); //蓝牙串口服务UUID（SPP）
bluetoothSocket.connect();
readmessage.start();
showToast("蓝牙连接成功");
}
catch (IOException e)
{
e.printStackTrace();
showToast("蓝牙连接失败");
}
}
}
/**
* 断开蓝牙
*/
public void disConnect()
{
try {
bluetoothSocket.close();
bluetoothSocket = null;
button_send.setEnabled(false);
showToast("蓝牙断开");
text.setText("已断开");
}
catch (IOException e)
{
e.printStackTrace();
}
}
/**
*菜单栏
*/
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.menu1,menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.menu_button_connect: //连接蓝牙，还未写
break;
case R.id.menu_button_disconnect: //断开蓝牙
getPermision();
disConnect();
break;
case R.id.menu_button_return: //返回上一页
Intent intent = new Intent(Send_and_receive.this,MainActivity.class);
startActivity(intent);
break;
case R.id.menu_button_clean: //清除数据
adapter1.clear();
break;
default:
}
return true;
}
/**
* 动态申请权限
*/
public void getPermision()
{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S)
{
requestList.add(Manifest.permission.BLUETOOTH);
requestList.add(Manifest.permission.BLUETOOTH_SCAN);
requestList.add(Manifest.permission.BLUETOOTH_ADVERTISE);
requestList.add(Manifest.permission.BLUETOOTH_CONNECT);
requestList.add(Manifest.permission.ACCESS_FINE_LOCATION);
requestList.add(Manifest.permission.ACCESS_COARSE_LOCATION);
}
if(requestList.size() != 0)
{
ActivityCompat.requestPermissions(this,requestList.toArray(new String),REQ_PERMISSION_CODE);
}
}
/**
* 弹窗
*/
public void showToast(String text)
{
if (mToast == null)
{
//初始化
mToast = Toast.makeText(this,text,Toast.LENGTH_SHORT);
}
else
{
//修改显示文本
mToast.setText(text);
}
//显示
mToast.show();
}
} 注：若上方代码有不理解的可一起在评论区讨论
效果运行如下：
蓝牙串口通信
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