android studio蓝牙APP与HC-06通信收发数据

一、bt_data_rw.xml布局 

<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#2196F3"
    tools:context=".BT_data_RW">

    <TextView
        android:id="@+id/read_Text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="消息列表"
        android:background="#03A9F4"
        android:gravity="center"
        android:textSize="24dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

    <ListView
        android:id="@+id/read_list"
        android:layout_width="296dp"
        android:layout_height="420dp"
        app:layout_constraintBottom_toTopOf="@id/write_Text"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.495"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/read_Text" />

    <TextView
        android:id="@+id/write_Text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="发送消息"
        android:background="#00BCD4"
        android:gravity="center"
        android:textSize="24dp"
        app:layout_constraintTop_toBottomOf="@id/read_list"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toTopOf="@id/editTEXT"/>
    <EditText
        android:id="@+id/editTEXT"
        android:layout_width="0dp"
        android:layout_height="49dp"
        android:ems="10"
        android:inputType="textPersonName"
        app:layout_constraintTop_toBottomOf="@id/write_Text"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toStartOf="@id/write_button"/>
    <Button
        android:id="@+id/write_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="发送"
        app:layout_constraintTop_toBottomOf="@id/write_Text"
        app:layout_constraintStart_toEndOf="@id/editTEXT"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        />

</androidx.constraintlayout.widget.ConstraintLayout>

二、BT_data_RW.java源代码

必须包含

import android.Manifest;//manifest文件

public class BT_data_RW extends AppCompatActivity {
    //获取权限
    private ArrayList<String> requestList = new ArrayList<>();
    // 弹窗
    private Toast mToast;
    // 文字输入框
    public EditText editText;
    // listview控件
    public ListView listView;

    public Button  sendBt;
    // 蓝牙服务
    private BluetoothSocket bluetoothSocket;
    // 消息列表
    public ArrayList<String> msglist = new ArrayList<>();
    // ArrayAdapter
    public ArrayAdapter adapter1;
    // 读取数据线程
    public readThread readthread = new readThread();
    // 实例化BTclient
    private BTclient bTclient = new BTclient();
    // 实例化蓝牙适配器类
    public MainActivity.BlueToothController mController = new MainActivity.BlueToothController();
    // 活动间消息传递
    public Handler mHandler;
    @SuppressLint("HandlerLeak")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.bt_data_rw);
        // 根据ID获取listview和editText
        listView = (ListView) findViewById(R.id.read_list);
        editText = (EditText) findViewById(R.id.editTEXT);
        sendBt=(Button)findViewById(R.id.write_button) ;
        // 实例化ArrayAdapter
        adapter1 = new ArrayAdapter(this, android.R.layout.simple_expandable_list_item_1, msglist)