Bluetooth is turned on and turned off the search

Layout file

<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".Demo">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/start"
        android:text="开启"
        android:onClick="blueTooth"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/shou"
        android:text="搜索"
        android:onClick="blueTooth"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/stop"
        android:text="关闭"
        android:onClick="blueTooth"
        />
    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/rlist"
        ></android.support.v7.widget.RecyclerView>

</LinearLayout>

Master classes and class Bean

Bean class

public class Bean {
    private String name;
    private String address;
    private BluetoothDevice device;

    public Bean(String name, String address, BluetoothDevice device) {
        this.name = name;
        this.address = address;
        this.device = device;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public BluetoothDevice getDevice() {
        return device;
    }

    public void setDevice(BluetoothDevice device) {
        this.device = device;
    }
}

The main class

public class Demo extends AppCompatActivity {

    MyAdapter adapter;
    RecyclerView rlist;
    List<Bean> lists = new ArrayList<>();

    BluetoothAdapter blueadapter;
    BluetoothManager manager;
    BlueBluetoothReceiver receiver;

    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_demo);

        initView();
        initData();
    }

    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    private void initData() {
        manager = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
        blueadapter = manager.getAdapter();

        if(blueadapter == null){
            finish();
            return;
        }

        receiver = new BlueBluetoothReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothDevice.ACTION_FOUND);//可发现
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);//搜索结束
        filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);//绑定状态
        registerReceiver(receiver,filter);
    }

    private void initView() {
        rlist = findViewById(R.id.rlist);

        LinearLayoutManager manager = new LinearLayoutManager(this);
        manager.setOrientation(LinearLayoutManager.VERTICAL);
        rlist.setLayoutManager(manager);

        adapter = new MyAdapter(this, (ArrayList<Bean>) lists);
        rlist.setAdapter(adapter);
    }

    public void blueTooth(View view) {
        switch (view.getId()){
            case R.id.start:
                boolean enable = blueadapter.enable();
                if(!enable){
                    Intent intent = new Intent();
                    intent.setAction(BluetoothAdapter.ACTION_REQUEST_ENABLE);//启动蓝牙
                    intent.setAction(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);//开启设备可发现
                    intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION,200);//设定搜索设备时间
                    startActivityForResult(intent,100);
                }
                break;
            case R.id.shou:
                blueadapter.startDiscovery();//开启搜索
                break;
            case R.id.stop:
                blueadapter.disable();//关闭蓝牙
                lists.clear();//清空集合
                adapter.notifyDataSetChanged();//刷新适配器
                break;
                default:
                    break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == 100){
            if(resultCode == RESULT_OK){
                Toast.makeText(this, "开启蓝牙", Toast.LENGTH_SHORT).show();
            }
        }
    }

    class BlueBluetoothReceiver extends BroadcastReceiver{
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            switch (action){
                case BluetoothDevice.ACTION_FOUND:
                    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    String name = device.getName();
                    String address = device.getAddress();
                    Bean bean = new Bean(name,address,device);
                    lists.add(bean);
                    adapter.notifyDataSetChanged();
                    break;
                case BluetoothAdapter.ACTION_DISCOVERY_FINISHED:
                    adapter.notifyDataSetChanged();
                    break;
                    default:
                        break;
            }
        }
    }
}

Adapter class

Adapter class

 class MyAdapter extends RecyclerView.Adapter<MyAdapter.RHolder>{
    
        Context context;
        ArrayList<Bean> lists;
    
        public MyAdapter(Context context, ArrayList<Bean> lists) {
            this.context = context;
            this.lists = lists;
        }
    
        @NonNull
        @Override
        public RHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
            View view = LayoutInflater.from(context).inflate(R.layout.item,viewGroup,false);
            return new RHolder(view);
        }
    
        @Override
        public void onBindViewHolder(@NonNull RHolder rHolder, int i) {
            rHolder.name.setText(lists.get(i).getName());
            rHolder.address.setText(lists.get(i).getAddress());
        }
    
        @Override
        public int getItemCount() {
            return lists.size();
        }
    
        class RHolder extends RecyclerView.ViewHolder{
    
            TextView name;
            TextView address;
    
            public RHolder(@NonNull View itemView) {
                super(itemView);
    
                name = itemView.findViewById(R.id.name);
                address = itemView.findViewById(R.id.address);
            }
        }
    }

layout

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/name"
        />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/address"
        />

</LinearLayout>

Renderings