手机开发 - Android蓝牙模块连接后怎么接收数据？求助

Question

package myapplication.com.myapplicationble;

import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.PopupMenu;
import android.widget.PopupWindow;
import android.widget.TextView;
import android.widget.Toast;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.UUID;
public class MainActivity extends AppCompatActivity {

    private BluetoothAdapter BA;
    BluetoothServerSocket mmServerSocket;

    private static String address = "20:16:09:26:81:80"; // <==应填写蓝牙串口模块的蓝牙地址。
    private BluetoothSocket btSocket = null;
    private OutputStream outStream = null;
    public InputStream inStream = null;
    EditText editText;
    TextView textView;
    Button button, button1;
    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_main);

        initView();

    }
    /**
     * 连接蓝牙
     * **/
    public void connect() {
        BA = BluetoothAdapter.getDefaultAdapter();
        BluetoothDevice device = BA.getRemoteDevice(address);

//          pairedDevices = BA.getBondedDevices();
        try {
            btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
            new  ReceiveDatas(btSocket).start();
        } catch (IOException e) {
        }
        BA.cancelDiscovery();
        try {
            btSocket.connect();
            String s="sm\n";
            outStream = btSocket.getOutputStream();
            outStream.write(s.getBytes());
            //outStream.write(0x41);
            inStream = btSocket.getInputStream();
            Jieshou();
          //  System.out.println("**" + inStream.toString());
          //  System.out.println("**" + inStream.read());
           //  int x = inStream.read();
            //outStream.write(x+1);
           // System.out.println("****--"+x);



        } catch (IOException e) {
        }
        try {
          //  btSocket.close();
        } catch (Exception e2) {

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

    public void initView() {


        editText = (EditText) findViewById(R.id.edit);
        textView = (TextView) findViewById(R.id.textView);
        button = (Button) findViewById(R.id.button);
        button1 = (Button) findViewById(R.id.button1);
        BA = BluetoothAdapter.getDefaultAdapter();
       /**
        * 连接蓝牙
        * */
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                System.out.println("***11");
                as();
            }
        });
        /**
         * 发送信息 可以发送了
         * **/
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String s = editText.getText().toString().trim();
                try {
                    outStream = btSocket.getOutputStream();
                    inStream=btSocket.getInputStream();
                    outStream.write(s.getBytes());


                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });


    }



/**
 *
 *   连接蓝牙
 * **/
    public void as() {
        new AsyncTask() {

            @Override
            protected String doInBackground(Object[] params) {

                connect();
                return null;
            }

            @Override
            protected void onPreExecute() {
                super.onPreExecute();
            }

            @Override
            protected void onPostExecute(Object o) {
                super.onPostExecute(o);
                Toast.makeText(getApplicationContext(), "2", Toast.LENGTH_SHORT).show();
            }
        }.execute();
    }
/**
     * 
     * */
    public  void Jieshou() {

        new Thread(new Runnable() {
            @Override
            public void run() {
                while(true){


                    ByteArrayOutputStream  byteArrayOutputStream=null;
                    byteArrayOutputStream = new ByteArrayOutputStream();
                    try {
                        inStream=btSocket.getInputStream();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    byte[] buffer = new byte[1024];// 缓冲数据流
                    int temp = 0;
                    //   while( (temp = inStream.read(buffer)) != -1) {
                    //  os.write(buffer, 0, temp);
                    byteArrayOutputStream.write(buffer, 0, temp);
                    //   }
                    System.out.println("*shuju*"+byteArrayOutputStream.toByteArray().toString());
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

            }
        }).start();
    }

  
}

已经可以发送信息到蓝牙了，可是怎么接收数据啊？求助

Answer 1

I found a thread to accept data...

private class ConnectedThread extends Thread {
       private final BluetoothSocket socket;
       private final InputStream inputStream;
       private final OutputStream outputStream;
       public ConnectedThread(BluetoothSocket socket) {
           this.socket = socket;
           InputStream input = null;
           OutputStream output = null;
           try {
               input = socket.getInputStream();
               output = socket.getOutputStream();
           } catch (IOException e) {
               e.printStackTrace();
           }
           this.inputStream = input;
           this.outputStream = output;
       }
       public void run() {
           byte[] buff = new byte[1024];
           int bytes;
           while (true) {
               try {
                   bytes = inputStream.read(buff);
                   String str = new String(buff, "ISO-8859-1");
                   str = str.substring(0, bytes);
                   Log.e("recv", str);

                   Message message=handler.obtainMessage();
                   message.obj=str;
                   handler.sendMessage(message);
               } catch (IOException e) {
                   e.printStackTrace();
                   break;
               }
           }
       }
       public void write(byte[] bytes) {
           try {
               outputStream.write(bytes);
           } catch (IOException e) {
               e.printStackTrace();
           }
       }
       public void cancel() {
           try {
               socket.close();
           } catch (IOException e) {
               e.printStackTrace();
           }
       }
   }

Answer 2

I feel like your way of writing is a bit strange...

mBluetoothGattCallback is the implementation of BluetoothGattCallback, which is used to call back the connection status and transmit data. For details, you can search on Baidu or read the official documentation