問題描述

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'; // <==應填寫藍牙串口模塊的藍牙地址。 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(); } /** * 連接藍牙 * **/ 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='smn'; 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(); /*** 連接藍牙* */button1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) {System.out.println('***11');as(); }});/** * 發送信息 可以發送了 * **/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();} }}); }/** * * 連接藍牙 * **/ 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];// 緩沖數據流 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(); } }

已經可以發送信息到藍牙了，可是怎么接收數據啊？求助

問題解答

自己找了個接受數據的線程……

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(); } } }回答2：

感覺你的寫法有點奇怪……

mBluetoothGattCallback 是 BluetoothGattCallback的實現，用于回調連接狀態和傳輸數據，具體你可以百度一下或看官方文檔