我正在试图弄清楚如何设置蓝牙连接，但我的应用程序一直在崩溃。
我认为我在acceptConnect的实施方面有些不妥之处，但我无法弄清楚它是什么。这是我正在使用的代码：
public class Menu extends AppCompatActivity {
private BluetoothAdapter BTAdapter;
public static int REQUEST_BLUETOOTH = 1;
private BluetoothSocket bTSocket;
private BluetoothServerSocket mmServerSocket;
InputStream mmInputStream;
Thread workerThread;
byte[] readBuffer;
int readBufferPosition;
int counter;
volatile boolean stopWorker;
static ArrayList<String> people = new ArrayList<String>();
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.menu);
//Set socket to initially null
bTSocket = null;
//Enable bluetooth
BTAdapter = BluetoothAdapter.getDefaultAdapter();
// Phone does not support Bluetooth so let the user know and exit.
if (BTAdapter == null) {
new AlertDialog.Builder(this)
.setTitle("Not compatible")
.setMessage("Your phone does not support Bluetooth")
.setPositiveButton("Exit", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
System.exit(0);
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
//Request enabling
if (!BTAdapter.isEnabled()) {
Intent enableBT = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBT, REQUEST_BLUETOOTH);
}
acceptConnect(BTAdapter);
beginListenForData();
// ArrayList<String> people = new ArrayList<String>();
final ListView mylv = (ListView) findViewById(R.id.mylv);
ArrayAdapter<String> adapter =
new ArrayAdapter<String>(getApplicationContext(),
android.R.layout.simple_list_item_1,
people) {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
TextView text = (TextView) view.findViewById(android.R.id.text1);
Attendee a1 = new Attendee("Taylor", "Taylor LN");
Attendee a2 = new Attendee("Emily", "Emily LN");
Attendee a3 = new Attendee("Mark", "Mark LN");
Attendee a4 = new Attendee("Steve", "Steve LN");
// String[] here = {a1.getfName(), a2.getfName(), a3.getfName(), a4.getfName()};
ArrayList<String> here = new ArrayList<String>();
here.add(a1.getfName());
here.add(a2.getfName());
here.add(a3.getfName());
here.add(a4.getfName());
String person = String.valueOf(mylv.getItemAtPosition(position));
if (here.contains(person) ){
text.setTextColor(Color.rgb(0,153,76));
}else{
text.setTextColor(Color.RED);
}
mylv.setOnItemClickListener(
new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//String[] here = {"Steve", "Taylor", "Emily", "Mark"};
ArrayList<String> here = new ArrayList<String>();
here.add("Steve");
here.add("Taylor");
here.add("Emily");
here.add("Mark");
String person = String.valueOf(parent.getItemAtPosition(position));
if (Arrays.asList(here).contains(person)
){
Toast.makeText(Menu.this, person + " is here", Toast.LENGTH_LONG).show();
}
else
{
// Toast.makeText(Menu.this, person + " is not here", Toast.LENGTH_LONG).show();
}
}
}
);
return view;
}
};
mylv.setAdapter(adapter);
mylv.setVisibility(View.GONE);
}
@Override
protected void onStart() {
super.onStart();
}
public void back(View view)
{
Intent intent = new Intent(Menu.this, List.class);
closeConnect();
startActivity(intent);
}
void acceptConnect(BluetoothAdapter bTAdapter) {
BluetoothServerSocket temp = null;
Log.d("SERVERCONNECT", "Attempting to create server");
UUID mUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
try {
//temp = bTAdapter.listenUsingRfcommWithServiceRecord(bTAdapter.getName(), mUUID);
//Testing with hard coded name
temp = bTAdapter.listenUsingInsecureRfcommWithServiceRecord("Attend", mUUID);
}
catch(IOException e) {
Log.d("SERVERCONNECT", "Could not get a BluetoothServerSocket:" + e.toString());
}
//mmServerSocket = temp;
while(true) {
try {
bTSocket = temp.accept();
Log.d("SERVERCONNECT", "Changing temp to bTSocket");
}
catch (IOException e) {
Log.d("SERVERCONNECT", "Could not accept an incoming connection.");
break;
}
if (bTSocket != null) {
try {
Log.d("SERVERCONNECT", "Closing temp");
temp.close();
}
catch (IOException e) {
Log.d("SERVERCONNECT", "Could not close ServerSocket:" + e.toString());
}
break;
}
}
}
public void closeConnect() {
stopWorker = true;
try {
mmInputStream.close();
} catch(IOException e){
Log.d("SERVERCONNECT", "Could not close connection:" + e.toString());
}
try {
bTSocket.close();
} catch(IOException e) {
Log.d("SERVERCONNECT", "Could not close connection:" + e.toString());
}
}
void beginListenForData()
{
final Handler handler = new Handler();
final byte delimiter = 10; //This is the ASCII code for a newline character
try {
mmInputStream = bTSocket.getInputStream();
} catch(IOException e){
Log.d("LISTEN", "Could not create input stream" + e.toString());
}
stopWorker = false;
readBufferPosition = 0;
readBuffer = new byte[1024];
workerThread = new Thread(new Runnable()
{
public void run()
{
while(!Thread.currentThread().isInterrupted() && !stopWorker)
{
try
{
int bytesAvailable = mmInputStream.available();
if(bytesAvailable > 0)
{
byte[] packetBytes = new byte[bytesAvailable];
mmInputStream.read(packetBytes);
for(int i=0;i<bytesAvailable;i++)
{
byte b = packetBytes[i];
if(b == delimiter)
{
byte[] encodedBytes = new byte[readBufferPosition];
System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
final String data = new String(encodedBytes, "US-ASCII");
readBufferPosition = 0;
handler.post(new Runnable()
{
public void run()
{
people.add(data);
}
});
}
else
{
readBuffer[readBufferPosition++] = b;
}
}
}
}
catch (IOException ex)
{
stopWorker = true;
}
}
}
});
workerThread.start();
}
}
任何帮助将不胜感激..谢谢
答案 0 :(得分：0)
请检查createMessage()中的acceptConnect()方法是否被视为无视蓝牙可用性。
onCreate()只有在蓝牙可用时才能继续。
您可以处理用户选择正常或拒绝蓝牙时发生的情况
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.menu);
//Set socket to initially null
bTSocket = null;
//Enable bluetooth
BTAdapter = BluetoothAdapter.getDefaultAdapter();
// Phone does not support Bluetooth so let the user know and exit.
if (BTAdapter == null) {
new AlertDialog.Builder(this)
.setTitle("Not compatible")
.setMessage("Your phone does not support Bluetooth")
.setPositiveButton("Exit", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
System.exit(0);
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
//Request enabling
if (!BTAdapter.isEnabled()) {
Intent enableBT = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBT, REQUEST_BLUETOOTH);
}
// wait until the request is accepted, and then continue
else
{
acceptConnect(BTAdapter);
beginListenForData();
}
}