通过蓝牙向Android发送字节时发生java错误
我在安卓系统中通过蓝牙发送字节方面遇到了很大的困难，我想明确地说，我已经看过了一些教程和安卓开发者页面
我的应用程序的基本功能是打开/关闭蓝牙，搜索设备并连接到它们，列出配对设备并连接到它们，它有一个控件（它们只是发送数据的图像按钮），我必须记录用户何时搜索设备以及何时想要查看配对设备的活动，以便如果发送数据在其中一个设备上有效，则可以在另一个设备上有效
我的困难在于发送数据，显然我在代码中做了一些错误的事情。我已经用toast饱和了代码，以了解我何时执行应用程序的某些步骤（一旦我完成应用程序的最后一步，此toast将被删除）
在这些饱和状态下，我发现我的代码实际上发送了字节，但似乎没有发送它们，这是我不知道如何解决的问题（我的代码连接到另一个蓝牙设备-它甚至停止闪烁红色LED指示灯来告诉我，日志告诉我我已连接到它），我甚至复制了一些代码，将其更改为我的一部分，并执行我希望它执行的操作
我的XML具有所有必要的权限
代码：
public class SerachDevices extends ActionBarActivity {
private final BluetoothAdapter BT = BluetoothAdapter.getDefaultAdapter();
private BluetoothDevice bluetoothDevice;
ListView FoundD;
ImageButton btBUp;
ImageButton btBDown;
ImageButton btBLeft;
ImageButton btBRigth;
ImageButton btBStop;
String mensaje; private ArrayAdapter<String> discoveredDevices;
int Gone = View.GONE;
int Visible = View.VISIBLE;
ConexionABluetooth conectar;
//Metod to find devices
public void Descubrir() {
BT.startDiscovery();
if (BT.startDiscovery()) {
mensaje = "Buscando dispositivos";
Toast.makeText(getApplicationContext(), mensaje, Toast.LENGTH_SHORT).show();
} else {
mensaje = "Fallo la busqueda de dispositivos";
Toast.makeText(getApplicationContext(), mensaje, Toast.LENGTH_SHORT).show();
}
}
//Reciever for found device
private final BroadcastReceiver FoundDReciever = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
discoveredDevices.add(bluetoothDevice.getName() + "\n" + bluetoothDevice.getAddress());
}
}
};
//Brings up the imageviews, to control the robot
public void btControl(View view) {
if (!BT.isEnabled()) {
mensaje = "Activate bluetooth to use control";
Toast.makeText(getBaseContext(), mensaje, Toast.LENGTH_SHORT).show();
} else {
FoundD.setVisibility(Gone);
btBUp.setVisibility(Visible);
btBDown.setVisibility(Visible);
btBLeft.setVisibility(Visible);
btBRigth.setVisibility(Visible);
btBStop.setVisibility(Visible);
}
}
public void btUp(View view) {
if(BT.isEnabled()){
String w = "w";
conectar.write(w);
Toast.makeText(getBaseContext(), w, Toast.LENGTH_SHORT).show();
}else{
mensaje = "make sure you have \nan active bluetooth connection";
}
}
public void btDown(View view) {
if(BT.isEnabled()){
String s = "s";
conectar.write(s);
Toast.makeText(getBaseContext(), s, Toast.LENGTH_SHORT).show();
}else{
mensaje = "make sure you have \n" +
"an active bluetooth connection";
}
}
public void btLeft(View view) {
if(BT.isEnabled()){
String a = "a";
conectar.write(a);
Toast.makeText(getBaseContext(), a, Toast.LENGTH_SHORT).show();
}else{
mensaje = "make sure you have \n" +
"an active bluetooth connection";
}
}
public void btRigth(View view) {
if(BT.isEnabled()){
String d = "d";
conectar.write(d);
Toast.makeText(getBaseContext(), d, Toast.LENGTH_SHORT).show();
}else{
mensaje = "make sure you have \n" +
"an active bluetooth connection";
}
}
public void btStop(View view) {
if(BT.isEnabled()){
String q = "q";
conectar.write(q);
Toast.makeText(getBaseContext(), q, Toast.LENGTH_SHORT).show();
}else{
mensaje = "make sure you have \n" +
"an active bluetooth connection";
}
}
@Override
protected void onResume() {
super.onResume();
// Register the BroadcastReceiver for ACTION_FOUND
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(FoundDReciever, filter);
}
@Override
protected void onPause() {
super.onPause();
this.unregisterReceiver(FoundDReciever);
}
//Star onCreate
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_serach_devices);
btBUp = (ImageButton) findViewById(R.id.btUp);
btBDown = (ImageButton) findViewById(R.id.btDown);
btBRigth = (ImageButton) findViewById(R.id.btRight);
btBLeft = (ImageButton) findViewById(R.id.btLeft);
btBStop = (ImageButton) findViewById(R.id.btStop);
FoundD = (ListView) findViewById(R.id.btFoundD);
discoveredDevices = new ArrayAdapter(this, 安卓.R.layout.simple_list_item_1);
Descubrir();
FoundD.setAdapter(discoveredDevices);
FoundD.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String itemValue = (String) FoundD.getItemAtPosition(position);
String MAC = itemValue.substring(itemValue.length() - 17);
BluetoothDevice bluetoothDevice = BT.getRemoteDevice(MAC);
if (BT.isEnabled()) {
conectar = new ConexionABluetooth(bluetoothDevice);
conectar.start();
} else if (!BT.isEnabled()) {
mensaje = "Bluetooth is not activated";
Toast.makeText(getBaseContext(), mensaje, Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_serach_devices, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
////////////////////////////////////////////////////////////////////////////////
public class ConexionABluetooth extends Thread {
public OutputStream btOutputStream = null;
private BluetoothDevice btShield;
public BluetoothSocket mySocket = null;
private UUID SPP_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
public ConexionABluetooth(BluetoothDevice bluetoothShield) {
btShield = bluetoothShield;
try {
mySocket = btShield.createRfcommSocketToServiceRecord(SPP_UUID);
try {
BT.cancelDiscovery();
mySocket.connect();
try {
btOutputStream = mySocket.getOutputStream();
mensaje = "Output catched";
Toast.makeText(getBaseContext(), mensaje, Toast.LENGTH_SHORT).show();
} catch (IOException e) {
Log.e("ConnectToBluetooth", "Error when getting output Stream");
}
} catch (IOException e) {
Log.e("ConnectToBluetooth", "Error with Socket Connection");
}
} catch (IOException e) {
Log.e("ConnectToBluetooth", "Error with Socket Creation");
try {
mySocket.close();
} catch (IOException closeException) {
Log.e("ConnectToBluetooth", "Error Closing socket");
}
return;
}
}
@Override
public void run() {
Log.d("fail to send", "...In onPause()...");
if (btOutputStream != null) {
try {
btOutputStream.flush();
} catch (IOException e) {
Log.d("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
}
}
try {
mySocket.connect();
} catch (IOException connectException) {
try {
mySocket.close(); //try to close the socket
} catch (IOException closeException) {
}
return;
}
}
public void write(String str) {
try {
byte[] sd = str.getBytes();
mensaje = "Message send";
Toast.makeText(getBaseContext(), mensaje, Toast.LENGTH_SHORT).show();
btOutputStream.write(sd);
} catch (IOException e) {
Log.e("Writing to Stream", "Error when writing to btOutputStream");
}
}
public void cancel() {
try {
mySocket.close();
} catch (IOException e) {
}
}
}
}
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