I am developing the Bluetooth connection program with Android 2.1 SDK.
Since devices which have not connected are also contained, this program
requires time for search. Although I would like to filter and test only
actually connected devices, is there any method?
And this is a general question. In my smart phone, even if it inserts
sleep() in this code, ProgressDialog is not displayed. Is there any mistake
in this code?
public class BluetoothActivity extends Activity
{
private static final int REQUEST_ENABLE_BT = 2000;
private BluetoothAdapter ba;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView tv = (TextView)findViewById(R.id.textview);
ba = BluetoothAdapter.getDefaultAdapter();
if(ba == null) {
tv.setText("There is no Bluetooth adapter.");
return;
}
if(ba.isEnabled() == false){
Intent i = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(i, REQUEST_ENABLE_BT);
}else{
ConnectBluetooth();
}
}
private void ConnectBluetooth()
{
BluetoothSocket sock = ConnectBluetooth2();
if(sock == null){
AlertDialog.Builder alertDlg = new AlertDialog.Builder(this);
alertDlg.setTitle("Error");
alertDlg.setMessage("Connection failed");
alertDlg.setPositiveButton(
"Retry",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
ConnectBluetooth();
}
});
alertDlg.setNegativeButton(
"Exit",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
alertDlg.create().show();
}else{
try{
InputStream in = sock.getInputStream();
OutputStream out = sock.getOutputStream();
}catch(IOException e){
Log.e("BTEST", "Transfer error", e);
}
}
}
private static final UUID MY_UUID =
UUID.fromString("D6ED8549-67BD-4136-9213-0A8DE9DCB9EA");
private BluetoothSocket ConnectBluetooth2()
{
ProgressDialog cdlg = ProgressDialog.show(this, "Connecting",
"Please wait...");
// It takes time, in order that the devices which have not
connected may also search.
BluetoothSocket btsock = null;
if(ba.isDiscovering()) ba.cancelDiscovery();
Set<BluetoothDevice> devs = ba.getBondedDevices();
if (devs.size() > 0) {
for (BluetoothDevice d : devs) {
try{
btsock = d.createRfcommSocketToServiceRecord(MY_UUID);
btsock.connect();
}catch(Exception e){
btsock = null;
}
if(btsock != null) break;
}
}
cdlg.dismiss();
return btsock;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent
data)
{
switch(requestCode){
case REQUEST_ENABLE_BT:
switch(resultCode){
case Activity.RESULT_OK:
ConnectBluetooth();
break;
default:
Toast t = Toast.makeText(this, "Connection is cancelled.",
Toast.LENGTH_SHORT);
t.show();
finish();
break;
}
}
}
}
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