i have two problem.I want connect my ble service .I can connect but i cant disconnect serive when i use mService.disconnect(); my app will crash.and other problem is i cant send value to RXchar......
All problem are dispaly on a null object reference
this is disconnect error
RxChar error
my code _ble_fragment
switch1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
try {
//send data to service
if (isChecked) {
message = "1";
} else {
message = "0";
}
value = message.getBytes("UTF-8");
sendText.setText(message);
mService.writeRXCharacteristic(value);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
scanButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.i("click", "按下去了");
if (!mBtAdapter.isEnabled()) {
Log.i(TAG, "onClick - BT not enabled yet");
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
} else {
if (scanButton.getText().equals("Connect")) {
Log.i("scan", "open device");
switch1.setEnabled(true);
//Connect button pressed, open DeviceListActivity class, with popup windows that scan for devices
Intent newIntent = new Intent(getActivity(), DeviceListActivity.class);
startActivity(newIntent);
} else {
//Disconnect button pressed
mService.disconnect();
Log.i("Diconnect", "Disconnect Ble");
// mHandler.removeCallbacks(runnable);
}
}
}
});
DeviceList & UartService code:
public void writeGatt(BluetoothDevice dev){
byte[] msgBuffer; //bluetooth send alway byte
String message = "1"; //ON
msgBuffer = message.getBytes();
mBtGatt = dev.connectGatt(this,false,GattCallback);//call Gattcallback
}
private final BluetoothGattCallback GattCallback = new BluetoothGattCallback() { //
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
String intentAction;
if (newState == BluetoothProfile.STATE_CONNECTED) {
intentAction = ACTION_GATT_CONNECTED;
broadcastUpdate(intentAction);
Log.i(TAG, "Connected to GATT server.");
Log.i(TAG, "Attempting to start service discovery:" +
mBtGatt.discoverServices());
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
intentAction = ACTION_GATT_DISCONNECTED;
broadcastUpdate(intentAction);
Log.i(TAG, "Disconnected from GATT server.");
}
}
@Override
// New services discovered
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
} else {
Log.w(TAG, "onServicesDiscovered received: " + status);
}
}
@Override
// Result of a characteristic read operation
public void onCharacteristicRead(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic,
int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
//broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
}
}
};
public void disconnect() { //deisconnect
if (mBtGatt == null) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
mBtGatt.close();
mBtGatt = null;
// mBluetoothGatt.close();
}
private void broadcastUpdate(final String action) {
final Intent intent = new Intent(action);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
Log.i("broadcastUpdate", "run broadcastUpdate send " + intent);
}
public void close() {
if (mBtGatt == null) {
return;
}
Log.w(TAG, "mBluetoothGatt closed");
;
mBtGatt.close();
mBtGatt = null;
}
public void writeRXCharacteristic(byte[] value)
{
/* BluetoothGattService RxService = mBtGatt.getService(RX_SERVICE_UUID);
//showMessage("mBluetoothGatt null"+ mBluetoothGatt);
if (RxService == null) {
//showMessage("Rx service not found!");
// broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART);
Log.i("RxService is null!!","RxService is null!!");
return;
}
BluetoothGattCharacteristic RxChar = RxService.getCharacteristic(RX_CHAR_UUID);
if (RxChar == null) {
// showMessage("Rx charateristic not found!");
//broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART);
Log.i("RxCHAR is null!!","RxCHAR is null!!");
return;
}
RxChar.setValue(value);
boolean status = mBtGatt.writeCharacteristic(RxChar);
Log.d(TAG, "write TXchar - status=" + status);*/
BluetoothGattService RxService=null;
while( RxService==null) {
try{
RxService = mBtGatt.getService(RX_SERVICE_UUID);}
catch(Exception e){
Log.d(TAG, e.toString());}
}
if (RxService == null) {
Log.d(TAG, "1");
return;
}BluetoothGattCharacteristic RxChar=null;
while( RxChar ==null){
try{
RxChar = RxService.getCharacteristic(RX_CHAR_UUID);}
catch(Exception e)
{Log.d(TAG, e.toString());}
}
if (RxChar == null) {
Log.d(TAG, "2");
return;
}
RxChar.setValue(value);
mBtGatt.writeCharacteristic(RxChar);
}
what can i do?
