尝试与BluetoothGatt连接时回调中未处理的异常 [英] Unhandled exception in callback while trying to connect with BluetoothGatt
问题描述
我正在尝试连接到外围设备.当我在Scancallback中找到所需的设备时，我会将该设备的消息发送给我的处理程序.
I am trying to connect to a peripheral. When I find the device I want in Scancallback I send a message with the device to my handler.
11-16 10:31:12.471 25907-25907/I/BleManager: START SCAN
11-16 10:31:12.471 25907-25907/ D/BluetoothAdapter: startLeScan(): null
11-16 10:31:12.481 25907-25918/ D/BluetoothAdapter: onClientRegistered() - status=0 clientIf=5
11-16 10:31:12.731 25907-25918/ W/BleOlderScanCallback: Try to connect device
11-16 10:31:12.731 25907-25907/ I/BleManager: STOP SCAN
11-16 10:31:12.731 25907-25907/ D/BluetoothAdapter: stopLeScan()
11-16 10:31:12.741 25907-25907/ I/BleManager: connect device
11-16 10:31:12.741 25907-25907/ I/Runnable: connectGatt
11-16 10:31:12.741 25907-25907/ D/BluetoothGatt: connect() - device: [hidden], auto: false
11-16 10:31:12.741 25907-25907/ D/BluetoothGatt: registerApp()
11-16 10:31:12.741 25907-25907/ D/BluetoothGatt: registerApp() - UUID=[hidden]
11-16 10:31:12.751 25907-25919/ D/BluetoothGatt: onClientRegistered() - status=0 clientIf=5
11-16 10:31:15.441 25907-25918/ D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=5 device=[hidden]
11-16 10:31:15.441 25907-25918/ W/BluetoothGatt: Unhandled exception in callback java.lang.NullPointerException
at android.bluetooth.BluetoothGatt$1.onClientConnectionState(BluetoothGatt.java:168)
at android.bluetooth.IBluetoothGattCallback$Stub.onTransact(IBluetoothGattCallback.java:71)
at android.os.Binder.execTransact(Binder.java:404)
at dalvik.system.NativeStart.run(Native Method)
这是我的代码:
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
public class BleOlderScanCallback implements BluetoothAdapter.LeScanCallback {
private static final String TAG = BleOlderScanCallback.class.getSimpleName();
private static final int START_BYTE_I = 2;
private static final int MAC_BYTE_I = 7;
private static final int MAC_SIZE = 6;
private Handler handler;
private String mac;
public BleOlderScanCallback(Handler handler, String mac) {
this.handler = handler;
this.mac = mac;
}
protected void onResult(BluetoothDevice device, byte[] scanRecord){
byte[] macBytes;
String mac;
if (device != null && scanRecord != null) {
macBytes = new byte[MAC_SIZE];
System.arraycopy(scanRecord, MAC_BYTE_I, macBytes, 0, MAC_SIZE); // copy MAC_SIZE positions (since index MAC_BYTE_I) of array scanRecord to array mac
mac = formatMAC(macBytes);
Logg.i(TAG, mac + " device: " + device.getName());
if (this.mac.equals(mac)) {
Logg.w(TAG, "Try to connect device");
handler.obtainMessage(BleHandler.SCANNED_DEVICE, device).sendToTarget();
}
else{
Logg.i(TAG, "Other mac ");
}
}
}
/**
* API lower Lollipop (21)
* @param device
* @param rssi
* @param scanRecord
*/
@Override
public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {
onResult(device, scanRecord);
}
}
这是我的经理.它调用我的经理班来连接BluetoothGatt
Here is my handler. It calls my manager class to connect BluetoothGatt
public class BleHandler extends Handler {
private static final String TAG = BleHandler.class.getSimpleName();
public static final int SCANNED_DEVICE = 1;
private BleManager bleManager; // should I use WeakReference?
public BleHandler (BleManager bleManager){
this.bleManager = bleManager;
}
@Override
public void handleMessage(Message message){
BluetoothDevice device;
switch (message.what){
case SCANNED_DEVICE:
bleManager.stopBtScan();
device = (BluetoothDevice) message.obj;
bleManager.connect(device);
break;
}
}
}
在我的经理类中，connect方法如下:
And in my manager class, connect method looks like this:
public void connect(final BluetoothDevice device){
Logg.i(TAG, "connect device");
if (device == null){
Logg.i(TAG, "device to connect is null");
return;
}
Handler handler = new Handler(context.getMainLooper());
handler.post(new Runnable() {
@Override
public void run() {
Logg.i("Runnable", "connectGatt");
bluetoothGatt = device.connectGatt(context, false, bluetoothGattCallback);
}
});
}
我覆盖了BluetoothGatt.onConnectionStateChange，但是执行未到达此处
I override BluetoothGatt.onConnectionStateChange, but execution dont arrive here
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
public class BleGattCallback extends BluetoothGattCallback {
private static final String TAG = BleGattCallback.class.getSimpleName();
private int connectionState = STATE_DISCONNECTED;
protected static final int STATE_DISCONNECTED = 0;
protected static final int STATE_CONNECTING = 1;
protected static final int STATE_CONNECTED = 2;
// public static final String ACTION_GATT_CONNECTED = "com.example.bluetooth.le.ACTION_GATT_CONNECTED";
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status,
int newState) {
Logg.i(TAG, "onConnectionStateChange");
try {
super.onConnectionStateChange(gatt, status, newState);
if (newState == BluetoothProfile.STATE_CONNECTED) {
connectionState = STATE_CONNECTED;
Logg.w(TAG, "Connected to GATT server");
Logg.i(TAG, "Attempting to start service discovery:" + gatt.discoverServices());
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
connectionState = STATE_DISCONNECTED;
Logg.w(TAG, "Disconnected from GATT server.");
try {
gatt.close();
} catch (Exception e) {
Logg.d(TAG, "close ignoring: " + e);
}
}
}catch(NullPointerException e){
Logg.i(TAG, "NullPointerException onConnectionStateChange");
}
}
}
我在这里在尝试断开连接时在stackoverflow中看到了类似的错误，解决方案是不立即在gatt.disconnect之后调用gatt.close()，但这是一个不同的问题，我无法解决.我是使用蓝牙LE进行编程的新手，并且停留在这一部分.
I saw here in stackoverflow a similar error when trying to disconnect and that the solution was to not call gatt.close() right after gatt.disconnect, but this is a diffent problem and I couldn't resolve it. I'm new programming with Bluetooth LE and am stuck in this part.
推荐答案
我刚刚发现了问题.这是一个愚蠢的事情，我正在用空的bluetoothGattCallback调用device.connect.写下问题确实对我有帮助，我在这个问题上真是个烦人的日子.
I just found the problem. It was a stupid thing, I was calling device.connect with a null bluetoothGattCallback. Writing the question really helped me, I was a hole day in this issue.
这篇关于尝试与BluetoothGatt连接时回调中未处理的异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
