获取GATT Android中BLE特性的价值

Question

I am Trying to read the characteristics and get its value using the following code

private byte[] val;

mBluetoothLeService.readCharacteristic(characteristic);// reads it
val=characteristic.getValue();
String s=new String(val);

My app crashes giving error "The application may be doing too much work on its main thread."

I have also tried

private String s;
 mBluetoothLeService.readCharacteristic(characteristic);// reads it
    s=characteristic.getStringValue(0);

but the error is same

I have debugged my code to check if its getting the value

private String s;
     mBluetoothLeService.readCharacteristic(characteristic);// reads it
        s=characteristic.getStringValue(0);
    system.out.println(s);

which displays the correct value but on Running the code as Android App. I get the same error.

Answer 1

If i remember correctly this might be because you are doing too much work on your main thread, you should do heavy processing in a separate Thread or by using a Runnable or an AsyncTask. This SO question might help you.

Answer 2

when you call Read can get the characterstic from BluetoothGattCallback

BluetoothGattCallback mCallback=new BluetoothGattCallback() {

    public void onCharacteristicRead(BluetoothGatt gatt, 
            BluetoothGattCharacteristic characteristic, int status) {

    };
};