如何在Android中将BluetoothGatt和Characteristic传递给AsyncTask？

Question

I want to use AsyncTask to implement mGatt.writeCharacteristic .

At first , I try to pass mBluetoothGatt and BluetoothGattCharacteristic to AsyncTask like the following code.

private static BluetoothGatt mBluetoothGatt;
BluetoothGattCharacteristic HueCharacteristic;

new WriteCharacteristic().execute(mBluetoothGatt , HueCharacteristic);
private class WriteCharacteristic extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... urls) {

        BluetoothGatt gatt = params[0];
        BluetoothGattCharacteristic characteristic = params[1]; 
        return null;
    }
    // onPostExecute displays the results of the AsyncTask.
    @Override
    protected void onPostExecute(String result) {
    }
}

But I don't know how to verify the param at AsyncTask<String, Void, String> . I have try AsyncTask<BluetoothGatt, Void, String> , but it has error.

How to pass BluetoothGatt and Characteristic to AsyncTask in Android ?

Answer 1

Write your own constructor in your AsyncTask. Like this:

private class WriteCharacteristic extends AsyncTask<String, Void,String> {
public WriteCharacteristic(String a, int b) {
    //do something with the variables. Save them, whatever
}

@Override
protected String doInBackground(String... urls) {
    return null;
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
}
}

And you can call it this way:

new WriteCharacteristic("a",1).execute();

Answer 2

AsyncTasks not too great to use since on config change they go away butt here is what you can do

private BluetoothGatt mBluetoothGatt;
BluetoothGattCharacteristic HueCharacteristic;

public MyDataObject {
    public MyDataObject(BluetoothGatt gatt, BluetoothGattCharacteristic, ch) {
         this.gatt = gatt; this.ch = ch;
    public BluetoothGatt gatt;
    public BluetoothGattCharacteristic ch;
}


new WriteCharacteristic().execute(new MyDataObject(mBluetoothGatt, HueCharacteristic));
private class WriteCharacteristic extends AsyncTask<MyDataObject , Void, String> {
    @Override
    protected String doInBackground(MyDataObject... data) {

        return null;
    }
    // onPostExecute displays the results of the AsyncTask.
    @Override
    protected void onPostExecute(String result) {
    }
}