如何在 Android 中将 BluetoothGatt 和 Characteristic 传递给 AsyncTask？

Question

我想用AsyncTask实现mGatt.writeCharacteristic。

起初，我尝试将 mBluetoothGatt 和 BluetoothGattCharacteristic 传递给 AsyncTask，就像下面的代码一样。

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) {
    }
}

但是我不知道如何验证 AsyncTask<String, Void, String> 的参数。我试过 AsyncTask<BluetoothGatt, Void, String> ，但它有错误。

如何在Android中将BluetoothGatt和Characteristic传递给AsyncTask？

Answer 1

在您的 AsyncTask 中编写您自己的构造函数。像这样：

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) {
}
}

你可以这样称呼它：

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

Answer 2

AsyncTasks 不太好用，因为在配置更改时它们会消失，但这是你可以做的

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) {
    }
}

如何在 Android 中将 BluetoothGatt 和 Characteristic 传递给 AsyncTask？

How to pass BluetoothGatt and Characteristic to AsyncTask in Android?

android

android-asynctask

bluetooth-lowenergy