Aastha's Knowledge Dump

  To debug the behavior of your application while an accessory is plugged in, you can't use ADB through a USB cable. In this case, to debug applications, you need to link your device to ADB over Wi-Fi. Steps to configure the ADB connection over Wi-Fi Connect the device and the computer to the same Wi-Fi network. If the computer is connected to VPN, disconnect from it. The device can be on VPN. Plug the device into the computer with a USB cable to configure the connection On the computer command line type:  adb tcpip 5555 On the computer command line type:  adb shell ip addr show wlan0  and copy the IP address after the "inet" until the "/". You can also go inside the Settings of the device to retrieve the IP address in Settings → About → Status. On the computer command line type:  adb connect ip-address-of-device:5555 You can disconnect the USB cable from the device and check with  adb devices  that the device is still detected. adb over wifi

This tutorial is based on https://www.apollographql.com/docs/apollo-server/getting-started/  Install node and npm. If you don't have them installed do the following 1 and 2:     1. Install homebrew from  https://brew.sh/     2. Install node and npm using homebrew Create a new folder named graphql-server-example cd into it. setup node project using the command: npm init --yes This creates a package.json file. Install apollo-server and graphql   using: npm install apollo-server graphql Create an empty index.js file with command touch index.js Add the following content to the file: const { ApolloServer , gql } = require ( 'apollo-server' ); // A schema is a collection of type definitions (hence "typeDefs") // that together define the "shape" of queries that are executed against // your data. const typeDefs = gql ` # Comments in GraphQL strings (such as this one) start with the hash (#) symbol. # This "Book" type defines the queryable field

 Asynchronous programming in Android can be done in various ways. Two of them are: 1. Using callback 2. Using coroutines Below is the example of using callback: Below is the example of using coroutine: ... Note that suspend function can only be called either from a  coroutine or from another suspend function. Here GlobalScope implements CoroutineScope and launch is a coroutine builder which is an extension function of CoroutineScope. Coroutine A  coroutine  is an instance of suspendable computation. It is conceptually similar to a thread, in the sense that it takes a block of code to run that works concurrently with the rest of the code. However, a coroutine is not bound to any particular thread. It may suspend its execution in one thread and resume in another one. Coroutines can be thought of as light-weight threads // Sequentially executes doWorld followed by "Hello" fun main() = runBlocking {     doWorld()     println("Done") } // Concurrently executes both