Save Amplify query response into local variables, android java

Thank you for reaching out to us regarding the above query.

In order to access the response outside of the Amplify.API.query callback, you can try declaring a variable outside the callback and assign the response inside it. While doing so, kindly be mindful of the asynchronous behavior. Upon researching through some third party discussion, here's an example using a CountDownLatch for synchronization:

import java.util.concurrent.CountDownLatch;


List<MerchantDevices> merchantDevices;
CountDownLatch latch = new CountDownLatch(1);

Amplify.API.query(
    ModelQuery.list(MerchantDevices.class),
    response -> {
        merchantDevices = new ArrayList<>(response.getData());
        latch.countDown(); // Signal => response is available
    },
    error -> {
        Log.e("Amplify", "Error retrieving data: " + error);
        latch.countDown(); // Ensure the latch is counted down in case of an error
    }
);
try {
    latch.await(); // Block until the response is available
    // Now you can use the 'merchantDevices' variable outside the callback
} catch (InterruptedException e) {
    e.printStackTrace();
}

Kindly test the above code in a test environment before using it in production. Additionally, you can find detailed documentation for Amplify's Android API on the documentation below:

• Amplify Android - API.

Having said that, in case you face further challenges, please feel free to open a support case with AWS using the following link.