Android reading array returned from php

Question

I am reading a php response in an android method.

PHP

 if(mysqli_num_rows($result)>0) {
        $status = "Success!";
        echo "Success!";
    } else {
        echo "Login failed";
    }

Android

@Override
    protected void onPostExecute(String result) {
        if(result.equals("Success!")) {
            Toast.makeText(context, "Login Successful!", Toast.LENGTH_LONG).show();
            Intent goToWelcomePage = new Intent(context, welcome.class);
            context.startActivity(goToWelcomePage);
        } else if (result.equals("User Created")){
            Toast.makeText(context, "User Created.  Login Now.", Toast.LENGTH_LONG).show();
            Intent goToLoginPage = new Intent(context, MainActivity.class);
            context.startActivity(goToLoginPage);
        } else {
            Toast.makeText(context, result, Toast.LENGTH_LONG).show();
        }
    }

The above script is working without any trouble.

However, I want to read an array of results.I tried this in PHP.

$status = array();

if(mysqli_num_rows($result)>0) {
    $status = "Success!";
    echo json_encode(array("result"=>$status,"name"=>$username));   
} else {
    $status = "Login failed";
    echo json_encode(array("result"=>$status));
}

Not sure how to read this in Android. Besides, I am not sure if the above php is the right way to return results to android.

the php part is irrelevant. You may want to edit your question to include the json response your server is returning for this call — TooManyEduardos
– TooManyEduardos, Commented Dec 25, 2019 at 6:19

Library545 · Accepted Answer · 2019-12-25 07:01:45Z

1

No problem in the PHP code, at least it can return a correct json as you expected if what you want is:

{"result":"Success!","name":"YOUR_LOGIN_NAME"}

or

{"result":"Login failed"}

In Android, you should use a json parser library to parser the "result" such as Gson(https://github.com/google/gson).

you can create a response class like:

class MyResponse {
    String result;
    String name;
}

then you can simply call in your code:

@Override
protected void onPostExecute(String result) {
    Gson gson = new Gson();
    MyResponse response = gson.fromJson(result, MyResponse.class);
    switch (response.result) {
        case "Success!":
            // do something when login success
            // can call response.name here to read the login name
            break;
        case "Login failed":
            // do something when login failed
            break;
        // and more...
    }

And if you are interested in a modern HTTP client, you can have a look:
okhttp (https://github.com/square/okhttp)
retrofit (https://github.com/square/retrofit)

answered Dec 25, 2019 at 7:01

Library545

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1 Comment

Apricot Over a year ago

Thank you...your code helped. I made couple of changes to suit my requirement.

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