Android SDK_example_app modification

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I modified the SDK_example_app as follows:

package 

import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import java.io.IOException;

import io.particle.android.sdk.cloud.ParticleCloud;
import io.particle.android.sdk.cloud.ParticleCloudException;
import io.particle.android.sdk.cloud.ParticleCloudSDK;
import io.particle.android.sdk.cloud.ParticleDevice;
import io.particle.android.sdk.utils.Async;
import io.particle.android.sdk.utils.Toaster;


public class LoginActivity extends AppCompatActivity {

    public ParticleDevice mDevice;
    // Code below has been added --------------------
    SharedPreferences sp;
    //---------------------------

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ParticleCloudSDK.init(this);
        setContentView(R.layout.login_activity);

        // Code below has been added --------------------
        sp = getSharedPreferences("login",MODE_PRIVATE);
        if(sp.getBoolean("logged",false)) {
            goToMainActivity();
        }
        //---------------------------

        if (!isTaskRoot()) {
            finish();
            return;
        }



        Button hvacButton = (Button)findViewById(R.id.loginButton);

        hvacButton.setOnClickListener(
                new Button.OnClickListener() {

                    public void onClick(View v) {
                        final String email = ((EditText) findViewById(R.id.email)).getText().toString();
                        final String password = ((EditText) findViewById(R.id.password)).getText().toString();


                        Async.executeAsync(ParticleCloudSDK.getCloud(), new Async.ApiWork<ParticleCloud, Object>() {

                            @Override
                            public Object callApi(@NonNull ParticleCloud sparkCloud) throws ParticleCloudException, IOException {
                                sparkCloud.logIn(email, password);
                                sparkCloud.getDevices();
                                try {
                                    mDevice = sparkCloud.getDevices().get(0);
                                } catch (IndexOutOfBoundsException iobEx) {
                                    throw new RuntimeException("Your account must have at least one device for this example app to work");
                                }

                                return -1;

                            }

                            @Override
                            public void onSuccess(@NonNull Object value) {
                                Toaster.l(LoginActivity.this, "Logged in");
                                Intent intent = VariablesActivity.buildIntent(LoginActivity.this, 123, mDevice.getID());
                                sp.edit().putBoolean("logged",true).apply();
                                startActivity(intent);


                            }

                            @Override
                            public void onFailure(@NonNull ParticleCloudException e) {
                                Toaster.l(LoginActivity.this, e.getBestMessage());
                                e.printStackTrace();
                                Log.d("info", e.getBestMessage());
                            }


                        });


                    }



        });



    }

    // Code below has been added --------------------
    public void goToMainActivity(){
        Toaster.l(LoginActivity.this, "Logged in");
        Intent intent = VariablesActivity.buildIntent(LoginActivity.this, 123, "?????????????????????");
        startActivity(intent);
    }
    //---------------------------
}

The code is all good but I’m looking to make two changes and need help.

  1. How would I go about displaying all the devices that I have under my account and selecting the one I want to control?

  2. I’m using the SharedPreferences to keep me signed in to the account and not have to re-login each time I open the app. The only way I was able to do this was by hard coding the deviceID in code Intent intent = VariablesActivity.buildIntent(LoginActivity.this, 123, “???”);
    Is there a way to have this change based on what I pick in Step 1?