API 19 and Bluetooth Low Energy

Question

I am currently working on a project to connect a Google Glass Explorer Edition (Android Kitkat and therefore API 19) to an Arduino board emitting data in BLE.

I have checked that this is possible and I have found and installed an APK that manages to make the link. However, I want to make a slightly different application.

The application I want to make has a splash screen and a main activity displaying the different values on TextView. This part is already working.

Splash Screen:

package com.example.flyin_glass;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import androidx.appcompat.app.AppCompatActivity;

public class SplashScreenActivity extends AppCompatActivity {
/* JADX INFO: Access modifiers changed from: protected */
@Override // androidx.fragment.app.FragmentActivity, androidx.activity.ComponentActivity, androidx.core.app.ComponentActivity, android.app.Activity
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash_screen);
    Runnable runnable = new Runnable() { // from class: com.example.myapplication.SplashScreenActivity.1
        @Override // java.lang.Runnable
        public void run() {
            Intent intent = new Intent(SplashScreenActivity.this.getApplicationContext(), MainActivity.class);
            SplashScreenActivity.this.startActivity(intent);
            SplashScreenActivity.this.finish();
        }
    };
    new Handler().postDelayed(runnable, 3000L);
}
}

Main activity :

package com.example.flyin_glass;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.*;
import android.bluetooth.le.*;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.content.Context;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity
{


@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

}

My goal would be to code (in main activity) the management of the BLE, ie the automatic connection to my Arduino (which has a specific UUID) as well as the data retrieval and display in TextView.

Being a novice in Android development, the task of managing the BLE is very complex for me. Do you have any advice?

Thank you in advance.

Guillaume

Answer 1

As Michael Kotzjan mentioned, there are many Android BLE tutorials which can you help you with this task. Below are some of my faviourites:-

• The ultimate guide to Android BLE development
• BLE Programming in Android: The complete tutorial
• Building Android apps to control BLE devices

However, your main issue is that you are using API 19, which is a very dated Android API (I believe BLE functionality was introduced in API 18) and the BLE API has changed since then. As such I would see the link below on recommendation on how to overcome this issue and also keep a lookout for the API discrepencies throughout your development.

• Which target SDK to use for Android BLE development