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Bluetooth Code for Android Application (Java) - ThePoorEngineer
10/01/ · The source code in Java is here in case some of you need it again!. The code uploaded here is for Android phones and you will need to have the Android Studio downloaded to do this project. The code enables the phone to establish communication with the Bluetooth module that is connected to the Arduino to set the clock timing, and also to set/delete blogger.comted Reading Time: 11 mins Using Bluetooth, Android devices can create personal area networks to send and receive data with nearby Bluetooth devices. In Android and later, the Android Bluetooth stack provides the ability to implement Bluetooth Low Energy (BLE) Android bluetooth example code download. Android is one of the most popular operating systems for mobile You can base BluetoothChat example to send the data over. If you look at the code, text message string is converted to byte[] before being sent over bluetooth. So convert your data to byte[] and then send it over. – Win Myo Htet Nov 22 '13 at
Android bluetooth example code download
The source code in Java is here in case some of you need it again! The code uploaded here is for Android phones and you will need to have the Android Studio downloaded to do this project. However, it does not include the Graphic User Interface as I felt that the GUI design would be easier if it was done personally on the Android Studio SDK. This code has quite a few parts to it and is pretty long but I hope it will be helpful for you guys out there!
The MainActivity. java is the code that will be run first when the Application is opened. The onCreate function then initializes all the variables and also connects the buttons Signals to their respective actions Slots. You can think of this as the background processes while the application is open. The first part of the code creates a variable to represent the items present on the GUI. For example, android bluetooth example code download, statusText is a variable to represent the TextView gadget with ID StatusText on the GUI.
The setOn… functions then connect the respective gadgets to the functions stated. For example, when the enableBluetooth button is clicked, btnEnableBluetoothOnClickListener function will be activated.
The connectSystem button is set to disabled thereafter because the user need to search for a valid Bluetooth device before connection is possible. There will be a lot of this kind of setting later on as well, and in my opinion, it is these idiot-proof measures that makes making GUIs complicated. Moving on, we call the Android API, getDefaultAdapterto determine the Bluetooth adapter that the phone is using. The next line is probably the solution to the problem that most of you will have if you have upgraded your phone to Marshmallow.
Because of this, we have to ask for permission during runtime to scan for Bluetooth devices. The codes in line 25 ~ 44 does this and it should solve the problem of runtime permission for your application.
The CheckAndEnableBlueToothState is a custom function that I made to simplify the code. Below shows its content. If bluetoothAdapter is null at this point, it usually means that the phone does not support Bluetooth. If this is the case, there is nothing we can do except to exit the application.
In the else section when a bluetooth adapter has been found, we call the Android API to check if the user has enabled Bluetooth on his phone. If yes, we proceed to check if the bluetooth adapter is currently scanning for devices just in case the user was scanning for devices beforehand. The last part of the onCreate function creates an intent filter for the bluetoothAdapter. We add in all the possible actions of android bluetooth example code download Bluetooth adapter and then register the actions to the receiver named ActionFoundReceiver.
This is done so that we will be notified whenever there is a change in the Bluetooth adapter state, such as when the user suddenly turn off his Bluetooth while using the application. When the application starts, the android bluetooth example code download will usually have to press to scan for the Bluetooth devices in the surrounding areas. I made a toggle button called scanBluetooth for this so that when the device is scanning, the button will be toggled on, and android bluetooth example code download the scan is over, the button will be toggled off automatically.
The code above checks for changes in the toggled state of the button. When the scanBluetooth button is toggled on, it will first check if permission was granted by the user, android bluetooth example code download, then attempt to scan for devices in the neighborhood.
On the other hand, if the button is toggled off, it will cancel the scanning android bluetooth example code download immediately. These make up the main part of the code in MainActivity. The rest of the code in the file deals with all the different permutations of the buttons in the GUI.
The code above comes from the MainActivity. java file. When the user clicks the connectBluetooth button, we need to start another thread in the background to do this job so that the GUI does not freeze in the process.
In order to do this, I created a new thread called ConnectThread. The thread is first initialized in line 5 using the new keyword, android bluetooth example code download. The definition of the ConnectThread bluetoothDevice, bluetoothAdapter function is in the ConnectThread. java file so please view it there if you need more details.
When the thread is first created, it will attempt to create a socket for the Bluetooth connection. Then in line 6, the system will attempt to connect to the device through the socket created. Remember the IntentFilter we set for the BluetoothDevice in the MainActivity. When the Bluetooth connection is successful, it will trigger ActionFoundReceiver. The code above basically deals with all the different cases of connections. When we start the PlantWateringActivity activity, the onCreate function is called.
We override it here to include our variables from the new GUI once again. The waterSwitch is an on-off switch on the GUI which sends the command to the Arduino for the motor to turn the tap on and off. We then start a new Thread again so that all the background process of communicating is done on a separate thread, android bluetooth example code download.
This new Thread is called the ConnectedThread and it can be found in the ConnectedThread. Please take a look at the file if you need more information. There are lots of comments there so I think it is relatively simple to understand. The rest of the code in the PlantWateringActivity. java file deals with sending and receiving messages. For me, I used the first character in the transmission to indicate the information that follows. For example, take at the code below which can be found in the setSystemTime View view function.
Likewise, in the setWateringTime View view function, numberPicker. getValue returns a value of 1 to 5 inclusive which is tells the Arduino the respective timer to set the alarm information that follows after the numberPicker. getValue number.
In the same manner, when the Arduino sends messages to the phone, the first character tell the system what the following data contains. With this, we are done on the Android Side so lets move to the Arduino Code!
Skip to content. java Override protected void onCreate Bundle savedInstanceState { super, android bluetooth example code download. onCreate savedInstanceState ; setContentView R. setAdapter btArrayAdapter ; enableBluetooth. setOnClickListener btnEnableBluetoothOnClickListener ; scanBluetooth. setOnCheckedChangeListener btnScanDeviceOnCheckedListener ; connectSystem. setOnClickListener btnConnectOnClickListener ; connectSystem.
getDefaultAdapter ; if Build. checkSelfPermission getBaseContextManifest. Builder this. setTitle "Runtime Permissions up ahead". setMessage "Permission is needed to scan for bluetooth devices". setPositiveButton "Okay", new DialogInterface. OnClickListener { public void onClick DialogInterface dialog, int which { if ContextCompat. requestPermissions MainActivity. this, new String[]{Manifest. setIcon android. show ; break; case PackageManager. addAction BluetoothDevice. addAction BluetoothAdapter.
setText "Bluetooth NOT supported by phone" ; new AlertDialog. setTitle "Not compatible". setMessage "Your phone does not support Bluetooth". setPositiveButton "Exit", new DialogInterface. OnClickListener { public void onClick DialogInterface dialog, int which { System.
show ; } else { if bluetoothAdapter. isEnabled { listPairedDevices ; if bluetoothAdapter. isDiscovering { statusText.
setText android bluetooth example code download is currently in device discovery process. setChecked true ; } else { statusText. setText "Bluetooth is Enabled. setEnabled false ; scanBluetooth. setEnabled true ; scanBluetooth. setChecked false ; } } else { statusText. setText "Bluetooth is Disabled. setChecked false ; scanBluetooth. setEnabled false ; connectSystem.
Developing Bluetooth Smart Applications for Android Tutorial
, time: 36:40Android bluetooth example code download
10/01/ · The source code in Java is here in case some of you need it again!. The code uploaded here is for Android phones and you will need to have the Android Studio downloaded to do this project. The code enables the phone to establish communication with the Bluetooth module that is connected to the Arduino to set the clock timing, and also to set/delete blogger.comted Reading Time: 11 mins You can base BluetoothChat example to send the data over. If you look at the code, text message string is converted to byte[] before being sent over bluetooth. So convert your data to byte[] and then send it over. – Win Myo Htet Nov 22 '13 at Using Bluetooth, Android devices can create personal area networks to send and receive data with nearby Bluetooth devices. In Android and later, the Android Bluetooth stack provides the ability to implement Bluetooth Low Energy (BLE) Android bluetooth example code download. Android is one of the most popular operating systems for mobile
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