Android bluetooth app code

Android + Pair devices via bluetooth programmatically

I want to discover bluetooth devices in range, list and pair to them on click. I used following code but its just closing application when I click on device name which I want to pair. I want to know mistake in my code or any other way to do what i need.

package com.marakana; import java.util.Set; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.Window; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.TextView; import android.widget.AdapterView.OnItemClickListener; public class BluetoothDemo extends Activity < // Debugging private static final String TAG = "DeviceListActivity"; private static final boolean D = true; // Return Intent extra public static String EXTRA_DEVICE_ADDRESS = "device_address"; // Member fields private BluetoothAdapter mBtAdapter; private ArrayAdaptermPairedDevicesArrayAdapter; private ArrayAdapter mNewDevicesArrayAdapter; @Override protected void onCreate(Bundle savedInstanceState) < super.onCreate(savedInstanceState); // Setup the window requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); setContentView(R.layout.device_list); // Set result CANCELED incase the user backs out setResult(Activity.RESULT_CANCELED); // Initialize the button to perform device discovery Button scanButton = (Button) findViewById(R.id.button_scan); scanButton.setOnClickListener(new OnClickListener() < public void onClick(View v) < doDiscovery(); v.setVisibility(View.GONE); >>); // Initialize array adapters. One for already paired devices and // one for newly discovered devices mPairedDevicesArrayAdapter = new ArrayAdapter(this, R.layout.device_name); mNewDevicesArrayAdapter = new ArrayAdapter(this, R.layout.device_name); // Find and set up the ListView for paired devices ListView pairedListView = (ListView) findViewById(R.id.paired_devices); pairedListView.setAdapter(mPairedDevicesArrayAdapter); pairedListView.setOnItemClickListener(mDeviceClickListener); // Find and set up the ListView for newly discovered devices ListView newDevicesListView = (ListView) findViewById(R.id.new_devices); newDevicesListView.setAdapter(mNewDevicesArrayAdapter); newDevicesListView.setOnItemClickListener(mDeviceClickListener); // Register for broadcasts when a device is discovered IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); this.registerReceiver(mReceiver, filter); // Register for broadcasts when discovery has finished filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); this.registerReceiver(mReceiver, filter); // Get the local Bluetooth adapter mBtAdapter = BluetoothAdapter.getDefaultAdapter(); // Get a set of currently paired devices Set pairedDevices = mBtAdapter.getBondedDevices(); // If there are paired devices, add each one to the ArrayAdapter if (pairedDevices.size() > 0) < findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE); for (BluetoothDevice device : pairedDevices) < mPairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress()); >> else < String noDevices = getResources().getText(R.string.none_paired).toString(); mPairedDevicesArrayAdapter.add(noDevices); >> @Override protected void onDestroy() < super.onDestroy(); // Make sure we're not doing discovery anymore if (mBtAdapter != null) < mBtAdapter.cancelDiscovery(); >// Unregister broadcast listeners this.unregisterReceiver(mReceiver); > /** * Start device discover with the BluetoothAdapter */ private void doDiscovery() < if (D) Log.d(TAG, "doDiscovery()"); // Indicate scanning in the title setProgressBarIndeterminateVisibility(true); setTitle(R.string.scanning); // Turn on sub-title for new devices findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE); // If we're already discovering, stop it if (mBtAdapter.isDiscovering()) < mBtAdapter.cancelDiscovery(); >// Request discover from BluetoothAdapter mBtAdapter.startDiscovery(); > // The on-click listener for all devices in the ListViews private OnItemClickListener mDeviceClickListener = new OnItemClickListener() < public void onItemClick(AdapterViewav, View v, int arg2, long arg3) < // Cancel discovery because it's costly and we're about to connect mBtAdapter.cancelDiscovery(); // Get the device MAC address, which is the last 17 chars in the View String info = ((TextView) v).getText().toString(); String address = info.substring(info.length() - 17); // Create the result Intent and include the MAC address Intent intent = new Intent(); intent.putExtra(EXTRA_DEVICE_ADDRESS, address); // Set result and finish this Activity setResult(Activity.RESULT_OK, intent); finish(); >>; // The BroadcastReceiver that listens for discovered devices and // changes the title when discovery is finished private final BroadcastReceiver mReceiver = new BroadcastReceiver() < @Override public void onReceive(Context context, Intent intent) < String action = intent.getAction(); // When discovery finds a device if (BluetoothDevice.ACTION_FOUND.equals(action)) < // Get the BluetoothDevice object from the Intent BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); // If it's already paired, skip it, because it's been listed already if (device.getBondState() != BluetoothDevice.BOND_BONDED) < mNewDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress()); >// When discovery is finished, change the Activity title > else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) < setProgressBarIndeterminateVisibility(false); setTitle(R.string.select_device); if (mNewDevicesArrayAdapter.getCount() == 0) < String noDevices = getResources().getText(R.string.none_found).toString(); mNewDevicesArrayAdapter.add(noDevices); >> > >; > 

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Simple Android Bluetooth example to turn on/off radio and to view and connect with devices. Has associated code to connect to an Arduino.

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bauerjj/Android-Simple-Bluetooth-Example

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README.md

A simple Android bluetooth example to turn on/off the radio and to view and connect with other devices. It has associated embedded firmware code to connect to an Arduino to test the bi-directional data stream.

For a complete tutorial write-up, please see here:

This is a simple demo app that creates buttons to toggle ON/OFF the bluetooth radio, view connected devices, and to discover new bluetooth enabled devices. A checkbox and status strings provide functionality to communicate with an embedded microcontroller such as an Arduino. You don’t necessarily need to connect an Arduino to still have a functioning phone application. The connected device MUST abide by the Serial Port Profile (SPP). Other complex profiles are not supported with this example and will fail to connect.

1. Android Studio IDE and SDK
2. HC-06 bluetooth module
3. Arudino Uno
4. A few breadboard wires to connect the HC-06 to the Arduino

1. Clone this repo and open it inside of Android Studio. Note, a later SDK will work just fine (SDK 23+)
2. Build the app
3. Install the app to your connected Android phone. You will need to install special drivers and enable USB debugging on your phone for this to work. There are plenty of tutorials on the web for this.
4. Clone this Arudino gist and program your Arudino
5. Run the application on your phone after it installs. Connect to the HC-06 and you should see a number incrementing on the application every second.

Please submit all issues to the github tracker. Pull requests are also encouraged. General comments can be left either inside github or at mcuhq.com.

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Simple Android Bluetooth example to turn on/off radio and to view and connect with devices. Has associated code to connect to an Arduino.

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