BluetoothListDevicesActivity.java

package org.andengine.examples.util;

import java.util.Set;

import org.andengine.examples.R;

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.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

/**
 * This Activity appears as a dialog. It lists any paired devices and
 * devices detected in the area after discovery. When a device is chosen
 * by the user, the MAC address of the device is sent back to the parent
 * Activity in the result Intent.
 * 
 * (c) 2010 Nicolas Gramlich 
 * (c) 2011 Zynga Inc.
 * 
 * @author Nicolas Gramlich
 * @since 12:19:52 - 06.03.2011
 */
public class BluetoothListDevicesActivity extends Activity {
	// ===========================================================
	// Constants
	// ===========================================================
	
	public static String EXTRA_DEVICE_ADDRESS = "device_address";

	// ===========================================================
	// Fields
	// ===========================================================

	private BluetoothAdapter mBluetoothAdapter;
	private ArrayAdapter<String> mPairedDevicesArrayAdapter;
	private ArrayAdapter<String> mNewDevicesArrayAdapter;

	private final OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
		@Override
		public void onItemClick(final AdapterView<?> pAdapterView, final View pView, final int pPosition, final long pID) {
			// Cancel discovery because it's costly and we're about to connect
			BluetoothListDevicesActivity.this.mBluetoothAdapter.cancelDiscovery();

			// Get the device MAC address, which is the last 17 chars in the View
			final String info = ((TextView) pView).getText().toString();
			final String address = info.substring(info.length() - 17);

			// Create the result Intent and include the MAC address
			final Intent intent = new Intent();
			intent.putExtra(EXTRA_DEVICE_ADDRESS, address);

			// Set result and finish this Activity
			BluetoothListDevicesActivity.this.setResult(Activity.RESULT_OK, intent);
			BluetoothListDevicesActivity.this.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(final Context pContext, final Intent pIntent) {
			final String action = pIntent.getAction();

			if (action.equals(BluetoothDevice.ACTION_FOUND)) {
				final BluetoothDevice device = pIntent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
				if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
					BluetoothListDevicesActivity.this.mNewDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
				}
			} else if (action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)) {
				BluetoothListDevicesActivity.this.setProgressBarIndeterminateVisibility(false);
				BluetoothListDevicesActivity.this.setTitle("Select a device to connect...");
				if (BluetoothListDevicesActivity.this.mNewDevicesArrayAdapter.getCount() == 0) {
					BluetoothListDevicesActivity.this.mNewDevicesArrayAdapter.add("No devices found!");
				}
			}
		}
	};


	// ===========================================================
	// Constructors
	// ===========================================================

	@Override
	protected void onCreate(final Bundle pSavedInstanceState) {
		super.onCreate(pSavedInstanceState);

		this.requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
		this.setContentView(R.layout.list_bluetooth_devices);

		// Set result CANCELED in case the user backs out
		this.setResult(Activity.RESULT_CANCELED);

		final Button scanButton = (Button) this.findViewById(R.id.button_scan);
		scanButton.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(final View v) {
				BluetoothListDevicesActivity.this.discoverBluetoothDevices();
				v.setVisibility(View.GONE);
			}
		});

		this.mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
		this.mNewDevicesArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);

		final ListView pairedListView = (ListView) this.findViewById(R.id.paired_devices);
		pairedListView.setAdapter(this.mPairedDevicesArrayAdapter);
		pairedListView.setOnItemClickListener(this.mDeviceClickListener);

		final ListView newDevicesListView = (ListView) this.findViewById(R.id.new_devices);
		newDevicesListView.setAdapter(this.mNewDevicesArrayAdapter);
		newDevicesListView.setOnItemClickListener(this.mDeviceClickListener);

		// Register for broadcasts when a device is discovered
		IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
		this.registerReceiver(this.mReceiver, filter);

		// Register for broadcasts when discovery has finished
		filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
		this.registerReceiver(this.mReceiver, filter);

		this.mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

		// Get a set of currently paired devices
		final Set<BluetoothDevice> pairedDevices = this.mBluetoothAdapter.getBondedDevices();
		if (pairedDevices.size() > 0) {
			this.findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
			for (final BluetoothDevice device : pairedDevices) {
				this.mPairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
			}
		} else {
			this.mPairedDevicesArrayAdapter.add("No devices have been paired!");
		}
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();

		// Make sure we're not doing discovery anymore
		if (this.mBluetoothAdapter != null) {
			this.mBluetoothAdapter.cancelDiscovery();
		}

		// Unregister broadcast listeners
		this.unregisterReceiver(this.mReceiver);
	}

	// ===========================================================
	// Getter & Setter
	// ===========================================================

	// ===========================================================
	// Methods for/from SuperClass/Interfaces
	// ===========================================================

	// ===========================================================
	// Methods
	// ===========================================================
	
	private void discoverBluetoothDevices() {
		this.setProgressBarIndeterminateVisibility(true);
		this.setTitle("Scanning for devices...");

		this.findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);

		if (this.mBluetoothAdapter.isDiscovering()) {
			this.mBluetoothAdapter.cancelDiscovery();
		}

		this.mBluetoothAdapter.startDiscovery();
	}

	// ===========================================================
	// Inner and Anonymous Classes
	// ===========================================================
}