import android.bluetooth.BluetoothClass.Device; //导入依赖的package包/类
public boolean canBluetooth() {
	// Detect if any bluetooth a device is available for call
	if (bluetoothAdapter == null) {
	    // Device does not support Bluetooth
		return false;
	}
	boolean hasConnectedDevice = false;
	//If bluetooth is on
	if(bluetoothAdapter.isEnabled()) {
		
		//We get all bounded bluetooth devices
		// bounded is not enough, should search for connected devices....
		Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
		for(BluetoothDevice device : pairedDevices) {
			BluetoothClass bluetoothClass = device.getBluetoothClass();
               if (bluetoothClass != null) {
               	int deviceClass = bluetoothClass.getDeviceClass();
               	if(bluetoothClass.hasService(Service.RENDER) ||
               		deviceClass == Device.AUDIO_VIDEO_WEARABLE_HEADSET ||
               		deviceClass == Device.AUDIO_VIDEO_CAR_AUDIO ||
               		deviceClass == Device.AUDIO_VIDEO_HANDSFREE ) {
                    	//And if any can be used as a audio handset
                    	hasConnectedDevice = true;
                    	break;
               	}
			}
		}
	}
	boolean retVal = hasConnectedDevice && audioManager.isBluetoothScoAvailableOffCall();
	Log.d(THIS_FILE, "Can I do BT ? "+retVal);
	return retVal;
}
 

import android.bluetooth.BluetoothClass.Device; //导入依赖的package包/类
public static boolean isAvailable() {
	if (!ba.isEnabled())
		return false;
	Set<BluetoothDevice> devs = ba.getBondedDevices();
	for (final BluetoothDevice dev : devs) {
		BluetoothClass cl = dev.getBluetoothClass();
		if (cl != null && (cl.hasService(Service.RENDER) ||
				cl.getDeviceClass() == Device.AUDIO_VIDEO_HANDSFREE ||
				cl.getDeviceClass() == Device.AUDIO_VIDEO_CAR_AUDIO ||
				cl.getDeviceClass() == Device.AUDIO_VIDEO_WEARABLE_HEADSET))
			return true;
	}
	return false;
}
 

import android.bluetooth.BluetoothClass.Device; //导入依赖的package包/类
public abstract void onDeviceDiscovered(Device device);