我需要从我的Android应用程序建立与obd2设备的连接，如扭矩app.I需要从Android手机配对。
答案 0 :(得分：3)
该服务用于查找配对的OBD-2，连接并保持获取实时数据，即标准PID，并根据标准PID查找其他实时参数，如总行驶距离，燃料消耗等。这是在Mobile和Head Unit（安装在Car中）中测试的。请参阅android-obd-reader示例应用程序：
https://github.com/md-sohrab-alam/android-obd-reader
Mozilla/5.0+Windows+NT+6.1;+WOW64;+Trident/7.0;+rv:11.0)+like+Geckopackage com.sohrab.obd.reader.service;
import android.app.IntentService;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Binder;
import android.os.Build;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.text.TextUtils;
import android.widget.Toast;
import com.sohrab.obd.reader.application.ObdPreferences;
import com.sohrab.obd.reader.constants.DefineObdReader;
import com.sohrab.obd.reader.enums.ObdProtocols;
import com.sohrab.obd.reader.obdCommand.ObdCommand;
import com.sohrab.obd.reader.obdCommand.ObdConfiguration;
import com.sohrab.obd.reader.obdCommand.control.TroubleCodesCommand;
import com.sohrab.obd.reader.obdCommand.protocol.EchoOffCommand;
import com.sohrab.obd.reader.obdCommand.protocol.LineFeedOffCommand;
import com.sohrab.obd.reader.obdCommand.protocol.ObdResetCommand;
import com.sohrab.obd.reader.obdCommand.protocol.SelectProtocolCommand;
import com.sohrab.obd.reader.obdCommand.protocol.SpacesOffCommand;
import com.sohrab.obd.reader.obdCommand.protocol.TimeoutCommand;
import com.sohrab.obd.reader.trip.TripRecord;
import com.sohrab.obd.reader.utils.L;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Set;
import app.com.android_obd_reader.R;
/**
* created by sohrab 01/12/2017
* <p>
* Service for managing connection and data communication with a OBD-2 in background and update data to RealTime screen.
* It connects paired OBD-2 Or wait until paired.
* Once it is paired, try to connect with Bluetooth Socket along with some specific OBD-2 command,
* if connected, fetch data until OBD-2 disconnected and if somehow,
* it disconnected then go to connect and this is in loop until user quit from App.
*/
public class ObdReaderService extends IntentService implements DefineObdReader {
private static final String TAG = "ObdReaderService";
// receive when OBD-2 connected
public final static char PID_STATUS_SUCCESS = '1';
public final static int DEVICE_NOT_PAIRED = 1;
public final static int OBD_NOT_RESPONDING = 2;
public final static int OBD_CONNECTED = 3;
public final static int INIT_OBD = 4;
// private static final int NOTIFICATION_ID = 101;
private static final int DELAY_FIFTEEN_SECOND = 15000;
private static final int DELAY_TWO_SECOND = 2000;
// this is used to find TroubleCode if true. This is used in InspectionActivity where fault is shown.
public boolean mIsFaultCodeRead = true;
private final IBinder mBinder = new LocalBinder();
// private int mLastNotificationType;
// name of OBD
private String OBD_SMALL = "obd";
private String OBD_CAPS = "OBD";
private String V_LINK = "V-LINK";
private BluetoothManager mBluetoothManager;//Bluetooth Manager
private BluetoothAdapter mBluetoothAdapter;//Bluetooth adapter
private BluetoothSocket mSocket;
//set OBD-2 connection status
private boolean isConnected;
// private NotificationCompat.Builder mNotificationBuilder;
// private NotificationManager mNotificationManager;
private boolean mIsRunningSuccess;
private Intent mIntent = new Intent(ACTION_READ_OBD_REAL_TIME_DATA);
private char[] mSupportedPids;
public ObdReaderService() {
super("ObdReaderService");
L.i("ObdReaderService");
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
@Override
protected void onHandleIntent(@Nullable Intent intent) {
L.i("onHandleIntent" + "Thread is :: " + Thread.currentThread().getId());
// setUpAsForeground();
if (initiateConnection()) {
if (!isEnable()) {
enableBlutooth();
}
findObdDevicesAndConnect();
}
L.i("onHandleIntent bottom");
// mNotificationManager.cancel(NOTIFICATION_ID);
ObdPreferences.get(getApplicationContext()).setServiceRunningStatus(false);
ObdPreferences.get(getApplicationContext()).setIsOBDconnected(false);
TripRecord.getTripRecode(this).clear();
}
/**
* This method is recursively called until service stopped.
*/
private void findObdDevicesAndConnect() {
if (!isConnected) {
findPairedDevices();
}
if (isConnected) {
executeCommand();
}
if (ObdPreferences.get(getApplicationContext()).getServiceRunningStatus()) {
L.i("findObdDevicesAndConnect()");
findObdDevicesAndConnect();
}
}
/**
* find paired OBD-2 devices in loop until found and connected or service stopped.
*/
private void findPairedDevices() {
while (!isConnected && ObdPreferences.get(getApplicationContext()).getServiceRunningStatus()) {
if (mBluetoothAdapter != null) {
boolean deviceFound = false;
Set<BluetoothDevice> bluetoothDevices = mBluetoothAdapter.getBondedDevices();
for (BluetoothDevice device : bluetoothDevices) {
if (device != null) {
String name = device.getName();
if (name != null && (name.contains(OBD_SMALL) || name.contains(OBD_CAPS) || name.toUpperCase().contains(V_LINK))) {
try {
connectOBDDevice(device);
} catch (Exception e) {
L.i("connectOBDDevice return Exception :: " + e != null ? e.getMessage() : "");
}
deviceFound = true;
break;
}
}
}
if (!deviceFound) {
/* if (mLastNotificationType != DEVICE_NOT_PAIRED) {
mLastNotificationType = DEVICE_NOT_PAIRED;
updateNotification(getString(R.string.waiting_for_obd));
}*/
sendBroadcast(ACTION_OBD_CONNECTION_STATUS, getString(R.string.waiting_for_obd));
}
}
}
}
/**
* connects specified bluetooth OBD device with Bluetooth Socket.
* if bluetooth socked connected then use some init OBD-2 command to initialize,
* if command response is success, then we assume connection is established and ready to fetch data.
*
* @param device
* @throws Exception
*/
public void connectOBDDevice(final BluetoothDevice device) throws Exception {
try {
mSocket = (BluetoothSocket) device.getClass().getMethod("createInsecureRfcommSocket", new Class[]{int.class}).invoke(device, 1);
} catch (Exception e) {
// e.printStackTrace();
L.i("createInsecureRfcommSocket failed");
closeSocket();
}
if (mSocket != null) {
try {
mBluetoothAdapter.cancelDiscovery();
Thread.sleep(500);
mSocket.connect();
L.i("Socket connected");
} catch (Exception e) {
L.i("Socket connection exception :: " + e.getMessage());
// e.printStackTrace();
closeSocket();
}
boolean isSockedConnected = mSocket.isConnected();
if (isSockedConnected) {
try {
Thread.sleep(DELAY_TWO_SECOND);
/* if (mLastNotificationType != INIT_OBD) {
mLastNotificationType = INIT_OBD;
updateNotification(getString(R.string.connecting_to_ecu));
}*/
L.i("Executing reset command in new Thread :: " + Thread.currentThread().getId());
final Thread newThread = new Thread(new Runnable() {
@Override
public void run() {
try {
// this thread is required because in Headunit command.run method block infinitly ,
// therefore this thread life is maximum 15 second so that block can be handled.
mIsRunningSuccess = false;
new ObdResetCommand().run(mSocket.getInputStream(), mSocket.getOutputStream());
Thread.sleep(1000);
new EchoOffCommand().run(mSocket.getInputStream(), mSocket.getOutputStream());
Thread.sleep(200);
new LineFeedOffCommand().run(mSocket.getInputStream(), mSocket.getOutputStream());
Thread.sleep(200);
new SpacesOffCommand().run(mSocket.getInputStream(), mSocket.getOutputStream());
Thread.sleep(200);
new SpacesOffCommand().run(mSocket.getInputStream(), mSocket.getOutputStream());
Thread.sleep(200);
new TimeoutCommand(125).run(mSocket.getInputStream(), mSocket.getOutputStream());
// updateNotification(getString(R.string.searching_protocol));
Thread.sleep(200);
new SelectProtocolCommand(ObdProtocols.AUTO).run(mSocket.getInputStream(), mSocket.getOutputStream());
Thread.sleep(200);
new EchoOffCommand().run(mSocket.getInputStream(), mSocket.getOutputStream());
// updateNotification(getString(R.string.searching_supported_sensor));
Thread.sleep(200);
mIsRunningSuccess = true;
// checkPid0To20(true);
} catch (Exception e) {
mIsRunningSuccess = false;
L.i("In new thread reset command exception :: " + e != null ? e.getMessage() : "");
}
}
});
newThread.start();
newThread.join(DELAY_FIFTEEN_SECOND);
L.i("Thread wake to check reset command status i.e :: " + Thread.currentThread().getId() + ", mIsRunningSuccess :: " + mIsRunningSuccess);
isSockedConnected = mIsRunningSuccess;
} catch (Exception e) {
L.i(" reset command Exception :: " + e.getMessage());
isSockedConnected = false;
}
}
if (mSocket != null && mSocket.isConnected() && isSockedConnected) {
setConnection(false);
/* if (mLastNotificationType != OBD_CONNECTED) {
mLastNotificationType = OBD_CONNECTED;
updateNotification(getString(R.string.connected_ok));
}
*/
} else {
if (mSupportedPids != null && mSupportedPids.length == 32) {
if ((mSupportedPids[12] != PID_STATUS_SUCCESS) || (mSupportedPids[11] != PID_STATUS_SUCCESS)) {
// speed pid not supportedsupported
// updateNotification(getString(R.string.unable_to_connect));
sendBroadcast(ACTION_OBD_CONNECTION_STATUS, getString(R.string.unable_to_connect));
return;
}
}
sendBroadcast(ACTION_OBD_CONNECTION_STATUS, getString(R.string.obd2_adapter_not_responding));
/*
if (mLastNotificationType != OBD_NOT_RESPONDING) {
mLastNotificationType = OBD_NOT_RESPONDING;
updateNotification(getString(R.string.obd2_adapter_not_responding));
}
*/
}
}
}
/**
* Once OBD-2 connected, this method will execute to fetch data continuously until OBD disconnected or Service stopped.
*/
private void executeCommand() {
L.i("executing commands thread is :: " + Thread.currentThread().getId());
TripRecord tripRecord = TripRecord.getTripRecode(this);
ArrayList<ObdCommand> commands = (ArrayList<ObdCommand>) ObdConfiguration.getmObdCommands().clone();
int count = 0;
while (mSocket != null && mSocket.isConnected() && commands.size() > count && isConnected && ObdPreferences.get(getApplicationContext()).getServiceRunningStatus()) {
ObdCommand command = commands.get(count);
try {
L.i("command run :: " + command.getName());
command.run(mSocket.getInputStream(), mSocket.getOutputStream());
L.i("result is :: " + command.getFormattedResult() + " :: name is :: " + command.getName());
tripRecord.updateTrip(command.getName(), command);
if (mIsFaultCodeRead) {
try {
TroubleCodesCommand troubleCodesCommand = new TroubleCodesCommand();
troubleCodesCommand.run(mSocket.getInputStream(), mSocket.getOutputStream());
tripRecord.updateTrip(troubleCodesCommand.getName(), troubleCodesCommand);
mIsFaultCodeRead = false;
} catch (Exception e) {
e.printStackTrace();
}
}
if (mIntent == null)
mIntent = new Intent(ACTION_READ_OBD_REAL_TIME_DATA);
sendBroadcast(mIntent);
} catch (Exception e) {
L.i("execute command Exception :: " + e.getMessage());
if (!TextUtils.isEmpty(e.getMessage()) && (e.getMessage().equals("Broken pipe") || e.getMessage().equals("Connection reset by peer"))) {
L.i("command Exception :: " + e.getMessage());
setDisconnection();
/*
if (mLastNotificationType != OBD_NOT_RESPONDING) {
mLastNotificationType = OBD_NOT_RESPONDING;
updateNotification(getString(R.string.obd2_adapter_not_responding));
}
*/
}
}
count++;
if (count == commands.size()) {
count = 0;
}
}
// exit loop means connection lost, so set connection status false
isConnected = false;
}
/**
* send broadcast with specific action and data
*
* @param action
* @param data
*/
private void sendBroadcast(final String action, String data) {
final Intent intent = new Intent(action);
intent.putExtra(ObdReaderService.INTENT_OBD_EXTRA_DATA, data);
sendBroadcast(intent);
}
/**
* send broadcast with specific action
*
* @param action
*/
private void broadcastUpdate(final String action) {
final Intent intent = new Intent(action);
sendBroadcast(intent);
}
@Override
public void onCreate() {
super.onCreate();
//fetchLocation();
ObdPreferences.get(getApplicationContext()).setServiceRunningStatus(true);
ObdPreferences.get(getApplicationContext()).setIsOBDconnected(false);
// mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
L.i("Service Created :: ");
}
/**
* check whether this devices support bluetooth
*
* @return
*/
protected boolean initiateConnection() {
boolean isBlueToothSupported = getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH);
boolean isInitialized = initialize();
if (!isBlueToothSupported || !isInitialized) {
Toast.makeText(this, getString(R.string.bluetooth_unsupported), Toast.LENGTH_SHORT).show();
return false;
}
return true;
}
/**
* check BluetoothServices available in this device or not
*
* @return
*/
public boolean initialize() {
if (mBluetoothManager == null) {
mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
if (mBluetoothManager == null) {
return false;
}
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
mBluetoothAdapter = mBluetoothManager.getAdapter();
} else {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
}
if (mBluetoothAdapter == null) {
return false;
}
return true;
}
@Override
public void onDestroy() {
super.onDestroy();
L.i("service onDestroy");
//mNotificationManager.cancel(NOTIFICATION_ID);
closeSocket();
ObdPreferences.get(getApplicationContext()).setServiceRunningStatus(false);
ObdPreferences.get(getApplicationContext()).setIsOBDconnected(false);
TripRecord.getTripRecode(this).clear();
}
/**
* close Bluetooth Socket
*/
private void closeSocket() {
L.i("socket closed :: ");
if (mSocket != null) {
try {
mSocket.close();
} catch (IOException e) {
L.i("socket closing failed :: ");
}
}
}
/**
* check whether Bluetooth is enable or not
*
* @return
*/
public boolean isEnable() {
if (mBluetoothAdapter == null)
return false;
return mBluetoothAdapter.isEnabled();
}
/**
* enable bluetooth without user interaction
*
* @return
*/
public boolean enableBlutooth() {
if (mBluetoothAdapter != null)
return mBluetoothAdapter.enable();
return false;
}
@Override
public boolean stopService(Intent name) {
ObdPreferences.get(getApplicationContext()).setServiceRunningStatus(false);
return super.stopService(name);
}
/*Method used to set device disconnected state through the application...*/
public void setDisconnection() {
/*
if (mLastNotificationType != OBD_NOT_RESPONDING) {
mLastNotificationType = OBD_NOT_RESPONDING;
updateNotification(getString(R.string.obd2_adapter_not_responding));
}
*/
ObdPreferences.get(getApplicationContext()).setIsOBDconnected(false);
isConnected = false;
closeSocket();
L.i("socket disconnected :: ");
// broadcastUpdate(ACTION_OBD_DISCONNECTED);
sendBroadcast(ACTION_OBD_CONNECTION_STATUS, getString(R.string.connect_lost));
}
/*Method used to set device connected state through the application...*/
private void setConnection(boolean isFromBle) {
ObdPreferences.get(getApplicationContext()).setIsOBDconnected(true);
isConnected = true;
// sendBroadcast(ACTION_OBD_CONNECTED, String.valueOf(isFromBle));
sendBroadcast(ACTION_OBD_CONNECTION_STATUS, getString(R.string.obd_connected));
}
/**
* create Binder instance used to return in onBind method
*/
public class LocalBinder extends Binder {
public ObdReaderService getService() {
return ObdReaderService.this;
}
}
答案 1 :(得分：1)
此代码将帮助您配对任何蓝牙设备，试一试
<强> BluetoothDemo.java
package com.bluetooth;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Set;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothClass;
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.os.Handler;
import android.os.Message;
import android.os.ParcelUuid;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class BluetoothDemo extends Activity {
/** Called when the activity is first created. */
ListView listViewPaired;
ListView listViewDetected;
ArrayList<String> arrayListpaired;
Button buttonSearch,buttonOn,buttonDesc,buttonOff;
ArrayAdapter<String> adapter,detectedAdapter;
static HandleSeacrh handleSeacrh;
BluetoothDevice bdDevice;
BluetoothClass bdClass;
ArrayList<BluetoothDevice> arrayListPairedBluetoothDevices;
private ButtonClicked clicked;
ListItemClickedonPaired listItemClickedonPaired;
BluetoothAdapter bluetoothAdapter = null;
ArrayList<BluetoothDevice> arrayListBluetoothDevices = null;
ListItemClicked listItemClicked;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listViewDetected = (ListView) findViewById(R.id.listViewDetected);
listViewPaired = (ListView) findViewById(R.id.listViewPaired);
buttonSearch = (Button) findViewById(R.id.buttonSearch);
buttonOn = (Button) findViewById(R.id.buttonOn);
buttonDesc = (Button) findViewById(R.id.buttonDesc);
buttonOff = (Button) findViewById(R.id.buttonOff);
arrayListpaired = new ArrayList<String>();
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
clicked = new ButtonClicked();
handleSeacrh = new HandleSeacrh();
arrayListPairedBluetoothDevices = new ArrayList<BluetoothDevice>();
/*
* the above declaration is just for getting the paired bluetooth devices;
* this helps in the removing the bond between paired devices.
*/
listItemClickedonPaired = new ListItemClickedonPaired();
arrayListBluetoothDevices = new ArrayList<BluetoothDevice>();
adapter= new ArrayAdapter<String>(BluetoothDemo.this, android.R.layout.simple_list_item_1, arrayListpaired);
detectedAdapter = new ArrayAdapter<String>(BluetoothDemo.this, android.R.layout.simple_list_item_single_choice);
listViewDetected.setAdapter(detectedAdapter);
listItemClicked = new ListItemClicked();
detectedAdapter.notifyDataSetChanged();
listViewPaired.setAdapter(adapter);
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
getPairedDevices();
buttonOn.setOnClickListener(clicked);
buttonSearch.setOnClickListener(clicked);
buttonDesc.setOnClickListener(clicked);
buttonOff.setOnClickListener(clicked);
listViewDetected.setOnItemClickListener(listItemClicked);
listViewPaired.setOnItemClickListener(listItemClickedonPaired);
}
private void getPairedDevices() {
Set<BluetoothDevice> pairedDevice = bluetoothAdapter.getBondedDevices();
if(pairedDevice.size()>0)
{
for(BluetoothDevice device : pairedDevice)
{
arrayListpaired.add(device.getName()+"\n"+device.getAddress());
arrayListPairedBluetoothDevices.add(device);
}
}
adapter.notifyDataSetChanged();
}
class ListItemClicked implements OnItemClickListener
{
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
bdDevice = arrayListBluetoothDevices.get(position);
//bdClass = arrayListBluetoothDevices.get(position);
Log.i("Log", "The dvice : "+bdDevice.toString());
/*
* here below we can do pairing without calling the callthread(), we can directly call the
* connect(). but for the safer side we must usethe threading object.
*/
//callThread();
//connect(bdDevice);
Boolean isBonded = false;
try {
isBonded = createBond(bdDevice);
if(isBonded)
{
//arrayListpaired.add(bdDevice.getName()+"\n"+bdDevice.getAddress());
//adapter.notifyDataSetChanged();
getPairedDevices();
adapter.notifyDataSetChanged();
}
} catch (Exception e) {
e.printStackTrace();
}//connect(bdDevice);
Log.i("Log", "The bond is created: "+isBonded);
}
}
class ListItemClickedonPaired implements OnItemClickListener
{
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
bdDevice = arrayListPairedBluetoothDevices.get(position);
try {
Boolean removeBonding = removeBond(bdDevice);
if(removeBonding)
{
arrayListpaired.remove(position);
adapter.notifyDataSetChanged();
}
Log.i("Log", "Removed"+removeBonding);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/*private void callThread() {
new Thread(){
public void run() {
Boolean isBonded = false;
try {
isBonded = createBond(bdDevice);
if(isBonded)
{
arrayListpaired.add(bdDevice.getName()+"\n"+bdDevice.getAddress());
adapter.notifyDataSetChanged();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}//connect(bdDevice);
Log.i("Log", "The bond is created: "+isBonded);
}
}.start();
}*/
private Boolean connect(BluetoothDevice bdDevice) {
Boolean bool = false;
try {
Log.i("Log", "service method is called ");
Class cl = Class.forName("android.bluetooth.BluetoothDevice");
Class[] par = {};
Method method = cl.getMethod("createBond", par);
Object[] args = {};
bool = (Boolean) method.invoke(bdDevice);//, args);// this invoke creates the detected devices paired.
//Log.i("Log", "This is: "+bool.booleanValue());
//Log.i("Log", "devicesss: "+bdDevice.getName());
} catch (Exception e) {
Log.i("Log", "Inside catch of serviceFromDevice Method");
e.printStackTrace();
}
return bool.booleanValue();
};
public boolean removeBond(BluetoothDevice btDevice)
throws Exception
{
Class btClass = Class.forName("android.bluetooth.BluetoothDevice");
Method removeBondMethod = btClass.getMethod("removeBond");
Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);
return returnValue.booleanValue();
}
public boolean createBond(BluetoothDevice btDevice)
throws Exception
{
Class class1 = Class.forName("android.bluetooth.BluetoothDevice");
Method createBondMethod = class1.getMethod("createBond");
Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
return returnValue.booleanValue();
}
class ButtonClicked implements OnClickListener
{
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.buttonOn:
onBluetooth();
break;
case R.id.buttonSearch:
arrayListBluetoothDevices.clear();
startSearching();
break;
case R.id.buttonDesc:
makeDiscoverable();
break;
case R.id.buttonOff:
offBluetooth();
break;
default:
break;
}
}
}
private BroadcastReceiver myReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Message msg = Message.obtain();
String action = intent.getAction();
if(BluetoothDevice.ACTION_FOUND.equals(action)){
Toast.makeText(context, "ACTION_FOUND", Toast.LENGTH_SHORT).show();
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
try
{
//device.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(device, true);
//device.getClass().getMethod("cancelPairingUserInput", boolean.class).invoke(device);
}
catch (Exception e) {
Log.i("Log", "Inside the exception: ");
e.printStackTrace();
}
if(arrayListBluetoothDevices.size()<1) // this checks if the size of bluetooth device is 0,then add the
{ // device to the arraylist.
detectedAdapter.add(device.getName()+"\n"+device.getAddress());
arrayListBluetoothDevices.add(device);
detectedAdapter.notifyDataSetChanged();
}
else
{
boolean flag = true; // flag to indicate that particular device is already in the arlist or not
for(int i = 0; i<arrayListBluetoothDevices.size();i++)
{
if(device.getAddress().equals(arrayListBluetoothDevices.get(i).getAddress()))
{
flag = false;
}
}
if(flag == true)
{
detectedAdapter.add(device.getName()+"\n"+device.getAddress());
arrayListBluetoothDevices.add(device);
detectedAdapter.notifyDataSetChanged();
}
}
}
}
};
private void startSearching() {
Log.i("Log", "in the start searching method");
IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
BluetoothDemo.this.registerReceiver(myReceiver, intentFilter);
bluetoothAdapter.startDiscovery();
}
private void onBluetooth() {
if(!bluetoothAdapter.isEnabled())
{
bluetoothAdapter.enable();
Log.i("Log", "Bluetooth is Enabled");
}
}
private void offBluetooth() {
if(bluetoothAdapter.isEnabled())
{
bluetoothAdapter.disable();
}
}
private void makeDiscoverable() {
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
Log.i("Log", "Discoverable ");
}
class HandleSeacrh extends Handler
{
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 111:
break;
default:
break;
}
}
}
}
这是 main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/buttonOn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="On"/>
<Button
android:id="@+id/buttonDesc"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Make Discoverable"/>
<Button
android:id="@+id/buttonSearch"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Search"/>
<Button
android:id="@+id/buttonOff"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Bluetooth Off"/>
<ListView
android:id="@+id/listViewPaired"
android:layout_width="match_parent"
android:layout_height="120dp">
</ListView>
<ListView
android:id="@+id/listViewDetected"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</LinearLayout>
将此权限添加到您的清单文件中。
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH" />
希望这能清除你所有的疑虑。它在同样的情况下帮助了我......由Narendra pal here on my question
回答答案 2 :(得分：0)
使用以下github演示来建立连接并从设备读取数据。 https://github.com/pires/obd-java-api