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我正在研究需要藍牙作爲Android設備和微控制器芯片之間通信形式的項目。通過活動使藍牙保持連接狀態
我已經成功完成了可以與設備配對並獲得連接並將數據發送到芯片並且工作正常的部分。
我的程序的流程是： 起始頁>輸入文本/字符串>連接到設備>發送數據。
這裏的主要問題是，如果我要輸入文本/字符串>連接到設備，但連接後，我決定要更改上一頁中的內容。所以我點擊返回並停止藍牙連接。它不保持連接。
所以我的主要想法是提出藍牙連接頁面，允許我先連接到設備，然後繼續輸入我的文本/字符串。這樣，如果我決定製作另一個活動或選項卡，我只需滑過選項卡並輸入任何我想要的內容，每個選項卡中都會有一個發送按鈕，允許我直接發送數據而無需重新連接。我目前堅持這一點。
藍牙活動：
public class bluetoothtest extends Activity {
/** Called when the activity is first created. */
SharedPreferences sPrefs;
//Variables
final byte ANIMATION_MODE=1;
final byte PICTURE_MODE=2;
final byte TEXT_MODE=3;
int a,b,c,d;
int count = 0, click = 0;
//TextView
TextView btStatus;
//ListView
ListView listViewPaired;
ListView deviceList;
ListView chatList;
//EditText
EditText contentRow1, contentRow2, contentRow3, contentRow4;
//Buttons
Button buttonSearch, buttonConnect;
ToggleButton bluetoothStatus;
//Bluetooth Related
BluetoothSocket socket;
BluetoothDevice bdDevice;
BluetoothClass bdClass;
deviceListAdapter mAdapter;
ChatListAdapter chAdapter;
Context mContext;
private BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
private readThread readThread = null;
private String BlueToothAddress;
//Array List/Adapter
ArrayList<BluetoothDevice> arrayListBluetoothDevices = null;
ArrayList<BluetoothDevice> arrayListPairedBluetoothDevices;
ArrayList<String> arrayListpaired;
ArrayAdapter<String> adapter;
private ArrayList<deviceListItem> list;
private ArrayList<SiriListItem> delist;
//Misc
static HandleSeacrh handleSeacrh;
private ButtonClicked clicked;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//TextView
btStatus = (TextView) findViewById(R.id.btStatus);
//ListView
deviceList = (ListView) findViewById(R.id.deviceList);
chatList = (ListView) findViewById(R.id.chatList);
//EditText
contentRow1 = (EditText) findViewById(R.id.contentRow1);
contentRow2 = (EditText) findViewById(R.id.contentRow2);
contentRow3 = (EditText) findViewById(R.id.contentRow3);
contentRow4 = (EditText) findViewById(R.id.contentRow4);
//Buttons
buttonSearch = (Button) findViewById(R.id.buttonSearch);
buttonConnect = (Button) findViewById(R.id.connectBtn);
bluetoothStatus = (ToggleButton) findViewById(R.id.btStatusBtn);
//Array List/Adapter
list = new ArrayList<deviceListAdapter.deviceListItem>();
delist = new ArrayList<ChatListAdapter.SiriListItem>();
chAdapter = new ChatListAdapter(this, delist);
mAdapter = new deviceListAdapter(this, list);
deviceList.setAdapter(chAdapter);
chatList.setAdapter(mAdapter);
//Misc
clicked = new ButtonClicked();
handleSeacrh = new HandleSeacrh();
deviceList.setOnItemClickListener(mDeviceClickListener);
bluetoothStatus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
bluetoothOnOff();
}
});
//Button Connect OnClickListener
buttonConnect.setOnClickListener(new View.OnClickListener() {
@SuppressLint("NewApi")
@Override
public void onClick(View arg0) {
if (count == 0) {
Toast.makeText(bluetoothtest.this,
"Please connect to a device first.",
Toast.LENGTH_LONG).show();
}
// Need API=14
else if (!socket.isConnected()) {
Toast.makeText(bluetoothtest.this,
"Connecting! Please wait.",
Toast.LENGTH_LONG).show();
}
else {
try {
sendMessageHandle(contentRow1.getText().toString(), contentRow2.getText().toString(), contentRow3.getText().toString(), contentRow4.getText().toString());
//sendMessageHandle(contentRow2.getText().toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
sPrefs = getSharedPreferences("storeData", MODE_PRIVATE);
if(((byte) sPrefs.getInt("Mode", 1) == TEXT_MODE)){
contentRow1.setText(sPrefs.getString("firstRow", " "));
contentRow2.setText(sPrefs.getString("secondRow", " "));
contentRow3.setText(sPrefs.getString("thirdRow", " "));
contentRow4.setText(sPrefs.getString("fourthRow", " "));
}
IntentFilter discoveryFilter = new IntentFilter(
BluetoothDevice.ACTION_FOUND);
this.registerReceiver(myReceiver, discoveryFilter);
IntentFilter foundFilter = new IntentFilter(
BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(myReceiver, foundFilter);
IntentFilter btState = new IntentFilter(
BluetoothAdapter.ACTION_STATE_CHANGED);
this.registerReceiver(myReceiver, btState);
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
buttonSearch.setOnClickListener(clicked);
if(bluetoothAdapter.isEnabled())
{
bluetoothStatus.setChecked(true);
//bluetoothStatus.setBackgroundColor(Color.GREEN);
btStatus.setText("Bluetooth Status: Enabled");
btStatus.setBackgroundColor(Color.GREEN);
}else if(!bluetoothAdapter.isEnabled())
{
bluetoothStatus.setChecked(false);
//bluetoothStatus.setBackgroundColor(Color.RED);
btStatus.setText("Bluetooth Status: Disabled");
btStatus.setBackgroundColor(Color.RED);
}
}
class ButtonClicked implements OnClickListener
{
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.buttonSearch:
//arrayListBluetoothDevices.clear();
startSearching();
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(BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)){
// bluetoothOnOff();
// }
if(BluetoothDevice.ACTION_FOUND.equals(action)){
Toast.makeText(context, "ACTION_FOUND", Toast.LENGTH_SHORT).show();
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device.getBondState() != BluetoothDevice.BOND_BONDED)
{ delist.add(new SiriListItem(device.getName() + "\n" + device.getAddress(), action, action, action, false));
mAdapter.notifyDataSetChanged();
deviceList.setSelection(delist.size() - 1);
}
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
setProgressBarIndeterminateVisibility(false);
if (deviceList.getCount() == 0) {
delist.add(new SiriListItem("Did not find any bluetooth device", action, action, action, false));
mAdapter.notifyDataSetChanged();
deviceList.setSelection(list.size() - 1);
}
buttonSearch.setText("Search again");
}
}
};
private void bluetoothOnOff(){
if(!bluetoothAdapter.isEnabled())
{
bluetoothAdapter.enable();
String text = "Bluetooth Status: Enabled";
bluetoothStatus.setChecked(false);
//bluetoothStatus.setBackgroundColor(Color.GREEN);
btStatus.setText(text);
btStatus.setBackgroundColor(Color.GREEN);
}else if(bluetoothAdapter.isEnabled()){
String text = "Bluetooth Status: Disabled";
bluetoothAdapter.disable();
bluetoothStatus.setChecked(true);
//bluetoothStatus.setBackgroundColor(Color.RED);
btStatus.setText(text);
btStatus.setBackgroundColor(Color.RED);
}
}
class HandleSeacrh extends Handler
{
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 111:
break;
default:
break;
}
}
}
//SharedPreferences sp;
private void sendMessageHandle(String msg, String msg2, String msg3, String msg4) throws InterruptedException {
final byte ANIMATION_MODE=1;
final byte PICTURE_MODE=2;
final byte TEXT_MODE=3;
final int k = 5;
int temp,row;
sPrefs = getSharedPreferences("storeData",MODE_PRIVATE);
byte mode = (byte) sPrefs.getInt("Mode",1);
byte [] pictureData = new byte [129];
if (socket == null) {
Toast.makeText(mContext, "No connection", Toast.LENGTH_SHORT)
.show();
return;
}
try {
OutputStream outputStream = socket.getOutputStream();
if(mode==TEXT_MODE){
//TextMode Signal
outputStream.write(4);
Thread.sleep(500);
//Row 1 Message/Scroll
outputStream.write(0);
if(sPrefs.getBoolean("scrollRow1", false))
{}else
{outputStream.write(6);}
msg.getBytes();
if(msg.getBytes().length > 0)
{a = 1;
outputStream.write(msg.getBytes());
outputStream.write(32);}
//Row 2 Message/Scroll
outputStream.write(1);
if(sPrefs.getBoolean("scrollRow2", false))
{}else
{outputStream.write(6);}
msg2.getBytes();
if(msg2.getBytes().length > 0)
{b = 1;
outputStream.write(msg2.getBytes());
outputStream.write(32);}
//Row 3 Message/Scroll
outputStream.write(2);
if(sPrefs.getBoolean("scrollRow3", false))
{}else
{outputStream.write(6);}
msg3.getBytes();
if(msg3.getBytes().length > 0)
{c = 1;
outputStream.write(msg3.getBytes());
outputStream.write(32);}
//Row 4 Message/Scroll
outputStream.write(3);
if(sPrefs.getBoolean("scrollRow4", false))
{}else
{outputStream.write(6);}
msg4.getBytes();
if(msg4.getBytes().length > 0)
{d = 1;
outputStream.write(msg4.getBytes());
outputStream.write(32);}
//End of Signal Transmission
outputStream.write(k);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(a == 1)
{ a = 0;
list.add(new deviceListItem(msg, false));
}
if(b == 1)
{ b = 0;
list.add(new deviceListItem(msg2, false));
}
if(c == 1)
{ c = 0;
list.add(new deviceListItem(msg3, false));
}
if(d == 1)
{ d = 0;
list.add(new deviceListItem(msg4, false));
}
mAdapter.notifyDataSetChanged();
chatList.setSelection(list.size() - 1);
}
public void cancle() {
try {
socket.close();
} catch (IOException e) {
}
}
private class clientThread extends Thread {
public void run() {
try {
//
bdDevice = bluetoothAdapter.getRemoteDevice(BlueToothAddress);
socket = bdDevice.createRfcommSocketToServiceRecord(UUID
.fromString("00001101-0000-1000-8000-00805F9B34FB"));
Message msg2 = new Message();
msg2.obj = "Please wait, connecting to server: "
+ BlueToothAddress;
msg2.what = 0;
LinkDetectedHandler.sendMessage(msg2);
socket.connect();
Log.i("tag", "This is the pairing section");
Message msg = new Message();
msg.obj = "Device connected. Sending message is allowed.";
msg.what = 0;
LinkDetectedHandler.sendMessage(msg);
readThread = new readThread();
readThread.start();
click++;
} catch (IOException e) {
Message msg = new Message();
msg.obj = "Error! Can't connect to device. Please try again.";
msg.what = 0;
LinkDetectedHandler.sendMessage(msg);
click--;
}
}
};
private Handler LinkDetectedHandler = new Handler() {
public void handleMessage(Message msg) {
Toast.makeText(getApplicationContext(), (String) msg.obj,
Toast.LENGTH_SHORT).show();
if (msg.what == 1) {
list.add(new deviceListItem((String) msg.obj,true));
} else {
list.add(new deviceListItem((String) msg.obj, false));
}
mAdapter.notifyDataSetChanged();
chatList.setSelection(list.size() - 4);
}
};
private class readThread extends Thread {
public void run() {
byte[] buffer = new byte[1024];
int bytes;
InputStream mmInStream = null;
String tmp = null;
try {
mmInStream = socket.getInputStream();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
while (true) {
try {
// read the data from the inputStream
if ((bytes = mmInStream.read(buffer)) > 0)
{
for (int i = 0; i < bytes; i++) {
tmp = "" + buffer[i];
String st = new String(tmp);
tmp = null;
Message msg = new Message();
msg.obj = st;
msg.what = 1;
}
}
} catch (IOException e) {
try {
mmInStream.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
break;
}
}
}
}
private OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// Cancel discovery because it's costly and we're about to connect
bluetoothAdapter.cancelDiscovery();
System.out.println("Bluetooth Adapter2 = "+bluetoothAdapter.cancelDiscovery());
SiriListItem item = delist.get(arg2);
mAdapter.notifyDataSetChanged();
// When device being clicked
count++;
click = 1;
// Get the device MAC address, which is the last 17 chars in the
// View
String info = item.message;
String address = info.substring(info.length() - 17);
BlueToothAddress = address;
if (click == 1) {
clientThread ct = new clientThread();
ct.start();
}
};
};
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
unregisterReceiver(myReceiver);
super.onDestroy();
}
}
我不知道，什麼變量或我應該如何分配需要到SharedPreferences變量，讓我保持聯繫一切的時候，我在應用程序。總之，一直保持聯繫，當我連接一次。我希望有人能幫助我解決這個問題。
在此先感謝。
我在哪裏可以找到SDK中的Bluetooth Sample？我現在在SDK Manager上，但我沒有看到任何藍牙相關的東西，雖然 – misleading93
https://android.googlesource.com/platform/development/+/eclair-passion-release/samples/BluetoothChat –