使藍牙通過Activites保持連接
[英]Making the Bluetooth stay connected through Activites
問題描述
我正在研究需要藍牙作為Android設備和微控制器芯片之間通信方式的項目。
我已經成功完成了可以與設備配對並建立連接並將數據發送到芯片的部分，並且工作正常。
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 。
這里的主要問題是，如果要輸入文本/字符串>連接到設備，但是在連接之后，我決定要在上一頁中進行更改。 因此，我單擊返回，藍牙連接已停止。 它不會保持連接狀態。
因此，我的主要思想是提出“藍牙連接頁面”，使我可以先連接到設備，然后再輸入文本/字符串。 這樣，如果我決定進行其他活動或選項卡，則只需在選項卡上滑動並輸入所需內容，每個選項卡中都會有一個“發送”按鈕，使我可以直接發送數據而無需再次連接。 我目前對此感到困惑。
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();
}
}
我不確定，什么變量或應如何將所需的變量分配到SharedPreferences中，以使我在使用應用程序時始終保持連接狀態。 簡而言之，當我連接一次后，一直保持連接狀態。 我希望有人可以幫助我。
提前致謝。
1 個解決方案
解決方案1
0 2014-07-27 10:41:10
SDK中有一個藍牙示例。 如果您遵循它，您將看到他們在服務中執行藍牙操作，並且活動連接到該服務。 服務始終保持活動狀態，而不管程序始終在運行。
如何在多個活動中使用連接線程
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