蓝牙连接所需的变量

Question

目前，我正在尝试弄清楚如何在整个活动期间通过蓝牙与设备保持连接。我初始化了一些变量以使连接继续进行。

我之前的活动流程是主页 > 用户输入文本页面 > 蓝牙连接（发送信息）。

这样，每次我回到用户输入文本页面时，蓝牙连接都会被重置，因为当我进入下一页时，它会重新运行所有接收器和东西。

现在我正在向前移动蓝牙连接。现在的意思是主页 > 蓝牙连接 > 用户输入文本页面（发送）。

但是在我的蓝牙连接页面上连接后，我不确定我应该在SharedPreferences 中引入/保存哪些变量，以便蓝牙连接保持不变并且我可以立即发送。

//This method runs when I click a device on my ListView.
    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();

                }
            };
        };

//This is the clientThread if click == 1, it'll start this.
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--;

            }
        }
    };

public 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;
                }
            }
        }
    }

//On Click it'll send the message stored in the editText.
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();
                    }
                }

            }
        });

所以最重要的是。我的用户输入文本页面应该有什么方法？我必须在我的用户输入文本页面中拥有所有这些方法，还是可以通过SharedPreferences 引入变量？

谢谢。

Answer 1

在主线程上处理蓝牙连接可能是不好的做法。您应该真正通过服务/后台线程处理蓝牙连接/维护。然后，您的活动可以通过 BroadcastReceiver 和句柄与服务对话。