に接続しようとしていない私のプログラムの 2 つの異なるインスタンスがありますBluetoothServerSocket。
SCAN_MODE_CONNECTABLE_DISCOVERABLEインスタンスの 1 つは、スキャン モードを開始する前、および同じ生成された UUID を使用しBluetoothServerSocketてリッスン用に作成する前に、ランダムに生成された UUID を 1 つだけ持っています。BluetoothDeviceもう 1 つのインスタンスは、生成されたばかりの UUID に接続しようとする直前に、ランダムな UUIDを生成します。
各インスタンスが Bluetooth 接続を完了できません。プログラム全体を通して、接続できない理由を確認するために、多くのログを記録しました。
以下は、最初のインスタンスのコードです。(アプリの起動時に 1 つのランダムな UUID を生成します。) 誰かが私の Eclipse プロジェクトをダウンロードして見てみたい場合は、ここに MediaFire からのプロジェクトのリンクがあります。2 番目のインスタンスについては、以下のコードの C スタイルのコメントをアンコメントすると、それが明らかになります。
結果として、2 つのデバイス間の接続が成功することを期待していました。接続が成功すると、生成された UUID を使用してデバイスがリッスン ソケットに接続されます。観察された結果は、その可能性が低いことを示しています。
私の知る限り、UUID を取得する唯一の方法は、から取得することですUUID.randomUUID()。他の方法がある場合は、下にコメントを投稿してください。確認します。しかし、今のところ、それは私が望んでいた答えではありません。
前もって感謝します。
package o.p;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.UUID;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
/**
* The purpose of this app is to create a server-only Bluetooth connection that
* only accepts incoming Bluetooth connections. It is used only for testing
* one device that needs Bluetooth tweaking in order to consistently work
* correctly on the other device. In short, 2 devices are required.
* */
public class Main extends Activity implements View.OnClickListener {
//Button
private Button acceptButton;
private Button scanButton;
//Bluetooth stuffs.
private BluetoothAdapter btAdapter;
private BluetoothServerSocket serverSocket;
private BluetoothSocket socket;
private BluetoothDevice targetDevice;
private final UUID uuid = UUID.randomUUID();
/*private UUID randomUUID;*/
//Accepting thread.
private class Accept implements Runnable {
private BluetoothServerSocket socket;
private BluetoothSocket result = null;
public Accept(BluetoothServerSocket s) {
socket = s;
result = null;
}
@Override
public void run() {
try {
Log.d("DEBUG", "Accepting.");
result = socket.accept();
Log.d("DEBUG", "Closing server socket.");
socket.close();
}
catch (IOException e) {
Log.d("DEBUG - onClick(), case Accept", "Unable to accept incoming connection.");
}
}
public BluetoothSocket getSocket() {
while (result == null);
return result;
}
}
//Connecting thread.
private class Connecting implements Runnable {
private BluetoothDevice device;
public Connecting(BluetoothDevice d) {
device = d;
}
@Override
public void run() {
try {
/*Log.d("DEBUG", "Generating a new random UUID.");
randomUUID = UUID.randomUUID();*/
Log.d("DEBUG", "Obtaining a socket.");
BluetoothSocket s = device.createRfcommSocketToServiceRecord(uuid);
Log.d("DEBUG", "Cancelling discovery, if it's still discovering.");
if (btAdapter.isDiscovering())
btAdapter.cancelDiscovery();
Log.d("DEBUG", "Connecting to listening socket with UUID: " + uuid.toString());
s.connect();
}
catch (IOException e) {
Log.d("DEBUG - Connecting.run()", "Unable to connect to the listening socket.");
}
}
}
//Thread executor
private ThreadPoolExecutor executor = (ThreadPoolExecutor) Executors.newCachedThreadPool();
//BroadcastReceiver for accepting Bluetooth
private BroadcastReceiver receiver;
@Override
public void onCreate(Bundle b) {
super.onCreate(b);
setContentView(R.layout.main);
init();
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button_accept:
Log.d("DEBUG", "Pressing the Accept button.");
Accept acceptThread = new Accept(serverSocket);
Connecting connectThread = new Connecting(targetDevice);
if (serverSocket != null) {
executor.execute(acceptThread);
executor.execute(connectThread);
socket = acceptThread.getSocket();
}
else {
Log.d("DEBUG", "Server socket isn't ready.");
Toast.makeText(this, "Server socket isn't ready.", Toast.LENGTH_LONG).show();
}
break;
case R.id.button_scan:
if (btAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
Log.d("DEBUG", "Initiating discovery scan mode.");
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
this.startActivity(discoverableIntent);
Toast.makeText(this, "Being discovered...", Toast.LENGTH_LONG).show();
}
if (btAdapter.isDiscovering()) {
Toast.makeText(this, "Re-scanning...", Toast.LENGTH_SHORT).show();
Log.d("DEBUG", "Re-scanning.");
btAdapter.cancelDiscovery();
}
Log.d("DEBUG", "Scanning.");
Toast.makeText(this, "Scanning...", Toast.LENGTH_LONG).show();
btAdapter.startDiscovery();
break;
}
}
private void init() {
Log.d("DEBUG", "Initializing.");
Log.d("DEBUG", "Button initializing.");
acceptButton = (Button) findViewById(R.id.button_accept);
acceptButton.setOnClickListener(this);
scanButton = (Button) findViewById(R.id.button_scan);
scanButton.setOnClickListener(this);
Log.d("DEBUG", "Registering BroadcastReceiver.");
receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
Log.d("DEBUG", "Device has been found.");
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Log.d("DEBUG", "Obtained a device from Intent.");
if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
Log.d("DEBUG", "Removing paired device.");
try {
Method m = device.getClass().getMethod("removeBond", (Class[]) null);
m.invoke(device, (Object[]) null);
Log.d("DEBUG", "Removed " + device);
}
catch (NoSuchMethodException e) {
Log.e("ERROR - DeviceReceiver.onReceive()", "", e);
}
catch (IllegalArgumentException e) {
Log.e("ERROR - DeviceReceiver.onReceive()", "", e);
}
catch (IllegalAccessException e) {
Log.e("ERROR - DeviceReceiver.onReceive()", "", e);
}
catch (InvocationTargetException e) {
Log.e("ERROR - DeviceReceiver.onReceive()", "", e);
}
}
else {
Log.d("DEBUG", "Obtaining remote device's address.");
btAdapter.getRemoteDevice(device.getAddress());
try {
serverSocket = btAdapter.listenUsingRfcommWithServiceRecord(device.getName(), uuid);
Log.d("DEBUG", "Listening to " + device.getName() + "...");
}
catch (IOException e) {
Log.d("DEBUG - onReceive()", "Unable to create a server socket after receiving a broadcast.", e);
serverSocket = null;
Log.d("DEBUG", "Server socket is set to null.");
}
}
targetDevice = device;
}
else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
Log.d("DEBUG", "Scanning finished.");
}
}
};
Log.d("DEBUG", "Creating Bluetooth Adapter.");
btAdapter = BluetoothAdapter.getDefaultAdapter();
try {
Log.d("DEBUG", "Creating a server socket for listening using UUID: " + uuid.toString());
serverSocket = btAdapter.listenUsingRfcommWithServiceRecord("server", uuid);
}
catch (IOException e) {
Log.d("DEBUG - init()", "Error in creating a server socket from uuid.");
}
}
@Override
public void onResume() {
super.onResume();
//TODO: Not done with the receivers.
IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(receiver, filter);
filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(receiver, filter);
}
@Override
public void onPause() {
//TODO: Complete this one. Same for onResume().
super.onPause();
unregisterReceiver(receiver);
}
}