我尝试连接到我的Android应用程序上的其他设备时遇到问题
设备显示在列表中但我无法从我的应用程序建立连接！
这是代码：
bluetooth.java：
package com.csp.carservices;
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.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.ToggleButton;
import java.io.IOException;
import java.util.Set;
import java.util.UUID;
public class Bluetooth extends AppCompatActivity {
private final static UUID uuid = UUID.fromString("59b4fb6c-5c46-4867-93fc-f46e072f3b87");
// Create a BroadcastReceiver for ACTION_FOUND
private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// Whenever a remote Bluetooth device is found
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a ListView
adapter.add(bluetoothDevice.getName() + "\n"
+ bluetoothDevice.getAddress());
}
}
};
private BluetoothAdapter bluetoothAdapter;
private ToggleButton toggleButton;
private Button dis;
private ListView listview;
private ArrayAdapter adapter;
private static final int ENABLE_BT_REQUEST_CODE = 1;
private static final int DISCOVERABLE_BT_REQUEST_CODE = 2;
private static final int DISCOVERABLE_DURATION = 300;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bluetooth);
toggleButton = (ToggleButton) findViewById(R.id.toggleButton);
listview = (ListView) findViewById(R.id.listView);
adapter = new ArrayAdapter
(this,android.R.layout.simple_list_item_1);
listview.setAdapter(adapter);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String itemValue = (String) listview.getItemAtPosition(position);
String MAC = itemValue.substring(itemValue.length() - 17);
BluetoothDevice bluetoothDevice = bluetoothAdapter.getRemoteDevice(MAC);
// Initiate a connection request in a separate thread
ConnectingThread t = new ConnectingThread(bluetoothDevice);
t.start();
}
});
}
public void onToggleClicked(View view) {
adapter.clear();
ToggleButton toggleButton = (ToggleButton) view;
if (bluetoothAdapter == null) {
// Device does not support Bluetooth
Toast.makeText(getApplicationContext(), "Oop! Your device does not support Bluetooth",
Toast.LENGTH_SHORT).show();
toggleButton.setChecked(false);
} else {
if (toggleButton.isChecked()){ // to turn on bluetooth
if (!bluetoothAdapter.isEnabled()) {
// A dialog will appear requesting user permission to enable Bluetooth
Intent enableBluetoothIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBluetoothIntent, ENABLE_BT_REQUEST_CODE);
} else {
Toast.makeText(getApplicationContext(), "Your device has already been enabled." +
"\n" + "Scanning for remote Bluetooth devices...",
Toast.LENGTH_SHORT).show();
// To discover remote Bluetooth devices
discoverDevices();
// Make local device discoverable by other devices
makeDiscoverable();
ListeningThread t = new ListeningThread();
t.start();
}
} else { // Turn off bluetooth
bluetoothAdapter.disable();
adapter.clear();
Toast.makeText(getApplicationContext(), "Your device is now disabled.",
Toast.LENGTH_SHORT).show();
}
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == ENABLE_BT_REQUEST_CODE) {
// Bluetooth successfully enabled!
if (resultCode == Activity.RESULT_OK) {
Toast.makeText(getApplicationContext(), "Ha! Bluetooth is now enabled." +
"\n" + "Scanning for remote Bluetooth devices...",
Toast.LENGTH_SHORT).show();
// Make local device discoverable by other devices
makeDiscoverable();
// To discover remote Bluetooth devices
discoverDevices();
} else { // RESULT_CANCELED as user refused or failed to enable Bluetooth
Toast.makeText(getApplicationContext(), "Bluetooth is not enabled.",
Toast.LENGTH_SHORT).show();
// Turn off togglebutton
toggleButton.setChecked(false);
}
} else if (requestCode == DISCOVERABLE_BT_REQUEST_CODE){
if (resultCode == DISCOVERABLE_DURATION){
Toast.makeText(getApplicationContext(), "Your device is now discoverable by other devices for " +
DISCOVERABLE_DURATION + " seconds",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Fail to enable discoverability on your device.",
Toast.LENGTH_SHORT).show();
}
}
}
protected void discoverDevices(){
// To scan for remote Bluetooth devices
if (bluetoothAdapter.startDiscovery()) {
Toast.makeText(getApplicationContext(), "Discovering other bluetooth devices...",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Discovery failed to start.",
Toast.LENGTH_SHORT).show();
}
}
protected void makeDiscoverable(){
// Make local device discoverable
Intent discoverableIntent = new
Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, DISCOVERABLE_DURATION);
startActivityForResult(discoverableIntent, DISCOVERABLE_BT_REQUEST_CODE);
}
@Override
protected void onResume() {
super.onResume();
// Register the BroadcastReceiver for ACTION_FOUND
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(broadcastReceiver, filter);
}
@Override
protected void onPause() {
super.onPause();
this.unregisterReceiver(broadcastReceiver);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.bluetooth, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class ListeningThread extends Thread {
private final BluetoothServerSocket bluetoothServerSocket;
public ListeningThread() {
BluetoothServerSocket temp = null;
try {
temp = bluetoothAdapter.listenUsingRfcommWithServiceRecord(getString(R.string.app_name), uuid);
} catch (IOException e) {
e.printStackTrace();
}
bluetoothServerSocket = temp;
}
public void run() {
BluetoothSocket bluetoothSocket;
// This will block while listening until a BluetoothSocket is returned
// or an exception occurs
while (true) {
try {
bluetoothSocket = bluetoothServerSocket.accept();
} catch (IOException e) {
break;
}
// If a connection is accepted
if (bluetoothSocket != null) {
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(getApplicationContext(), "A connection has been accepted.",
Toast.LENGTH_SHORT).show();
}
});
// Code to manage the connection in a separate thread
/*
manageBluetoothConnection(bluetoothSocket);
*/
try {
bluetoothServerSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
// Cancel the listening socket and terminate the thread
public void cancel() {
try {
bluetoothServerSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private class ConnectingThread extends Thread {
private final BluetoothSocket bluetoothSocket;
private final BluetoothDevice bluetoothDevice;
public ConnectingThread(BluetoothDevice device) {
BluetoothSocket temp = null;
bluetoothDevice = device;
// Get a BluetoothSocket to connect with the given BluetoothDevice
try {
temp = bluetoothDevice.createRfcommSocketToServiceRecord(uuid);
} catch (IOException e) {
e.printStackTrace();
}
bluetoothSocket = temp;
}
public void run() {
// Cancel discovery as it will slow down the connection
bluetoothAdapter.cancelDiscovery();
try {
// This will block until it succeeds in connecting to the device
// through the bluetoothSocket or throws an exception
bluetoothSocket.connect();
} catch (IOException connectException) {
connectException.printStackTrace();
try {
bluetoothSocket.close();
} catch (IOException closeException) {
closeException.printStackTrace();
}
}
// Code to manage the connection in a separate thread
/*
manageBluetoothConnection(bluetoothSocket);
*/
}
// Cancel an open connection and terminate the thread
public void cancel() {
try {
bluetoothSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
activity_bluetooth.xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.csp.carservices.Bluetooth">
<ToggleButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/toggleButton"
android:textOn="Bluetooth On"
android:textOff="Bluetooth Off"
android:onClick="onToggleClicked"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/listView"
android:layout_centerHorizontal="true"
android:layout_below="@+id/toggleButton" />
</RelativeLayout>
任何人都可以帮忙吗？