在android程序中尝试连接连接arduino的蓝牙模块HC-05时发生错误

Question

我试图通过蓝牙模块HC-05交换arduino和android手机之间的数据，从3-4天开始，我无法识别以下错误的情况:

([JSR82] connect: Connection is not created (failed or aborted).) occurred while try to connect with already paired bluetooth module using its MAC address.

我也发布了我的MainActivity.java, activity_main.xml文件和arduino代码。

Main Activity java文件:-

package bluetooth.majorproject.bt;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Set;

public class MainActivity extends Activity {
    //Button btnScan;
    ListView lvDevices;
    ArrayAdapter<String> listAdapter;
    BluetoothAdapter adapter;
    ArrayList<String> pairedDevices;
    BroadcastReceiver receiver;
    IntentFilter filter;;
    Set<BluetoothDevice> devicesArray;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        adapter=BluetoothAdapter.getDefaultAdapter();
        if(adapter==null){
            Log.d("Bt","This device doesnot support bluetooth");
            finish();
        }
        else if(!adapter.enable()){
            turnOnBt();
        }
        init();
        getPairedDevices();
        startDiscovery();
    }
    private void init() {
        lvDevices=(ListView)findViewById(R.id.lvDevices);
       // btnScan=(Button)findViewById(R.id.btnScan);
        listAdapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,0);
        lvDevices.setAdapter(listAdapter);
        adapter=BluetoothAdapter.getDefaultAdapter();
        startDiscovery();
        pairedDevices=new ArrayList<String>();
        filter=new IntentFilter(BluetoothDevice.ACTION_FOUND);
        registerReceiver(receiver,filter);
        receiver=new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                String action=intent.getAction();
                if(BluetoothDevice.ACTION_FOUND.equals(action)){
                    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    Log.d("Bt","Device Found :"+device.getName());
                    String strTmp="";
                    for(int a=0;a<pairedDevices.size();a++){
                        if(device.getAddress().equals(pairedDevices.get(a))){
                            strTmp="(Paired)";
                            break;
                        }
                    }
                    //PA to writing
                    listAdapter.add(device.getName()+" "+device.getAddress());
                    lvDevices.setAdapter(listAdapter);

                }else  if(BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){
                    Log.d("Bt", " Scanning Devices.. ");
                }else  if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
                    adapter.cancelDiscovery();
                    if(!devicesArray.isEmpty()){
                        lvDevices.setAdapter(listAdapter);
                    }else {
                        Log.d("Bt","Devices Not Found!!");
                    }
                }else  if(BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)){
                    if(adapter.getState() == adapter.STATE_OFF) {
                        Log.d("Bt","Bluetooth must be enabled to run this app.!!");
                    }
                }
            }
        };
        filter=new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
        registerReceiver(receiver,filter);
        filter=new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        registerReceiver(receiver,filter);
        filter=new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
        registerReceiver(receiver,filter);
    }
    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(receiver);
    }
    private void startDiscovery() {
        if(adapter.isDiscovering())
            adapter.cancelDiscovery();
        adapter.startDiscovery();
    }
    private void getPairedDevices() {
        devicesArray=adapter.getBondedDevices();
        if(devicesArray.size()>0){
            for(BluetoothDevice device:devicesArray) {
                pairedDevices.add(device.getName() + " " + device.getAddress());
                listAdapter.add(device.getName()+"n"+device.getAddress());
            }
        }
        lvDevices.setAdapter(listAdapter);
    }
    private void turnOnBt() {
        Intent intent=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivity(intent);
    }
}

activity_main xml文件:-

<LinearLayout 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=".MainActivity"
    android:orientation="vertical"
    android:weightSum="1">

    <Button
        android:id="@+id/turnBTOn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#000099"
        android:text="Turn Bt On"
        android:textColor="#ffffff" />
    <Button
        android:id="@+id/Connect"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#83FF83"
        android:enabled="false"
        android:text="Connect" />
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/btnLedOn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="#00ff00"
        android:enabled="false"
        android:text="Turn On Led" />
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/btnLedOff"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="#FF0000"
        android:enabled="false"
        android:text="Turn Off Led" />
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/turnBTOff"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#000099"
        android:text="Turn Bt Off"
        android:textColor="#ffffff" />
</LinearLayout>

Arduino Code .ino file:-

/* Bluetooth control of Robot via inputs from Android phone via custom designed android app */
unsigned char myByte = ' ';
int ledPin = 13;
int ledPin2 = 12;
boolean toglVal = HIGH;
unsigned char flag = 0;
// Prior set up of arduino i/0s
void setup()
{
  pinMode(ledPin, OUTPUT);
  pinMode(ledPin2,OUTPUT);
  /* ------ define the pins of outputs as per need 
  .
  .
  .
  */
  digitalWrite(ledPin, LOW);
  digitalWrite(ledPin2, LOW);
  Serial.begin(9600);
  Serial.flush();
}
void loop()
{
  Serial.flush();
  if (Serial.available())
  {
  myByte = Serial.read();
  switch(myByte)
  {
    case '1':
    flag = 1;
    break;
    case '0':
    flag = 2;
    break;
    /* ------ define the cases as per the code in android app as per need 
  .
  .
  .
  */
    default:
    digitalWrite(ledPin,LOW);
  }
  }
  while(flag == 1)
  {
    digitalWrite(ledPin,toglVal);
    delay(1000);
    digitalWrite(ledPin2,~toglVal);
    delay(1000);
    if (Serial.available()) break;   
  }
  while(flag == 2)
  {
    digitalWrite(ledPin2,toglVal);
    delay(500);
    digitalWrite(ledPin,~toglVal);
    delay(500);
    if (Serial.available()) break;
  }
 }

谁来帮帮我。

Answer 1

应该避免在主循环()中使用while循环。While不会让程序执行下一条指令，除非While内的条件满足。它将继续在那里等待。它将进入一个无限while循环，永远不会出来。考虑使用if()循环。