我正在开发一个项目，通过蓝牙模块在Arduino和Android之间进行通信。但是当我运行它时，它会因非法的Argument异常而崩溃。这是java代码和logcat错误。请帮忙！
代码似乎太长了。但我希望只有蓝牙地址部分有问题。谢谢。
DeviceListActivity.java
package com.example.sparker.bluetoothintegrate;
import java.util.Set;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class DeviceListActivity extends Activity {
// Debugging for LOGCAT
private static final String TAG = "DeviceListActivity";
private static final boolean D = true;
// declare button for launching website and textview for connection status
Button tlbutton;
TextView textView1;
// EXTRA string to send on to mainactivity
public static String EXTRA_DEVICE_ADDRESS = "device_address";
// Member fields
private BluetoothAdapter mBtAdapter;
private ArrayAdapter<String> mPairedDevicesArrayAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.device_list);
}
@Override
public void onResume() {
super.onResume();
//***************
checkBTState();
textView1 = (TextView) findViewById(R.id.connecting);
textView1.setTextSize(40);
textView1.setText(" ");
// Initialize array adapter for paired devices
mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);
// Find and set up the ListView for paired devices
ListView pairedListView = (ListView) findViewById(R.id.paired_devices);
pairedListView.setAdapter(mPairedDevicesArrayAdapter);
pairedListView.setOnItemClickListener(mDeviceClickListener);
// Get the local Bluetooth adapter
mBtAdapter = BluetoothAdapter.getDefaultAdapter();
// Get a set of currently paired devices and append to 'pairedDevices'
Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();
// Add previosuly paired devices to the array
if (pairedDevices.size() > 0) {
findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);//make title viewable
for (BluetoothDevice device : pairedDevices) {
mPairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
}
} else {
String noDevices = getResources().getText(R.string.none_paired).toString();
mPairedDevicesArrayAdapter.add(noDevices);
}
}
// Set up on-click listener for the list (nicked this - unsure)
private OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
textView1.setText("Connecting...");
// Get the device MAC address, which is the last 17 chars in the View
String info = ((TextView) v).getText().toString();
String address = info.substring(info.length() - 17);
// Make an intent to start next activity while taking an extra which is the MAC address.
Intent i = new Intent(DeviceListActivity.this, MainActivity.class);
i.putExtra(EXTRA_DEVICE_ADDRESS, address);
startActivity(i);
}
};
private void checkBTState() {
// Check device has Bluetooth and that it is turned on
mBtAdapter = BluetoothAdapter.getDefaultAdapter(); // CHECK THIS OUT THAT IT WORKS!!!
if (mBtAdapter == null) {
Toast.makeText(getBaseContext(), "Device does not support Bluetooth", Toast.LENGTH_SHORT).show();
} else {
if (mBtAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth ON...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
}
MainActivity.java
package com.example.sparker.bluetoothintegrate;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.example.sparker.bluetoothintegrate.R;
public class MainActivity extends Activity {
Button btnOn, btnOff;
TextView txtArduino, txtString, txtStringLength, sensorView0, sensorView1, sensorView2, sensorView3;
Handler bluetoothIn;
final int handlerState = 0; //used to identify handler message
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private StringBuilder recDataString = new StringBuilder();
private ConnectedThread mConnectedThread;
// SPP UUID service - this should work for most devices
private static final UUID BTMODULEUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// String for MAC address
private static String address;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Link the buttons and textViews to respective views
btnOn = (Button) findViewById(R.id.buttonOn);
btnOff = (Button) findViewById(R.id.buttonOff);
txtString = (TextView) findViewById(R.id.txtString);
txtStringLength = (TextView) findViewById(R.id.testView1);
sensorView0 = (TextView) findViewById(R.id.sensorView0);
sensorView1 = (TextView) findViewById(R.id.sensorView1);
sensorView2 = (TextView) findViewById(R.id.sensorView2);
sensorView3 = (TextView) findViewById(R.id.sensorView3);
bluetoothIn = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == handlerState) { //if message is what we want
String readMessage = (String) msg.obj; // msg.arg1 = bytes from connect thread
recDataString.append(readMessage); //keep appending to string until ~
int endOfLineIndex = recDataString.indexOf("~"); // determine the end-of-line
if (endOfLineIndex > 0) { // make sure there data before ~
String dataInPrint = recDataString.substring(0, endOfLineIndex); // extract string
txtString.setText("Data Received = " + dataInPrint);
int dataLength = dataInPrint.length(); //get length of data received
txtStringLength.setText("String Length = " + String.valueOf(dataLength));
if (recDataString.charAt(0) == '#') //if it starts with # we know it is what we are looking for
{
String sensor0 = recDataString.substring(1, 5); //get sensor value from string between indices 1-5
String sensor1 = recDataString.substring(6, 10); //same again...
String sensor2 = recDataString.substring(11, 15);
String sensor3 = recDataString.substring(16, 20);
sensorView0.setText(" Sensor 0 Voltage = " + sensor0 + "V"); //update the textviews with sensor values
sensorView1.setText(" Sensor 1 Voltage = " + sensor1 + "V");
sensorView2.setText(" Sensor 2 Voltage = " + sensor2 + "V");
sensorView3.setText(" Sensor 3 Voltage = " + sensor3 + "V");
}
recDataString.delete(0, recDataString.length()); //clear all string data
// strIncom =" ";
dataInPrint = " ";
}
}
}
};
btAdapter = BluetoothAdapter.getDefaultAdapter(); // get Bluetooth adapter
checkBTState();
// Set up onClick listeners for buttons to send 1 or 0 to turn on/off LED
btnOff.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mConnectedThread.write("0"); // Send "0" via Bluetooth
Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
}
});
btnOn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mConnectedThread.write("1"); // Send "1" via Bluetooth
Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
}
});
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
return device.createRfcommSocketToServiceRecord(BTMODULEUUID);
//creates secure outgoing connecetion with BT device using UUID
}
@Override
public void onResume() {
super.onResume();
//Get MAC address from DeviceListActivity via intent
Intent intent = getIntent();
//Get the MAC address from the DeviceListActivty via EXTRA
address = intent.getStringExtra(com.example.sparker.bluetoothintegrate.DeviceListActivity.EXTRA_DEVICE_ADDRESS);
//create device and set the MAC address
BluetoothDevice device = btAdapter.getRemoteDevice(address);
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e) {
Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_LONG).show();
}
// Establish the Bluetooth socket connection.
try {
btSocket.connect();
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
//insert code to deal with this
}
}
mConnectedThread = new ConnectedThread(btSocket);
mConnectedThread.start();
//I send a character when resuming.beginning transmission to check device is connected
//If it is not an exception will be thrown in the write method and finish() will be called
mConnectedThread.write("x");
}
@Override
public void onPause() {
super.onPause();
try {
//Don't leave Bluetooth sockets open when leaving activity
btSocket.close();
} catch (IOException e2) {
//insert code to deal with this
}
}
//Checks that the Android device Bluetooth is available and prompts to be turned on if off
private void checkBTState() {
if (btAdapter == null) {
Toast.makeText(getBaseContext(), "Device does not support bluetooth", Toast.LENGTH_LONG).show();
} else {
if (btAdapter.isEnabled()) {
} else {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
//create new class for connect thread
private class ConnectedThread extends Thread {
private final InputStream mmInStream;
private final OutputStream mmOutStream;
//creation of the connect thread
public ConnectedThread(BluetoothSocket socket) {
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
//Create I/O streams for connection
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[256];
int bytes;
// Keep looping to listen for received messages
while (true) {
try {
bytes = mmInStream.read(buffer); //read bytes from input buffer
String readMessage = new String(buffer, 0, bytes);
// Send the obtained bytes to the UI Activity via handler
bluetoothIn.obtainMessage(handlerState, bytes, -1, readMessage).sendToTarget();
} catch (IOException e) {
break;
}
}
}
//write method
public void write(String input) {
byte[] msgBuffer = input.getBytes(); //converts entered String into bytes
try {
mmOutStream.write(msgBuffer); //write bytes over BT connection via outstream
} catch (IOException e) {
//if you cannot write, close the application
Toast.makeText(getBaseContext(), "Connection Failure", Toast.LENGTH_LONG).show();
finish();
}
}
}
}
Logcat错误：
04-14 11:24:55.527 12525-12525/? V/ActivityThread: Handling launch of ActivityRecord{5155e9d token=android.os.BinderProxy@75b4f12 {com.example.sparker.bluetoothintegrate/com.example.sparker.bluetoothintegrate.MainActivity}} startsNotResumed=false
04-14 11:24:55.555 12525-12525/? V/ActivityThread: ActivityRecord{5155e9d token=android.os.BinderProxy@75b4f12 {com.example.sparker.bluetoothintegrate/com.example.sparker.bluetoothintegrate.MainActivity}}: app=android.app.Application@34458e0, appName=com.example.sparker.bluetoothintegrate, pkg=com.example.sparker.bluetoothintegrate, comp={com.example.sparker.bluetoothintegrate/com.example.sparker.bluetoothintegrate.MainActivity}, dir=/data/app/com.example.sparker.bluetoothintegrate-1/base.apk
04-14 11:24:55.557 12525-12525/? W/Typeface: getVibeFontPathWithCTS(): fontPath = /system/fonts/DroidSansFallback.ttf
04-14 11:24:55.557 12525-12525/? W/Typeface: getVibeFontPathWithCTS(): fontName =
04-14 11:24:55.557 12525-12525/? W/Typeface: getVibeFontPathWithCTS(): isForceToSystemDefault = false
04-14 11:24:55.557 12525-12525/? W/Typeface: VIBEUI_setThemeFont(): Is Not a file:/system/fonts/DroidSansFallback.ttf
04-14 11:24:55.571 12525-12525/? E/MultiWindowProxy: getServiceInstance failed!
04-14 11:24:55.572 12525-12525/? D/wangcy9: not using Theme.DeviceDefault / Theme.DeviceDefault.Light
04-14 11:24:55.593 12525-12533/? I/System: FinalizerDaemon: finalize objects = 4
04-14 11:24:55.594 12525-12525/? D/BluetoothAdapter: isEnabled
04-14 11:24:55.596 12525-12525/? V/ActivityThread: Performing resume of ActivityRecord{5155e9d token=android.os.BinderProxy@75b4f12 {com.example.sparker.bluetoothintegrate/com.example.sparker.bluetoothintegrate.MainActivity}}
04-14 11:24:55.606 12525-12525/? D/AndroidRuntime: Shutting down VM
04-14 11:24:55.607 12525-12525/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.sparker.bluetoothintegrate, PID: 12525
java.lang.RuntimeException: Unable to resume activity {com.example.sparker.bluetoothintegrate/com.example.sparker.bluetoothintegrate.MainActivity}: java.lang.IllegalArgumentException: null is not a valid Bluetooth address
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3333)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3364)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2671)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1493)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5769)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
Caused by: java.lang.IllegalArgumentException: null is not a valid Bluetooth address
at android.bluetooth.BluetoothDevice.<init>(BluetoothDevice.java:667)
at android.bluetooth.BluetoothAdapter.getRemoteDevice(BluetoothAdapter.java:631)
at com.example.sparker.bluetoothintegrate.MainActivity.onResume(MainActivity.java:127)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1269)
at android.app.Activity.performResume(Activity.java:6691)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3318)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3364)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2671)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1493)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5769)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
04-14 11:24:59.681 12525-12525/? I/Process: Sending signal. PID: 12525 SIG: 9
答案 0 :(得分：0)
Match: 0通过使用以上代码，我试图解决我的问题，希望对您有所帮助。
//create device and set the MAC address
BluetoothDevice device = btAdapter.getRemoteDevice(address);
try {
if (BluetoothAdapter.checkBluetoothAddress(address)) {
//It is a valid MAC address.
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
btSocket = createBluetoothSocket(device);
} else {
Toast.makeText(mContext, "Invalid MAC: Address", Toast.LENGTH_LONG).show();
}
} catch (IllegalArgumentException | IllegalStateException e) {
e.printStackTrace();
}
该库将为您提供帮助。