Android App：
private static final String TAG = "HC-05";
Button btnReceive;
TextView txtReading;
Handler h;
ImageView imv1, imv2, imv3, imv4;
int s1=0, s2=0;
final int RECIEVE_MESSAGE = 1; // Status for Handler
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private StringBuilder sb = new StringBuilder();
private ConnectedThread mConnectedThread;
// SPP UUID service
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// MAC-address of Bluetooth module (you must edit this line)
private static String address = "98:D3:31:80:57:0D";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imv1 =(ImageView) findViewById(R.id.imageView1);
imv2 =(ImageView) findViewById(R.id.imageView2);
imv3 =(ImageView) findViewById(R.id.imageView3);
imv4 =(ImageView) findViewById(R.id.imageView4);
btnReceive = (Button) findViewById(R.id.btnReceive); // button LED OFF
txtReading = (TextView) findViewById(R.id.txtReading);
h = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case RECIEVE_MESSAGE: // if receive massage
byte[] readBuf = (byte[]) msg.obj;
String strIncom = new String(readBuf, 0, msg.arg1); // create string from bytes array
sb.append(strIncom); // append string
int endOfLineIndex = sb.indexOf("\r\n"); // determine the end-of-line
if (endOfLineIndex > 0) { // if end-of-line,
String sbprint = sb.substring(0, endOfLineIndex); // extract string
sb.delete(0, sb.length()); // and clear
txtReading.setText("Data from Arduino: " + sbprint);
//System.out.println(sbprint);
**if(sbprint!=null || !"0".equals(sbprint)){
s2 = Integer.parseInt(sbprint);
initOpacity();
}**
// update TextView
btnReceive.setEnabled(true);
// if(!"".equals(sbprint)){
// }
// else
// {
// s2=0;
// }
System.out.println("================== VAlUE BT = " +s2+ "===================");
}
//Log.d(TAG, "...String:"+ sb.toString() + "Byte:" + msg.arg1 + "...");
break;
}
};
};
btAdapter = BluetoothAdapter.getDefaultAdapter(); // get Bluetooth adapter
checkBTState();
/* btnReceive.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
btnReceive.setEnabled(false);
mConnectedThread.write("1"); // Send "1" via Bluetooth
//Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
}
});*/
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
if(Build.VERSION.SDK_INT >= 10){
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
return (BluetoothSocket) m.invoke(device, MY_UUID);
} catch (Exception e) {
Log.e(TAG, "Could not create Insecure RFComm Connection",e);
}
}
return device.createRfcommSocketToServiceRecord(MY_UUID);
}
@Override
public void onResume() {
super.onResume();
Log.d(TAG, "...onResume - try connect...");
// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);
// Two things are needed to make a connection:
// A MAC address, which we got above.
// A Service ID or UUID. In this case we are using the
// UUID for SPP.
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and socket create failed: " + e.getMessage() + ".");
}
// Discovery is resource intensive. Make sure it isn't going on
// when you attempt to connect and pass your message.
btAdapter.cancelDiscovery();
// Establish the connection. This will block until it connects.
Log.d(TAG, "...Connecting...");
try {
btSocket.connect();
Log.d(TAG, "....Connection ok...");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
}
}
// Create a data stream so we can talk to server.
Log.d(TAG, "...Create Socket...");
mConnectedThread = new ConnectedThread(btSocket);
mConnectedThread.start();
}
@Override
public void onPause() {
super.onPause();
Log.d(TAG, "...In onPause()...");
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
}
}
private void checkBTState() {
// Check for Bluetooth support and then check to make sure it is turned on
// Emulator doesn't support Bluetooth and will return null
if(btAdapter==null) {
errorExit("Fatal Error", "Bluetooth not support");
} else {
if (btAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth ON...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
private void errorExit(String title, String message){
Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
finish();
}
private class ConnectedThread extends Thread {
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[256]; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer); // Get number of bytes and message in "buffer"
h.obtainMessage(RECIEVE_MESSAGE, bytes, -1, buffer).sendToTarget(); // Send to message queue Handler
} catch (IOException e) {
break;
}
}
}
/* Call this from the main activity to send data to the remote device */
public void write(String message) {
Log.d(TAG, "...Data to send: " + message + "...");
byte[] msgBuffer = message.getBytes();
try {
mmOutStream.write(msgBuffer);
} catch (IOException e) {
Log.d(TAG, "...Error data send: " + e.getMessage() + "...");
}
}
}
public void initOpacity()
{
if( s2 < 100)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha1);
imv1.startAnimation(an);
}
else if(s2 > 100 && s2 < 200)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha2);
imv1.startAnimation(an);
}
else if(s2 > 200 && s2 < 300)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha3);
imv1.startAnimation(an);
}
else if(s2 > 300 && s2 < 400)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha4);
imv1.startAnimation(an);
}
else if(s2 > 400 && s2 < 500)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha5);
imv1.startAnimation(an);
}
else if(s2 > 500 && s2 < 600)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha6);
imv1.startAnimation(an);
}
else if(s2 > 600 && s2 < 700)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha7);
imv1.startAnimation(an);
}
else if(s2 > 700 && s2 < 800)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha8);
imv1.startAnimation(an);
}
else if(s2 > 800 && s2 < 900)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha9);
imv1.startAnimation(an);
}
else if(s2 > 900)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha10);
imv1.startAnimation(an);
}
//i2
if( s2 < 100)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha1);
imv2.startAnimation(an);
}
else if(s2 > 100 && s2 < 200)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha2);
imv2.startAnimation(an);
}
else if(s2 > 200 && s2 < 300)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha3);
imv2.startAnimation(an);
}
else if(s2 > 300 && s2 < 400)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha4);
imv2.startAnimation(an);
}
else if(s2 > 400 && s2 < 500)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha5);
imv2.startAnimation(an);
}
else if(s2 > 500 && s2 < 600)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha6);
imv2.startAnimation(an);
}
else if(s2 > 600 && s2 < 700)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha7);
imv2.startAnimation(an);
}
else if(s2 > 700 && s2 < 800)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha8);
imv2.startAnimation(an);
}
else if(s2 > 800 && s2 < 900)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha9);
imv2.startAnimation(an);
}
else if(s2 > 900)
{
Animation an = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha10);
imv2.startAnimation(an);
}
//Right Foot Blank
Animation an1 = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha0);
imv3.startAnimation(an1);
Animation an2 = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha0);
imv4.startAnimation(an2);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}}
Arduino蓝牙：
#include <SoftwareSerial.h>// import the serial library
SoftwareSerial Genotronex(10, 11); // RX, TX
int BluetoothData; // the data given from Computer
int sensorPin = A0;
int sensorValue = 0;
int ledPin = 13;
void setup() {
Genotronex.begin(9600);
pinMode(ledPin, OUTPUT);
}
void loop() {
// put your main code here, to run repeatedly:
sensorValue = analogRead(sensorPin);
Genotronex.println(sensorValue);
delay(500);
}
logcat的：
01-29 17:17:11.637: I/System.out(1776): ================== VAlUE BT = 0===================
01-29 17:17:11.797: I/System.out(1776): ================== VAlUE BT = 777===================
01-29 17:17:12.327: I/System.out(1776): ================== VAlUE BT = 975===================
01-29 17:17:12.807: I/System.out(1776): ================== VAlUE BT = 669===================
01-29 17:17:13.327: I/System.out(1776): ================== VAlUE BT = 971===================
01-29 17:17:13.817: I/System.out(1776): ================== VAlUE BT = 224===================
01-29 17:17:14.327: D/AndroidRuntime(1776): Shutting down VM
01-29 17:17:14.327: E/AndroidRuntime(1776): FATAL EXCEPTION: main
01-29 17:17:14.327: E/AndroidRuntime(1776): Process: com.example.blutooth, PID: 1776
01-29 17:17:14.327: E/AndroidRuntime(1776): java.lang.NumberFormatException: Invalid int: "
"
01-29 17:17:14.327: E/AndroidRuntime(1776): at java.lang.Integer.invalidInt(Integer.java:138)
01-29 17:17:14.327: E/AndroidRuntime(1776): at java.lang.Integer.parse(Integer.java:410)
01-29 17:17:14.327: E/AndroidRuntime(1776): at java.lang.Integer.parseInt(Integer.java:367)
01-29 17:17:14.327: E/AndroidRuntime(1776): at java.lang.Integer.parseInt(Integer.java:334)
01-29 17:17:14.327: E/AndroidRuntime(1776): at com.example.blutooth.MainActivity$1.handleMessage(MainActivity.java:88)
01-29 17:17:14.327: E/AndroidRuntime(1776): at android.os.Handler.dispatchMessage(Handler.java:102)
01-29 17:17:14.327: E/AndroidRuntime(1776): at android.os.Looper.loop(Looper.java:145)
01-29 17:17:14.327: E/AndroidRuntime(1776): at android.app.ActivityThread.main(ActivityThread.java:5944)
01-29 17:17:14.327: E/AndroidRuntime(1776): at java.lang.reflect.Method.invoke(Native Method)
01-29 17:17:14.327: E/AndroidRuntime(1776): at java.lang.reflect.Method.invoke(Method.java:372)
01-29 17:17:14.327: E/AndroidRuntime(1776): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
01-29 17:17:14.327: E/AndroidRuntime(1776): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
当传感器的值低于10时，我的应用程序崩溃了。 我试图过滤's2'以填充来自arduino的数据，只有当存在整数值时。但不知怎的，它仍然以同样的错误崩溃。 我在这里错过了什么吗？
答案 0 :(得分：0)
发生java.lang.NumberFormatException，因此您检查字符串是否为空或null然后转换为int
if(sbprint!=null || !"0".equals(sbprint)){
s2 = Integer.parseInt(sbprint);
initOpacity();
}
改为
if((sbprint!= null) && (!sbprint.isEmpty())){
isNumeric(String sbprint)
{
s2 = Integer.parseInt(sbprint);
initOpacity();
}
else
{
//your string not in numeric format
}
}
并使用下面的代码检查您的字符串是否为数字格式。source
public static boolean isNumeric(String str)
{
try
{
double d = Double.parseDouble(str);
}
catch(NumberFormatException nfe)
{
return false;
}
return true;
}
答案 1 :(得分：0)
如果我弄错了..检查字符串\n ..
if(sbprint!=null && !("0".equals(sbprint)) && !(sbprint.contains("\n"))){
s2 = Integer.parseInt(sbprint);
initOpacity();
}
答案 2 :(得分：0)
事实证明问题出现在这一行：String sbprint = sb.substring(0, endOfLineIndex);
我在行尾添加了trim（），现在没有问题。
String sbprint = sb.substring(0, endOfLineIndex).trim();
我还使用了来自@sasikumar的if语句：
if(sbprint!=null && (!sbprint.isEmpty()) && !(sbprint.contains("\n"))){
s2 = Integer.parseInt(sbprint);
initOpacity();
}
感谢您的帮助！