我试图编写代码我可以将加速计传感器的所有结果值写入.txt文件。我不能以某种方式写出所有数据。我认为我的循环中存在问题。它只是读取大约10到15个样本。 如何在关闭按钮停止之前，如何将传感器的所有值写入该文件？这是我写的代码。 提前致谢！
public class MainActivity extends Activity implements SensorEventListener {
public SensorManager sm;
Sensor accelermeter;
private static final String DEBUG = "LogAccelermeter";
ToggleButton OnStore;
Button OffStore;
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");
TextView sensorText;
// String for MAC address
private static String address;
private GestureDetectorCompat mDetector;
FileOutputStream fileOutputStream;
double TotalAccelerate;
ArrayList<Double> list;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = new ArrayList<Double>();
//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);
//for Accelermeter
sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
sensorText = (TextView) findViewById(R.id.sensor);
accelermeter = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sm.registerListener(this, accelermeter, SensorManager.SENSOR_DELAY_NORMAL);
mDetector = new GestureDetectorCompat(this, new MyGestureListener());
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
File Root = Environment.getExternalStorageDirectory();
File dir = new File(Root.getAbsolutePath() + "/MyApp");
if (!dir.exists()) {
dir.mkdir();
}
File file = new File(dir, "MyMessage.txt");
try {
fileOutputStream = new FileOutputStream(file, true);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
} else {
Toast.makeText(getApplicationContext(), "SDcard not found", Toast.LENGTH_LONG).show();
}
OnStore = (ToggleButton) findViewById(R.id.onStore);
OnStore.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
if (OnStore.isChecked()){
try {
for(double TotalAccelerate : list){
// System.out.println("final"+ TotalAccelerate);
String space = "\n";
byte[] convert = space.getBytes();
fileOutputStream.write(convert);
String finalData;
finalData = String.valueOf(TotalAccelerate);
fileOutputStream.write(finalData.getBytes());
Log.i(DEBUG, "ans: " + finalData);
}
// fileOutputStream.close();
Toast.makeText(getApplicationContext(), "Message saving", Toast.LENGTH_LONG).show();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}if (!OnStore.isChecked()){
try {
fileOutputStream.flush();
} catch (IOException e) {
e.printStackTrace();
}
try {
fileOutputStream.close();
list.clear();
Collections.synchronizedList(list);
} catch (IOException e) {
e.printStackTrace();
}
Toast.makeText(getApplicationContext(),"Message Stopped.",Toast.LENGTH_LONG).show();
}
}
});
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();
}
});
}//end OnCreate Method
@Override
public final void onAccuracyChanged(Sensor sensor, int accuracy) {
// Do something here if sensor accuracy changes.
}
@Override
public final void onSensorChanged(SensorEvent event) {
// The light sensor returns a single value.
// Many sensors return 3 values, one for each axis.
double xx = event.values[0];
double yy = event.values[1];
double zz = event.values[2];
TotalAccelerate = Math.round(Math.sqrt(Math.pow(xx, 2)
+ Math.pow(yy, 2)
+ Math.pow(zz, 2)));
Log.i(DEBUG, "Accelerometer = " + TotalAccelerate);
list.add(TotalAccelerate);
findPeaks(list);
sensorText.setText("Total: " + TotalAccelerate);
Log.i(DEBUG, "list values " + list);
}
//Find peak values.
public static ArrayList<Double> findPeaks(List<Double> points) {
ArrayList<Double> peaks = new ArrayList<Double>();
if (points == null || points.size() < 1)
return peaks;
Double x1_n_ref = 0.0;
int alpha = 0; //0=down, 1=up.
int size = points.size();// -1)/100;
for (int i = 0; i < size; i += 5) {
Double IndexValues = points.get(i);
if (IndexValues > 9) {
Double delta = (x1_n_ref - IndexValues);
if (delta < 0) {
x1_n_ref = IndexValues;
alpha = 1;
} else if (alpha == 1 && delta > 0) {
peaks.add(x1_n_ref);
alpha = 0;
}
} else if (alpha == 0) {
x1_n_ref = IndexValues;
}
}
return peaks;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
this.mDetector.onTouchEvent(event);
return super.onTouchEvent(event);
}
class MyGestureListener extends GestureDetector.SimpleOnGestureListener {
private static final String DEBUG_TAG = "Gestures";
@Override
public boolean onDown(MotionEvent event) {
Log.d(DEBUG_TAG, "onDown: " + event.toString());
Toast.makeText(getApplication(), "OnDown Touch Occur", Toast.LENGTH_LONG).show();
if (event.getX() > 0) {
mConnectedThread.write("1");
}
return true;
}
@Override
public void onLongPress(MotionEvent event) {
Log.d(DEBUG_TAG, "onLongPress: " + event.toString());
mConnectedThread.write("0");
}
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(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();
}
}
}
}
答案 0 :(得分：0)
你可以尝试使用onClick按钮onClick回调吗？它应该在未选中时写入所有数据。
OnStore.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
if (OnStore.isChecked()){
// should do nothing
} else if (!OnStore.isChecked()){
try {
for(double TotalAccelerate : list){
//System.out.println("final"+ TotalAccelerate);
String space = "\n";
byte[] convert = space.getBytes();
fileOutputStream.write(convert);
String finalData;
finalData = String.valueOf(TotalAccelerate);
fileOutputStream.write(finalData.getBytes());
Log.i(DEBUG, "ans: " + finalData);
}
fileOutputStream.flush();
fileOutputStream.close();
Toast.makeText(getApplicationContext(), "Message saving", Toast.LENGTH_LONG).show();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Toast.makeText(getApplicationContext(),"Message Stopped.",Toast.LENGTH_LONG).show();
}
}
});
要规范代码以启动/停止侦听传感器事件，请在此类的某处添加以下变量：
private boolean isListening = false;
对现有代码进行以下修改：
OnStore.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
if (OnStore.isChecked()){
//
// set listening flag to true
//
isListening = true;
} else if (!OnStore.isChecked()){
//
// set listening flag to false
//
isListening = false;
try {
for(double TotalAccelerate : list){
//System.out.println("final"+ TotalAccelerate);
String space = "\n";
byte[] convert = space.getBytes();
fileOutputStream.write(convert);
String finalData;
finalData = String.valueOf(TotalAccelerate);
fileOutputStream.write(finalData.getBytes());
Log.i(DEBUG, "ans: " + finalData);
}
fileOutputStream.flush();
fileOutputStream.close();
Toast.makeText(getApplicationContext(), "Message saving", Toast.LENGTH_LONG).show();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Toast.makeText(getApplicationContext(),"Message Stopped.",Toast.LENGTH_LONG).show();
}
}
});
@Override
public final void onSensorChanged(SensorEvent event) {
// The light sensor returns a single value.
// Many sensors return 3 values, one for each axis.
//
// regulate
//
if (isListening) {
double xx = event.values[0];
double yy = event.values[1];
double zz = event.values[2];
TotalAccelerate = Math.round(Math.sqrt(Math.pow(xx, 2)
+ Math.pow(yy, 2)
+ Math.pow(zz, 2)));
Log.i(DEBUG, "Accelerometer = " + TotalAccelerate);
list.add(TotalAccelerate);
findPeaks(list);
sensorText.setText("Total: " + TotalAccelerate);
Log.i(DEBUG, "list values " + list);
}
}