Java：双数组中的乘法值
我正在开发一个Android应用程序，它将传感器数据记录到SQLite数据库中 程序如下所示：Java：双数组中的乘法值,java,android,arrays,sqlite,android-sensors,Java,Android,Arrays,Sqlite,Android Sensors,我正在开发一个Android应用程序，它将传感器数据记录到SQLite数据库中 程序如下所示： 将传感器的所有值添加到双阵列。每个维度一个双数组，例如，对于加速计，我有3个双数组（一个用于x值，一个用于y值，一个用于z值） 当所有值都在双数组中时，请将双数组转换为字符串 将字符串放入SQLite表中的相关列 当我将每个双数组中的值相乘时，我遇到了一个问题 下面是代码片段： @Override public void onSensorChanged(final SensorEvent sensor
@Override
public void onSensorChanged(final SensorEvent sensorEvent) {
if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
//Getting and displaying accelerometer data
x = sensorEvent.values[0];
y = sensorEvent.values[1];
z = sensorEvent.values[2];
}
if (sensorEvent.sensor.getType() == Sensor.TYPE_GYROSCOPE) {
//Getting and displaying gyroscope data
x2 = sensorEvent.values[0];
y2 = sensorEvent.values[1];
z2 = sensorEvent.values[2];
}
if (sensorEvent.sensor.getType() == Sensor.TYPE_ROTATION_VECTOR) {
//Getting and displaying gyroscope data
x3 = sensorEvent.values[0]; // x*sin(θ/2)
y3 = sensorEvent.values[1]; // y*sin(θ/2)
z3 = sensorEvent.values[2]; // z*sin(θ/2)
cos3 = sensorEvent.values[3]; // cos(θ/2)
accuracy3 = sensorEvent.values[4]; // estimated heading Accuracy (in radians) (-1 if unavailable)
}
//Start recording sensor data on click
Button startButton = (Button) findViewById(R.id.buttonStart);
startButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Get label from EditText
label = textLabel.getText().toString();
statusText.setText("Wait");
statusText.setTextColor(Color.RED);
//Get current date and time
currentTime = Calendar.getInstance().getTime();
dateTime = currentTime.toString();
flag = true; //flag set to true = record data
samples = 0;
startTime = System.currentTimeMillis();
}
});
//Insert given number of sensor data samples into database
if (samples < samples_total) {
if (flag == true) {
//Get current date and time
currentTime = Calendar.getInstance().getTime();
dateTime = currentTime.toString();
//Add x,y,z values to arrays for sensors
accDoubleArrayX[samples] = x;
accDoubleArrayY[samples] = y;
accDoubleArrayZ[samples] = z;
gyroDoubleArrayX[samples] = x2;
gyroDoubleArrayY[samples] = y2;
gyroDoubleArrayZ[samples] = z2;
rotationDoubleArrayX[samples] = x3;
rotationDoubleArrayY[samples] = y3;
rotationDoubleArrayZ[samples] = z3;
rotationDoubleArrayCos[samples] = cos3;
rotationDoubleArrayAccuracy[samples] = accuracy3;
samples++;
} else {
//Log.d("", "samples < total but Flag is false - Data NOT inserted");
}
} else if (samples == samples_total) {
durationTime = System.currentTimeMillis() - startTime;
//Insert x,y,z values for sensors
dbRef.insertData(dateTime, accDoubleArrayX, accDoubleArrayY, accDoubleArrayZ,
gyroDoubleArrayX, gyroDoubleArrayY, gyroDoubleArrayZ,
rotationDoubleArrayX, rotationDoubleArrayY, rotationDoubleArrayZ, rotationDoubleArrayCos, rotationDoubleArrayAccuracy,
durationTime, label);
Log.d("", "Data inserted!");
Toast.makeText(this, "Data inserted!", Toast.LENGTH_LONG).show();
//Stop recording when given number of samples inserted
flag = false;
samples++;
} else {
//Not in use
}
}
accDoubleArrayX: [2.013523578643799, 2.013523578643799, 2.013523578643799, 2.492363929748535, 2.492363929748535, 2.492363929748535, -7.771578788757324, -7.771578788757324, -7.771578788757324, 2.0913352966308594, 2.0913352966308594, 2.0913352966308594, 9.205705642700195, 9.205705642700195, 9.205705642700195, -2.649184226989746, -2.649184226989746, -2.649184226989746, 0.851138710975647, 0.851138710975647, 0.851138710975647, 1.4508862495422363, 1.4508862495422363, 1.4508862495422363, 3.1938650608062744, 3.1938650608062744, 3.1938650608062744, 1.7621324062347412, 1.7621324062347412, 1.7621324062347412, -5.260061264038086, -5.260061264038086]
accDoubleArrayY: [5.456385612487793, 5.456385612487793, 5.456385612487793, 7.893682956695557, 7.893682956695557, 7.893682956695557, 3.6786909103393555, 3.6786909103393555, 3.6786909103393555, 2.8095955848693848, 2.8095955848693848, 2.8095955848693848, 6.449979305267334, 6.449979305267334, 6.449979305267334, 5.60602331161499, 5.60602331161499, 5.60602331161499, 5.076904773712158, 5.076904773712158, 5.076904773712158, -0.05985504388809204, -0.05985504388809204, -0.05985504388809204, 2.78086519241333, 2.78086519241333, 2.78086519241333, 6.861782073974609, 6.861782073974609, 6.861782073974609, 4.49870491027832, 4.49870491027832]
accDoubleArrayZ: [18.986019134521484, 18.986019134521484, 18.986019134521484, 0.5770025849342346, 0.5770025849342346, 0.5770025849342346, 6.994660377502441, 6.994660377502441, 6.994660377502441, 13.217190742492676, 13.217190742492676, 13.217190742492676, 2.6240451335906982, 2.6240451335906982, 2.6240451335906982, -9.330204010009766, -9.330204010009766, -9.330204010009766, 9.876082420349121, 9.876082420349121, 9.876082420349121, 13.722367286682129, 13.722367286682129, 13.722367286682129, 4.235342979431152, 4.235342979431152, 4.235342979431152, -10.040084838867188, -10.040084838867188, -10.040084838867188, -1.8638859987258911, -1.8638859987258911]
gyroDoubleArrayX: [-0.575242817401886, 0.14913702011108398, 0.14913702011108398, 0.14913702011108398, 2.141181468963623, 2.141181468963623, 2.141181468963623, -4.218447208404541, -4.218447208404541, -4.218447208404541, -0.030892670154571533, -0.030892670154571533, -0.030892670154571533, 5.554288864135742, 5.554288864135742, 5.554288864135742, -2.211488962173462, -2.211488962173462, -2.211488962173462, -5.499960422515869, -5.499960422515869, -5.499960422515869, -1.3646037578582764, -1.3646037578582764, -1.3646037578582764, 7.179882526397705, 7.179882526397705, 7.179882526397705, 1.353951096534729, 1.353951096534729, 1.353951096534729, -5.861084938049316]
gyroDoubleArrayY: [-0.4165183901786804, -1.6266587972640991, -1.6266587972640991, -1.6266587972640991, -1.0279802083969116, -1.0279802083969116, -1.0279802083969116, 3.4663705825805664, 3.4663705825805664, 3.4663705825805664, -7.069095134735107, -7.069095134735107, -7.069095134735107, 0.3334277868270874, 0.3334277868270874, 0.3334277868270874, 2.221076488494873, 2.221076488494873, 2.221076488494873, -0.21944448351860046, -0.21944448351860046, -0.21944448351860046, -3.3257555961608887, -3.3257555961608887, -3.3257555961608887, 0.04580637067556381, 0.04580637067556381, 0.04580637067556381, 0.3419498801231384, 0.3419498801231384, 0.3419498801231384, 1.2857742309570312]
gyroDoubleArrayZ: [0.0649811327457428, -0.18002969026565552, -0.18002969026565552, -0.18002969026565552, 0.2865561246871948, 0.2865561246871948, 0.2865561246871948, -0.7233145833015442, -0.7233145833015442, -0.7233145833015442, -0.6796387434005737, -0.6796387434005737, -0.6796387434005737, -1.1739214658737183, -1.1739214658737183, -1.1739214658737183, -3.5452001094818115, -3.5452001094818115, -3.5452001094818115, -0.014913702383637428, -0.014913702383637428, -0.014913702383637428, -0.6348975896835327, -0.6348975896835327, -0.6348975896835327, -0.9310411214828491, -0.9310411214828491, -0.9310411214828491, -2.379800796508789, -2.379800796508789, -2.379800796508789, -0.6317018270492554]
rotationDoubleArrayX: [0.2823379933834076, 0.2823379933834076, 0.26849400997161865, 0.26849400997161865, 0.26849400997161865, 0.2820430099964142, 0.2820430099964142, 0.2820430099964142, 0.35002198815345764, 0.35002198815345764, 0.35002198815345764, 0.20867300033569336, 0.20867300033569336, 0.20867300033569336, 0.2366899996995926, 0.2366899996995926, 0.2366899996995926, 0.39944401383399963, 0.39944401383399963, 0.39944401383399963, 0.3354569971561432, 0.3354569971561432, 0.3354569971561432, 0.17095300555229187, 0.17095300555229187, 0.17095300555229187, 0.1272200047969818, 0.1272200047969818, 0.1272200047969818, 0.34220200777053833, 0.34220200777053833, 0.34220200777053833]
rotationDoubleArrayY: [0.10564299672842026, 0.10564299672842026, 0.08853700011968613, 0.08853700011968613, 0.08853700011968613, 0.04211900010704994, 0.04211900010704994, 0.04211900010704994, 0.01869099959731102, 0.01869099959731102, 0.01869099959731102, 0.1025020033121109, 0.1025020033121109, 0.1025020033121109, -0.10204900056123734, -0.10204900056123734, -0.10204900056123734, -0.06824100017547607, -0.06824100017547607, -0.06824100017547607, 0.03044299967586994, 0.03044299967586994, 0.03044299967586994, 0.026799000799655914, 0.026799000799655914, 0.026799000799655914, -0.07169300317764282, -0.07169300317764282, -0.07169300317764282, -0.07498300075531006, -0.07498300075531006, -0.07498300075531006]
rotationDoubleArrayZ: [0.19162000715732574, 0.19162000715732574, 0.18857499957084656, 0.18857499957084656, 0.18857499957084656, 0.16563500463962555, 0.16563500463962555, 0.16563500463962555, 0.15753500163555145, 0.15753500163555145, 0.15753500163555145, 0.16617600619792938, 0.16617600619792938, 0.16617600619792938, 0.0989999994635582, 0.0989999994635582, 0.0989999994635582, 0.0755779966711998, 0.0755779966711998, 0.0755779966711998, -0.011357000097632408, -0.011357000097632408, -0.011357000097632408, -0.0029909999575465918, -0.0029909999575465918, -0.0029909999575465918, -0.039792999625205994, -0.039792999625205994, -0.039792999625205994, -0.05465399846434593, -0.05465399846434593, -0.05465399846434593]
rotationDoubleArrayCos: [0.9340260028839111, 0.9340260028839111, 0.9404839873313904, 0.9404839873313904, 0.9404839873313904, 0.94405597448349, 0.94405597448349, 0.94405597448349, 0.9232100248336792, 0.9232100248336792, 0.9232100248336792, 0.9582970142364502, 0.9582970142364502, 0.9582970142364502, 0.9611250162124634, 0.9611250162124634, 0.9611250162124634, 0.911083996295929, 0.911083996295929, 0.911083996295929, 0.9414939880371094, 0.9414939880371094, 0.9414939880371094, 0.9849100112915039, 0.9849100112915039, 0.9849100112915039, 0.9884790182113647, 0.9884790182113647, 0.9884790182113647, 0.9350330233573914, 0.9350330233573914, 0.9350330233573914]
rotationDoubleArrayAccuracy: [246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0, 246.0]
您能帮助我吗？这是因为每次接收到传感器事件时，您都会为所有3种事件类型填充数组，而不是只为一种事件类型（接收到事件的类型）填充数组 为了避免这种情况，您需要为每个事件类型保留三个单独的计数器 另外，据我所知，您希望在所有样本数组都被完全填充后将它们插入数据库。因此，您还需要修改插入DB的条件 因此，填充例程应修改如下：
if (samples_acc < samples_total || samples_gyro < samples_total || samples_rotation < samples_total)
{
if (flag == true)
{
//Get current date and time
currentTime = Calendar.getInstance().getTime();
dateTime = currentTime.toString();
//Add x,y,z values to arrays for sensors
if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER && samples_acc < samples_total)
{
accDoubleArrayX[samples_acc] = x;
accDoubleArrayY[samples_acc] = y;
accDoubleArrayZ[samples_acc] = z;
samples_acc++;
}
if (sensorEvent.sensor.getType() == Sensor.TYPE_GYROSCOPE && samples_gyro < samples_total)
{
gyroDoubleArrayX[samples_gyro] = x2;
gyroDoubleArrayY[samples_gyro] = y2;
gyroDoubleArrayZ[samples_gyro] = z2;
samples_gyro++;
}
if (sensorEvent.sensor.getType() == Sensor.TYPE_ROTATION_VECTOR && samples_rotation < samples_total)
{
rotationDoubleArrayX[samples_rotation] = x3;
rotationDoubleArrayY[samples_rotation] = y3;
rotationDoubleArrayZ[samples_rotation] = z3;
rotationDoubleArrayCos[samples_rotation] = cos3;
rotationDoubleArrayAccuracy[samples_rotation] = accuracy3;
samples_rotation++;
}
}//end if flag=true
else
{
//Log.d("", "samples < total but Flag is false - Data NOT inserted");
}
}//end if at least one of arrays is not filled yet
//all arrays have been filled
else
{
durationTime = System.currentTimeMillis() - startTime;
//Insert x,y,z values for sensors
dbRef.insertData(dateTime, accDoubleArrayX, accDoubleArrayY, accDoubleArrayZ,
gyroDoubleArrayX, gyroDoubleArrayY, gyroDoubleArrayZ,
rotationDoubleArrayX, rotationDoubleArrayY, rotationDoubleArrayZ, rotationDoubleArrayCos, rotationDoubleArrayAccuracy,
durationTime, label);
Log.d("", "Data inserted!");
Toast.makeText(this, "Data inserted!", Toast.LENGTH_LONG).show();
//Stop recording when given number of samples inserted
flag = false;
}
if（样本_acc<样本|总数|样本|陀螺<样本|总数|样本|旋转<样本|总数）
{
如果（标志==真）
{
//获取当前日期和时间
currentTime=Calendar.getInstance（）.getTime（）；
dateTime=currentTime.toString（）；
//将x、y、z值添加到传感器阵列
if（sensorEvent.sensor.getType（）==sensor.TYPE\u加速计和样本\u acc哦，还有一个关于按钮的附加说明：您最好将其移出您的
onSensorChangedif (samples_acc < samples_total || samples_gyro < samples_total || samples_rotation < samples_total)
{
if (flag == true)
{
//Get current date and time
currentTime = Calendar.getInstance().getTime();
dateTime = currentTime.toString();
//Add x,y,z values to arrays for sensors
if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER && samples_acc < samples_total)
{
accDoubleArrayX[samples_acc] = x;
accDoubleArrayY[samples_acc] = y;
accDoubleArrayZ[samples_acc] = z;
samples_acc++;
}
if (sensorEvent.sensor.getType() == Sensor.TYPE_GYROSCOPE && samples_gyro < samples_total)
{
gyroDoubleArrayX[samples_gyro] = x2;
gyroDoubleArrayY[samples_gyro] = y2;
gyroDoubleArrayZ[samples_gyro] = z2;
samples_gyro++;
}
if (sensorEvent.sensor.getType() == Sensor.TYPE_ROTATION_VECTOR && samples_rotation < samples_total)
{
rotationDoubleArrayX[samples_rotation] = x3;
rotationDoubleArrayY[samples_rotation] = y3;
rotationDoubleArrayZ[samples_rotation] = z3;
rotationDoubleArrayCos[samples_rotation] = cos3;
rotationDoubleArrayAccuracy[samples_rotation] = accuracy3;
samples_rotation++;
}
}//end if flag=true
else
{
//Log.d("", "samples < total but Flag is false - Data NOT inserted");
}
}//end if at least one of arrays is not filled yet
//all arrays have been filled
else
{
durationTime = System.currentTimeMillis() - startTime;
//Insert x,y,z values for sensors
dbRef.insertData(dateTime, accDoubleArrayX, accDoubleArrayY, accDoubleArrayZ,
gyroDoubleArrayX, gyroDoubleArrayY, gyroDoubleArrayZ,
rotationDoubleArrayX, rotationDoubleArrayY, rotationDoubleArrayZ, rotationDoubleArrayCos, rotationDoubleArrayAccuracy,
durationTime, label);
Log.d("", "Data inserted!");
Toast.makeText(this, "Data inserted!", Toast.LENGTH_LONG).show();
//Stop recording when given number of samples inserted
flag = false;
}