我正在开发一个Android应用，该应用会将传感器数据记录到SQLite数据库中。
过程如下：
当我在每个双精度数组中都有相乘的值时，我遇到了一个问题。
下面是代码片段：
@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
}
}
还有insertData方法：
//Inserting data
public boolean insertData(String start_time,
double[] acc_x, double[] acc_y, double[] acc_z,
double[] gyro_x, double[] gyro_y, double[] gyro_z,
double[] rotation_x, double[] rotation_y, double[] rotation_z, double[] rotation_cos, double[] rotation_accuracy,
long duration_time, String label) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_REC_TIME, start_time);
contentValues.put(COL_ACC_X, Arrays.toString(acc_x));
contentValues.put(COL_ACC_Y, Arrays.toString(acc_y));
contentValues.put(COL_ACC_Z, Arrays.toString(acc_z));
contentValues.put(COL_GYRO_X, Arrays.toString(gyro_x));
contentValues.put(COL_GYRO_Y, Arrays.toString(gyro_y));
contentValues.put(COL_GYRO_Z, Arrays.toString(gyro_z));
contentValues.put(COL_ROTATION_X, Arrays.toString(rotation_x));
contentValues.put(COL_ROTATION_Y, Arrays.toString(rotation_y));
contentValues.put(COL_ROTATION_Z, Arrays.toString(rotation_z));
contentValues.put(COL_ROTATION_COS, Arrays.toString(rotation_cos));
contentValues.put(COL_ROTATION_ACCURACY, Arrays.toString(rotation_accuracy));
contentValues.put(COL_DURATION, String.valueOf(duration_time));
contentValues.put(COL_LABEL, label);
long result = db.insert(TABLE_NAME, null, contentValues);
if (result == -1)
return false;
else
return true;
}
此代码几乎可以按预期工作，但为我提供了倍增的值。数组中的值看起来像这样：
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]
如您所见，加速度计的前三个值相同，接下来的三个相同，依此类推。 对于陀螺仪：第一个值是唯一的，然后三个是相同的，接下来的三个是相同的，依此类推。 对于旋转矢量：前两个相同，然后下三个相同，然后下三个，依此类推。
对我来说，这真的很奇怪，我找不到解决此问题的方法。
你能帮我吗？
答案 0 :(得分：0)
之所以发生这种情况，是因为每次接收到传感器事件时，您都填充所有3种事件类型的数组，而不是仅填充一种事件类型（已接收事件的类型）的数组。
为了避免这种情况，您需要为每种事件类型保留三个单独的计数器。
据我所知，您还想在所有示例数组都已完全填充后将其插入到DB中。因此，您还需要修改数据库插入条件。
因此，应按以下方式修改填充例程：
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;
}
哦，还有关于按钮的另一条注释：最好将其从onSensorChanged方法中移出，因为在每次收到新事件时都不必重新声明它