我想使用 Android 加速度传感器来测量距离。我修改了stackoverflow中的代码。街道信息很奇怪。你能告诉我怎么了吗？按下按钮时激活传感器，如果未按下按钮则计算传感器。我是韩国人，我使用谷歌翻译。
public class MainActivity extends AppCompatActivity {
SensorManager sm;
SensorEventListener acc;
Sensor accSensor;
TextView x,y,z,dist_total,time,dist_last,ax,az,ay;
float currentAcc, lastAcc=0.0f, effectiveAcc;
float distance = 0, totalDistance = 0;
long time_elapsed;
long tt;
long startTime;
long Endtime;
float xx;
float dX = 0;
public float accelXValue, accelYValue,accelZValue = 0.0f;
Button startButton,stopButton, resetButton;
Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sm = (SensorManager)getSystemService(SENSOR_SERVICE);
accSensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
acc = new accListener();
stopButton = (Button) findViewById(R.id.stop);
resetButton =(Button) findViewById(R.id.reset);
x = (TextView)findViewById(R.id.x);
y = (TextView)findViewById(R.id.y);
z = (TextView)findViewById(R.id.z);
ax = (TextView)findViewById(R.id.ax);
ay = (TextView)findViewById(R.id.ay);
az = (TextView)findViewById(R.id.az);
dist_last = (TextView)findViewById(R.id.text_last_dist);
time = (TextView)findViewById(R.id.text_time);
findViewById(R.id.start).setOnTouchListener(new View.OnTouchListener(){
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()){
case MotionEvent.ACTION_DOWN:
sm.registerListener(acc, accSensor, SensorManager.SENSOR_DELAY_UI);
displayValues();
startTime = System.currentTimeMillis();
break;
case MotionEvent.ACTION_UP:
sm.unregisterListener(acc);
calculate();
stopCalculation();
Endtime = System.currentTimeMillis();
System.out.println("**********Endtime**********"+(Endtime/1000));
break;
}
return false;
}
});
stopButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
resetButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
resetFields();
Toast.makeText(getApplicationContext(),"모든 정보를 초기화를 했습니다.",Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onPause(){
super.onPause();
Log.e("LOG", "onPause()");
sm.unregisterListener(acc);
}
@Override
public void onDestroy(){
super.onDestroy();
Log.e("LOG", "onDestroy()");
sm.unregisterListener(acc);
}
@Override
protected void onResume() {
super.onResume();
sm.registerListener(acc,accSensor,SensorManager.SENSOR_DELAY_GAME);
}
private class accListener implements SensorEventListener {
public void onSensorChanged(SensorEvent event){
x.setText(Float.toString(event.values[0]));
y.setText(Float.toString(event.values[1]));
z.setText(Float.toString(event.values[2]));
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
accelXValue = event.values[0];
accelYValue = event.values[1];
accelZValue = event.values[2];
Log.e("LOG", "ACCELOMETER [X]:" + String.format("%.4f", event.values[0])
+ " [Y]:" + String.format("%.4f", event.values[1])
+ " [Z]:" + String.format("%.4f", event.values[2]));
}
public void onAccuracyChanged(Sensor sensor,int accuracy){
}
}
public void calculate() {
time_elapsed = (Endtime-startTime)/1000;
tt = Math.abs(time_elapsed);
currentAcc = (float) Math.sqrt(Math.pow(accelXValue,2)+Math.pow(accelZValue,2)+Math.pow(accelYValue,2));
effectiveAcc = currentAcc - lastAcc;
distance = Math.abs(effectiveAcc) * 0.5f * tt * tt ;
totalDistance += distance;
lastAcc = currentAcc;
System.out.println("totalDistance : "+totalDistance);
System.out.println("tt : "+tt);
System.out.println("currentAcc : " +currentAcc);
System.out.println("effectiveAcc : "+effectiveAcc);
System.out.println("distance : "+distance);
System.out.println("lastAcc : "+lastAcc);
}
private void stopCalculation() {
dist_last.setText(String.format("Distance: " + "%s" + " m",
Float.toString(distance)));
}
public void displayValues(){
ax.setText(String.format("Acceleration X: " + "%s" , accelXValue));
ay.setText(String.format("Acceleration Y: " + "%s" , accelYValue));
az.setText(String.format("Acceleration Z: " + "%s" , accelZValue));
}
public void resetFields(){
totalDistance = 0.0f;
distance = 0.0f;
tt =0;
currentAcc = 0.0f;
lastAcc = 0.0f;
effectiveAcc =0.0f;
dist_last.setText(String.format("Distance: " + "%s" + " m",Float.toString(distance)));
System.out.println("TotalDistance"+totalDistance);
System.out.println("distance"+distance);
System.out.println("tt"+tt);
System.out.println("currentAcc"+currentAcc);
System.out.println("effectiveAcc"+effectiveAcc);
System.out.println("lastAcc"+lastAcc);
}
最佳答案
无论您做什么，这都不会很好地工作。加速度计有两个问题:
1) 很吵。这意味着你会有很多小错误，这些错误会很快累积起来
2)它可以最大化。如果你加速太猛，它会达到上限并且不会报告任何更高的东西。
如果您想计算距离，最好使用 GPS 和平滑算法。加速度计总是会给出糟糕的结果。
关于android - 使用 Android 加速度传感器进行距离测量，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52068688/