Question

我需要计算用户移动的速度。所以我们需要两件事来计算速度，即GPS和加速度计。

但两者都有其局限性。

GPS一直无法使用。虽然我得到了当前的信息用户的位置总是我从网络提供商那里得到的不是来自GPS。
加速度计不准确。

我应该采用哪种方法？

Answer 1

加速度计不可靠，现在您可以尝试测试和调整内容以满足您的要求。

点击此处：

https://github.com/bagilevi/android-pedometer

众多功能之一：

根据用户的步长计算距离和速度

Answer 2

请尝试以下使用 GPS 获取移动速度的方法

public class MainActivity extends AppCompatActivity {

    TextView textView;
    private FusedLocationProviderClient mFusedLocationClient;
    private double lat;
    private double lng;
    private static int UPDATE_INTERVAL = 1000;
    private static int FATEST_INTERVAL = 1000;
    private static int DISPLACEMENT = 0;
    private double speed = 0.0;
    double currentSpeed,kmphSpeed;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        textView = findViewById(R.id.textView);
        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (!runtime_permissions()) {
            requestLocations();
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        //stop location updates when Activity is no longer active
        if (mFusedLocationClient != null) {
            mFusedLocationClient.removeLocationUpdates(mLocationCallback);
        }
    }

    @SuppressLint("MissingPermission")
    private void requestLocations() {
        LocationRequest mLocationRequest = new LocationRequest();
//        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        mLocationRequest.setInterval(UPDATE_INTERVAL);
        mLocationRequest.setFastestInterval(FATEST_INTERVAL);
        mLocationRequest.setSmallestDisplacement(DISPLACEMENT);

        mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
    }

    LocationCallback mLocationCallback = new LocationCallback() {
        @Override
        public void onLocationResult(LocationResult locationResult) {
            List<Location> locationList = locationResult.getLocations();
            if (locationList.size() > 0) {
                //The last location in the list is the newest
                Location location = locationList.get(locationList.size() - 1);
                Location location2 = locationResult.getLastLocation();
                lat = location.getLatitude();
                lng = location.getLongitude();

                speed = location.getSpeed();
                currentSpeed = round(speed,3,BigDecimal.ROUND_HALF_UP);
                kmphSpeed = round((currentSpeed*3.6),3,BigDecimal.ROUND_HALF_UP);

                //speed in km/h
//                speed = (int) ((location.getSpeed() * 3600) / 1000);
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        textView.setText("speed=== "+speed+"\ncurrentspeed==="+currentSpeed+"\nkmph speed === "+kmphSpeed);
                    }
                });
//                Log.i("SensorTestActivity","SPEEDDDDDspeed=== "+speed+"     ");
            }
        }
    };

    public static double round(double unrounded, int precision, int roundingMode) {
        BigDecimal bd = new BigDecimal(unrounded);
        BigDecimal rounded = bd.setScale(precision, roundingMode);
        return rounded.doubleValue();
    }

    private boolean runtime_permissions() {
        if (Build.VERSION.SDK_INT >= 23 && ContextCompat.checkSelfPermission(this,
                Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

            requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 100);

            return true;
        }
        return false;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 100) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                onResume();
            } else {
                runtime_permissions();
            }
        }
    }
}

在android studio中计算USER的移动速度

2 个答案: