Question

我正在测试具有不同优先级的FusedLocationProviderClient位置更新的准确性。在应用程序中，我首先使用PRIORITY_HIGH_ACCURACY获得15次更新，然后取消请求，将优先级更改为PRIORTIY_LOW_POWER并再次请求。我也尝试更改为ACCURACY_BALANCED_POWER_ACCURACY，在这两种情况下，PRIORITY_HIGH_ACCURACY在准确性方面表现最差 - 每次运行我的应用时都会这样做。

我注意到的另一件事是，在前15次更新中，准确性经常发生变化，而最后15次更新几乎同样具有相同的准确性。知道为什么会这样吗？这是我的代码：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    txtBatteryLevel = (TextView) findViewById(R.id.batteryLevel);
    txtAccuracy = (TextView) findViewById(R.id.accuracy);

    mFusedLocationClient = 
    LocationServices.getFusedLocationProviderClient(this);

    mLocationRequest = new LocationRequest();
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    mLocationRequest.setInterval(0);

    mLocationCallback = new LocationCallback() {
        @Override
        public void onLocationResult(LocationResult locationResult){
            onLocationChanged(locationResult.getLastLocation());
        }
    };


    requestLocationUpdates();
}

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

public void onLocationChanged(Location location){
    int batteryLevel = Integer.valueOf(txtBatteryLevel.getText().toString());
    if(batteryLevel>0) {
        if (mLocationRequest.getPriority() == LocationRequest.PRIORITY_HIGH_ACCURACY) {
            if (batteryLevel <= 15) { 
           mFusedLocationClient.removeLocationUpdates(mLocationCallback);
           mLocationRequest = new LocationRequest();
           mLocationRequest.setPriority(LocationRequest.PRIORITY_LOW_POWER);
           mLocationRequest.setInterval(0);

           requestLocationUpdates();
           return;
            }
        }
        txtAccuracy.setText(String.valueOf(location.getAccuracy()));

        batteryLevel--;
        txtBatteryLevel.setText(String.valueOf(batteryLevel));
    }
}

Answer 1

检查以下代码是否对您有帮助...

locationCallback = new LocationCallback() {
                @Override
                public void onLocationResult(LocationResult locationResult) {
                    super.onLocationResult(locationResult);
                    for (Location location : locationResult.getLocations()) {
                        if (location != null) {
                            mLastKnownLocation = location;
                        }
                    }
                }
            };

FusedLocationProviderClient PRIORITY_HIGH_ACCURACY的表现比其他优先级差

1 个答案: