出现在地图上的折线，他们不应该折线、在地、图上

2023-09-06 00:04:17 作者：烂好人

我有大约7000位置的阵列，每一个被使用在Android上的位置管理器，加载这些地方，当我过滤掉任何记录我们其它则1公里处previous或使用具有精度高于50这样的：

I have a array of about 7000 locations, each one was recorded using the location manager on android, when loading these locations I filter out any that are further then 1km from the previous or have an accuracy higher then 50 using this:

if (c.moveToFirst())
do {
    lat = c.getString(0);
    lng = c.getString(1);
    ac = c.getString(2);
    alt = c.getString(3);
    if (l1 != null) {
        l2 = new Location("MAP");
        l2.setLatitude(Double.parseDouble(lat));
        l2.setLongitude(Double.parseDouble(lng));
        l2.setAltitude(Double.parseDouble(alt));
        l2.setAccuracy(Float.parseFloat(ac));
        if (l1.distanceTo(l2) < 1000
                && l2.getAccuracy() < 51) {
            opts.add(new LatLng(Double.parseDouble(lat),
                    Double.parseDouble(lng)));
            list.add(l2);
            l1 = l2;
        }
    } else {
        l1 = new Location("MAP");
        l1.setLatitude(Double.parseDouble(lat));
        l1.setLongitude(Double.parseDouble(lng));
        l1.setAccuracy(Float.parseFloat(ac));
        l1.setAltitude(Double.parseDouble(alt));
        if (l1.getAccuracy() > 50)
            l1 = null;
    }

} while (c.moveToNext());

因此，消除这些随机行准备承担它的工作，因为它应该。

So that removes the possibilities for these random lines assuming its working as it should.

当它正常工作，应该拿出这样的：

When it is working correctly it should come up like this:

然而，当我放大一点或走动，有时我得到这些随机行：

However, when I zoom in a little more or move around sometimes I get these random lines:

林添加行是这样的：

Location[] locations = Arrays.copyOfRange(mLocations, a, b);

if (mStartLine != null)
    mStartLine.remove();
if (mMiddleLine != null)
    mMiddleLine.remove();
if (mEndLine != null)
    mEndLine.remove();
if (mMarker != null) {
    mMarker.remove();
    mMarker = null;
}
PolylineOptions so = new PolylineOptions();
PolylineOptions mo = new PolylineOptions();
PolylineOptions eo = new PolylineOptions();

so.color(Color.GREEN);
eo.color(Color.GREEN);
mo.color(Color.BLACK);

if (locations.length < 2) {
    if (locations.length == 0)
        return;
    // Add just a dot instead.
    MarkerOptions m = new MarkerOptions();
    m.position(new LatLng(locations[0].getLatitude(), locations[0]
            .getLongitude()));
    mMarker = mMap.addMarker(m);
    return;
}
so.add(new LatLng(locations[0].getLatitude(), locations[0].getLongitude()));
so.add(new LatLng(locations[1].getLatitude(), locations[1].getLongitude()));
mStartLine = mMap.addPolyline(so);
for(int i = 1; i < (locations.length - 1); i++){
    mo.add(new LatLng(locations[i].getLatitude(), locations[i].getLongitude()));
}
mMiddleLine = mMap.addPolyline(mo);
eo.add(new LatLng(locations[locations.length - 2].getLatitude(), locations[locations.length - 2].getLongitude()));
eo.add(new LatLng(locations[locations.length - 1].getLatitude(), locations[locations.length - 1].getLongitude()));
mEndLine = mMap.addPolyline(eo);

在底部的酒吧是一个选择器只显示位置跨度（因为当你有像7000位置显示那么它得到pretty的疯狂，你会得到的StackOverflowError 的）

出现在地图上的折线，他们不应该折线、在地、图上

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