android wgs84转gcj02

要将WGS84坐标转换为GCJ02坐标，可以使用以下代码实现：

public static double[] wgs84ToGcj02(double lat, double lon) {
    double pi = 3.1415926535897932384626;
    double a = 6378245.0;
    double ee = 0.00669342162296594323;
    double[] loc = new double[2];
    if (outOfChina(lat, lon)) {
        loc[0] = lat;
        loc[1] = lon;
        return loc;
    } else {
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        loc[0] = lat + dLat;
        loc[1] = lon + dLon;
        return loc;
    }
}

private static boolean outOfChina(double lat, double lon) {
    if (lon < 72.004 || lon > 137.8347)
        return true;
    if (lat < 0.8293 || lat > 55.8271)
        return true;
    return false;
}

private static double transformLat(double x, double y) {
    double pi = 3.1415926535897932384626;
    double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
    ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
    ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
    ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
    return ret;
}

private static double transformLon(double x, double y) {
    double pi = 3.1415926535897932384626;
    double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
    ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
    ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
    ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
    return ret;
}

其中，传入的参数`lat`和`lon`分别表示待转换坐标的纬度和经度。返回的`loc`数组中，`loc[0]`表示转换后的纬度，`loc[1]`表示转换后的经度。