地图数据
image.png
image.png
public static String bundlesDirIMG= SDCardUtils.getSDCardPathByEnvironment() + Constants.MAP_BUNDLES_DARK;
public static byte[] mapIMG(int level, int row, int col) throws IOException {
byte[] result = {};
String l = "0" + level;
int lLength = l.length();
if (lLength > 2) {
l = l.substring(lLength - 2);
}
l = "L" + l;
//r补0
int rGroup = 128 * (row / 128);
String rName = Integer.toHexString(rGroup);
StringBuilder rbu0 = new StringBuilder();
if (rName.length() < 4) {
int i = 4 - rName.length();
for (int i1 = 0; i1 < i; i1++) {
rbu0.append("0");
}
}
rbu0.append(rName);
rbu0.insert(0, "R");
//c补0
int cGroup = 128 * (col / 128);
String cName = Integer.toHexString(cGroup);
StringBuilder cbu0 = new StringBuilder();
if (cName.length() < 4) {
int i = 4 - cName.length();
for (int i1 = 0; i1 < i; i1++) {
cbu0.append("0");
}
}
cbu0.append(cName);
cbu0.insert(0, "C");
String bundleBase = String.format("%s/%s/%s%s", bundlesDirIMG, l, rbu0.toString(), cbu0.toString());
String bundlxFileName = bundleBase + ".bundlx";
// LogUtils.e("bundlxFileName" + bundlxFileName);
String bundleFileName = bundleBase + ".bundle";
// LogUtils.e("bundleFileName" + bundleFileName);
int index = 128 * (col - cGroup) + (row - rGroup);
FileInputStream isBundlx = new FileInputStream(bundlxFileName);
isBundlx.skip(16 + 5 * index);
byte[] buffer = new byte[5];
isBundlx.read(buffer);
long offset = (long) (buffer[0] & 0xff) + (long) (buffer[1] & 0xff)
* 256 + (long) (buffer[2] & 0xff) * 65536
+ (long) (buffer[3] & 0xff) * 16777216
+ (long) (buffer[4] & 0xff) * 4294967296L;
FileInputStream isBundle = new FileInputStream(bundleFileName);
isBundle.skip(offset);
byte[] lengthBytes = new byte[4];
isBundle.read(lengthBytes);
int length = (int) (lengthBytes[0] & 0xff)
+ (int) (lengthBytes[1] & 0xff) * 256
+ (int) (lengthBytes[2] & 0xff) * 65536
+ (int) (lengthBytes[3] & 0xff) * 16777216;
result = new byte[length];
int read = isBundle.read(result);
return result;
}
image.png
