You can put tiles into assets folder (if it is acceptable for the app size) or download them all on first start and put them into device storage (SD card).
You can implement TileProvider like this:
public class CustomMapTileProvider implements TileProvider {
private static final int TILE_WIDTH = 256;
private static final int TILE_HEIGHT = 256;
private static final int BUFFER_SIZE = 16 * 1024;
private AssetManager mAssets;
public CustomMapTileProvider(AssetManager assets) {
mAssets = assets;
}
@Override
public Tile getTile(int x, int y, int zoom) {
byte[] image = readTileImage(x, y, zoom);
return image == null ? null : new Tile(TILE_WIDTH, TILE_HEIGHT, image);
}
private byte[] readTileImage(int x, int y, int zoom) {
InputStream in = null;
ByteArrayOutputStream buffer = null;
try {
in = mAssets.open(getTileFilename(x, y, zoom));
buffer = new ByteArrayOutputStream();
int nRead;
byte[] data = new byte[BUFFER_SIZE];
while ((nRead = in.read(data, 0, BUFFER_SIZE)) != -1) {
buffer.write(data, 0, nRead);
}
buffer.flush();
return buffer.toByteArray();
} catch (IOException e) {
e.printStackTrace();
return null;
} catch (OutOfMemoryError e) {
e.printStackTrace();
return null;
} finally {
if (in != null) try { in.close(); } catch (Exception ignored) {}
if (buffer != null) try { buffer.close(); } catch (Exception ignored) {}
}
}
private String getTileFilename(int x, int y, int zoom) {
return "map/" + zoom + '/' + x + '/' + y + ".png";
}
}
And now you can use it with your GoogleMap instance:
private void setUpMap() {
mMap.setMapType(GoogleMap.MAP_TYPE_NONE);
mMap.addTileOverlay(new TileOverlayOptions().tileProvider(new CustomMapTileProvider(getResources().getAssets())));
CameraUpdate upd = CameraUpdateFactory.newLatLngZoom(new LatLng(LAT, LON), ZOOM);
mMap.moveCamera(upd);
}
In my case I also had a problem with y coordinate of tiles generated by MapTiler, but I managed it by adding this method into CustomMapTileProvider:
/**
* Fixing tile's y index (reversing order)
*/
private int fixYCoordinate(int y, int zoom) {
int size = 1 << zoom; // size = 2^zoom
return size - 1 - y;
}
and callig it from getTile() method like this:
@Override
public Tile getTile(int x, int y, int zoom) {
y = fixYCoordinate(y, zoom);
...
}
[Upd]
If you know exac area of your custom map, you should return NO_TILE for missing tiles from getTile(...) method.
This is how I did it:
private static final SparseArray TILE_ZOOMS = new SparseArray() {{
put(8, new Rect(135, 180, 135, 181 ));
put(9, new Rect(270, 361, 271, 363 ));
put(10, new Rect(541, 723, 543, 726 ));
put(11, new Rect(1082, 1447, 1086, 1452));
put(12, new Rect(2165, 2894, 2172, 2905));
put(13, new Rect(4330, 5789, 4345, 5810));
put(14, new Rect(8661, 11578, 8691, 11621));
}};
@Override
public Tile getTile(int x, int y, int zoom) {
y = fixYCoordinate(y, zoom);
if (hasTile(x, y, zoom)) {
byte[] image = readTileImage(x, y, zoom);
return image == null ? null : new Tile(TILE_WIDTH, TILE_HEIGHT, image);
} else {
return NO_TILE;
}
}
private boolean hasTile(int x, int y, int zoom) {
Rect b = TILE_ZOOMS.get(zoom);
return b == null ? false : (b.left <= x && x <= b.right && b.top <= y && y <= b.bottom);
}
. The phone is stuck in recovery mode and I am unable to make a selection in recovery. How can I flash the correct version of stock recovery. i cant factory reset in my phone. plz give a solution ......