Collisions with tilemaps help

I am trying to make collisions on my map, i have a collisions layer and a layer for viewing but i dont really know how to do it, any help would be much appreciated.
(sorry for my messy code im still fairly new to java)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241

package JavaGame;
import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
import org.newdawn.slick.tiled.TiledMap;

public class Play extends BasicGameState{

   Animation player, movingUp, movingDown, movingLeft, movingRight, water;
   boolean quit = false;
   float playerX = 0;
   float playerY = 0;
   float shiftX = playerX + 428;
   float shiftY = playerY + 200;
   private TiledMap map/*, map2, map3*/;
   private boolean[][] blocked;
   private static final int SIZE = 16;


   public Play(int state){
   }

   public void init(GameContainer gc, StateBasedGame sbg) throws SlickException{   
      map = new TiledMap(/*"res/Grass16x.tmx"*/"res/East10.tmx");
      //map2 = new TiledMap("res/Map.tmx");
      //map3 = new TiledMap("res/Area1.tmx");
      //worldGrass = new Image("res/GB.png");
      SpriteSheet sheet = new SpriteSheet("res/char.png",10,13);
      SpriteSheet waves = new SpriteSheet("res/wateranimation.png",16,16);

      water = new Animation(waves, 0, 0, 3, 0, true, 500, true);
      movingUp = new Animation(sheet, 8, 0, 11, 0, true, 100, false);
      movingDown = new Animation(sheet, 0, 0, 3, 0, true, 100, false);
      movingLeft = new Animation(sheet, 4, 0, 7, 0, true, 100, false);
      movingRight = new Animation(sheet, 12, 0, 15, 0, true, 100, false);
      player = movingDown;
      
      /*blocked = new boolean[map.getWidth()][map.getHeight()];
      for (int x=0;x<map.getWidth();x++) {
         for (int y=0;y<map.getHeight();y++) {
            int tileID = map.getTileId(x, y, 0);
            String value = map.getTileProperty(tileID, "blocked", "false");
            if ("true".equals(value)) {
               blocked[x][y] = true;
            }
         }
      }*/

        blocked = new boolean[map.getWidth()][map.getHeight()];
      for (int xAxis=0;xAxis<map.getWidth(); xAxis++)
        {
             for (int yAxis=0;yAxis<map.getHeight(); yAxis++)
             {
                 int tileID = map.getTileId(xAxis, yAxis, 0);
                 String value = map.getTileProperty(tileID, "blocked", "false");
                 if ("true".equals(value))
                 {
                     blocked[xAxis][yAxis] = true;
                 }
             }
         }
   }

   public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws SlickException{
      g.translate(shiftX,shiftY); 
      g.scale(2f, 2f);  
      g.translate(-shiftX, -shiftY); 
      
      map.render((int)playerX, (int)playerY);
      //map2.render((int)playerX + 864, (int)playerY);
      //map3.render((int)playerX + 864, (int)playerY - 480);
      /*water.draw(playerX, playerY);
      water.draw(playerX+16, playerY);
      water.draw(playerX, playerY+16);
      water.draw(playerX+16, playerY+16);*/
      player.draw(428, 200);
      g.drawString("Players X: "+ playerX+"\nPlayers Y: " + playerY, 0, 20);

      

      if(quit == true){
         g.drawString("Resume (R)", 250, 100);
         g.drawString("Main Menu (M)", 250, 150);
         g.drawString("Quit Game (Q)", 250, 200);
         if(quit==false){
            g.clear();
         }
      }
   }

   public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException{
      Input input = gc.getInput();
      
      /*if(input.isKeyDown(Input.KEY_W)){
         player = movingUp;
         movingUp.update(delta);


         playerY += delta *1f;

         if(playerX <-421){
            if(playerY>705){
            playerY -= delta *1f;
            }
         } else if(playerY>220){
            playerY -= delta *1f;
            
         }
      }

      if(input.isKeyDown(Input.KEY_S)){
         player = movingDown;
         movingDown.update(delta);


         playerY -= delta *1f;

         if(playerY<-245){
            playerY += delta *1f;
         }
      }

      if(input.isKeyDown(Input.KEY_A)){
         player = movingLeft;
         movingLeft.update(delta);


         playerX += delta *1f;

         if(playerX>430){
            playerX -= delta *1f;
         }
      }

      if(input.isKeyDown(Input.KEY_D)){
         player = movingRight;
         movingRight.update(delta);


         playerX -= delta *1f;

         if(playerX<-1070){
            playerX += delta *1f;
            //sbg.enterState(2);
         }
      }


      if(input.isKeyDown(Input.KEY_ESCAPE)){
         quit = true;
      }


      if(quit == true){
         if(input.isKeyDown(Input.KEY_R)){
            quit = false;
         }
         if(input.isKeyDown(Input.KEY_M)){
            sbg.enterState(0);
         }
         if(input.isKeyDown(Input.KEY_Q)){
            System.exit(0);
         }
      }*/
      
      if (input.isKeyDown(Input.KEY_W))
        {
            player = movingUp;
            if (!isBlocked(playerX, playerY - delta * 0.1f))
            {
                movingUp.update(delta);
                // The lower the delta the slowest the sprite will animate.
                playerY += delta * 0.1f;
            }
        }
        else if (input.isKeyDown(Input.KEY_S))
        {
            player = movingDown;
            if (!isBlocked(playerX, playerY + SIZE + delta * 0.1f))
            {
                movingDown.update(delta);
                playerY -= delta * 0.1f;
            }
        }
        else if (input.isKeyDown(Input.KEY_A))
        {
            player = movingLeft;
            if (!isBlocked(playerX - delta * 0.1f, playerY))
            {
                movingLeft.update(delta);
                playerX += delta * 0.1f;
            }
        }
        else if (input.isKeyDown(Input.KEY_D))
        {
            player = movingRight;
            if (!isBlocked(playerX + SIZE + delta * 0.1f, playerY))
            {
                movingRight.update(delta);
                playerX -= delta * 0.1f;
            }
        }
   }
   
   private boolean isBlocked(float x, float y)
    {
        int xBlock = (int)x / SIZE;
        int yBlock = (int)y / SIZE;
        return blocked[xBlock][yBlock];
    }
   
   /*private boolean tryMove(float x, float y) {
      float newx = playerX + x;
      float newy = playerY + y;
      
      // first we try the real move, if that doesn't work
      // we try moving on just one of the axis (X and then Y) 
      // this allows us to slide against edges
      if (blocked(newx,newy)) {
         if (blocked(newx, playerY)) {
            if (blocked(playerX, newy)) {
               // can't move at all!
               return false;
            } else {
               playerY = newy;
               return true;
            }
         } else {
            playerX = newx;
            return true;
         }
      } else {
         playerX = newx;
         playerY = newy;
         return true;
      }
   }*/

   public int getID(){
      return 1;
   }
}

This is the error code i get:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

Sun Jul 29 17:17:59 BST 2012 INFO:Slick Build #274
Sun Jul 29 17:18:00 BST 2012 INFO:LWJGL Version: 2.8.4
Sun Jul 29 17:18:00 BST 2012 INFO:OriginalDisplayMode: 1366 x 768 x 32 @60Hz
Sun Jul 29 17:18:00 BST 2012 INFO:TargetDisplayMode: 855 x 480 x 0 @0Hz
Sun Jul 29 17:18:00 BST 2012 INFO:Starting display 855x480
Sun Jul 29 17:18:00 BST 2012 INFO:Use Java PNG Loader = true
Sun Jul 29 17:18:00 BST 2012 INFO:Controllers not available
Sun Jul 29 17:18:07 BST 2012 ERROR:-1
java.lang.ArrayIndexOutOfBoundsException: -1
   at JavaGame.Play.isBlocked(Play.java:208)
   at JavaGame.Play.update(Play.java:178)
   at org.newdawn.slick.state.StateBasedGame.update(StateBasedGame.java:268)
   at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:657)
   at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:408)
   at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:318)
   at JavaGame.Game.main(Game.java:29)
Sun Jul 29 17:18:07 BST 2012 ERROR:Game.update() failure - check the game code.
org.newdawn.slick.SlickException: Game.update() failure - check the game code.
   at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:663)
   at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:408)
   at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:318)
   at JavaGame.Game.main(Game.java:29)