Modified Snake Sample app to run on non-touch devices like Google Tv and also devices with no dpad support

2D canvas DrawVertex to create a vector graphic background
touch & keypad playable
landscape & portrait for all known device sizes.  All measurements in DP and nicely scaling.
using xml drawables to rotate "dpad" arrow

Change-Id: I995acaaf0935c13c03fcbcf974ce5af06f46780e

samples/Snake/src/com/example/android/snake/Snake.java

@@ -18,27 +18,38 @@ package com.example.android.snake;
 
 import android.app.Activity;
 import android.os.Bundle;
-import android.view.Window;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnTouchListener;
 import android.widget.TextView;
 
 /**
  * Snake: a simple game that everyone can enjoy.
  * 
- * This is an implementation of the classic Game "Snake", in which you control a
- * serpent roaming around the garden looking for apples. Be careful, though,
- * because when you catch one, not only will you become longer, but you'll move
- * faster. Running into yourself or the walls will end the game.
+ * This is an implementation of the classic Game "Snake", in which you control a serpent roaming
+ * around the garden looking for apples. Be careful, though, because when you catch one, not only
+ * will you become longer, but you'll move faster. Running into yourself or the walls will end the
+ * game.
  * 
  */
 public class Snake extends Activity {
 
-    private SnakeView mSnakeView;
-    
+    /**
+     * Constants for desired direction of moving the snake
+     */
+    public static int MOVE_LEFT = 0;
+    public static int MOVE_UP = 1;
+    public static int MOVE_DOWN = 2;
+    public static int MOVE_RIGHT = 3;
+
     private static String ICICLE_KEY = "snake-view";
 
+    private SnakeView mSnakeView;
+
     /**
-     * Called when Activity is first created. Turns off the title bar, sets up
-     * the content views, and fires up the SnakeView.
+     * Called when Activity is first created. Turns off the title bar, sets up the content views,
+     * and fires up the SnakeView.
      * 
      */
     @Override
@@ -48,7 +59,8 @@ public class Snake extends Activity {
         setContentView(R.layout.snake_layout);
 
         mSnakeView = (SnakeView) findViewById(R.id.snake);
-        mSnakeView.setTextView((TextView) findViewById(R.id.text));
+        mSnakeView.setDependentViews((TextView) findViewById(R.id.text),
+                findViewById(R.id.arrowContainer), findViewById(R.id.background));
 
         if (savedInstanceState == null) {
             // We were just launched -- set up a new game
@@ -62,6 +74,31 @@ public class Snake extends Activity {
                 mSnakeView.setMode(SnakeView.PAUSE);
             }
         }
+        mSnakeView.setOnTouchListener(new OnTouchListener() {
+
+            @Override
+            public boolean onTouch(View v, MotionEvent event) {
+                if (mSnakeView.getGameState() == SnakeView.RUNNING) {
+                    // Normalize x,y between 0 and 1
+                    float x = event.getX() / v.getWidth();
+                    float y = event.getY() / v.getHeight();
+
+                    // Direction will be [0,1,2,3] depending on quadrant
+                    int direction = 0;
+                    direction = (x > y) ? 1 : 0;
+                    direction |= (x > 1 - y) ? 2 : 0;
+
+                    // Direction is same as the quadrant which was clicked
+                    mSnakeView.moveSnake(direction);
+
+                } else {
+                    // If the game is not running then on touching any part of the screen
+                    // we start the game by sending MOVE_UP signal to SnakeView
+                    mSnakeView.moveSnake(MOVE_UP);
+                }
+                return false;
+            }
+        });
     }
 
     @Override
@@ -73,8 +110,34 @@ public class Snake extends Activity {
 
     @Override
     public void onSaveInstanceState(Bundle outState) {
-        //Store the game state
+        // Store the game state
         outState.putBundle(ICICLE_KEY, mSnakeView.saveState());
     }
 
+    /**
+     * Handles key events in the game. Update the direction our snake is traveling based on the
+     * DPAD.
+     *
+     */
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent msg) {
+
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_DPAD_UP:
+                mSnakeView.moveSnake(MOVE_UP);
+                break;
+            case KeyEvent.KEYCODE_DPAD_RIGHT:
+                mSnakeView.moveSnake(MOVE_RIGHT);
+                break;
+            case KeyEvent.KEYCODE_DPAD_DOWN:
+                mSnakeView.moveSnake(MOVE_DOWN);
+                break;
+            case KeyEvent.KEYCODE_DPAD_LEFT:
+                mSnakeView.moveSnake(MOVE_LEFT);
+                break;
+        }
+
+        return super.onKeyDown(keyCode, msg);
+    }
+
 }