/**
 * Touch Input Demo
 */
package android.program; 

import android.app.Activity;
import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.*;
import android.os.Bundle;
import android.view.*;
import android.view.View.OnTouchListener;

public class Game extends Activity implements OnTouchListener {
    DrawView drawView;

    //input variables
    Point touch = new Point(0,0);
    String inputAction = "";


    @Override public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        drawView = new DrawView(this);
        setContentView(drawView);
        
        //turn on touch listening
        drawView.setOnTouchListener(this);
    }

    @Override public void onResume() {
        super.onResume();
        drawView.resume();
    }

    @Override public void onPause() {
        super.onPause();
        drawView.pause();
    }
    
    //touch listener event
    @Override public boolean onTouch(View v, MotionEvent event) {
        switch(event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                inputAction = "DOWN";
                break;
            case MotionEvent.ACTION_MOVE:
                inputAction = "MOVE";
                break;
            case MotionEvent.ACTION_UP:
                inputAction = "UP";
                break;
        }
        
        //remember this touch position
        touch.x = (int)event.getX();
        touch.y = (int)event.getY();
        
        //notify touch handler that we used it
        return true;
    }

    public class DrawView extends SurfaceView implements Runnable 
    {
        //game loop thread
        Thread gameloop = null; 

        //surface holder
        SurfaceHolder surface = null; 

        //thread-safe running var
        volatile boolean running = false; 

        //asset manager
        AssetManager assets = null; 
        
        //constructor method
        public DrawView(Context context) {
            super(context);

            //get the SurfaceHolder object 
            surface = getHolder();

            //create the asset manager
            assets = context.getAssets();

        }

        public void resume() {
            running = true;
            gameloop = new Thread(this);
            gameloop.start();
        }

        public void pause() {
            running = false;
            while (true) {
                try { 
                    gameloop.join();
                } 
                catch (InterruptedException e) { }
            }
        }

        //thread run method
        @Override public void run() {

            while (running) {
                if (!surface.getSurface().isValid()) continue;

                //open the canvas for drawing
                Canvas canvas = surface.lockCanvas();
                canvas.drawColor(Color.BLACK);

                //draw circle at touch position
                Paint paint = new Paint();
                paint.setColor(Color.WHITE);
                paint.setTextSize(24);
                canvas.drawText("Touch screen to test single touch input", 10, 20, paint);
                canvas.drawText("Action: " + inputAction, 10, 50, paint);
                canvas.drawText("Position: " + touch.x + "," + touch.y, 10, 80, paint);
                
                if (touch.x != 0 && touch.y != 0)
                    canvas.drawCircle(touch.x, touch.y, 50, paint);
                
                
                //close the canvas
                surface.unlockCanvasAndPost(canvas);

                try {
                    Thread.sleep(20);
                }
                catch(InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}