More about Animations tutorials

package com.example.helloandroid;

import android.app.Activity;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.os.Bundle;

import android.view.MotionEvent;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

import android.view.View.OnTouchListener;

public class Graphics_ext extends Activity implements OnTouchListener {

MySurfaceClass surfaceView;

float x1, y1, x2, y2, dX, dY, animX, animY, scaleX, scaleY;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

surfaceView = new MySurfaceClass(this);

surfaceView.setOnTouchListener(this);

x1 = 0;

y1 = 0;

x2 = y2 = 0;

animX = animY = scaleX = scaleY = dX = dY = 0;

setContentView(surfaceView);

}

@Override

protected void onPause() {

// TODO Auto-generated method stub

super.onPause();

surfaceView.pause();

}

@Override

protected void onResume() {

// TODO Auto-generated method stub

super.onResume();

surfaceView.resume();h3>

}

@Override

public boolean onTouch(View arg0, MotionEvent arg1) {

// TODO Auto-generated method stub

x2 = arg1.getX();

y2 = arg1.getY();

switch (arg1.getAction()) {

case MotionEvent.ACTION_DOWN:

x1 = arg1.getX();

y1 = arg1.getY();

animX = animY = scaleX = scaleY = dX = dY = 0;

break;

case MotionEvent.ACTION_UP:

dX = x2-x1;

dY = y2 - y1;

scaleX = dX / 50;

scaleY = dY / 50;

x1=y1=0;

}

return true;

}

public class MySurfaceClass extends SurfaceView implements Runnable {

SurfaceHolder holder;

Thread mythread = null;

boolean running = false;

Bitmap bm;

public MySurfaceClass(Context context) {

// TODO Auto-generated constructor stub

super(context);

holder = getHolder();

}

@Override

public void run() {

// TODO Auto-generated method stub

while (running) {

if (!holder.getSurface().isValid())

continue;

Canvas mycanvas = holder.lockCanvas();

mycanvas.drawRGB(120, 254, 36);

if (x1 != 0 && y1 != 0) {

bm = BitmapFactory.decodeResource(getResources(),

R.drawable.extra);

mycanvas.drawBitmap(bm, x1 - bm.getWidth() / 2,

y1 - bm.getHeight() / 2, null);

}

if (x2 != 0 && y2 != 0) {

mycanvas.drawBitmap(bm, x2 - bm.getWidth() / 2 - animX, y2

- bm.getHeight() / 2 - animY, null);

}

holder.unlockCanvasAndPost(mycanvas);

animX += scaleX;

animY += scaleY;

}

}

public void pause() {

running = false;

while (true) {

try {

mythread.join();

} catch (InterruptedException e) {

e.printStackTrace();

}

break;

}

}

public void resume() {

running = true;

mythread = new Thread(this);

mythread.start();

}

}

}