android利用图片实现烟花效果 android

今天突然想做一个烟花播放的效果，用粒子系统来做好像挺麻烦的。想用cocos2d-x，后来想想没必要，就想做一个自定义view，然后可以添加到程序的任何地方。在网上找了一下资料。正好有人写了，搞下来觉得不错，于是便优化一下加点注释。

工程目录如下

【android利用图片实现烟花效果】
FireWorkActivity代码很简单如下

package com.firework; import android.app.Activity; import android.os.Bundle; import android.view.Window; import android.view.WindowManager; import com.fireview.FireworkView; public class FireWorkActivity extends Activity { /** Called when the activity is first created. */ // EventListener mListener = new EventListener(); static final String LOG_TAG = FireWorkActivity.class.getSimpleName(); static int SCREEN_W = 480; // 当前窗口的大小 static int SCREEN_H = 854; FireworkView fireworkView; // get the current looper (from your Activity UI thread for instance @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); //if (getRequestedOrientation() != ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) { //setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); //} fireworkView = new FireworkView(this); setContentView(fireworkView); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); if (fireworkView.isRunning()) { fireworkView.setRunning(false); } } }

关键还是看FireworkView这个自定义视图

package com.fireview; import java.io.InputStream; import java.util.Vector; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Matrix; import android.view.MotionEvent; import android.view.View; import com.dot.Dot; import com.dot.DotFactory; import com.dot.LittleDot; import com.firework.R; /** * 类名称：FireworkView * 类描述：继承android的View，实现烟花效果 * 创建人：anan * 创建时间：2012-12-16 下午1:02:36 * 修改人：anan * 修改时间：2012-12-16 下午1:02:36 * 修改备注： * @version * */ public class FireworkView extends View { final String LOG_TAG = FireworkView.class.getSimpleName(); public static final int ID_SOUND_UP = 0; public static final int ID_SOUND_BLOW = 1; public static final int ID_SOUND_MULTIPLE = 2; final static int TIME = 5; // 圈数 /**画面中的烟花数*/ private Vector lList = new Vector(); LittleDot[] ld = new LittleDot[200]; private DotFactory df = null; boolean running = true; Bitmap backGroundBitmap; Context mContext; public static SoundPlay soundPlay; public FireworkView(Context context) { super(context); df = new DotFactory(); new MyThread().start(); mContext = context; backGroundBitmap = ReadBitMap(mContext, R.drawable.night); backGroundBitmap = resizeImage(backGroundBitmap, 480, 800); initSound(mContext); } public static void initSound(Context context) { soundPlay = new SoundPlay(); soundPlay.initSounds(context); soundPlay.loadSfx(context, R.raw.up, ID_SOUND_UP); soundPlay.loadSfx(context, R.raw.blow, ID_SOUND_BLOW); soundPlay.loadSfx(context, R.raw.multiple, ID_SOUND_MULTIPLE); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawBitmap(backGroundBitmap, 0, 0, null); synchronized (lList) { for (int i = 0; i < lList.size(); i++) { lList.get(i).myPaint(canvas, lList); } } invalidate(); } @Override public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { Dot dot = null; int rand = (int) (Math.random() * 99); dot = df.makeDot(mContext, rand, (int) event.getX(),(int) event.getY()); synchronized (lList) { lList.add(dot); soundPlay.play(ID_SOUND_UP, 0); } } return super.onTouchEvent(event); } public boolean isRunning() { return running; } public void setRunning(boolean running) { this.running = running; } public Bitmap ReadBitMap(Context context, int resId) { BitmapFactory.Options opt = new BitmapFactory.Options(); opt.inPreferredConfig = Bitmap.Config.RGB_565; opt.inPurgeable = true; opt.inInputShareable = true; // 获取资源图片 InputStream is = context.getResources().openRawResource(resId); return BitmapFactory.decodeStream(is, null, opt); } public Bitmap resizeImage(Bitmap mBitmap, int w, int h) { Bitmap BitmapOrg = mBitmap; int width = BitmapOrg.getWidth(); int height = BitmapOrg.getHeight(); int newWidth = w; int newHeight = h; float scaleWidth = ((float) newWidth) / width; float scaleHeight = ((float) newHeight) / height; Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); Bitmap tmp = Bitmap.createBitmap(BitmapOrg, 0, 0, width, height, matrix, true); return tmp; } /** * 类名称：MyThread * 类描述：重绘线程 * 创建人：anan * 创建时间：2012-12-16 下午1:06:50 * 修改人：anan * 修改时间：2012-12-16 下午1:06:50 * 修改备注： * @version * */ class MyThread extends Thread { // 用于控制烟火在空中滞留的时间 int times = 0; public void run() { Dot dot = null; while (running) {try { Thread.sleep(100); } catch (Exception e) { System.out.println(e); }synchronized (lList) { // 防止画面的烟花个数多于50个 while (lList.size() > 50) { System.out.println("当前数目超过50"); for (int i = 0; i < 10; i++) { lList.remove(i); } } //// 自动添加烟火 //if (lList.size() <= 2) { //Dot tmp = null; //int rand = (int) (Math.random() * 99); //Random random = new Random(); //tmp = df.makeDot(mContext, rand, random.nextInt(480), //50 + random.nextInt(300)); //lList.add(tmp); //} }for (int i = 0; i < lList.size(); i++) { dot = (Dot) lList.get(i); if (dot.state == 1 && !dot.whetherBlast()) { dot.rise(); } // 如果是whetherBlast()返回的是true，那么就把该dot的state设置为2 else if (dot.state == 1 && dot.state != 2) { dot.state = 2; soundPlay.play(ID_SOUND_BLOW, 0); } else if (dot.state == 3) {} // 规定，每个爆炸点最多是TIME圈，超过就会消失 if (dot.circle >= TIME) { // 在空中滞留一秒才消失 if (times >= 10) { dot.state = 4; times = 0; } else { times++; } // dot.state = 4; } } } } } }

其他代码不贴了。其实原理就是用canvas绘制图片，在烟花上升的时候不断的切换五张图片，然后烟花爆炸的时候也切换图片。整个数据都放到list中维护，用到的无非是基本的2d图形绘制

效果图

下载地址
http://download.csdn.net/detail/yunji3344/4895463