本文实例介绍了Android实现粒子雨效果的实现过程，分享给大家供大家参考，具体内容如下
先看看效果图：
具体实现方法：
1.baseview主要是设定雨滴要实现的动作,只是先设定,也就是抽象方法,在子类中实现其方法
2.Rainitems封装雨滴类
3.Rainitems对雨滴集合创建到面板中,显示出来,具体实现就是在这个类中
一、baseview封装类,子类继承后实现方法即可
public abstract class BaseView extends View { private control thread; public BaseView(Context context, AttributeSet attrs) { super(context, attrs); } public BaseView(Context context) { super(context); } //封装,构造画面,子类继承后需要重写 protected abstract void drawsub(Canvas canvas); //封装移动方法,子类继承后需要重写 protected abstract void move(); //封装的初始化方法 protected abstract void init(); @Override protected final void onDraw(Canvas canvas) { //启动线程 if (thread ==null) { thread = new control(); thread.start(); }else { drawsub(canvas); } } public class control extends Thread{ @Override public void run() { init(); while(true){ move(); //相当于刷新画布 postInvalidate(); try { sleep(30); } catch (InterruptedException e) { e.printStackTrace(); } } } } }
二、Rainitem雨点类
public class RainItem { private int height; private int width; private float startX; private float startY; private float stopX; private float stopY; private float sizeX; private float sizeY; private float of = 0.5f; private Paint paint; private Random random = new Random(); public RainItem(int height,int width) { this.height = height; this.width = width; init(); } public void init() { //startx和y对应的分别是起止位置 sizeX = 1 + random.nextInt(10); sizeY = 10 + random.nextInt(20); startX = random.nextInt(width); startY = random.nextInt(height); stopX = startX + sizeX; stopY = startY + sizeY; of = (float) (0.2 + random.nextFloat()); paint = new Paint(); } /** * 绘画雨滴 * @param canvas */ public void draw(Canvas canvas) { paint.setARGB(255, random.nextInt(255), random.nextInt(255), random.nextInt(255)); canvas.drawLine(startX, startY, stopX, stopY, paint); } /** * 雨滴的移动行为 */ public void movestep() { //size*of这个是用来控制速度,所谓的速度就是线条增加的速度 startX += sizeX*of; stopX += sizeX*of; startY += sizeY*of; stopY += sizeY*of; //如果超出边界则重新运行 if (startY>height) { init(); } } }
三、Rainplay具体实现的类
public class Rainplay extends BaseView { List<RainItem> list = new ArrayList<RainItem>(); //控制雨滴的数量 private int num = 80; public Rainplay(Context context) { super(context); } public Rainplay(Context context, AttributeSet attrs) { super(context, attrs); //与xml链接起来 TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.RainView); num = ta.getInteger(R.styleable.RainView_rainnum,80); ta.recycle(); } @Override protected void drawsub(Canvas canvas) { for (RainItem item : list) { item.draw(canvas); } } @Override protected void move() { for (RainItem item : list) { item.movestep(); } } /** * 因为获取长宽是放在layout之后才可以获取,所以需要 * 放在线程里面初始化 */ @Override protected void init() { for (int i = 0; i < num; i++) { RainItem item = new RainItem(getHeight(), getWidth()); list.add(item); } } }
四、value与xml文件
<"1.0" encoding="utf-8"?> <resources> <declare-styleable name = "RainView"> <attr name="rainnum" format="integer"/> </declare-styleable> </resources>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:an="http://schemas.android.com/apk/res/com.niuli.Rain" android:layout_width="match_parent" android:layout_height="match_parent" > <com.niuli.Rain.Rainplay android:layout_width="match_parent" android:layout_height="match_parent" android:background="#ff000000" an:rainnum = "100"/> </FrameLayout>
希望本文所述对大家学习Android软件编程有所帮助。
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