<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > //撒花的區(qū)域 <RelativeLayout android:id="@+id/rlt_animation_layout" android:layout_width="match_parent" android:layout_height="match_parent" > </RelativeLayout> <Button android:id="@+id/btn_start" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:layout_marginBottom="23dp" android:text="開始撒花" /></RelativeLayout>

package com.lgl.test;import android.graphics.Bitmap;import android.graphics.Path;import java.io.Serializable;public class Fllower implements Serializable { private static final long serialVersionUID = 1L; private Bitmap image; private float x; private float y; private Path path; private float value; public Bitmap getResId() { return image; } public void setResId(Bitmap img) { this.image = img; } public float getX() { return x; } public void setX(float x) { this.x = x; } public float getY() { return y; } public void setY(float y) { this.y = y; } public Path getPath() { return path; } public void setPath(Path path) { this.path = path; } public float getValue() { return value; } public void setValue(float value) { this.value = value; } @Override public String toString() { return "Fllower [ x=" + x + ", y=" + y + ", path=" + path + ", value="  + value + "]"; }}

package com.lgl.test;import java.util.ArrayList;import java.util.List;import java.util.Random;import android.animation.ObjectAnimator;import android.animation.ValueAnimator;import android.animation.ValueAnimator.AnimatorUpdateListener;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PathMeasure;import android.util.Log;import android.util.TypedValue;import android.view.View;import android.view.WindowManager;import android.view.animation.AccelerateInterpolator;/** * 撒花 用到的知識點： 1、android屬性動畫 2、Path路徑繪制 3、貝塞爾曲線 */public class FllowerAnimation extends View implements AnimatorUpdateListener { /** * 動畫改變的屬性值 */ private float phase1 = 0f; private float phase2 = 0f; private float phase3 = 0f; /** * 小球集合 */ private List<Fllower> fllowers1 = new ArrayList<Fllower>(); private List<Fllower> fllowers2 = new ArrayList<Fllower>(); private List<Fllower> fllowers3 = new ArrayList<Fllower>(); /** * 動畫播放的時間 */ private int time = 4000; /** * 動畫間隔 */ private int delay = 400; int[] ylocations = { -100, -50, -25, 0 }; /** * 資源ID */ // private int resId = R.drawable.fllower_love; public FllowerAnimation(Context context) { super(context); init(context); // this.resId = resId; } @SuppressWarnings("deprecation") private void init(Context context) { WindowManager wm = (WindowManager) context  .getSystemService(Context.WINDOW_SERVICE); width = wm.getDefaultDisplay().getWidth(); height = (int) (wm.getDefaultDisplay().getHeight() * 3 / 2f); mPaint = new Paint(); mPaint.setAntiAlias(true); // mPaint.setStrokeWidth(2); // mPaint.setColor(Color.BLUE); // mPaint.setStyle(Style.STROKE); pathMeasure = new PathMeasure(); builderFollower(fllowerCount, fllowers1); builderFollower(fllowerCount, fllowers2); builderFollower(fllowerCount, fllowers3); } /** * 寬度 */ private int width = 0; /** * 高度 */ private int height = 0; /** * 曲線高度個數(shù)分割 */ private int quadCount = 10; /** * 曲度 */ private float intensity = 0.2f; /** * 第一批個數(shù) */ private int fllowerCount = 4; /** * 創(chuàng)建花 */ private void builderFollower(int count, List<Fllower> fllowers) { int max = (int) (width * 3 / 4f); int min = (int) (width / 4f); Random random = new Random(); for (int i = 0; i < count; i++) {  int s = random.nextInt(max) % (max - min + 1) + min;  Path path = new Path();  CPoint CPoint = new CPoint(s, ylocations[random.nextInt(3)]);  List<CPoint> points = builderPath(CPoint);  drawFllowerPath(path, points);  Fllower fllower = new Fllower();  fllower.setPath(path);  Bitmap bitmap = BitmapFactory.decodeResource(getResources(),   R.drawable.lift_flower);  fllower.setResId(bitmap);  fllowers.add(fllower); } } /** * 畫曲線 * * @param path * @param points */ private void drawFllowerPath(Path path, List<CPoint> points) { if (points.size() > 1) {  for (int j = 0; j < points.size(); j++) {  CPoint point = points.get(j);  if (j == 0) {   CPoint next = points.get(j + 1);   point.dx = ((next.x - point.x) * intensity);   point.dy = ((next.y - point.y) * intensity);  } else if (j == points.size() - 1) {   CPoint prev = points.get(j - 1);   point.dx = ((point.x - prev.x) * intensity);   point.dy = ((point.y - prev.y) * intensity);  } else {   CPoint next = points.get(j + 1);   CPoint prev = points.get(j - 1);   point.dx = ((next.x - prev.x) * intensity);   point.dy = ((next.y - prev.y) * intensity);  }  // create the cubic-spline path  if (j == 0) {   path.moveTo(point.x, point.y);  } else {   CPoint prev = points.get(j - 1);   path.cubicTo(prev.x + prev.dx, (prev.y + prev.dy), point.x    - point.dx, (point.y - point.dy), point.x, point.y);  }  } } } /** * 曲線搖擺的幅度 */ private int range = (int) TypedValue  .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 70, getResources()   .getDisplayMetrics()); /** * 畫路徑 * * @param point * @return */ private List<CPoint> builderPath(CPoint point) { List<CPoint> points = new ArrayList<CPoint>(); Random random = new Random(); for (int i = 0; i < quadCount; i++) {  if (i == 0) {  points.add(point);  } else {  CPoint tmp = new CPoint(0, 0);  if (random.nextInt(100) % 2 == 0) {   tmp.x = point.x + random.nextInt(range);  } else {   tmp.x = point.x - random.nextInt(range);  }  tmp.y = (int) (height / (float) quadCount * i);  points.add(tmp);  } } return points; } /** * 畫筆 */ private Paint mPaint; /** * 測量路徑的坐標位置 */ private PathMeasure pathMeasure = null; @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); drawFllower(canvas, fllowers1); drawFllower(canvas, fllowers2); drawFllower(canvas, fllowers3); } /** * 高度往上偏移量,把開始點移出屏幕頂部 */ private float dy = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,  40, getResources().getDisplayMetrics()); /** * @param canvas * @param fllowers */ private void drawFllower(Canvas canvas, List<Fllower> fllowers) { for (Fllower fllower : fllowers) {  float[] pos = new float[2];  // canvas.drawPath(fllower.getPath(),mPaint);  pathMeasure.setPath(fllower.getPath(), false);  pathMeasure.getPosTan(height * fllower.getValue(), pos, null);  // canvas.drawCircle(pos[0], pos[1], 10, mPaint);  canvas.drawBitmap(fllower.getResId(), pos[0], pos[1] - dy, null); } } ObjectAnimator mAnimator1; ObjectAnimator mAnimator2; ObjectAnimator mAnimator3; public void startAnimation() { if (mAnimator1 != null && mAnimator1.isRunning()) {  mAnimator1.cancel(); } mAnimator1 = ObjectAnimator.ofFloat(this, "phase1", 0f, 1f); mAnimator1.setDuration(time); mAnimator1.addUpdateListener(this); mAnimator1.start(); mAnimator1.setInterpolator(new AccelerateInterpolator(1f)); if (mAnimator2 != null && mAnimator2.isRunning()) {  mAnimator2.cancel(); } mAnimator2 = ObjectAnimator.ofFloat(this, "phase2", 0f, 1f); mAnimator2.setDuration(time); mAnimator2.addUpdateListener(this); mAnimator2.start(); mAnimator2.setInterpolator(new AccelerateInterpolator(1f)); mAnimator2.setStartDelay(delay); if (mAnimator3 != null && mAnimator3.isRunning()) {  mAnimator3.cancel(); } mAnimator3 = ObjectAnimator.ofFloat(this, "phase3", 0f, 1f); mAnimator3.setDuration(time); mAnimator3.addUpdateListener(this); mAnimator3.start(); mAnimator3.setInterpolator(new AccelerateInterpolator(1f)); mAnimator3.setStartDelay(delay * 2); } /** * 跟新小球的位置 * * @param value * @param fllowers */ private void updateValue(float value, List<Fllower> fllowers) { for (Fllower fllower : fllowers) {  fllower.setValue(value); } } /** * 動畫改變回調(diào) */ @Override public void onAnimationUpdate(ValueAnimator arg0) { updateValue(getPhase1(), fllowers1); updateValue(getPhase2(), fllowers2); updateValue(getPhase3(), fllowers3); Log.i(tag, getPhase1() + ""); invalidate(); } public float getPhase1() { return phase1; } public void setPhase1(float phase1) { this.phase1 = phase1; } public float getPhase2() { return phase2; } public void setPhase2(float phase2) { this.phase2 = phase2; } public float getPhase3() { return phase3; } public void setPhase3(float phase3) { this.phase3 = phase3; } private String tag = this.getClass().getSimpleName(); private class CPoint { public float x = 0f; public float y = 0f; /**  * x-axis distance  */ public float dx = 0f; /**  * y-axis distance  */ public float dy = 0f; public CPoint(float x, float y) {  this.x = x;  this.y = y; } }}

package com.lgl.test;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.RelativeLayout;public class MainActivity extends Activity { private Button btn_start; // 撒花特效 private RelativeLayout rlt_animation_layout; private FllowerAnimation fllowerAnimation; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 撒花初始化 rlt_animation_layout = (RelativeLayout) findViewById(R.id.rlt_animation_layout); rlt_animation_layout.setVisibility(View.VISIBLE); fllowerAnimation = new FllowerAnimation(this); RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(  RelativeLayout.LayoutParams.MATCH_PARENT,  RelativeLayout.LayoutParams.MATCH_PARENT); fllowerAnimation.setLayoutParams(params); rlt_animation_layout.addView(fllowerAnimation); btn_start = (Button) findViewById(R.id.btn_start); btn_start.setOnClickListener(new OnClickListener() {  @Override  public void onClick(View v) {  // 開始撒花  fllowerAnimation.startAnimation();  } }); }}