Animation 模拟纸盒的爆破

用简单的Animation动作模拟爆破的瞬间，仔细的调整各种参数效果会更像

原理：用定义好的纸张从onTouch中心点向四面八方散开，散开过程中，使用不用的速度、大小、方向、旋转角度、透明度（这里纸张可以加上火焰，效果会更好，纸张燃烧代表透明度）、位置、3D旋转；

//3D翻转 ，模拟力量方向俯冲Rotate3d rota3d = new Rotate3d((int) (Math.random()*90), (float) (Math.random()*90), (float) (Math.random()*x), (int) (Math.random()*y), 310.0f, true);  

//3D翻转//Rotate3d rota3d = new Rotate3d((int) (Math.random()*90),//(float) (Math.random()*90,0, 0, 310.0f, true);

3D动作，float centerX, float centerY 的位置能够模拟出力量的方向，如果都为0，均从中心散出

这里虽然好象有点扯淡，不过效果还是蛮像的

  1 public class MainActivity extends Activity {  2     private FrameLayout fl;  3     //定义Bitmap对象  4     Bitmap    mBit = null;  5     //AnimationSet animationSet;  6     List<ExplosionView> exvArrayList = new ArrayList<ExplosionView>();  7     List<AnimationSet> animationArrayList = new ArrayList<AnimationSet>();  8     DisplayMetrics dm;  9     private float dmw=0,dmh=0; 10     //定义碎片的形状 11     private int s1 = R.drawable.s1,s2=R.drawable.s2,s3=R.drawable.s3,s4=R.drawable.s4, 12             s5=R.drawable.s5,s6=R.drawable.s6,s7=R.drawable.s7,s8=R.drawable.s8, 13             s9=R.drawable.s9,s10=R.drawable.s10,s11=R.drawable.s11,s12=R.drawable.s12, 14             s13=R.drawable.s13,s14=R.drawable.s14; 15     private int[] chip = {s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,s12,s13,s14}; 16     private int x=1; 17     @Override 18     public void onCreate(Bundle savedInstanceState) { 19         super.onCreate(savedInstanceState); 20          21         requestWindowFeature(Window.FEATURE_NO_TITLE); 22         getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN , 23                       WindowManager.LayoutParams. FLAG_FULLSCREEN); 24          25         dm = new DisplayMetrics();    26         getWindowManager().getDefaultDisplay().getMetrics(dm);    27         //获得手机的宽度和高度像素单位为px    28         dmw = dm.widthPixels; 29         dmh = dm.heightPixels;    30          31         fl = new FrameLayout(this); 32          33         //添加50个爆炸碎片 34         for (int i = 0; i < 50; i++) { 35             int width=getResources().getDrawable(chip[x]).getIntrinsicWidth(); 36             int height=getResources().getDrawable(chip[x]).getIntrinsicHeight(); 37             fl.addView(createExv(chip[x],width,height)); 38             if(x==13){ 39                 x=0; 40             } 41             x++; 42         } 43         fl.setOnTouchListener(new LayoutListener()); 44         setContentView(fl); 45     } 46      47     public ExplosionView createExv(int chipx,int w,int h){ 48         ExplosionView exv = new ExplosionView(this,w,h); 49         exv.setImageResource(chipx); 50         exv.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT)); 51         exv.setVisibility(View.INVISIBLE);     52         exvArrayList.add(exv); 53         //animationArrayList.add(animationSet); 54         return exv; 55     } 56  57     class LayoutListener implements OnTouchListener{ 58          59         public boolean onTouch(View v, MotionEvent event) { 60             float x = event.getX(); 61             float y = event.getY(); 62              63 //            Iterator it1 = exvArrayList.iterator();    64 //            while(it1.hasNext()){    65 ////System.out.println(it1.next());  66 //                ExplosionView tempExplosion = (ExplosionView) it1.next(); 67 //                tempExplosion.setVisibility(View.VISIBLE); 68 //                tempExplosion.setLocation((int)y-20, (int)x-20); 69 //                tempExplosion.startAnimation(animation); 70 //            }    71             for(int i = 0;i < exvArrayList.size(); i ++){    72                 //System.out.println(exvArrayList.get(i));    73                 ExplosionView tempExplosion = (ExplosionView) exvArrayList.get(i); 74                 tempExplosion.setVisibility(View.VISIBLE); 75                 tempExplosion.setLocation((int)y, (int)x); 76                 AnimationSet animationSet = new AnimationSet(false); 77                  78                 //设置碎片的透明程度变化 79                 AlphaAnimation alpha = new AlphaAnimation(1.0f, 0.0f); 80                 //透明动作：减速 81                 alpha.setInterpolator(new DecelerateInterpolator()); 82                  83                  84                 //设置碎片的旋转角度 85                 RotateAnimation rotate = new RotateAnimation(0, (int) (Math.random()*330+30), 86                         Animation.RELATIVE_TO_SELF, 0.5f, 87                         Animation.RELATIVE_TO_SELF, 0.5f); 88                 //旋转动作：减速 89                 rotate.setInterpolator(new DecelerateInterpolator()); 90      91                  92                 //设置碎片的移动变化 93                 TranslateAnimation translate = new TranslateAnimation( 94                         0, 95                         (float) ( dmw/2-(Math.random()*(dmw))), 96                         0,  97                         (float) ( dmw/2-(Math.random()*(dmw)))); 98                 //移动动作：减速 99                 translate.setInterpolator(new DecelerateInterpolator());100             101                 //设置碎片的大小变化102                 ScaleAnimation scaleAnimation = new ScaleAnimation(103                         1, (float)(Math.random()), 104                         1, (float)(Math.random()),105                         Animation.RELATIVE_TO_SELF, 0,106                         Animation.RELATIVE_TO_SELF, 0);107                 //大小动作：加速度108                 scaleAnimation.setInterpolator(new AccelerateInterpolator());109                 110                 //3D翻转 ，模拟力量方向俯冲111                 Rotate3d rota3d = new Rotate3d((int) (Math.random()*90), (float) (Math.random()*90), 112                         (float) (Math.random()*x), (int) (Math.random()*y), 310.0f, true);  113                 //Rotate3d rota3d = new Rotate3d((int) (Math.random()*90), (float) (Math.random()*90), 114 //        0, 0, 310.0f, true);  115                 116                 117                 animationSet.addAnimation(alpha);118                 animationSet.addAnimation(rotate);119                 animationSet.addAnimation(translate);120                 animationSet.addAnimation(rota3d);121                 animationSet.addAnimation(scaleAnimation);122                 123                 //动画持续时间，使每个碎片的动作速度都不一样 124 //animationSet.setDuration(5000);125                 animationSet.setDuration((int) (Math.random()*4000+100));126                 //开始停顿时间127                 animationSet.setStartOffset(0);128                 animationSet.setFillAfter(true);129                 130                 tempExplosion.startAnimation(animationSet);131             }   132 133             return false;134         }135     }136     137     class ExplosionView extends ImageView{138         private int exvw,exvh;139         public ExplosionView(Context context,int ew,int eh) {140             super(context);141             this.exvw=ew;142             this.exvh=eh;143         }144         //handle the location of the explosion145         public void setLocation(int top,int left){146             this.setFrame(left, top, left+exvw, top+exvh);147         }    148     }149     150     class Rotate3d extends Animation{   151         private final float mFromDegrees;      152         private final float mToDegrees;      153         private final float mCenterX;      154         private final float mCenterY;      155         private final float mDepthZ;      156         private final boolean mReverse;      157         private Camera mCamera;  158         159         public Rotate3d(float fromDegrees, float toDegrees,float centerX, float centerY, 160                 float depthZ, boolean reverse) {          161             mFromDegrees = fromDegrees;          162             mToDegrees = toDegrees;          163             mCenterX = centerX;          164             mCenterY = centerY;          165             mDepthZ = depthZ;          166             mReverse = reverse;      167         }    168         169         @Override      170         public void initialize(int width, int height, int parentWidth, int parentHeight) {          171             super.initialize(width, height, parentWidth, parentHeight);          172             mCamera = new Camera();      173         }     174         175         @Override      176         protected void applyTransformation(float interpolatedTime, Transformation t) {          177             final float fromDegrees = mFromDegrees;          178             float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);          179             final float centerX = mCenterX;          180             final float centerY = mCenterY;          181             final Camera camera = mCamera;          182             final Matrix matrix = t.getMatrix();          183             camera.save();          184             if (mReverse) {              185                 camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);          186             } else {              187                 camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));          188             }          189             190             camera.rotateY(degrees);          191             camera.getMatrix(matrix);          192             camera.restore();           193             matrix.preTranslate(-centerX, -centerY);          194             matrix.postTranslate(centerX, centerY);      195             }  196         }

这里没结合到物理学，如果要做得更仔细，可以加有手机的重力感应和撞击屏幕边缘的反弹效果

转载于:https://www.cnblogs.com/-run/archive/2012/02/07/2341075.html

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