Android粒子效果 Android自定义UI之粒子效果
qq_1113502097 人气:0想了解Android自定义UI之粒子效果的相关内容吗,qq_1113502097在本文为您仔细讲解Android粒子效果的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:Android,UI,粒子效果,下面大家一起来学习吧。
1.爆炸实体类
public class Ball { public int color;//颜色 public float x;//圆心x坐标 public float y;//圆心y坐标 public float r;//粒子半径 public float vX;//粒子水平方向速度 public float vY;//粒子y方向速度 public float aX;//粒子水平方向加速度 public float ay;//粒子y方向加速度 }
2.自定义SplitView类
import android.animation.ValueAnimator; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.animation.LinearInterpolator; import androidx.annotation.Nullable; import java.util.ArrayList; import java.util.List; public class SplitView extends View { private Paint mPaint; private Bitmap mBitmap; private float d=3;//粒子直径 private ValueAnimator mAnimator; private List<Ball> mBalls=new ArrayList<>(); public SplitView(Context context) { super(context); } public SplitView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); } public SplitView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { mPaint=new Paint(); mBitmap= BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher_background); for (int i=0;i<mBitmap.getWidth();i++){ for (int j =0;j<mBitmap.getHeight();j++){ Ball ball=new Ball(); ball.color=mBitmap.getPixel(i,j); ball.x=i*d+d/2; ball.y=j*d+d/2; ball.r=d/2; //速度(-20,20) ball.vX=(float)(Math.pow(-1,Math.ceil(Math.random()*1000))*20*Math.random()); ball.vY=rangInt(-15,35); ball.aX=0; ball.ay=0.98f; mBalls.add(ball); } } mAnimator=ValueAnimator.ofFloat(0,1); mAnimator.setRepeatCount(-1);//重复次数无限 mAnimator.setDuration(2000);//重复时间 mAnimator.setInterpolator(new LinearInterpolator()); mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { upDateBall(); invalidate();//重新调用onMeasure,ondraw方法。 } }); } private int rangInt(int x,int y){ int max=Math.max(x,y); int min=Math.min(x,y); return (int)(min+Math.ceil(Math.random()*(max-min))); } private void upDateBall() { for (Ball ball:mBalls){ ball.x=ball.x+ball.vX; ball.y=ball.y+ball.vY; ball.vX+=ball.aX; ball.vY+=ball.ay; } } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.translate(500,500); for (Ball ball:mBalls){ mPaint.setColor(ball.color); canvas.drawCircle(ball.x,ball.y,ball.r,mPaint); } } @Override public boolean onTouchEvent(MotionEvent event) { if (event.getAction()==MotionEvent.ACTION_DOWN) { //触发动画 mAnimator.start(); } return super.onTouchEvent(event); } }
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