Android如何用自定义View实现雪花效果

 package com.ilz.rocketapplication.handaccount.view; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.util.AttributeSet; import android.view.GestureDetector; import android.view.MotionEvent; import android.widget.RelativeLayout; import com.ilz.rocketapplication.handaccount.R; import com.ilz.rocketapplication.handaccount.bean.SnowBean; import com.ilz.rocketapplication.handaccount.utils.ColorUtils; import com.ilz.rocketapplication.handaccount.utils.Tools; import java.util.ArrayList; import java.util.List; import java.util.Timer; import java.util.TimerTask; public class SnowView extends RelativeLayout { //    private final String SNOW = "❄"; //    private final String SNOW = "☀❆★❉❈❀✿❃❁"; private final String SNOW = "❄"; private float vX = 2.5f;//风向 >0 右边飘 <0 左边飘 private float vy=5f;//下落速度 <0你的雪花要往上飘呀 int snowcount=50;//雪花个数 list snowBeanList = new ArrayList<>(); private int XB = Tools.getWindowsWidth(); private int YB = Tools.getWindowsHeight(); private Paint paint = new Paint(); private Timer timer; private boolean isStart = false; public SnowView(Context context) { this(context, null); } public SnowView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SnowView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(); } private void initView() { paint.setAntiAlias(true); initSnowData(); } public void start() { if (timer == null) { timer = new Timer(); } isStart = true; timer.schedule(new TimerTask() { @Override public void run() { if (!isStart) return; for (int i = 0; i  XB) { snowBeanList.get(i).setX(getRandomX()); } if (snowBeanList.get(i).getY() <0 || snowbeanlist.get(i).gety()> YB) { snowBeanList.get(i).setY(0f); } } postInvalidate(); } }, 0, 15); } public void resume() { if (timer == null) { start(); } isStart = true; } public void pause(){ isStart = false; } public void destroy() { isStart = false; if (snowBeanList != null) { snowBeanList.clear(); } invalidate(); if (timer != null) { timer.cancel(); timer = null; } } private void initSnowData() { for (int i = 0; i = 2) { //                    isPoint = true; //                    pointTime = System.currentTimeMillis(); //                } //                break; //            case MotionEvent.ACTION_MOVE: //                break; //            case MotionEvent.ACTION_UP: //                isPoint = false; //                pointTime = 0; //                break; //        } //        return super.onTouchEvent(event); return detector.onTouchEvent(event); } private class MyGestureDetector implements GestureDetector.OnGestureListener, GestureDetector.OnDoubleTapListener { @Override public boolean onDown(MotionEvent e) { return false; } @Override public void onShowPress(MotionEvent e) { } @Override public boolean onSingleTapUp(MotionEvent e) { return false; } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { return false; } @Override public void onLongPress(MotionEvent e) { } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { return false; } @Override public boolean onSingleTapConfirmed(MotionEvent e) { return false; } @Override public boolean onDoubleTap(MotionEvent e) { return false; } @Override public boolean onDoubleTapEvent(MotionEvent e) { return false; } } }

 package com.ilz.rocketapplication.handaccount.bean; import android.graphics.Color; import com.ilz.rocketapplication.handaccount.utils.ColorUtils; public class SnowBean { float x; float y; float size; int color = Color.WHITE; 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 float getSize() { return size; } public void setSize(float size) { this.size = size; } public int getColor() { return color; } public void setColor(int color) { this.color = color; } }

 /** * 获取屏幕的宽度 */ public static int getWindowsWidth() { WindowManager wm = (WindowManager) (MyApplication.getInstance().getSystemService(Context.WINDOW_SERVICE)); DisplayMetrics dm = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(dm); int mScreenWidth = dm.widthPixels; return mScreenWidth; } /** * 获取屏幕的高度 */ public static int getWindowsHeight() { WindowManager wm = (WindowManager) (MyApplication.getInstance().getSystemService(Context.WINDOW_SERVICE)); DisplayMetrics dm = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(dm); int mScreenHeigh = dm.heightPixels; return mScreenHeigh; }