Android雪花效果 - 自定义View

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效果图

 

1.SnowView 类

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private int snowCount = 50;//雪花个数private List<SnowBean> 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() {@Overridepublic void run() {if (!isStart) return;for (int i = 0; i < snowBeanList.size(); i++) {snowBeanList.get(i).setX(snowBeanList.get(i).getX() + vX);snowBeanList.get(i).setY(snowBeanList.get(i).getY() + vY);if (snowBeanList.get(i).getX() < 0 || snowBeanList.get(i).getX() > 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 < snowCount; i++) {SnowBean bean = new SnowBean();bean.setX(getRandomX());bean.setY(getRandomY());bean.setSize((float) (Math.random() * 50) + 5);snowBeanList.add(bean);}}private float getRandomX() {return (float) (Math.random() * Tools.getWindowsWidth());}private float getRandomY() {return (float) (Math.random() * Tools.getWindowsHeight());}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {super.onLayout(changed, l, t, r, b);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);for (int i = 0; i < snowBeanList.size(); i++) {SnowBean bean = snowBeanList.get(i);paint.setTextSize(bean.getSize());paint.setColor(bean.getColor());canvas.drawText(SNOW, bean.getX(), bean.getY(), paint);}}private GestureDetector  detector = new GestureDetector(getContext(),new MyGestureDetector());private boolean isPoint = false;private long pointTime = 0;@Overridepublic boolean onTouchEvent(MotionEvent event) {
//        switch (event.getAction()) {
//            case MotionEvent.ACTION_DOWN:
//                pointTime = 0;
//                int pCount = event.getPointerCount();
//                if (pCount >= 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 {@Overridepublic boolean onDown(MotionEvent e) {return false;}@Overridepublic void onShowPress(MotionEvent e) {}@Overridepublic boolean onSingleTapUp(MotionEvent e) {return false;}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {return false;}@Overridepublic void onLongPress(MotionEvent e) {}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {return false;}@Overridepublic boolean onSingleTapConfirmed(MotionEvent e) {return false;}@Overridepublic boolean onDoubleTap(MotionEvent e) {return false;}@Overridepublic boolean onDoubleTapEvent(MotionEvent e) {return false;}}
}

2.SnowBean

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;}
}

3.Tools

    /*** 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;}