本文實例為大家分享了Android自定義View實現雪花特效展示的具體代碼，供大家參考，具體內容如下

效果圖

1.SnowView 類

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;//風向 >0 右邊飄 <0 左邊飄 private float vY = 5f;//下落速度 <0你的雪花要往上飄呀 private int snowCount = 50;//雪花個數 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() { @Override public 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()); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); } @Override protected 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; @Override public 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 { @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; } }}

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

/** * 獲取屏幕的寬度*/ 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; } /** * 獲取屏幕的高度 */ 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; }

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。