Android 自定义View漫飞舞超炫超浪漫特效
首先上效果，美女配雪景还是头一回哈哈！程序猿们别流口水哈！
首先新建一个SnowView类具体实现如下
package com.weixin.view;
import com.weixin.contants.SnowFlake;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
/**
* 雪花视图, DELAY时间重绘, 绘制NUM_SNOWFLAKES个雪花
*/
public class SnowView extends View {
private static final int NUM_SNOWFLAKES = 150; // 雪花数量
private static final int DELAY = 5; // 延迟
private SnowFlake[] mSnowFlakes; // 雪花
public SnowView(Context context) {
super(context);
}
public SnowView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SnowView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (w != oldw || h != oldh) {
initSnow(w, h);
}
}
private void initSnow(int width, int height) {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); // 抗锯齿
paint.setColor(Color.WHITE); // 雪花颜色白色
paint.setStyle(Paint.Style.FILL); // 填充;
mSnowFlakes = new SnowFlake[NUM_SNOWFLAKES];
//mSnowFlakes所有的雪花都生成放到这里面，循环雪花
for (int i = 0; i < NUM_SNOWFLAKES; ++i) {
mSnowFlakes[i] = SnowFlake.create(width, height, paint);
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//for返回SnowFlake
for (SnowFlake s : mSnowFlakes) {
//然后进行绘制
s.draw(canvas);
}
// 隔一段时间重绘一次, 动画效果
getHandler().postDelayed(runnable, DELAY);
}
// 重绘线程
private Runnable runnable = new Runnable() {
@Override
public void run() {
//自动刷新
invalidate();
}
};
}
布局文件这里是自定义的view改成你自己的报名com+packagename+view
android:layout_height="match_parent"
android:orientation="vertical" >
android:layout_height="match_parent"
android:background="@drawable/gril" >
android:layout_height="match_parent"
android:paddingLeft="10dp" />
然后创建SnowFlake类
package com.weixin.contants;
import com.weixin.util.RandomGenerator;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
public class SnowFlake {
/**
* 常量
*/
// 雪花的角度
private static final float ANGE_RANGE = 0.1f; // 角度范围
private static final float HALF_ANGLE_RANGE = ANGE_RANGE / 2f; // 一般的角度
private static final float HALF_PI = (float) Math.PI / 2f; // 半PI
private static final float ANGLE_SEED = 25f; // 角度随机种子
private static final float ANGLE_DIVISOR = 10000f;
// 雪花的移动速度
private static final float INCREMENT_LOWER = 2f;
private static final float INCREMENT_UPPER = 4f;
// 雪花的大小
private static final float FLAKE_SIZE_LOWER = 7f;
private static final float FLAKE_SIZE_UPPER = 20f;
private final RandomGenerator mRandom; // 随机控制器
private final Point mPosition; // 雪花位置
private float mAngle; // 角度
private final float mIncrement; // 雪花的速度
private final float mFlakeSize; // 雪花的大小
private final Paint mPaint; // 画笔
private SnowFlake(RandomGenerator random, Point position, float angle, float increment, float flakeSize, Paint paint) {
mRandom = random;
mPosition = position;
mIncrement = increment;
mFlakeSize = flakeSize;
mPaint = paint;
mAngle = angle;
}
public static SnowFlake create(int width, int height, Paint paint) {
RandomGenerator random = new RandomGenerator();
int x = random.getRandom(width);
int y = random.getRandom(height);
Point position = new Point(x, y);
float angle = random.getRandom(ANGLE_SEED) / ANGLE_SEED * ANGE_RANGE + HALF_PI - HALF_ANGLE_RANGE;
float increment = random.getRandom(INCREMENT_LOWER, INCREMENT_UPPER);
float flakeSize = random.getRandom(FLAKE_SIZE_LOWER, FLAKE_SIZE_UPPER);
return new SnowFlake(random, position, angle, increment, flakeSize, paint);
}
// 绘制雪花
public void draw(Canvas canvas) {
int width = canvas.getWidth();
int height = canvas.getHeight();
move(width, height);
canvas.drawCircle(mPosition.x, mPosition.y, mFlakeSize, mPaint);
}
// 移动雪花
private void move(int width, int height) {
//x水平方向，那么需要晃动，主要设置这个值就可以，现在取消晃动了
//如果 mPosition.x不加上后面那个值，就不会晃动了
double x = mPosition.x + (mIncrement * Math.cos(mAngle));
//y是竖直方向，就是下落
double y = mPosition.y + (mIncrement * Math.sin(mAngle));
mAngle += mRandom.getRandom(-ANGLE_SEED, ANGLE_SEED) / ANGLE_DIVISOR;
//这个是设置雪花位置，如果在很短时间内刷新一次，就是连起来的动画效果
mPosition.set((int) x, (int) y);
// 移除屏幕, 重新开始
if (!isInside(width, height)) {
// 重置雪花
reset(width);
}
}
// 判断是否在其中
private boolean isInside(int width, int height) {
int x = mPosition.x;
int y = mPosition.y;
return x > mFlakeSize -5 && x + mFlakeSize <= width && y >= -mFlakeSize - 1 && y - mFlakeSize < height;
}
// 重置雪花
private void reset(int width) {
mPosition.x = mRandom.getRandom(width);
mPosition.y = (int) (-mFlakeSize - 1); // 最上面
mAngle = mRandom.getRandom(ANGLE_SEED) / ANGLE_SEED * ANGE_RANGE + HALF_PI - HALF_ANGLE_RANGE;
}
}
创建随机生成雪花类
package com.weixin.util;
import java.util.Random;
/**
* 随机生成器工具类RandomGenerator
*/
public class RandomGenerator {
private static final Random RANDOM = new Random();
// 区间随机
public float getRandom(float lower, float upper) {
float min = Math.min(lower, upper);
float max = Math.max(lower, upper);
return getRandom(max - min) + min;
}
// 上界随机
public float getRandom(float upper) {
return RANDOM.nextFloat() * upper;
}
// 上界随机
public int getRandom(int upper) {
return RANDOM.nextInt(upper);
}
}