Android特效专辑(五)——自定义圆形头像和仿MIUI卸载动画—粒子爆炸
好的，各位亲爱的朋友，今天讲的特效还是比较炫的，首先，我们会讲一个自定义圆形的imageView，接着，我们会来实现粒子爆炸的特效，按照国际惯例，无图无真相的没这个效果也是模仿大神的，现在应用在了我的《Only》上
截图
好的，我们新建一个工程——AnimView，我们要用到的图片
一.自定义圆形头像——直接开写了，要实现的东西都在注释上了
1.编写自定义属性attr.xml
2.自定义View紧接着我们就可以编写这个类了
package com.lgl.animview;
/**
* 圆形头像
* Created by LGL on 2016/1/12.
*/
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;
/**
* 圆形ImageView，可设置最多两个宽度不同且颜色不同的圆形边框。 设置颜色在xml布局文件中由自定义属性配置参数指定
*/
public class RoundImageView extends ImageView {
private int mBorderThickness = 0;
private Context mContext;
private int defaultColor = 0xFFFFFFFF;
// 如果只有其中一个有值，则只画一个圆形边框
private int mBorderOutsideColor = 0;
private int mBorderInsideColor = 0;
// 控件默认长、宽
private int defaultWidth = 0;
private int defaultHeight = 0;
public RoundImageView(Context context) {
super(context);
mContext = context;
}
public RoundImageView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
setCustomAttributes(attrs);
}
public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
setCustomAttributes(attrs);
}
private void setCustomAttributes(AttributeSet attrs) {
// 获取自定义的属性
TypedArray a = mContext.obtainStyledAttributes(attrs,
R.styleable.roundedimageview);
mBorderThickness = a.getDimensionPixelSize(
R.styleable.roundedimageview_border_thickness, 0);
mBorderOutsideColor = a
.getColor(R.styleable.roundedimageview_border_outside_color,
defaultColor);
mBorderInsideColor = a.getColor(
R.styleable.roundedimageview_border_inside_color, defaultColor);
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (drawable == null) {
return;
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
this.measure(0, 0);
if (drawable.getClass() == NinePatchDrawable.class)
return;
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
if (defaultWidth == 0) {
defaultWidth = getWidth();
}
if (defaultHeight == 0) {
defaultHeight = getHeight();
}
int radius = 0;
if (mBorderInsideColor != defaultColor
&& mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框
radius = (defaultWidth bmpWidth) {// 高大于宽
squareWidth = squareHeight = bmpWidth;
x = 0;
y = (bmpHeight - bmpWidth) / 2;
// 截取正方形图片
squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
squareHeight);
} else if (bmpHeight 3.引用引用起来就比较简单了，我们首先来引入他的命名空间
xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"然后我们直接写xml
好的，让我们运行下吧
二.MUI卸载动画——粒子爆炸关于这个粒子特效，在开篇的时候已经展示了效果，那么我们接下来，要怎么做尼？
1.ParticleUtils用于粒子动画的单位转换
package com.lgl.animview;
import android.content.res.Resources;
/**
* 粒子动画
*/
public class ParticleUtils {
/**
* 密度
*/
public static final float DENSITY = Resources.getSystem().getDisplayMetrics().density;
public static int dp2px(int dp) {
return Math.round(dp * DENSITY);
}
}
2.Particle用于爆破效果的分子计算
package com.lgl.animview;
import java.util.Random;
import android.graphics.Point;
import android.graphics.Rect;
/**
* Created by lgl on 16/01/14. 爆破粒子
*/
public class Particle {
public static final int PART_WH = 8; // 默认小球宽高
// 原本的值（不可变）
// float originCX;
// float originCY;
// float originRadius;
// 实际的值（可变）
float cx; // center x of circle
float cy; // center y of circle
float radius;
int color;
float alpha;
static Random random = new Random();
Rect mBound;
public static Particle generateParticle(int color, Rect bound, Point point) {
int row = point.y; // 行是高
int column = point.x; // 列是宽
Particle particle = new Particle();
particle.mBound = bound;
particle.color = color;
particle.alpha = 1f;
particle.radius = PART_WH;
particle.cx = bound.left + PART_WH * column;
particle.cy = bound.top + PART_WH * row;
return particle;
}
public void advance(float factor) {
cx = cx + factor * random.nextInt(mBound.width())
* (random.nextFloat() - 0.5f);
cy = cy + factor * random.nextInt(mBound.height() / 2);
radius = radius - factor * random.nextInt(2);
alpha = (1f - factor) * (1 + random.nextFloat());
}
}
3.ExplosionAnimator属性动画，用于动画展示
package com.lgl.animview;
import android.animation.ValueAnimator;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.view.View;
/**
* Created by lgl on 16/01/14.
*/
public class ExplosionAnimator extends ValueAnimator {
public static final int DEFAULT_DURATION = 1500;
private Particle[][] mParticles;
private Paint mPaint;
private View mContainer;
public ExplosionAnimator(View view, Bitmap bitmap, Rect bound) {
mPaint = new Paint();
mContainer = view;
setFloatValues(0.0f, 1.0f);
setDuration(DEFAULT_DURATION);
mParticles = generateParticles(bitmap, bound);
}
private Particle[][] generateParticles(Bitmap bitmap, Rect bound) {
int w = bound.width();
int h = bound.height();
int partW_Count = w / Particle.PART_WH; // 横向个数
int partH_Count = h / Particle.PART_WH; // 竖向个数
int bitmap_part_w = bitmap.getWidth() / partW_Count;
int bitmap_part_h = bitmap.getHeight() / partH_Count;
Particle[][] particles = new Particle[partH_Count][partW_Count];
Point point = null;
for (int row = 0; row 4.ExplosionField开始执行这个实例的动画了
package com.lgl.animview;
import java.util.ArrayList;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
/**
* Created by lgl on 16/01/14.
*/
public class ExplosionField extends View {
private static final String TAG = "ExplosionField";
private static final Canvas mCanvas = new Canvas();
private ArrayList explosionAnimators;
private OnClickListener onClickListener;
public ExplosionField(Context context) {
super(context);
init();
}
public ExplosionField(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
explosionAnimators = new ArrayList();
attach2Activity((Activity) getContext());
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
for (ExplosionAnimator animator : explosionAnimators) {
animator.draw(canvas);
}
}
/**
* 爆破
*
* @param view
* 使得该view爆破
*/
public void explode(final View view) {
Rect rect = new Rect();
view.getGlobalVisibleRect(rect); // 得到view相对于整个屏幕的坐标
rect.offset(0, -ParticleUtils.dp2px(25)); // 去掉状态栏高度
final ExplosionAnimator animator = new ExplosionAnimator(this,
createBitmapFromView(view), rect);
explosionAnimators.add(animator);
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
view.animate().alpha(0f).setDuration(150).start();
}
@Override
public void onAnimationEnd(Animator animation) {
view.animate().alpha(1f).setDuration(150).start();
// 动画结束时从动画集中移除
explosionAnimators.remove(animation);
animation = null;
}
});
animator.start();
}
private Bitmap createBitmapFromView(View view) {
/*
* 为什么屏蔽以下代码段？ 如果ImageView直接得到位图，那么当它设置背景（backgroud)时，不会读取到背景颜色
*/
// if (view instanceof ImageView) {
// Drawable drawable = ((ImageView)view).getDrawable();
// if (drawable != null && drawable instanceof BitmapDrawable) {
// return ((BitmapDrawable) drawable).getBitmap();
// }
// }
// view.clearFocus(); //不同焦点状态显示的可能不同——（azz:不同就不同有什么关系？）
Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),
Bitmap.Config.ARGB_8888);
if (bitmap != null) {
synchronized (mCanvas) {
mCanvas.setBitmap(bitmap);
view.draw(mCanvas);
mCanvas.setBitmap(null); // 清除引用
}
}
return bitmap;
}
/**
* 给Activity加上全屏覆盖的ExplosionField
*/
private void attach2Activity(Activity activity) {
ViewGroup rootView = (ViewGroup) activity
.findViewById(Window.ID_ANDROID_CONTENT);
ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT);
rootView.addView(this, lp);
}
/**
* 希望谁有破碎效果，就给谁加Listener
*
* @param view
* 可以是ViewGroup
*/
public void addListener(View view) {
if (view instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) view;
int count = viewGroup.getChildCount();
for (int i = 0; i 5.MainActivity好的，一切准备好了之后我们就可以使用了
package com.lgl.animview;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
// 实例化粒子动画
private ExplosionField explosionField;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
explosionField = new ExplosionField(this);
// 绑定哪个控件哪个控件就有效果，如果需要整个layout，只要绑定根布局的id即可
explosionField.addListener(findViewById(R.id.iv_round));
}
}
在xml中我们什么也不用做，好的，让我们来运行一下
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