Android笔记：图片倒影、ReflectionImage
ReflectionImage类代码:
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import
android.content.Context;
import
android.graphics.Bitmap;
import
android.graphics.Bitmap.Config;
import
android.graphics.BitmapFactory;
import
android.graphics.Canvas;
import
android.graphics.LinearGradient;
import
android.graphics.Matrix;
import
android.graphics.Paint;
import
android.graphics.PorterDuff.Mode;
import
android.graphics.PorterDuffXfermode;
import
android.graphics.Shader.TileMode;
import
android.graphics.drawable.BitmapDrawable;
import
android.util.AttributeSet;
import
android.widget.ImageView;
//图片倒影
public
class
ReflectionImage
extends
ImageView
{
// 是否为Reflection模式
private
boolean
mReflectionMode =
true
;
public
ReflectionImage(Context context)
{
super
(context);
}
public
ReflectionImage(Context context, AttributeSet attrs)
{
super
(context, attrs);
// 取得原始图片的bitmap并重画
BitmapDrawable bd = (BitmapDrawable)
this
.getDrawable();
Bitmap originalImage = bd.getBitmap();
DoReflection(originalImage);
}
public
ReflectionImage(Context context, AttributeSet attrs,
int
defStyle)
{
super
(context, attrs, defStyle);
Bitmap originalImage = ((BitmapDrawable)
this
.getDrawable()).getBitmap();
DoReflection(originalImage);
}
public
void
setReflectionMode(
boolean
isRef)
{
mReflectionMode = isRef;
}
public
boolean
getReflectionMode()
{
return
mReflectionMode;
}
// 只重写了setImageResource,和构造函数里面干了同样的事情
@Override
public
void
setImageResource(
int
resId)
{
Bitmap originalImage = BitmapFactory.decodeResource(getResources(), resId);
DoReflection(originalImage);
// super.setImageResource(resId);
}
private
void
DoReflection(Bitmap originalImage)
{
final
int
reflectionGap =
4
;
// 原始图片和反射图片中间的间距
int
width = originalImage.getWidth();
int
height = originalImage.getHeight();
// 反转
Matrix matrix =
new
Matrix();
matrix.preScale(
1
, -
1
);
// reflectionImage就是下面透明的那部分,可以设置它的高度为原始的3/4,这样效果会更好些
Bitmap reflectionImage = Bitmap.createBitmap(originalImage,
0
,
0
, width, height, matrix,
false
);
// 创建一个新的bitmap,高度为原来的两倍
Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height), Config.ARGB_8888);
Canvas canvasRef =
new
Canvas(bitmapWithReflection);
// 先画原始的图片
canvasRef.drawBitmap(originalImage,
0
,
0
,
null
);
// 画间距
Paint deafaultPaint =
new
Paint();
canvasRef.drawRect(
0
, height, width, height + reflectionGap, deafaultPaint);
// 画被反转以后的图片
canvasRef.drawBitmap(reflectionImage,
0
, height + reflectionGap,
null
);
// 创建一个渐变的蒙版放在下面被反转的图片上面
Paint paint =
new
Paint();
LinearGradient shader =
new
LinearGradient(
0
, originalImage.getHeight(),
0
, bitmapWithReflection.getHeight() + reflectionGap,
0x80ffffff
,
0x00ffffff
,
TileMode.CLAMP);
// Set the paint to use this shader (linear gradient)
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in
paint.setXfermode(
new
PorterDuffXfermode(Mode.DST_IN));
// Draw a rectangle using the paint with our linear gradient
canvasRef.drawRect(
0
, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);
// 调用ImageView中的setImageBitmap
this
.setImageBitmap(bitmapWithReflection);
}
}
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本文转自 glblong 51CTO博客，原文链接：http://blog.51cto.com/glblong/1290667，如需转载请自行联系原作者
