Android 滑动效果进阶篇(六)—— 倒影效果
16lz
2021-01-23
http://blog.csdn.net/sunboy_2050/article/details/7483169
上篇介绍了使用Animation实现3D动画旋转翻页效果,现在介绍图片倒影实现,先看效果图
本示例主要通过自定义Gallery和ImageAdapter(继承自BaseAdapter)实现
1、倒影绘制
ImageAdapter继承自BaseAdapter,详细实现可见Android 滑动效果入门篇(二)—— Gallery这里重点介绍倒影原理及实现
倒影原理:
倒影效果是主要由原图+间距+倒影三部分组成,高度大约为原图的3/2(原图为1、倒影为1/2)
原图,就是我们看到了最开始的图片
间距,是原图与倒影之间的间隙,如:reflectionGap = 4;
倒影,是原图下半部分1/2高度,通过矩阵变换matrix.preScale(1, -1); 获取倒立图片,然后再加上线性遮罩和阴影实现
倒影实现:
[java] view plain copy print ?
- /**反射倒影*/
- publicbooleancreateReflectedImages(){
- finalintreflectionGap=4;
- intindex=0;
- for(Map<String,Object>map:list){
- Integerid=(Integer)map.get("image");
- BitmaporiginalImage=BitmapFactory.decodeResource(mContext.getResources(),id);//获取原始图片
- intwidth=originalImage.getWidth();
- intheight=originalImage.getHeight();
- Matrixmatrix=newMatrix();
- matrix.preScale(1,-1);//图片矩阵变换(从低部向顶部的倒影)
- BitmapreflectionImage=Bitmap.createBitmap(originalImage,0,height/2,width,height/2,matrix,false);//截取原图下半部分
- BitmapbitmapWithReflection=Bitmap.createBitmap(width,(height+height/2),Config.ARGB_8888);//创建倒影图片(高度为原图3/2)
- Canvascanvas=newCanvas(bitmapWithReflection);//绘制倒影图(原图+间距+倒影)
- canvas.drawBitmap(originalImage,0,0,null);//绘制原图
- Paintpaint=newPaint();
- canvas.drawRect(0,height,width,height+reflectionGap,paint);//绘制原图与倒影的间距
- canvas.drawBitmap(reflectionImage,0,height+reflectionGap,null);//绘制倒影图
- paint=newPaint();
- LinearGradientshader=newLinearGradient(0,originalImage.getHeight(),0,bitmapWithReflection.getHeight()+reflectionGap,0x70ffffff,0x00ffffff,TileMode.CLAMP);
- paint.setShader(shader);//线性渐变效果
- paint.setXfermode(newPorterDuffXfermode(Mode.DST_IN));//倒影遮罩效果
- canvas.drawRect(0,height,width,bitmapWithReflection.getHeight()+reflectionGap,paint);//绘制倒影的阴影效果
- ImageViewimageView=newImageView(mContext);
- imageView.setImageBitmap(bitmapWithReflection);//设置倒影图片
- imageView.setLayoutParams(newmyGallery.LayoutParams(180,240));
- imageView.setScaleType(ScaleType.MATRIX);
- mImages[index++]=imageView;
- }
- returntrue;
- }
2、myGallery
自定义Gallery来实现倒影图片的浏览与选择
[java] view plain copy print ?
- publicclassmyGalleryextendsGallery{
- privateCameramCamera=newCamera();
- privateintmMaxRotationAngle=60;//最大旋转角度60
- privateintmMaxZoom=-120;
- privateintmCoveflowCenter;
- publicmyGallery(Contextcontext){
- super(context);
- this.setStaticTransformationsEnabled(true);
- }
- publicmyGallery(Contextcontext,AttributeSetattrs){
- super(context,attrs);
- this.setStaticTransformationsEnabled(true);
- }
- publicmyGallery(Contextcontext,AttributeSetattrs,intdefStyle){
- super(context,attrs,defStyle);
- this.setStaticTransformationsEnabled(true);
- }
- publicintgetMaxRotationAngle(){
- returnmMaxRotationAngle;
- }
- publicvoidsetMaxRotationAngle(intmaxRotationAngle){
- mMaxRotationAngle=maxRotationAngle;
- }
- publicintgetMaxZoom(){
- returnmMaxZoom;
- }
- publicvoidsetMaxZoom(intmaxZoom){
- mMaxZoom=maxZoom;
- }
- /**获取Gallery的中心x*/
- privateintgetCenterOfCoverflow(){
- return(getWidth()-getPaddingLeft()-getPaddingRight())/2+getPaddingLeft();
- }
- /**获取View的中心x*/
- privatestaticintgetCenterOfView(Viewview){
- returnview.getLeft()+view.getWidth()/2;
- }
- @Override
- protectedvoidonSizeChanged(intw,inth,intoldw,intoldh){
- mCoveflowCenter=getCenterOfCoverflow();
- super.onSizeChanged(w,h,oldw,oldh);
- }
- @Override
- protectedbooleangetChildStaticTransformation(Viewchild,Transformationtrans){
- finalintchildCenter=getCenterOfView(child);
- finalintchildWidth=child.getWidth();
- introtationAngle=0;
- trans.clear();
- trans.setTransformationType(Transformation.TYPE_BOTH);//alpha和matrix都变换
- if(childCenter==mCoveflowCenter){//正中间的childView
- transformImageBitmap((ImageView)child,trans,0);
- }else{//两侧的childView
- rotationAngle=(int)(((float)(mCoveflowCenter-childCenter)/childWidth)*mMaxRotationAngle);
- if(Math.abs(rotationAngle)>mMaxRotationAngle){
- rotationAngle=(rotationAngle<0)?-mMaxRotationAngle:mMaxRotationAngle;
- }
- transformImageBitmap((ImageView)child,trans,rotationAngle);
- }
- returntrue;
- }
- privatevoidtransformImageBitmap(ImageViewchild,Transformationtrans,introtationAngle){
- mCamera.save();
- finalMatriximageMatrix=trans.getMatrix();
- finalintimageHeight=child.getLayoutParams().height;
- finalintimageWidth=child.getLayoutParams().width;
- finalintrotation=Math.abs(rotationAngle);
- //在Z轴上正向移动camera的视角,实际效果为放大图片;如果在Y轴上移动,则图片上下移动;X轴上对应图片左右移动。
- mCamera.translate(0.0f,0.0f,100.0f);
- //Astheangleoftheviewgetsless,zoomin
- if(rotation<mMaxRotationAngle){
- floatzoomAmount=(float)(mMaxZoom+(rotation*1.5));
- mCamera.translate(0.0f,0.0f,zoomAmount);
- }
- mCamera.rotateY(rotationAngle);//rotationAngle为正,沿y轴向内旋转;为负,沿y轴向外旋转
- mCamera.getMatrix(imageMatrix);
- imageMatrix.preTranslate(-(imageWidth/2),-(imageHeight/2));
- imageMatrix.postTranslate((imageWidth/2),(imageHeight/2));
- mCamera.restore();
- }
- }
3、Activity
Activity中,主要实现自定义Gallery的图片填充ImageAdapter、myGallery选择事件监听、点击事件监听
[java] view plain copy print ?
- privatevoidinitRes(){
- tvTitle=(TextView)findViewById(R.id.tvTitle);
- gallery=(myGallery)findViewById(R.id.mygallery);//获取自定义的myGallery控件
- adapter=newImageAdapter(this);
- adapter.createReflectedImages();//创建倒影效果
- gallery.setAdapter(adapter);
- gallery.setOnItemSelectedListener(newOnItemSelectedListener(){//设置选择事件监听
- @Override
- publicvoidonItemSelected(AdapterView<?>parent,Viewview,intposition,longid){
- tvTitle.setText(adapter.titles[position]);
- }
- @Override
- publicvoidonNothingSelected(AdapterView<?>parent){
- }
- });
- gallery.setOnItemClickListener(newOnItemClickListener(){//设置点击事件监听
- @Override
- publicvoidonItemClick(AdapterView<?>parent,Viewview,intposition,longid){
- Toast.makeText(Main.this,"img"+(position+1)+"selected",Toast.LENGTH_SHORT).show();
- }
- });
- }
main.xml布局文件中,通过实现自定义的myGallery,来显示图片集合
[html] view plain copy print ?
- <?xmlversion="1.0"encoding="utf-8"?>
- <RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical">
- <TextView
- android:id="@+id/tvTitle"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_centerHorizontal="true"
- android:textSize="16sp"/>
- <com.homer.reflect.myGallery
- android:id="@+id/mygallery"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_below="@id/tvTitle"
- android:layout_marginTop="10dip"/>
- </RelativeLayout>
源码下载
参考推荐:
Android实现图片的倒影效果
Android中图片倒影、圆角效果重绘
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