自定义带倒影和偏转的超炫Gallery
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自定义带倒影和偏转的超炫Gallery
分类: android小例子2012-04-10 11:015447人阅读评论(33)收藏举报androidAndroidANDROIDgalleryGalleryonFling倒影自定义 昨天晚上写的博客没有了,只好今天重新写一遍,重新学习下吧,首先,看下效果图:
先看下主类代码:
- public class GalleryDemoActivityextends Activity {
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- requestWindowFeature(Window.FEATURE_NO_TITLE);
- setContentView(R.layout.main);
-
- Integer[] images = { R.drawable.image01,
- R.drawable.image02,
- R.drawable.image03,
- R.drawable.image04,
- R.drawable.image05};
-
- ImageAdapter adapter = new ImageAdapter(this, images);
- adapter.createReflectedImages();//创建倒影效果
- GalleryFlow galleryFlow = (GalleryFlow) this.findViewById(R.id.gallery);
- galleryFlow.setFadingEdgeLength(0);
- galleryFlow.setSpacing(10);//图片之间的间距
- galleryFlow.setAdapter(adapter);
-
- galleryFlow.setOnItemClickListener(new OnItemClickListener() {
- public void onItemClick(AdapterView<?> parent, View view,
- int position, long id) {
- Toast.makeText(getApplicationContext(), String.valueOf(position), Toast.LENGTH_SHORT).show();
- }
-
- });
- galleryFlow.setSelection(4);
- }
比较简单,先来看下倒影效果是如何实现的,在ImageAdapter类里找到createReflectedImages()这个方法:
- /**
- * 创建倒影效果
- * @return
- */
- public boolean createReflectedImages() {
- //倒影图和原图之间的距离
- final int reflectionGap =4;
- int index = 0;
- for (int imageId : mImageIds) {
- //返回原图解码之后的bitmap对象
- Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);
- int width = originalImage.getWidth();
- int height = originalImage.getHeight();
- //创建矩阵对象
- Matrix matrix = new Matrix();
-
- //指定一个角度以0,0为坐标进行旋转
- // matrix.setRotate(30);
-
- //指定矩阵(x轴不变,y轴相反)
- matrix.preScale(1, -1);
-
- //将矩阵应用到该原图之中,返回一个宽度不变,高度为原图1/2的倒影位图
- Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
- height/2, width, height/2, matrix,false);
-
- //创建一个宽度不变,高度为原图+倒影图高度的位图
- Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
- (height + height / 2), Config.ARGB_8888);
-
- //将上面创建的位图初始化到画布
- Canvas canvas = new Canvas(bitmapWithReflection);
- canvas.drawBitmap(originalImage, 0, 0, null);
-
- Paint deafaultPaint = new Paint();
- deafaultPaint.setAntiAlias(false);
- // canvas.drawRect(0, height, width, height + reflectionGap,deafaultPaint);
- canvas.drawBitmap(reflectionImage, 0, height + reflectionGap,null);
- Paint paint = new Paint();
- paint.setAntiAlias(false);
-
- /**
- * 参数一:为渐变起初点坐标x位置,
- * 参数二:为y轴位置,
- * 参数三和四:分辨对应渐变终点,
- * 最后参数为平铺方式,
- * 这里设置为镜像Gradient是基于Shader类,所以我们通过Paint的setShader方法来设置这个渐变
- */
- LinearGradient shader = new LinearGradient(0,originalImage.getHeight(),0,
- bitmapWithReflection.getHeight() + reflectionGap,0x70ffffff,0x00ffffff, TileMode.MIRROR);
- //设置阴影
- paint.setShader(shader);
- paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.DST_IN));
- //用已经定义好的画笔构建一个矩形阴影渐变效果
- canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()+ reflectionGap, paint);
-
- //创建一个ImageView用来显示已经画好的bitmapWithReflection
- ImageView imageView = new ImageView(mContext);
- imageView.setImageBitmap(bitmapWithReflection);
- //设置imageView大小 ,也就是最终显示的图片大小
- imageView.setLayoutParams(new GalleryFlow.LayoutParams(200,300));
- //imageView.setScaleType(ScaleType.MATRIX);
- mImages[index++] = imageView;
- }
- return true;
- }
先获取倒影,然后把倒影和原照片合成一张图片。里面使用到了bitmap的静态方法createBitmap(),看下官方文档:
- public static Bitmap createBitmap (Bitmap source, int x, int y, int width, int height, Matrix m, boolean filter)
-
- Since: API Level 1
- Returns an immutable bitmap from subset of the source bitmap, transformed by the optional matrix. It is initialized with the same density as the original bitmap.
- Parameters
-
- source The bitmap we are subsetting
- x The x coordinate of the first pixel in source
- y The y coordinate of the first pixel in source
- width The number of pixels in each row
- height The number of rows
- m Optional matrix to be applied to the pixels
- filter true if the source should be filtered. Only applies if the matrix contains more than just translation.
- Returns
-
- A bitmap that represents the specified subset of source
- Throws
-
- IllegalArgumentException if the x, y, width, height values are outside of the dimensions of the source bitmap.
参数x、y就是开始复制的起点坐标,就是从原图的那个坐标点开始复制,width设置复制的宽度,height设置高度。因为代码中注释较详细,这里不再多说。
下面这段代码是设置渐变效果:
- /**
- * 参数一:为渐变起初点坐标x位置,
- * 参数二:为y轴位置,
- * 参数三和四:分辨对应渐变终点,
- * 最后参数为平铺方式,
- * 这里设置为镜像Gradient是基于Shader类,所以我们通过Paint的setShader方法来设置这个渐变
- */
- LinearGradient shader = new LinearGradient(0,originalImage.getHeight(),0,
- bitmapWithReflection.getHeight() + reflectionGap,0x70ffffff,0x00ffffff, TileMode.MIRROR);
看完倒影,再来看一下偏转,在main.xml文件中:
- <?xmlversion="1.0"encoding="utf-8"?>
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical"
- >
- <nsouth.jonas.android.GalleryFlow
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:gravity="center_vertical"
- android:id="@+id/gallery"
- />
- </LinearLayout>
只有一个自定义的GalleryFlow,来看下它的代码:
- public class GalleryFlowextends Gallery{
- private Camera mCamera = new Camera();//相机类
- private int mMaxRotationAngle =60;//最大转动角度
- private int mMaxZoom = -280;////最大缩放值
- private int mCoveflowCenter;//半径值
-
- public GalleryFlow(Context context) {
- super(context);
- //支持转换 ,执行getChildStaticTransformation方法
- this.setStaticTransformationsEnabled(true);
- }
-
- public GalleryFlow(Context context, AttributeSet attrs) {
- super(context, attrs);
- this.setStaticTransformationsEnabled(true);
- }
-
- public GalleryFlow(Context context, AttributeSet attrs,int defStyle) {
- super(context, attrs, defStyle);
- this.setStaticTransformationsEnabled(true);
- }
-
- /**
- * 获取旋转最大角度
- * @return
- */
- public int getMaxRotationAngle() {
- return mMaxRotationAngle;
- }
-
- /**
- * 设置旋转最大角度
- * @param maxRotationAngle
- */
- public void setMaxRotationAngle(int maxRotationAngle) {
- mMaxRotationAngle = maxRotationAngle;
- }
-
- /**
- * 获取最大缩放值
- * @return
- */
- public int getMaxZoom() {
- return mMaxZoom;
- }
-
- /**
- * 设置最大缩放值
- * @param maxZoom
- */
- public void setMaxZoom(int maxZoom) {
- mMaxZoom = maxZoom;
- }
-
- /**
- * 获取半径值
- * @return
- */
- private int getCenterOfCoverflow() {
- return (getWidth() - getPaddingLeft() - getPaddingRight()) /2
- + getPaddingLeft();
- }
-
- /**
- * @param view
- * @return
- */
- private staticint getCenterOfView(View view) {
- return view.getLeft() + view.getWidth() /2;
- }
-
- //控制gallery中每个图片的旋转(重写的gallery中方法)
- protected boolean getChildStaticTransformation(View child, Transformation t) {
- //取得当前子view的半径值
- final int childCenter = getCenterOfView(child);
- final int childWidth = child.getWidth();
- //旋转角度
- int rotationAngle = 0;
- //重置转换状态
- t.clear();
- //设置转换类型
- t.setTransformationType(Transformation.TYPE_MATRIX);
- //如果图片位于中心位置不需要进行旋转
- if (childCenter == mCoveflowCenter) {
- transformImageBitmap((ImageView) child, t, 0);
- } else {
- //根据图片在gallery中的位置来计算图片的旋转角度
- rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
- System.out.println("rotationAngle:" +rotationAngle);
- //如果旋转角度绝对值大于最大旋转角度返回(-mMaxRotationAngle或mMaxRotationAngle;)
- if (Math.abs(rotationAngle) > mMaxRotationAngle) {
- rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;
- }
- transformImageBitmap((ImageView) child, t, rotationAngle);
- }
- return true;
- }
-
- /**
- *
- */
- protected void onSizeChanged(int w,int h, int oldw,int oldh) {
- mCoveflowCenter = getCenterOfCoverflow();
- super.onSizeChanged(w, h, oldw, oldh);
- }
-
-
- private void transformImageBitmap(ImageView child, Transformation t,
- int rotationAngle) {
- //对效果进行保存
- mCamera.save();
- final Matrix imageMatrix = t.getMatrix();
- //图片高度
- final int imageHeight = child.getLayoutParams().height;
- //图片宽度
- final int imageWidth = child.getLayoutParams().width;
-
- //返回旋转角度的绝对值
- final int rotation = 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);
- // As the angle of the view gets less, zoom in
- if (rotation < mMaxRotationAngle) {
- float zoomAmount = (float) (mMaxZoom + (rotation *1.5));
- mCamera.translate(0.0f,0.0f, zoomAmount);
- }
- // 在Y轴上旋转,对应图片竖向向里翻转。
- // 如果在X轴上旋转,则对应图片横向向里翻转。
- mCamera.rotateY(rotationAngle);
- mCamera.getMatrix(imageMatrix);
- imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
- imageMatrix.postTranslate((imageWidth / 2), (imageHeight /2));
- mCamera.restore();
- }
- }
主要的方法就是:
- //控制gallery中每个图片的旋转(重写的gallery中方法)
- protected boolean getChildStaticTransformation(View child, Transformation t) {
- //取得当前子view的半径值
- final int childCenter = getCenterOfView(child);
- final int childWidth = child.getWidth();
- //旋转角度
- int rotationAngle =0;
- //重置转换状态
- t.clear();
- //设置转换类型
- t.setTransformationType(Transformation.TYPE_MATRIX);
- //如果图片位于中心位置不需要进行旋转
- if (childCenter == mCoveflowCenter) {
- transformImageBitmap((ImageView) child, t, 0);
- } else {
- //根据图片在gallery中的位置来计算图片的旋转角度
- rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
- System.out.println("rotationAngle:" +rotationAngle);
- //如果旋转角度绝对值大于最大旋转角度返回(-mMaxRotationAngle或mMaxRotationAngle;)
- if (Math.abs(rotationAngle) > mMaxRotationAngle) {
- rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;
- }
- transformImageBitmap((ImageView) child, t, rotationAngle);
- }
- return true;
- }
先根据图片所处的位置计算出需要旋转的角度,然后进行旋转:
- //根据图片在gallery中的位置来计算图片的旋转角度
- rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
- System.out.println("rotationAngle:" +rotationAngle);
- //如果旋转角度绝对值大于最大旋转角度返回(-mMaxRotationAngle或mMaxRotationAngle;)
- if (Math.abs(rotationAngle) > mMaxRotationAngle) {
- rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;
- }
- transformImageBitmap((ImageView) child, t, rotationAngle);
主要功能实现是在transformImageBitmap()这个方法:
- private void transformImageBitmap(ImageView child, Transformation t,
- int rotationAngle) {
- //对效果进行保存
- mCamera.save();
- final Matrix imageMatrix = t.getMatrix();
- //图片高度
- final int imageHeight = child.getLayoutParams().height;
- //图片宽度
- final int imageWidth = child.getLayoutParams().width;
-
- //返回旋转角度的绝对值
- final int rotation = 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);
- // As the angle of the view gets less, zoom in
- if (rotation < mMaxRotationAngle) {
- float zoomAmount = (float) (mMaxZoom + (rotation *1.5));
- mCamera.translate(0.0f, 0.0f, zoomAmount);
- }
- // 在Y轴上旋转,对应图片竖向向里翻转。
- // 如果在X轴上旋转,则对应图片横向向里翻转。
- mCamera.rotateY(rotationAngle);
- mCamera.getMatrix(imageMatrix);
- imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight /2));
- imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
- mCamera.restore();
- }
主要进行翻转操作。
关于滑动速度的修改需要重写onFling这个方法,如果想滑动一次只切换一张图片,可以试一下下面这个方法:
- private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2) {
- return e2.getX() > e1.getX();
- }
-
- @Override
- public boolean onFling(MotionEvent e1, MotionEvent e2,float velocityX, float velocityY) {
- // e1是按下的事件,e2是抬起的事件
- int keyCode;
- if (isScrollingLeft(e1, e2)) {
- keyCode = KeyEvent.KEYCODE_DPAD_LEFT;
- } else {
- keyCode = KeyEvent.KEYCODE_DPAD_RIGHT;
- }
- onKeyDown(keyCode, null);
- return true;
- }
只是简单的把onFling里面的滑动转换为了点击物理左右方向键。
说明一下:代码是从网上down来,自己只是拿来分析学习,没想欺世,也没有想过盗名。
最后,下载地址:http://download.csdn.net/detail/aomandeshangxiao/4211424
昨天晚上写的博客没有了,只好今天重新写一遍,重新学习下吧,首先,看下效果图:
先看下主类代码:
- public class GalleryDemoActivityextends Activity {
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- requestWindowFeature(Window.FEATURE_NO_TITLE);
- setContentView(R.layout.main);
- Integer[] images = { R.drawable.image01,
- R.drawable.image02,
- R.drawable.image03,
- R.drawable.image04,
- R.drawable.image05};
- ImageAdapter adapter = new ImageAdapter(this, images);
- adapter.createReflectedImages();//创建倒影效果
- GalleryFlow galleryFlow = (GalleryFlow) this.findViewById(R.id.gallery);
- galleryFlow.setFadingEdgeLength(0);
- galleryFlow.setSpacing(10);//图片之间的间距
- galleryFlow.setAdapter(adapter);
- galleryFlow.setOnItemClickListener(new OnItemClickListener() {
- public void onItemClick(AdapterView<?> parent, View view,
- int position, long id) {
- Toast.makeText(getApplicationContext(), String.valueOf(position), Toast.LENGTH_SHORT).show();
- }
- });
- galleryFlow.setSelection(4);
- }
比较简单,先来看下倒影效果是如何实现的,在ImageAdapter类里找到createReflectedImages()这个方法:
- /**
- * 创建倒影效果
- * @return
- */
- public boolean createReflectedImages() {
- //倒影图和原图之间的距离
- final int reflectionGap =4;
- int index = 0;
- for (int imageId : mImageIds) {
- //返回原图解码之后的bitmap对象
- Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);
- int width = originalImage.getWidth();
- int height = originalImage.getHeight();
- //创建矩阵对象
- Matrix matrix = new Matrix();
- //指定一个角度以0,0为坐标进行旋转
- // matrix.setRotate(30);
- //指定矩阵(x轴不变,y轴相反)
- matrix.preScale(1, -1);
- //将矩阵应用到该原图之中,返回一个宽度不变,高度为原图1/2的倒影位图
- Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
- height/2, width, height/2, matrix,false);
- //创建一个宽度不变,高度为原图+倒影图高度的位图
- Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
- (height + height / 2), Config.ARGB_8888);
- //将上面创建的位图初始化到画布
- Canvas canvas = new Canvas(bitmapWithReflection);
- canvas.drawBitmap(originalImage, 0, 0, null);
- Paint deafaultPaint = new Paint();
- deafaultPaint.setAntiAlias(false);
- // canvas.drawRect(0, height, width, height + reflectionGap,deafaultPaint);
- canvas.drawBitmap(reflectionImage, 0, height + reflectionGap,null);
- Paint paint = new Paint();
- paint.setAntiAlias(false);
- /**
- * 参数一:为渐变起初点坐标x位置,
- * 参数二:为y轴位置,
- * 参数三和四:分辨对应渐变终点,
- * 最后参数为平铺方式,
- * 这里设置为镜像Gradient是基于Shader类,所以我们通过Paint的setShader方法来设置这个渐变
- */
- LinearGradient shader = new LinearGradient(0,originalImage.getHeight(),0,
- bitmapWithReflection.getHeight() + reflectionGap,0x70ffffff,0x00ffffff, TileMode.MIRROR);
- //设置阴影
- paint.setShader(shader);
- paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.DST_IN));
- //用已经定义好的画笔构建一个矩形阴影渐变效果
- canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()+ reflectionGap, paint);
- //创建一个ImageView用来显示已经画好的bitmapWithReflection
- ImageView imageView = new ImageView(mContext);
- imageView.setImageBitmap(bitmapWithReflection);
- //设置imageView大小 ,也就是最终显示的图片大小
- imageView.setLayoutParams(new GalleryFlow.LayoutParams(200,300));
- //imageView.setScaleType(ScaleType.MATRIX);
- mImages[index++] = imageView;
- }
- return true;
- }
先获取倒影,然后把倒影和原照片合成一张图片。里面使用到了bitmap的静态方法createBitmap(),看下官方文档:
- public static Bitmap createBitmap (Bitmap source, int x, int y, int width, int height, Matrix m, boolean filter)
- Since: API Level 1
- Returns an immutable bitmap from subset of the source bitmap, transformed by the optional matrix. It is initialized with the same density as the original bitmap.
- Parameters
- source The bitmap we are subsetting
- x The x coordinate of the first pixel in source
- y The y coordinate of the first pixel in source
- width The number of pixels in each row
- height The number of rows
- m Optional matrix to be applied to the pixels
- filter true if the source should be filtered. Only applies if the matrix contains more than just translation.
- Returns
- A bitmap that represents the specified subset of source
- Throws
- IllegalArgumentException if the x, y, width, height values are outside of the dimensions of the source bitmap.
参数x、y就是开始复制的起点坐标,就是从原图的那个坐标点开始复制,width设置复制的宽度,height设置高度。
因为代码中注释较详细,这里不再多说。
下面这段代码是设置渐变效果:
- /**
- * 参数一:为渐变起初点坐标x位置,
- * 参数二:为y轴位置,
- * 参数三和四:分辨对应渐变终点,
- * 最后参数为平铺方式,
- * 这里设置为镜像Gradient是基于Shader类,所以我们通过Paint的setShader方法来设置这个渐变
- */
- LinearGradient shader = new LinearGradient(0,originalImage.getHeight(),0,
- bitmapWithReflection.getHeight() + reflectionGap,0x70ffffff,0x00ffffff, TileMode.MIRROR);
- <?xmlversion="1.0"encoding="utf-8"?>
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical"
- >
- <nsouth.jonas.android.GalleryFlow
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:gravity="center_vertical"
- android:id="@+id/gallery"
- />
- </LinearLayout>
只有一个自定义的GalleryFlow,来看下它的代码:
- public class GalleryFlowextends Gallery{
- private Camera mCamera = new Camera();//相机类
- private int mMaxRotationAngle =60;//最大转动角度
- private int mMaxZoom = -280;////最大缩放值
- private int mCoveflowCenter;//半径值
- public GalleryFlow(Context context) {
- super(context);
- //支持转换 ,执行getChildStaticTransformation方法
- this.setStaticTransformationsEnabled(true);
- }
- public GalleryFlow(Context context, AttributeSet attrs) {
- super(context, attrs);
- this.setStaticTransformationsEnabled(true);
- }
- public GalleryFlow(Context context, AttributeSet attrs,int defStyle) {
- super(context, attrs, defStyle);
- this.setStaticTransformationsEnabled(true);
- }
- /**
- * 获取旋转最大角度
- * @return
- */
- public int getMaxRotationAngle() {
- return mMaxRotationAngle;
- }
- /**
- * 设置旋转最大角度
- * @param maxRotationAngle
- */
- public void setMaxRotationAngle(int maxRotationAngle) {
- mMaxRotationAngle = maxRotationAngle;
- }
- /**
- * 获取最大缩放值
- * @return
- */
- public int getMaxZoom() {
- return mMaxZoom;
- }
- /**
- * 设置最大缩放值
- * @param maxZoom
- */
- public void setMaxZoom(int maxZoom) {
- mMaxZoom = maxZoom;
- }
- /**
- * 获取半径值
- * @return
- */
- private int getCenterOfCoverflow() {
- return (getWidth() - getPaddingLeft() - getPaddingRight()) /2
- + getPaddingLeft();
- }
- /**
- * @param view
- * @return
- */
- private staticint getCenterOfView(View view) {
- return view.getLeft() + view.getWidth() /2;
- }
- //控制gallery中每个图片的旋转(重写的gallery中方法)
- protected boolean getChildStaticTransformation(View child, Transformation t) {
- //取得当前子view的半径值
- final int childCenter = getCenterOfView(child);
- final int childWidth = child.getWidth();
- //旋转角度
- int rotationAngle = 0;
- //重置转换状态
- t.clear();
- //设置转换类型
- t.setTransformationType(Transformation.TYPE_MATRIX);
- //如果图片位于中心位置不需要进行旋转
- if (childCenter == mCoveflowCenter) {
- transformImageBitmap((ImageView) child, t, 0);
- } else {
- //根据图片在gallery中的位置来计算图片的旋转角度
- rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
- System.out.println("rotationAngle:" +rotationAngle);
- //如果旋转角度绝对值大于最大旋转角度返回(-mMaxRotationAngle或mMaxRotationAngle;)
- if (Math.abs(rotationAngle) > mMaxRotationAngle) {
- rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;
- }
- transformImageBitmap((ImageView) child, t, rotationAngle);
- }
- return true;
- }
- /**
- *
- */
- protected void onSizeChanged(int w,int h, int oldw,int oldh) {
- mCoveflowCenter = getCenterOfCoverflow();
- super.onSizeChanged(w, h, oldw, oldh);
- }
- private void transformImageBitmap(ImageView child, Transformation t,
- int rotationAngle) {
- //对效果进行保存
- mCamera.save();
- final Matrix imageMatrix = t.getMatrix();
- //图片高度
- final int imageHeight = child.getLayoutParams().height;
- //图片宽度
- final int imageWidth = child.getLayoutParams().width;
- //返回旋转角度的绝对值
- final int rotation = 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);
- // As the angle of the view gets less, zoom in
- if (rotation < mMaxRotationAngle) {
- float zoomAmount = (float) (mMaxZoom + (rotation *1.5));
- mCamera.translate(0.0f,0.0f, zoomAmount);
- }
- // 在Y轴上旋转,对应图片竖向向里翻转。
- // 如果在X轴上旋转,则对应图片横向向里翻转。
- mCamera.rotateY(rotationAngle);
- mCamera.getMatrix(imageMatrix);
- imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
- imageMatrix.postTranslate((imageWidth / 2), (imageHeight /2));
- mCamera.restore();
- }
- }
主要的方法就是:
- //控制gallery中每个图片的旋转(重写的gallery中方法)
- protected boolean getChildStaticTransformation(View child, Transformation t) {
- //取得当前子view的半径值
- final int childCenter = getCenterOfView(child);
- final int childWidth = child.getWidth();
- //旋转角度
- int rotationAngle =0;
- //重置转换状态
- t.clear();
- //设置转换类型
- t.setTransformationType(Transformation.TYPE_MATRIX);
- //如果图片位于中心位置不需要进行旋转
- if (childCenter == mCoveflowCenter) {
- transformImageBitmap((ImageView) child, t, 0);
- } else {
- //根据图片在gallery中的位置来计算图片的旋转角度
- rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
- System.out.println("rotationAngle:" +rotationAngle);
- //如果旋转角度绝对值大于最大旋转角度返回(-mMaxRotationAngle或mMaxRotationAngle;)
- if (Math.abs(rotationAngle) > mMaxRotationAngle) {
- rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;
- }
- transformImageBitmap((ImageView) child, t, rotationAngle);
- }
- return true;
- }
先根据图片所处的位置计算出需要旋转的角度,然后进行旋转:
- //根据图片在gallery中的位置来计算图片的旋转角度
- rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
- System.out.println("rotationAngle:" +rotationAngle);
- //如果旋转角度绝对值大于最大旋转角度返回(-mMaxRotationAngle或mMaxRotationAngle;)
- if (Math.abs(rotationAngle) > mMaxRotationAngle) {
- rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;
- }
- transformImageBitmap((ImageView) child, t, rotationAngle);
主要功能实现是在transformImageBitmap()这个方法:
- private void transformImageBitmap(ImageView child, Transformation t,
- int rotationAngle) {
- //对效果进行保存
- mCamera.save();
- final Matrix imageMatrix = t.getMatrix();
- //图片高度
- final int imageHeight = child.getLayoutParams().height;
- //图片宽度
- final int imageWidth = child.getLayoutParams().width;
- //返回旋转角度的绝对值
- final int rotation = 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);
- // As the angle of the view gets less, zoom in
- if (rotation < mMaxRotationAngle) {
- float zoomAmount = (float) (mMaxZoom + (rotation *1.5));
- mCamera.translate(0.0f, 0.0f, zoomAmount);
- }
- // 在Y轴上旋转,对应图片竖向向里翻转。
- // 如果在X轴上旋转,则对应图片横向向里翻转。
- mCamera.rotateY(rotationAngle);
- mCamera.getMatrix(imageMatrix);
- imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight /2));
- imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
- mCamera.restore();
- }
主要进行翻转操作。
关于滑动速度的修改需要重写onFling这个方法,如果想滑动一次只切换一张图片,可以试一下下面这个方法:
- private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2) {
- return e2.getX() > e1.getX();
- }
- @Override
- public boolean onFling(MotionEvent e1, MotionEvent e2,float velocityX, float velocityY) {
- // e1是按下的事件,e2是抬起的事件
- int keyCode;
- if (isScrollingLeft(e1, e2)) {
- keyCode = KeyEvent.KEYCODE_DPAD_LEFT;
- } else {
- keyCode = KeyEvent.KEYCODE_DPAD_RIGHT;
- }
- onKeyDown(keyCode, null);
- return true;
- }
只是简单的把onFling里面的滑动转换为了点击物理左右方向键。
说明一下:代码是从网上down来,自己只是拿来分析学习,没想欺世,也没有想过盗名。
最后,下载地址:http://download.csdn.net/detail/aomandeshangxiao/4211424
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