Android(安卓)自定义Gallery

MainActivity

package org.wp.activity;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;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.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;public class MainActivity extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);CoverFlow coverFlow = new CoverFlow(this);ImageAdapter imageAdapter = new ImageAdapter(this);imageAdapter.createReflectedImages();coverFlow.setAdapter(imageAdapter);coverFlow.setSpacing(-(int) convertDip2Pixel(this, 40));coverFlow.setSelection(2, true);coverFlow.setAnimationDuration(1000);coverFlow.setBackgroundColor(Color.WHITE);setContentView(coverFlow);}public class ImageAdapter extends BaseAdapter {private Integer[] mImageIds = { R.drawable.images1, R.drawable.images2,R.drawable.images3, R.drawable.images4, R.drawable.images5,R.drawable.images6, R.drawable.images7, R.drawable.images8,R.drawable.images9, R.drawable.images10 };private Context mContext;private ImageView[] mImages;public ImageAdapter(Context c) {mContext = c;mImages = new ImageView[mImageIds.length];}@Overridepublic int getCount() {return Integer.MAX_VALUE;}@Overridepublic Object getItem(int position) {return position;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {return mImages[position % mImages.length];}public boolean createReflectedImages() {final int reflectionGap = 4;int index = 0;for (int imageId : mImageIds) {Bitmap originalBitmap = BitmapFactory.decodeStream(mContext.getResources().openRawResource(imageId));int width = originalBitmap.getWidth();int height = originalBitmap.getHeight();Matrix matrix = new Matrix();matrix.preScale(1, -1);Bitmap reflectionBitmap = Bitmap.createBitmap(originalBitmap,0, height * 7 / 8, width, height / 8, matrix, false);Bitmap withReflectionBitmap = Bitmap.createBitmap(width,(height + height / 8 + reflectionGap), Config.ARGB_8888);Canvas canvas = new Canvas(withReflectionBitmap);canvas.drawBitmap(originalBitmap, 0, 0, null);Paint defaultPaint = new Paint();canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);canvas.drawBitmap(reflectionBitmap, 0, height + reflectionGap, null);Paint paint = new Paint();LinearGradient shader = new LinearGradient(0, originalBitmap.getHeight(), 0, withReflectionBitmap.getHeight(), 0x70ffffff, 0x00ffffff, TileMode.MIRROR);paint.setShader(shader);paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));canvas.drawRect(0, height, width, withReflectionBitmap.getHeight(), paint);ImageView imageView = new ImageView(mContext);imageView.setImageBitmap(withReflectionBitmap);imageView.setLayoutParams(new CoverFlow.LayoutParams((int) convertDip2Pixel(mContext, 120),(int) convertDip2Pixel(mContext, 300)));imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);// 消除图片移动过程中的锯齿BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();drawable.setAntiAlias(true);mImages[index++] = imageView;}return true;}}public float convertDip2Pixel(Context context, int dip) {final float scale = context.getResources().getDisplayMetrics().density;float pixel = (int) (dip * scale + 0.5f);return pixel;}}

CoverFlow

package org.wp.activity;import android.content.Context;import android.graphics.Camera;import android.graphics.Matrix;import android.util.AttributeSet;import android.view.View;import android.view.animation.Transformation;import android.widget.Gallery;import android.widget.ImageView;/** * protected void setStaticTransformationsEnabled (boolean enabled) *  * When this property is set to true, this ViewGroup supports static * transformations on children; *  * this causes getChildStaticTransformation(View, android.view.animation.Transformation)  * to be invoked when a child is drawn. *  * Any subclass overriding getChildStaticTransformation(View, * android.view.animation.Transformation) should set this property to true. *  * (Gallery ==> AbsSpinner ==> AdapterView<T extends Adapter> ==> ViewGroup) */public class CoverFlow extends Gallery {/** 视角 **/private Camera mCamera = new Camera();/** Child ImageView 最大的旋转角度 **/private int mMaxRotationAngle = 45;/** Center Child Z轴最大缩放距离 **/private int mMaxZoom = -120;/** Coverflow 的中心位置 **/private int mCoverflowCenter;/** 反转变量 **/private int lastPosition = 0;public CoverFlow(Context context) {super(context);this.setStaticTransformationsEnabled(true);}public CoverFlow(Context context, AttributeSet attrs) {super(context, attrs);this.setStaticTransformationsEnabled(true);}public CoverFlow(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);this.setStaticTransformationsEnabled(true);}public int getmMaxRotationAngle() {return mMaxRotationAngle;}public void setmMaxRotationAngle(int mMaxRotationAngle) {this.mMaxRotationAngle = mMaxRotationAngle;}public int getmMaxZoom() {return mMaxZoom;}public void setmMaxZoom(int mMaxZoom) {this.mMaxZoom = mMaxZoom;}/** 获得CoverFlow的中心点 **/private int getCenterOfCoverflow() {return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2+ getPaddingLeft();}/** 获得指定View的中心点 **/private int getCenterOfView(View view) {return view.getLeft() + view.getWidth() / 2;}/** * This method is called every time the widget changes size  * e.g. when we change the orientation of the phone from portrait to landscape.  * In the onSizeChanged method we just get the centre position  * of the coverflow widget. */@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {mCoverflowCenter = getCenterOfCoverflow();super.onSizeChanged(w, h, oldw, oldh);}@Overrideprotected int getChildDrawingOrder(int childCount, int i) {if (i == 0) lastPosition = 0;int centerPosition = getSelectedItemPosition()- getFirstVisiblePosition();// 当索引的位置是最后一个,返回中心点的child索引// 当索引的位置大于中心点child的索引,从右往左// 剩余的按正常顺序if (i == (childCount - 1)) {return centerPosition;} else if (i >= centerPosition) {lastPosition++;return childCount - lastPosition;} else {return i;}}@Overrideprotected boolean getChildStaticTransformation(View child, Transformation t) {final int childCenter = getCenterOfView(child);final int childWidth = child.getWidth();int rotationAngle = 0;t.clear();// Indicates a transformation that applies a matrix only (alpha = 1.)t.setTransformationType(Transformation.TYPE_MATRIX);// 如果图片移动到中心点if (childCenter == mCoverflowCenter) {transformImageBitmap((ImageView) child, t, 0);} else {rotationAngle = (int) (((float) (mCoverflowCenter - childCenter) / childWidth) * mMaxRotationAngle);// 最大旋转角度不超过mMaxRotationAngleif (Math.abs(rotationAngle) > mMaxRotationAngle) {rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;}transformImageBitmap((ImageView) child, t, rotationAngle);}return true;}private void transformImageBitmap(ImageView child, Transformation t,int rotationAngle) {mCamera.save();final Matrix imageMatrix = t.getMatrix();final int imageWidth = child.getLayoutParams().width;final int imageHeight = child.getLayoutParams().height;final int rotation = Math.abs(rotationAngle);// 默认的缩小值mCamera.translate(0.0f, 0.0f, 100.0f);if (rotation < mMaxRotationAngle) {// 不断的放大float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));mCamera.translate(0.0f, 0.0f, zoomAmount);}mCamera.rotateY(rotationAngle);mCamera.getMatrix(imageMatrix);imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));mCamera.restore();}}

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