实现单张图片的倒影效果

来源：互联网发布：linux vnc服务器编辑：程序博客网时间：2024/06/10 02:03
本文章主要参考来自于：http://blog.csdn.net/zd_1471278687/article/details/13998413（谢谢分享）
在自己的需求上稍作修改：
1、图片的显示需要一个MyGallery类，
以下是MyGallery的.java
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;/** * Created by Administrator on 2016/4/22. */public class MyGallery extends Gallery {    private Camera mCamera = new Camera();    private int mMaxRotationAngle = 60;     //图片偏转角度 60    private int mMaxZoom = -120;    private int mCoveflowCenter;    public MyGallery(Context context) {        super(context);        this.setStaticTransformationsEnabled(true);    }    public MyGallery(Context context, AttributeSet attrs) {        super(context, attrs);        this.setStaticTransformationsEnabled(true);    }    public MyGallery(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        this.setStaticTransformationsEnabled(true);    }    public int getMaxRotationAngle() {        return mMaxRotationAngle;    }    public void setMaxRotationAngle(int maxRotationAngle) {        mMaxRotationAngle = maxRotationAngle;    }    public int getMaxZoom() {        return mMaxZoom;    }    public void setMaxZoom(int maxZoom) {        mMaxZoom = maxZoom;    }    /** 获得Gallery中心到边界的距离*/    private int getCenterOfCoverflow() {        return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 + getPaddingLeft();    }    /** 获得View中心位置到边界的距离 */    private static int getCenterOfView(View view) {        return view.getLeft() + view.getWidth() / 2;    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        mCoveflowCenter = getCenterOfCoverflow();        super.onSizeChanged(w, h, oldw, oldh);    }    @Override    protected boolean getChildStaticTransformation(View child, Transformation trans) {        final int childCenter = getCenterOfView(child);        final int childWidth = child.getWidth();        int rotationAngle = 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);        }        return true;    }    private void transformImageBitmap(ImageView child, Transformation trans, int rotationAngle) {        mCamera.save();        final Matrix imageMatrix = trans.getMatrix();        final int imageHeight = child.getLayoutParams().height;        final int imageWidth = child.getLayoutParams().width;        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, 200.0f);        // 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);        }        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();    }}
2、在MainActivity中的使用：
import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Shader;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ImageView;public class MainActivity extends AppCompatActivity {    private ImageView image;    Integer imgss = R.drawable.img2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        getpic();    }    private void getpic() {        final int reflectionGap = 4;//原图与倒影之间的间隙        int index = 0;        Bitmap originalImage = BitmapFactory.decodeResource(                this.getResources(), imgss); // 获得图片资源        // 获得图片的长宽        int width = originalImage.getWidth();        int height = originalImage.getHeight();        Matrix matrix = new Matrix();        matrix.preScale(1, -1); // 实现图片的反转        Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,                height / 2, width, height / 2, matrix, false); // 创建反转后的图片Bitmap对象，图片高是原图的一半        Bitmap bitmapWithReflection = Bitmap.createBitmap(width,                (height + height / 2), Bitmap.Config.ARGB_8888); // 创建标准的Bitmap对象，宽和原图一致，高是原图的1.5倍        Canvas canvas = new Canvas(bitmapWithReflection);        canvas.drawBitmap(originalImage, 0, 0, null); // 创建画布对象，将原图画于画布，起点是原点位置        Paint paint = new Paint();        canvas.drawRect(0, height, width, height + reflectionGap, paint);        canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null); // 将反转后的图片画到画布中        paint = new Paint();        LinearGradient shader = new LinearGradient(0,                originalImage.getHeight(), 0,                bitmapWithReflection.getHeight() + reflectionGap,                0x70ffffff, 0x00ffffff, Shader.TileMode.MIRROR);// 创建线性渐变LinearGradient对象        paint.setShader(shader); // 绘制        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));//倒影遮罩效果        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()                + reflectionGap, paint); // 画布画出反转图片大小区域，然后把渐变效果加到其中，就出现了图片的倒影效果        ImageView imageView = new ImageView(this);        imageView.setImageBitmap(bitmapWithReflection); // 设置带倒影的Bitmap        //设置ImageView的大小，可以根据图片大小设置        imageView.setLayoutParams(new MyGallery.LayoutParams(width, height));        //  imageView.setLayoutParams(new FancyCoverFlow.LayoutParams(250, 500));//设置ImageView的大小，可根据需要设置固定宽高        imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);//将图片按比例缩放        image = (ImageView) findViewById(R.id.imageview);        image.setImageDrawable(imageView.getDrawable());    }}
3、xml文件：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.lql.anew.gallery3d.MainActivity">    <ImageView        android:id="@+id/imageview"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>
4、最后效果：
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