今天要实现的功能是实现专辑倒影效果，这个功能已经属于图像处理方面的了，对图像处理我不怎么在行，等一下会介绍一个很实用的工具类，专门用来进行图像处理的。这个工具类不是我写的，我只是拿来用到自己的项目当中，这已经足够了，我已经完美实现我想要的效果。

效果图：

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一个很有用的工具类

/SimpleBeautyMusicPlayer/src/com/wwj/sb/utils/ImageUtil.java

package com.wwj.sb.utils; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Bitmap.CompressFormat; import android.graphics.Bitmap.Config; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.ColorMatrix; import android.graphics.ColorMatrixColorFilter; import android.graphics.LinearGradient; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.PorterDuff.Mode; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.Shader; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; /**  * 图片工具类  * @author wwj  * 2013/7/3  */ public class ImageUtil {   /**图片的八个位置**/   public static final int TOP = 0;      //上    public static final int BOTTOM = 1;     //下   public static final int LEFT = 2;      //左   public static final int RIGHT = 3;     //右   public static final int LEFT_TOP = 4;    //左上   public static final int LEFT_BOTTOM = 5;  //左下   public static final int RIGHT_TOP = 6;   //右上   public static final int RIGHT_BOTTOM = 7;  //右下   /**    * 图像的放大缩小方法    * @param src    源位图对象    * @param scaleX  宽度比例系数    * @param scaleY  高度比例系数    * @return 返回位图对象    */   public static Bitmap zoomBitmap(Bitmap src, float scaleX, float scaleY) {     Matrix matrix = new Matrix();     matrix.setScale(scaleX, scaleY);     Bitmap t_bitmap = Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(), matrix, true);     return t_bitmap;   }   /**    * 图像放大缩小--根据宽度和高度    * @param src    * @param width    * @param height    * @return    */   public static Bitmap zoomBimtap(Bitmap src, int width, int height) {     return Bitmap.createScaledBitmap(src, width, height, true);   }   /**    * 将Drawable转为Bitmap对象    * @param drawable    * @return    */   public static Bitmap drawableToBitmap(Drawable drawable) {     return ((BitmapDrawable)drawable).getBitmap();   }   /**    * 将Bitmap转换为Drawable对象    * @param bitmap    * @return    */   public static Drawable bitmapToDrawable(Bitmap bitmap) {     Drawable drawable = new BitmapDrawable(bitmap);     return drawable;   }   /**    * Bitmap转byte[]    * @param bitmap    * @return    */   public static byte[] bitmapToByte(Bitmap bitmap) {     ByteArrayOutputStream out = new ByteArrayOutputStream();     bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);     return out.toByteArray();   }   /**    * byte[]转Bitmap    * @param data    * @return    */   public static Bitmap byteToBitmap(byte[] data) {     if(data.length != 0) {       return BitmapFactory.decodeByteArray(data, 0, data.length);     }     return null;   }   /**    * 绘制带圆角的图像    * @param src    * @param radius    * @return    */   public static Bitmap createRoundedCornerBitmap(Bitmap src, int radius) {     final int w = src.getWidth();     final int h = src.getHeight();     // 高清量32位图     Bitmap bitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);     Paint paint = new Paint();     Canvas canvas = new Canvas(bitmap);     canvas.drawARGB(0, 0, 0, 0);     paint.setColor(0xff424242);     // 防止边缘的锯齿     paint.setFilterBitmap(true);     Rect rect = new Rect(0, 0, w, h);     RectF rectf = new RectF(rect);     // 绘制带圆角的矩形     canvas.drawRoundRect(rectf, radius, radius, paint);     // 取两层绘制交集，显示上层     paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));     // 绘制图像     canvas.drawBitmap(src, rect, rect, paint);     return bitmap;   }   /**    * 创建选中带提示图片    * @param context    * @param srcId    * @param tipId    * @return    */   public static Drawable createSelectedTip(Context context, int srcId, int tipId) {     Bitmap src = BitmapFactory.decodeResource(context.getResources(), srcId);     Bitmap tip = BitmapFactory.decodeResource(context.getResources(), tipId);     final int w = src.getWidth();     final int h = src.getHeight();     Bitmap bitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);     Paint paint = new Paint();     Canvas canvas = new Canvas(bitmap);     //绘制原图     canvas.drawBitmap(src, 0, 0, paint);     //绘制提示图片     canvas.drawBitmap(tip, (w - tip.getWidth()), 0, paint);     return bitmapToDrawable(bitmap);   }   /**    * 带倒影的图像    * @param src    * @return    */   public static Bitmap createReflectionBitmap(Bitmap src) {     // 两个图像间的空隙     final int spacing = 4;     final int w = src.getWidth();     final int h = src.getHeight();     // 绘制高质量32位图     Bitmap bitmap = Bitmap.createBitmap(w, h + h / 2 + spacing, Config.ARGB_8888);     // 创建燕X轴的倒影图像     Matrix m = new Matrix();     m.setScale(1, -1);     Bitmap t_bitmap = Bitmap.createBitmap(src, 0, h / 2, w, h / 2, m, true);     Canvas canvas = new Canvas(bitmap);     Paint paint = new Paint();     // 绘制原图像     canvas.drawBitmap(src, 0, 0, paint);     // 绘制倒影图像     canvas.drawBitmap(t_bitmap, 0, h + spacing, paint);     // 线性渲染-沿Y轴高到低渲染     Shader shader = new LinearGradient(0, h + spacing, 0, h + spacing + h / 2, 0x70ffffff, 0x00ffffff, Shader.TileMode.MIRROR);     paint.setShader(shader);     // 取两层绘制交集，显示下层。     paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));     // 绘制渲染倒影的矩形     canvas.drawRect(0, h + spacing, w, h + h / 2 + spacing, paint);     return bitmap;   }   /**    * 独立的倒影图像    * @param src    * @return    */   public static Bitmap createReflectionBitmapForSingle(Bitmap src) {     final int w = src.getWidth();     final int h = src.getHeight();     // 绘制高质量32位图     Bitmap bitmap = Bitmap.createBitmap(w, h / 2, Config.ARGB_8888);     // 创建沿X轴的倒影图像     Matrix m = new Matrix();     m.setScale(1, -1);     Bitmap t_bitmap = Bitmap.createBitmap(src, 0, h / 2, w, h / 2, m, true);     Canvas canvas = new Canvas(bitmap);     Paint paint = new Paint();     // 绘制倒影图像     canvas.drawBitmap(t_bitmap, 0, 0, paint);     // 线性渲染-沿Y轴高到低渲染       Shader shader = new LinearGradient(0, 0, 0, h / 2, 0x70ffffff,         0x00ffffff, Shader.TileMode.MIRROR);     paint.setShader(shader);     // 取两层绘制交集。显示下层。     paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));     // 绘制渲染倒影的矩形     canvas.drawRect(0, 0, w, h / 2, paint);     return bitmap;   }   public static Bitmap createGreyBitmap(Bitmap src) {     final int w = src.getWidth();     final int h = src.getHeight();     Bitmap bitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);     Canvas canvas = new Canvas(bitmap);     Paint paint = new Paint();     // 颜色变换的矩阵     ColorMatrix matrix = new ColorMatrix();     // saturation 饱和度值，最小可设为0，此时对应的是灰度图；为1表示饱和度不变，设置大于1，就显示过饱和     matrix.setSaturation(0);     ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix);     paint.setColorFilter(filter);     canvas.drawBitmap(src, 0, 0, paint);     return bitmap;   }   /**    * 保存图片    * @param src    * @param filepath    * @param format:[Bitmap.CompressFormat.PNG,Bitmap.CompressFormat.JPEG]    * @return    */   public static boolean saveImage(Bitmap src, String filepath, CompressFormat format) {     boolean rs = false;     File file = new File(filepath);     try {       FileOutputStream out = new FileOutputStream(file);       if(src.compress(format, 100, out)) {         out.flush();  //写入流       }       out.close();     } catch (FileNotFoundException e) {       e.printStackTrace();     } catch (IOException e) {       e.printStackTrace();     }     return rs;   }   /**    * 添加水印效果    * @param src    源位图    * @param watermark 水印    * @param direction 方向    * @param spacing 间距    * @return    */   public static Bitmap createWatermark(Bitmap src, Bitmap watermark, int direction, int spacing) {     final int w = src.getWidth();     final int h = src.getHeight();     Bitmap bitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);     Canvas canvas = new Canvas(bitmap);     canvas.drawBitmap(src, 0, 0, null);     if(direction == LEFT_TOP) {       canvas.drawBitmap(watermark, spacing, spacing, null);     } else if(direction == LEFT_BOTTOM){       canvas.drawBitmap(watermark, spacing, h - watermark.getHeight() - spacing, null);     } else if(direction == RIGHT_TOP) {       canvas.drawBitmap(watermark, w - watermark.getWidth() - spacing, spacing, null);     } else if(direction == RIGHT_BOTTOM) {       canvas.drawBitmap(watermark, w - watermark.getWidth() - spacing, h - watermark.getHeight() - spacing, null);     }     return bitmap;   }   /**    * 合成图像    * @param direction    * @param bitmaps    * @return    */   public static Bitmap composeBitmap(int direction, Bitmap... bitmaps) {     if(bitmaps.length < 2) {       return null;     }     Bitmap firstBitmap = bitmaps[0];     for (int i = 0; i < bitmaps.length; i++) {       firstBitmap = composeBitmap(firstBitmap, bitmaps[i], direction);     }     return firstBitmap;   }   /**    * 合成两张图像    * @param firstBitmap    * @param secondBitmap    * @param direction    * @return    */   private static Bitmap composeBitmap(Bitmap firstBitmap, Bitmap secondBitmap,       int direction) {     if(firstBitmap == null) {       return null;     }     if(secondBitmap == null) {       return firstBitmap;     }     final int fw = firstBitmap.getWidth();     final int fh = firstBitmap.getHeight();     final int sw = secondBitmap.getWidth();     final int sh = secondBitmap.getHeight();     Bitmap bitmap = null;     Canvas canvas = null;     if(direction == TOP) {       bitmap = Bitmap.createBitmap(sw > fw ? sw : fw, fh + sh, Config.ARGB_8888);       canvas = new Canvas(bitmap);       canvas.drawBitmap(secondBitmap, 0, 0, null);       canvas.drawBitmap(firstBitmap, 0, sh, null);     } else if(direction == BOTTOM) {       bitmap = Bitmap.createBitmap(fw > sw ? fw : sw, fh + sh, Config.ARGB_8888);       canvas = new Canvas(bitmap);       canvas.drawBitmap(firstBitmap, 0, 0, null);       canvas.drawBitmap(secondBitmap, 0, fh, null);     } else if(direction == LEFT) {       bitmap = Bitmap.createBitmap(fw + sw, sh > fh ? sh : fh, Config.ARGB_8888);       canvas = new Canvas(bitmap);       canvas.drawBitmap(secondBitmap, 0, 0, null);       canvas.drawBitmap(firstBitmap, sw, 0, null);     } else if(direction == RIGHT) {       bitmap = Bitmap.createBitmap(fw + sw, fh > sh ? fh : sh,           Config.ARGB_8888);       canvas = new Canvas(bitmap);       canvas.drawBitmap(firstBitmap, 0, 0, null);       canvas.drawBitmap(secondBitmap, fw, 0, null);     }     return bitmap;   } }

在简、大气音乐播放器程序中的体现

我就定义了一个方法，就把专辑倒影的效果完美实现出来了。

/**    * 显示专辑封面    */   private void showArtwork(Mp3Info mp3Info) {     Bitmap bm = MediaUtil.getArtwork(this, mp3Info.getId(), mp3Info.getAlbumId(), true, false);     //切换播放时候专辑图片出现透明效果     Animation albumanim = AnimationUtils.loadAnimation(PlayerActivity.this, R.anim.album_replace);     //开始播放动画效果     musicAlbum.startAnimation(albumanim);     if(bm != null) {       musicAlbum.setImageBitmap(bm); //显示专辑封面图片       musicAblumReflection.setImageBitmap(ImageUtil.createReflectionBitmapForSingle(bm)); //显示倒影     } else {       bm = MediaUtil.getDefaultArtwork(this, false);       musicAlbum.setImageBitmap(bm); //显示专辑封面图片       musicAblumReflection.setImageBitmap(ImageUtil.createReflectionBitmapForSingle(bm)); //显示倒影     }   } 

以上内容是Android应用开发之简单、大气音乐播放器实现专辑倒影效果的全部教程，希望大家喜欢。