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。