Android应用开发之简易、大气音乐播放器实现专辑倒影效果

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：

<

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; 
 
public class ImageUtil { 
   
  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 
   
  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; 
  } 
   
  public static Bitmap zoomBimtap(Bitmap src, int width, int height) { 
    return Bitmap.createScaledBitmap(src, width, height, true); 
  } 
   
  public static Bitmap drawableToBitmap(Drawable drawable) { 
    return ((BitmapDrawable)drawable).getBitmap(); 
  } 
   
  public static Drawable bitmapToDrawable(Bitmap bitmap) { 
    Drawable drawable = new BitmapDrawable(bitmap); 
    return drawable; 
  } 
   
  public static byte[] bitmapToByte(Bitmap bitmap) { 
    ByteArrayOutputStream out = new ByteArrayOutputStream(); 
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, out); 
    return out.toByteArray(); 
  } 
   
  public static Bitmap byteToBitmap(byte[] data) { 
    if(data.length != 0) { 
      return BitmapFactory.decodeByteArray(data, 0, data.length); 
    } 
    return null; 
  } 
   
  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; 
  } 
   
  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); 
  } 
   
  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; 
  } 
   
  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; 
  } 
   
  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; 
  } 
   
  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; 
  } 
   
  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; 
  } 
   
  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。

 
  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。

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