Android应用--简、美音乐播放器实现专辑倒影效果，androidstudio设置ndk版本

5、获取音乐专辑封面并显示到界面上

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，对图像处理小巫不怎么在行，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.ByteArrayOutputSt
ream;

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
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

标签：src,ndk,paint,--,bitmap,int,androidstudio,new,Bitmap
来源： https://blog.csdn.net/m0_66155658/article/details/122666037