Android图像处理实例解析
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一、概述
本篇文章介绍的是关于Android图像处理相关的，主要有动态修改图像的色相、饱和度及亮度，颜色矩阵，图像像素点调整、图像矩阵实现图像的平移缩放等，Xfermode相关知识点，渐变相关，图像倒影，像素块的坐标变化等等。
二、实例演示
1.色相、饱和度、亮度 
实现效果图如下： 
核心代码：
/** * 调整图像的色相、饱和度、亮度 * @param bm 需要处理的图像 * @param hue 色相 * @param saturation 饱和度 * @param lum 亮度 * @return */ public static Bitmap handleImageEffect(Bitmap bm, float hue, float saturation, float lum){ Bitmap bmp = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bmp);//创建和原图像一样大小的画布 Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); ColorMatrix hueMatrix = new ColorMatrix(); hueMatrix.setRotate(0, hue); hueMatrix.setRotate(1, hue); hueMatrix.setRotate(2, hue); ColorMatrix saturationMatrix = new ColorMatrix(); saturationMatrix.setSaturation(saturation); ColorMatrix lumMatrix = new ColorMatrix(); lumMatrix.setScale(lum, lum, lum, 1);//1：全部透明 //将之前的设置融合 ColorMatrix imageMatrix = new ColorMatrix(); imageMatrix.postConcat(hueMatrix); imageMatrix.postConcat(saturationMatrix); imageMatrix.postConcat(lumMatrix); paint.setColorFilter(new ColorMatrixColorFilter(imageMatrix)); canvas.drawBitmap(bm, 0, 0, paint);//绘制到画布 return bmp; }2.颜色矩阵 
实现效果图如下： 
核心代码：
package com.czhappy.imagedemo.activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.ColorMatrix;import android.graphics.ColorMatrixColorFilter;import android.graphics.Paint;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.EditText;import android.widget.GridLayout;import android.widget.ImageView;import com.czhappy.imagedemo.R;/** * Description:颜色矩阵 * User: chenzheng * Date: 2016/12/20 0020 * Time: 17:42 */public class ColorMatrixActivity extends AppCompatActivity { private ImageView imageview; private GridLayout gridlayout; private Bitmap bitmap; private int mEtWidth, mEtHeight; private EditText[] mEts = new EditText[20]; private float[] mColorMatrix = new float[20]; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_color_matrix); bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test1); imageview = (ImageView) findViewById(R.id.imageview); gridlayout = (GridLayout) findViewById(R.id.gridlayout); //在控件绘制完毕调用 gridlayout.post(new Runnable() { @Override public void run() { mEtWidth = gridlayout.getWidth()/5; mEtHeight = gridlayout.getHeight()/4; addEt(); initMatrix(); getMatrix(); setImageMatrix(); } }); } private void addEt(){ for (int i = 0; i < 20; i++) { EditText et = new EditText(this); mEts[i] = et; gridlayout.addView(et, mEtWidth, mEtHeight); } } private void initMatrix(){ for (int i = 0; i < 20; i++) { if(i%6==0){ mEts[i].setText("1"); }else{ mEts[i].setText("0"); } } } private void getMatrix(){ for (int i = 0; i < 20; i++) { mColorMatrix[i] = Float.parseFloat(mEts[i].getText().toString()); } } private void setImageMatrix(){ Bitmap bmp = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888); ColorMatrix colorMatrix = new ColorMatrix(); colorMatrix.set(mColorMatrix); Canvas canvas = new Canvas(bmp); Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix)); canvas.drawBitmap(bitmap, 0, 0, paint); imageview.setImageBitmap(bmp); } public void btnChange(View view){ getMatrix(); setImageMatrix(); } public void btnReset(View view){ initMatrix(); getMatrix(); setImageMatrix(); }}3.图像像素点
实现效果图如下： 
核心代码：
/** * 底片效果 * @param bm * @return */ public static Bitmap handleImageNegative(Bitmap bm){ int width = bm.getWidth(); int height = bm.getHeight(); int color; int r, g, b ,a; Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); int [] oldPx = new int[width*height];//新建像素点数组 int [] newPx = new int[width*height];//新建像素点数组 bm.getPixels(oldPx, 0, width, 0, 0, width, height); for (int i = 0; i < width*height; i++) { color = oldPx[i]; r = Color.red(color); g = Color.green(color); b = Color.blue(color); a = Color.alpha(color); r = 255-r; g = 255-g; b = 255-b; if(r>255){ r=255; }else if(r<0){ r=0; } if(g>255){ g=255; }else if(g<0){ g=0; } if(b>255){ b=255; }else if(b<0){ b=0; } newPx[i] = Color.argb(a, r, g, b);//生成新的像素点 } bmp.setPixels(newPx, 0, width, 0, 0, width, height);//将新像素点数组赋值给bitmap return bmp; } /** * 怀旧效果 * @param bm * @return */ public static Bitmap handleImageOldPhoto(Bitmap bm){ int width = bm.getWidth(); int height = bm.getHeight(); int color; int r, g, b ,a, r1, g1, b1; Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); int [] oldPx = new int[width*height];//新建像素点数组 int [] newPx = new int[width*height];//新建像素点数组 bm.getPixels(oldPx, 0, width, 0, 0, width, height); for (int i = 0; i < width*height; i++) { color = oldPx[i]; r = Color.red(color); g = Color.green(color); b = Color.blue(color); a = Color.alpha(color); r = (int)(0.393*r + 0.769*g + 0.189*b); g = (int)(0.349*r + 0.686*g + 0.168*b); b = (int)(0.272*r + 0.534*g + 0.131*b); if(r>255){ r=255; } if(g>255){ g=255; } if(b>255){ b=255; } newPx[i] = Color.argb(a, r, g, b);//生成新的像素点 } bmp.setPixels(newPx, 0, width, 0, 0, width, height);//将新像素点数组赋值给bitmap return bmp; } /** * 浮雕效果 * @param bm * @return */ public static Bitmap handleImageRelief(Bitmap bm){ int width = bm.getWidth(); int height = bm.getHeight(); int color=0, colorBefore=0; int r, g, b ,a, r1, g1, b1; Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); int [] oldPx = new int[width*height];//新建像素点数组 int [] newPx = new int[width*height];//新建像素点数组 bm.getPixels(oldPx, 0, width, 0, 0, width, height); for (int i = 1; i < width*height; i++) { colorBefore = oldPx[i-1]; r = Color.red(colorBefore); g = Color.green(colorBefore); b = Color.blue(colorBefore); a = Color.alpha(colorBefore); color = oldPx[i]; r1 = Color.red(color); g1 = Color.green(color); b1 = Color.blue(color); r = (r - r1 + 127); g = (g - g1 + 127); b = (b - b1 + 127); if(r>255){ r=255; } if(g>255){ g=255; } if(b>255){ b=255; } newPx[i] = Color.argb(a, r, g, b);//生成新的像素点 } bmp.setPixels(newPx, 0, width, 0, 0, width, height);//将新像素点数组赋值给bitmap return bmp; }4.图像矩阵 
实现效果图如下： 
核心代码：
package com.czhappy.imagedemo.activity;import android.graphics.Matrix;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.Gravity;import android.view.View;import android.widget.EditText;import android.widget.GridLayout;import com.czhappy.imagedemo.R;import com.czhappy.imagedemo.view.ImageMatrixView;/** * Description: * User: chenzheng * Date: 2016/12/21 0021 * Time: 14:54 */public class ImageMatrixActivity extends AppCompatActivity { private GridLayout gridlayout; private ImageMatrixView imageMatrixView; private int mEtWidth, mEtHeight; private EditText[] mEts = new EditText[9]; private float[] mImageMatrix = new float[9]; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_image_matrix); imageMatrixView = (ImageMatrixView) findViewById(R.id.myview); gridlayout = (GridLayout) findViewById(R.id.gridlayout); //在控件绘制完毕调用 gridlayout.post(new Runnable() { @Override public void run() { mEtWidth = gridlayout.getWidth()/3; mEtHeight = gridlayout.getHeight()/3; addEts(); initMatrix(); } }); } private void initMatrix() { for (int i = 0; i < 9; i++) { if(i%4==0){ mEts[i].setText("1"); }else{ mEts[i].setText("0"); } } } private void addEts() { for (int i = 0; i < 9; i++) { EditText et = new EditText(this); et.setGravity(Gravity.CENTER); mEts[i] = et; gridlayout.addView(et, mEtWidth, mEtHeight); } } public void btnChange(View view){ getMatrix(); Matrix matrix = new Matrix(); matrix.setValues(mImageMatrix); imageMatrixView.setImageMatrix(matrix); imageMatrixView.invalidate();//刷新 //使用系统api //doApi(); } public void btnReset(View view){ initMatrix(); getMatrix(); Matrix matrix = new Matrix(); matrix.setValues(mImageMatrix); imageMatrixView.setImageMatrix(matrix); imageMatrixView.invalidate();//刷新 } private void getMatrix(){ for (int i = 0; i < 9; i++) { mImageMatrix[i] = Float.parseFloat(mEts[i].getText().toString()); } } private void doApi(){ getMatrix(); Matrix matrix = new Matrix(); matrix.setScale(2, 2);//将图像变为原来的来2倍 matrix.postTranslate(200, 200);//平移，顺序显示 imageMatrixView.setImageMatrix(matrix); imageMatrixView.invalidate();//刷新 }}5.Xfermode 
实现效果图如下： 
核心代码：
package com.czhappy.imagedemo.view;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.RectF;import android.util.AttributeSet;import android.view.View;import com.czhappy.imagedemo.R;/** * Description:圆角图片 * User: chenzheng * Date: 2016/12/22 0022 * Time: 10:19 */public class RoundRectXfermodeView extends View { private Bitmap mBitmap, mOut; private Paint mPaint; public RoundRectXfermodeView(Context context) { super(context); initView(); } public RoundRectXfermodeView(Context context, AttributeSet attrs) { super(context, attrs); initView(); } public RoundRectXfermodeView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(); } private void initView(){ setLayerType(LAYER_TYPE_SOFTWARE, null);//禁用硬件加速 mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test1); mOut = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(mOut); mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); //绘制圆角矩形----dst canvas.drawRoundRect(new RectF(0, 0, 300, 300), 50, 50, mPaint); mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); //绘制图片----src canvas.drawBitmap(mBitmap, 0, 0, mPaint); mPaint.setXfermode(null); } @Override protected void onDraw(Canvas canvas) { canvas.drawBitmap(mOut, 0, 0, null); }}6.BitmapShader
实现效果图如下： 
核心代码：
package com.czhappy.imagedemo.view;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.BitmapShader;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Shader;import android.util.AttributeSet;import android.view.View;import com.czhappy.imagedemo.R;/** * Description: * User: chenzheng * Date: 2016/12/22 0022 * Time: 11:03 */public class BitmapShaderView extends View { private Bitmap mBitmap; private Paint mPaint; private BitmapShader mBitmapShader; public BitmapShaderView(Context context) { super(context); } public BitmapShaderView(Context context, AttributeSet attrs) { super(context, attrs); } public BitmapShaderView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onDraw(Canvas canvas) { mPaint = new Paint(); mBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher); //REPEAT:重复，CLAMP:拉伸，MIRROR:镜像 mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.MIRROR, Shader.TileMode.MIRROR); mPaint.setShader(mBitmapShader); canvas.drawCircle(200, 300, 300, mPaint); }}7.倒影
实现效果图如下： 
核心代码：
package com.czhappy.imagedemo.view;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;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.util.AttributeSet;import android.view.View;import com.czhappy.imagedemo.R;/** * Description:倒影 * User: chenzheng * Date: 2016/12/22 0022 * Time: 11:34 */public class ReflectView extends View{ private Bitmap mSrcBitmap, mRefBitmap; private Paint mPaint; public ReflectView(Context context) { super(context); initView(); } public ReflectView(Context context, AttributeSet attrs) { super(context, attrs); initView(); } public ReflectView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(); } private void initView(){ mSrcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test1); Matrix matrix = new Matrix(); matrix.setScale(1, -1);//x轴对称 mRefBitmap = Bitmap.createBitmap(mSrcBitmap, 0, 0, mSrcBitmap.getWidth(), mSrcBitmap.getHeight(), matrix, true); mPaint = new Paint(); //透明度线性渐变 mPaint.setShader(new LinearGradient(0, mSrcBitmap.getHeight(), 0, mSrcBitmap.getHeight()*1.4f, 0xdd000000, 0x10000000, Shader.TileMode.CLAMP)); mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN)); } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.BLACK); canvas.drawBitmap(mSrcBitmap, 0, 0, null); canvas.drawBitmap(mRefBitmap, 0, mSrcBitmap.getHeight(), null); canvas.drawRect(0, mRefBitmap.getHeight(), mSrcBitmap.getWidth(), mSrcBitmap.getHeight()*2, mPaint); }}8.像素块drawBitmapMesh
实现效果图如下： 
核心代码：
package com.czhappy.imagedemo.view;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.util.AttributeSet;import android.view.View;import com.czhappy.imagedemo.R;/** * Description: * User: chenzheng * Date: 2016/12/22 0022 * Time: 14:13 */public class MeshView extends View { private int WIDTH = 200;//纵向线的条数 private int HEIGHT = 200;//横向线的条数 private int COUNT = (WIDTH+1)*(HEIGHT+1); private float[] verts = new float[COUNT*2] ;//改变后的坐标 private float[] orig = new float[COUNT*2] ;//原始坐标 private Bitmap mBitmap; private float k = 1f; public MeshView(Context context) { super(context); initView(); } public MeshView(Context context, AttributeSet attrs) { super(context, attrs); initView(); } public MeshView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(); } private void initView(){ int index = 0; mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test1); float bmWidth = mBitmap.getWidth(); float bmHeight = mBitmap.getHeight(); for (int i = 0; i < HEIGHT+1; i++) { float fy = bmHeight*i/HEIGHT; for (int j = 0; j < WIDTH+1; j++) { float fx = bmWidth*j/WIDTH; orig[index*2+0] = verts[index*2+0] = fx; orig[index*2+1] = verts[index*2+1] = fy+50; index++; } } } @Override protected void onDraw(Canvas canvas) { for (int i = 0; i < HEIGHT+1; i++) { for (int j = 0; j < WIDTH+1; j++) { verts[(i*(WIDTH+1)+j)*2+0] += 0; //偏移量 float offsetY = (float) Math.sin((float)j/WIDTH*2*Math.PI + k * 2 * Math.PI); verts[(i*(WIDTH+1)+j)*2+1] = orig[(i*(WIDTH+1)+j)*2+1] + offsetY*50; } } k+=0.1f; canvas.drawBitmapMesh(mBitmap, WIDTH, HEIGHT, verts, 0, null, 0, null); invalidate();//重绘 }}三、源代码下载
http://download.csdn.net/detail/chenzheng8975/9718794
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