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Android自定义图片 Android自定义图片集合

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想了解Android自定义图片集合的相关内容吗，在本文为您仔细讲解Android自定义图片的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：Android自定义图片,Android图片，下面大家一起来学习吧。

本文主要包括以下内容：

其中1,2是两种不同方式处理图片圆角的情况。3，是通过Matrix进行图片缩放，旋转等。4，是通过Matrix操作图片的处理，包括去饱和，四角黑影，中心突出等。5，图片加文字组合显示。
如果暂时感觉这些看不懂：
先看看这两篇：

Android自定义控件深入学习 Android生成随机验证码

详解Android自定义控件属性TypedArray以及attrs

1、使用Xfermode设置圆角图片
主要代码

package com.example.customimage.view; 
 
import com.example.customimage.R; 
 
import android.content.Context; 
import android.content.res.TypedArray; 
import android.graphics.Bitmap; 
import android.graphics.Bitmap.Config; 
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.util.Log; 
import android.util.TypedValue; 
import android.view.View; 
 
 
/** 
 * 自定义View，实现圆角，圆形等效果 
 */ 
public class XfermodeImageView extends View 
{ 
 //类型 
 private int type; 
 private static final int TYPE_CIRCLE = 0; //圆形 
 private static final int TYPE_RECT = 1; //矩形圆角 
 
 //原始图片 
 private Bitmap mSrc; 
 
 //矩形圆角的幅度 
 private int mRadius; 
 
 //控件的宽度 
 private int mWidth; 
 
 // 控件的高度 
 private int mHeight; 
 
 public XfermodeImageView(Context context, AttributeSet attrs) 
 { 
 this(context, attrs, 0); 
 } 
 
 public XfermodeImageView(Context context) 
 { 
 this(context, null); 
 } 
 
 /** 
 * 初始化一些自定义的参数 
 * 
 * @param context 
 * @param attrs 
 * @param defStyle 
 */ 
 public XfermodeImageView(Context context, AttributeSet attrs, int defStyle) 
 { 
 super(context, attrs, defStyle); 
 
 TypedArray a = context.getTheme().obtainStyledAttributes(attrs, 
  R.styleable.XfermodeImageView, defStyle, 0); 
 
 int n = a.getIndexCount(); 
 for (int i = 0; i < n; i++) 
 { 
  int attr = a.getIndex(i); 
  switch (attr) 
  { 
  //原始图片，在布局里面获取 
  case R.styleable.XfermodeImageView_src: 
  mSrc = BitmapFactory.decodeResource(getResources(), 
   a.getResourceId(attr, 0)); 
  break; 
  //类型属性选择 
  case R.styleable.XfermodeImageView_type: 
  //自定义类型属性，0是圆形，1是矩形圆角 
  type = a.getInt(attr, 0);// 默认为Circle 
  break; 
  //矩形圆角幅度的获取，默认是10dp 
  case R.styleable.XfermodeImageView_borderRadius: 
  mRadius = a.getDimensionPixelSize(attr, (int) TypedValue 
   .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10f, 
    getResources().getDisplayMetrics())); 
  Log.i("Show", String.valueOf(mRadius)); 
  break; 
  } 
 } 
 a.recycle(); 
 } 
 
 /** 
 * 计算控件的高度和宽度 
 */ 
 @Override 
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
 { 
 // 设置宽度 
 int specMode = MeasureSpec.getMode(widthMeasureSpec); 
 int specSize = MeasureSpec.getSize(widthMeasureSpec); 
 
 //match_parent或者设置的精确值获取 
 //MeasureSpec.EXACTLY 
 if (specMode == MeasureSpec.EXACTLY) 
 { 
  mWidth = specSize; 
 } 
 else 
 { 
  // 由图片决定的宽 
  //getPaddingLeft(),getPaddingRight()这两个值是控件属性的向内偏移的距离值，所以的一起计算 
  //区别于layout_marginLeft,两个控件的左间距值设置 
  int desireByImg = getPaddingLeft() + getPaddingRight() 
   + mSrc.getWidth(); 
  
  // wrap_content 
  if (specMode == MeasureSpec.AT_MOST) 
  { 
  //所以最小的值，宽度的话是左右内偏移距离之和 
  mWidth = Math.min(desireByImg, specSize); 
  } else 
 
  mWidth = desireByImg; 
 } 
 
 // 设置高度，部分解释同上 
 specMode = MeasureSpec.getMode(heightMeasureSpec); 
 specSize = MeasureSpec.getSize(heightMeasureSpec); 
  
 //match_parent或者设置的精确值获取 
 //MeasureSpec.EXACTLY 
 if (specMode == MeasureSpec.EXACTLY) 
 { 
  mHeight = specSize; 
 } else 
 { 
  int desire = getPaddingTop() + getPaddingBottom() 
   + mSrc.getHeight(); 
 
  // wrap_content 
  if (specMode == MeasureSpec.AT_MOST) 
  { 
  mHeight = Math.min(desire, specSize); 
  } else 
  mHeight = desire; 
 } 
 
 //计算好的宽度以及高度是值，设置进去 
 setMeasuredDimension(mWidth, mHeight); 
 } 
 
 /** 
 * 绘制image控件 
 */ 
 @Override 
 protected void onDraw(Canvas canvas) 
 { 
 switch (type) 
 { 
 // 如果是TYPE_CIRCLE绘制圆形 
 case TYPE_CIRCLE: 
  //圆形宽度和高度应该一致的，所以也要比较一下大小，取小的值 
  int min = Math.min(mWidth, mHeight); 
  // 圆形宽度和高度如果不一致，按小的值进行压缩 
  mSrc = Bitmap.createScaledBitmap(mSrc, min, min, false); 
  //绘制圆形 
  canvas.drawBitmap(createCircleImage(mSrc, min), 0, 0, null); 
  break; 
 case TYPE_RECT: 
  canvas.drawBitmap(createRoundConerImage(mSrc), 0, 0, null); 
  break; 
 
 } 
 
 } 
 
 /** 
 * 根据原图和变长绘制圆形图片 
 * 
 * @param source 
 * @param min 
 * @return 
 */ 
 private Bitmap createCircleImage(Bitmap source, int min) 
 { 
 final Paint paint = new Paint(); 
 //防止边缘的抗锯齿 
 paint.setAntiAlias(true); 
  
 Bitmap target = Bitmap.createBitmap(min, min, Config.ARGB_8888); 
 // 产生一个同样大小的画布 
 Canvas canvas = new Canvas(target); 
 // 首先绘制圆形,除以2就是半径了 
 //最主要设置第三个参数为min/2，圆角幅度那么大就是圆形了 
 canvas.drawCircle(min / 2, min / 2, min/2, paint); 
 // 使用SRC_IN，参考上面的说明---上下层都显示。下层居上显示 
 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); 
 // 绘制图片 
 canvas.drawBitmap(source, 0, 0, paint); 
 return target; 
 } 
 
 /** 
 * 根据原图添加圆角 
 * 
 * @param source 
 * @return 
 */ 
 private Bitmap createRoundConerImage(Bitmap source) 
 { 
 final Paint paint = new Paint(); 
 paint.setAntiAlias(true); 
 Bitmap target = Bitmap.createBitmap(mWidth, mHeight, Config.ARGB_8888); 
 Canvas canvas = new Canvas(target); 
 //绘制矩形 
 RectF rect = new RectF(0, 0, source.getWidth(), source.getHeight()); 
 //设置圆角幅度 
 canvas.drawRoundRect(rect, mRadius, mRadius, paint); 
 // 使用SRC_IN，参考上面的说明---上下层都显示。下层居上显示 
 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); 
 canvas.drawBitmap(source, 0, 0, paint); 
 return target; 
 } 
}

2、使用BitmapShader设置圆角图片

package com.example.customimage.view; 
 
import com.example.customimage.R; 
 
import android.content.Context; 
import android.content.res.TypedArray; 
import android.graphics.Bitmap; 
import android.graphics.BitmapShader; 
import android.graphics.Canvas; 
import android.graphics.Matrix; 
import android.graphics.Paint; 
import android.graphics.RectF; 
import android.graphics.Shader.TileMode; 
import android.graphics.drawable.BitmapDrawable; 
import android.graphics.drawable.Drawable; 
import android.os.Bundle; 
import android.os.Parcelable; 
import android.util.AttributeSet; 
import android.util.Log; 
import android.util.TypedValue; 
import android.widget.ImageView; 
 
/** 
 * 
 */ 
public class BitmapShaderImageView extends ImageView 
{ 
 // 图片的类型，圆形or圆角 
 private int type; 
 public static final int TYPE_CIRCLE = 0; 
 public static final int TYPE_RECT = 1; 
 //圆角大小的默认值 
 private static final int BODER_RADIUS_DEFAULT = 10; 
 //圆角的大小 
 private int mBorderRadius; 
 
 // 绘图的Paint 
 private Paint mBitmapPaint; 
 //圆角的半径 
 private int mRadius; 
 // 3x3 矩阵，主要用于缩小放大 
 private Matrix mMatrix; 
 // 渲染图像，使用图像为绘制图形着色 
 private BitmapShader mBitmapShader; 
 // view的宽度 
 private int mWidth; 
 //矩形 
 private RectF mRoundRect; 
 
 public BitmapShaderImageView(Context context) 
 { 
 this(context, null); 
 } 
 
 public BitmapShaderImageView(Context context, AttributeSet attrs) 
 { 
 super(context, attrs); 
 mMatrix = new Matrix(); 
 mBitmapPaint = new Paint(); 
 mBitmapPaint.setAntiAlias(true); 
 
 TypedArray a = context.obtainStyledAttributes(attrs, 
  R.styleable.BitmapShaderImageView); 
 //矩形圆角幅度的获取，默认是10dp 
 mBorderRadius = a.getDimensionPixelSize( 
  R.styleable.BitmapShaderImageView_borderRadius, (int) TypedValue 
   .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 
    BODER_RADIUS_DEFAULT, getResources() 
     .getDisplayMetrics())); 
 //自定义类型属性，0是圆形，1是矩形圆角 
 type = a.getInt(R.styleable.BitmapShaderImageView_type, TYPE_CIRCLE); 
 
 a.recycle(); 
 } 
 
 @Override 
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
 { 
 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
 
 // 如果类型是圆形，则强制改变view的宽高一致，以小值为准 
 if (type == TYPE_CIRCLE) 
 { 
  mWidth = Math.min(getMeasuredWidth(), getMeasuredHeight()); 
  //圆形的半径 
  mRadius = mWidth / 2; 
  setMeasuredDimension(mWidth, mWidth); 
 } 
 
 } 
 
 // 初始化BitmapShader,获取到图片资源 
 // 等待画布的准备好，然后在画布上加上Paint就是了 
 //就是说图片的载体是Paint 
 private void setUpShader() 
 { 
 Drawable drawable = getDrawable(); 
 if (drawable == null) 
 { 
  return; 
 } 
 
 Bitmap bmp = drawableToBitamp(drawable); 
 // 将bmp作为着色器，就是在指定区域内绘制bmp 
 //TileMode.CLAMP 拉伸 
 mBitmapShader = new BitmapShader(bmp, TileMode.CLAMP, TileMode.CLAMP); 
 float scale = 1.0f; 
 if (type == TYPE_CIRCLE) 
 { 
  // 拿到bitmap宽或高的小值 
  int bSize = Math.min(bmp.getWidth(), bmp.getHeight()); 
  scale = mWidth * 1.0f / bSize; 
 
 } else if (type == TYPE_RECT) 
 { 
  if (!(bmp.getWidth() == getWidth() && bmp.getHeight() == getHeight())) 
  { 
  // 如果图片的宽或者高与view的宽高不匹配，计算出需要缩放的比例；缩放后的图片的宽高，一定要大于我们view的宽高；所以我们这里取大值； 
  scale = Math.max(getWidth() * 1.0f / bmp.getWidth(), 
   getHeight() * 1.0f / bmp.getHeight()); 
  } 
 
 } 
 // shader的变换矩阵，我们这里主要用于放大或者缩小 
 // scale * scale 的矩阵 
 mMatrix.setScale(scale, scale); 
 // 设置变换矩阵 
 mBitmapShader.setLocalMatrix(mMatrix); 
 // 设置shader 
 mBitmapPaint.setShader(mBitmapShader); 
 } 
 
 @Override 
 protected void onDraw(Canvas canvas) 
 { 
 if (getDrawable() == null) 
 { 
  return; 
 } 
 setUpShader(); 
 
 if (type == TYPE_RECT) 
 { 
  //绘制矩形 
  canvas.drawRoundRect(mRoundRect, mBorderRadius, mBorderRadius, 
   mBitmapPaint); 
 } else 
 { 
  //绘制圆形 
  canvas.drawCircle(mRadius, mRadius, mRadius, mBitmapPaint); 
 } 
 } 
 
 @Override 
 protected void onSizeChanged(int w, int h, int oldw, int oldh) 
 { 
 super.onSizeChanged(w, h, oldw, oldh); 
 
 // 圆角图片的范围 
 if (type == TYPE_RECT) 
  mRoundRect = new RectF(0, 0, w, h); 
 } 
 
 //drawable转bitmap 
 private Bitmap drawableToBitamp(Drawable drawable) 
 { 
 //从控件的src获取背景，也是drawable文件获取 
 if (drawable instanceof BitmapDrawable) 
 { 
  BitmapDrawable bd = (BitmapDrawable) drawable; 
  return bd.getBitmap(); 
 } 
  
 //如果没有绘图一个，只不过是空白的图片 
 int w = drawable.getIntrinsicWidth(); 
 int h = drawable.getIntrinsicHeight(); 
  
 Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 
 Canvas canvas = new Canvas(bitmap); 
 drawable.setBounds(0, 0, w, h); 
 drawable.draw(canvas); 
 return bitmap; 
 } 
 
 private static final String STATE_INSTANCE = "state_instance"; 
 private static final String STATE_TYPE = "state_type"; 
 private static final String STATE_BORDER_RADIUS = "state_border_radius"; 
 
 //屏幕旋转后，取出保存的值 
 @Override 
 protected Parcelable onSaveInstanceState() 
 { 
 Bundle bundle = new Bundle(); 
 bundle.putParcelable(STATE_INSTANCE, super.onSaveInstanceState()); 
 bundle.putInt(STATE_TYPE, type); 
 bundle.putInt(STATE_BORDER_RADIUS, mBorderRadius); 
 return bundle; 
 } 
 
 //屏幕旋转，变量的保存，因为外面设置值，如果不保存，一旋转就变成个xml里面设置的值 
 @Override 
 protected void onRestoreInstanceState(Parcelable state) 
 { 
 if (state instanceof Bundle) 
 { 
  Bundle bundle = (Bundle) state; 
  super.onRestoreInstanceState(((Bundle) state) 
   .getParcelable(STATE_INSTANCE)); 
  this.type = bundle.getInt(STATE_TYPE); 
  this.mBorderRadius = bundle.getInt(STATE_BORDER_RADIUS); 
 } else 
 { 
  super.onRestoreInstanceState(state); 
 } 
 
 } 
 
 //设置矩形圆角幅度后，重新绘制控件 
 public void setBorderRadius(int borderRadius) 
 { 
 int pxVal = dp2px(borderRadius); 
 if (this.mBorderRadius != pxVal) 
 { 
  this.mBorderRadius = pxVal; 
  invalidate(); 
 } 
 } 
 
 //设置是圆形还是矩形圆角 
 public void setType(int type) 
 { 
 if (this.type != type) 
 { 
  this.type = type; 
  if (this.type != TYPE_RECT && this.type != TYPE_CIRCLE) 
  { 
  this.type = TYPE_CIRCLE; 
  } 
  requestLayout(); 
 } 
 
 } 
 
 //dp转px 
 public int dp2px(int dpVal) 
 { 
 return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 
  dpVal, getResources().getDisplayMetrics()); 
 } 
 
}

3、滑动旋转缩放的bimp图片

package com.example.customimage.view; 
 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.Canvas; 
import android.graphics.Matrix; 
import android.graphics.Paint; 
import android.graphics.PaintFlagsDrawFilter; 
import android.graphics.PointF; 
import android.graphics.drawable.BitmapDrawable; 
import android.graphics.drawable.Drawable; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.widget.ImageView; 
 
public class MatrixImageView extends ImageView { 
 private static final int MODE_NONE = 0x00123;// 默认的触摸模式 
 private static final int MODE_DRAG = 0x00321;// 拖拽模式 
 private static final int MODE_ZOOM = 0x00132;// 缩放or旋转模式 
 
 private int mode;// 当前的触摸模式 
 
 private float preMove = 1F;// 上一次手指移动的距离 
 private float saveRotate = 0F;// 保存了的角度值 
 private float rotate = 0F;// 旋转的角度 
 
 private float[] preEventCoor;// 上一次各触摸点的坐标集合 
 
 private PointF startPointF, midPointF;// 起点、中点对象 
 private Matrix currentMatrix, savedMatrix;// 当前和保存了的Matrix对象 
 
 //原始图片 
 private Bitmap mSrc; 
 
 //控件的宽度 
 private int mWidth; 
 
 // 控件的高度 
 private int mHeight; 
 
 private PaintFlagsDrawFilter mDrawFilter; 
 
 public MatrixImageView(Context context, AttributeSet attrs) { 
 super(context, attrs); 
 
 // 初始化 
 init(); 
 } 
 
 /** 
 * 初始化 
 */ 
 private void init() { 
 // 实例化对象 
 
 currentMatrix = new Matrix(); 
 savedMatrix = new Matrix(); 
 startPointF = new PointF(); 
 midPointF = new PointF(); 
 mDrawFilter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG); 
 // 模式初始化 
 mode = MODE_NONE; 
 
 Drawable drawable = getDrawable(); 
 mSrc = drawableToBitamp(drawable); 
  
 } 
 
 /** 
 * 计算控件的高度和宽度 
 */ 
 @Override 
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
 { 
 // 设置宽度 
 int specMode = MeasureSpec.getMode(widthMeasureSpec); 
 int specSize = MeasureSpec.getSize(widthMeasureSpec); 
 
 //match_parent或者设置的精确值获取 
 //MeasureSpec.EXACTLY 
 if (specMode == MeasureSpec.EXACTLY) 
 { 
  mWidth = specSize; 
 } 
 else 
 { 
  // 由图片决定的宽 
  //getPaddingLeft(),getPaddingRight()这两个值是控件属性的向内偏移的距离值，所以的一起计算 
  //区别于layout_marginLeft,两个控件的左间距值设置 
  int desireByImg = getPaddingLeft() + getPaddingRight() 
   + mSrc.getWidth(); 
  
  // wrap_content 
  if (specMode == MeasureSpec.AT_MOST) 
  { 
  //所以最小的值，宽度的话是左右内偏移距离之和 
  mWidth = Math.min(desireByImg, specSize); 
  } else 
 
  mWidth = desireByImg; 
 } 
 
 // 设置高度，部分解释同上 
 specMode = MeasureSpec.getMode(heightMeasureSpec); 
 specSize = MeasureSpec.getSize(heightMeasureSpec); 
  
 //match_parent或者设置的精确值获取 
 //MeasureSpec.EXACTLY 
 if (specMode == MeasureSpec.EXACTLY) 
 { 
  mHeight = specSize; 
 } else 
 { 
  int desire = getPaddingTop() + getPaddingBottom() 
   + mSrc.getHeight(); 
 
  // wrap_content 
  if (specMode == MeasureSpec.AT_MOST) 
  { 
  mHeight = Math.min(desire, specSize); 
  } else 
  mHeight = desire; 
 } 
 
 //计算好的宽度以及高度是值，设置进去 
 setMeasuredDimension(mWidth, mHeight); 
 } 
 
 //drawable转bitmap 
 private Bitmap drawableToBitamp(Drawable drawable) 
 { 
 //从控件的src获取背景，也是drawable文件获取 
 if (drawable instanceof BitmapDrawable) 
 { 
  BitmapDrawable bd = (BitmapDrawable) drawable; 
  return bd.getBitmap(); 
 } 
  
 //如果没有绘图一个，只不过是空白的图片 
 int w = drawable.getIntrinsicWidth(); 
 int h = drawable.getIntrinsicHeight(); 
  
 Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 
 Canvas canvas = new Canvas(bitmap); 
 drawable.setBounds(0, 0, w, h); 
 drawable.draw(canvas); 
 return bitmap; 
 } 
 
 final Paint paint = new Paint(); 
 @Override 
 protected void onDraw(Canvas canvas) { 
 //消除锯齿, 图片旋转后的锯齿消除不成功，实在不行图片边缘加一些白色像素点 
 canvas.setDrawFilter(mDrawFilter); 
 //画经过Matrix变化后的图 
 canvas.drawBitmap(mSrc, currentMatrix, null); 
 } 
 
 @Override 
 public boolean onTouchEvent(MotionEvent event) { 
 switch (event.getAction() & MotionEvent.ACTION_MASK) { 
 case MotionEvent.ACTION_DOWN:// 单点接触屏幕时 
  savedMatrix.set(currentMatrix); 
  startPointF.set(event.getX(), event.getY()); 
  //单点触摸是移动模式 
  mode = MODE_DRAG; 
  preEventCoor = null; 
  break; 
 case MotionEvent.ACTION_POINTER_DOWN:// 第二个点接触屏幕时 
  preMove = calSpacing(event); 
  if (preMove > 10F) { 
  savedMatrix.set(currentMatrix); 
  // 计算两个触摸点的中点坐标 
  calMidPoint(midPointF, event); 
  //两点是旋转或者缩放模式 
  mode = MODE_ZOOM; 
  } 
  preEventCoor = new float[4]; 
  preEventCoor[0] = event.getX(0); 
  preEventCoor[1] = event.getX(1); 
  preEventCoor[2] = event.getY(0); 
  preEventCoor[3] = event.getY(1); 
  saveRotate = calRotation(event); 
  break; 
 case MotionEvent.ACTION_UP:// 单点离开屏幕时 
 case MotionEvent.ACTION_POINTER_UP:// 第二个点离开屏幕时 
  mode = MODE_NONE; 
  preEventCoor = null; 
  break; 
 case MotionEvent.ACTION_MOVE:// 触摸点移动时 
  /* 
  * 单点触控拖拽平移 
  */ 
  if (mode == MODE_DRAG) { 
  currentMatrix.set(savedMatrix); 
  float dx = event.getX() - startPointF.x; 
  float dy = event.getY() - startPointF.y; 
  currentMatrix.postTranslate(dx, dy); 
  } 
  /* 
  * 两点触控拖放旋转 
  */ 
  else if (mode == MODE_ZOOM && event.getPointerCount() == 2) { 
  float currentMove = calSpacing(event); 
  currentMatrix.set(savedMatrix); 
  /* 
   * 指尖移动距离大于10F缩放 
   */ 
  if (currentMove > 10F) { 
   float scale = currentMove / preMove; 
   currentMatrix.postScale(scale, scale, midPointF.x, midPointF.y); 
  } 
  /* 
   * 保持两点时旋转 
   */ 
  if (preEventCoor != null) { 
   rotate = calRotation(event); 
   r = rotate - saveRotate; 
   currentMatrix.postRotate(r, getMeasuredWidth() / 2, getMeasuredHeight() / 2); 
  } 
  } 
  break; 
 } 
 
 setImageMatrix(currentMatrix); 
 return true; 
 } 
 
 float r; 
 
 /** 
 * 计算两个触摸点间的距离 
 */ 
 private float calSpacing(MotionEvent event) { 
 float x = event.getX(0) - event.getX(1); 
 float y = event.getY(0) - event.getY(1); 
 return (float) Math.sqrt(x * x + y * y); 
 } 
 
 /** 
 * 计算两个触摸点的中点坐标 
 */ 
 private void calMidPoint(PointF point, MotionEvent event) { 
 float x = event.getX(0) + event.getX(1); 
 float y = event.getY(0) + event.getY(1); 
 point.set(x / 2, y / 2); 
 } 
 
 /** 
 * 计算旋转角度 
 * 
 * @param 事件对象 
 * @return 角度值 
 */ 
 private float calRotation(MotionEvent event) { 
 double deltaX = (event.getX(0) - event.getX(1)); 
 double deltaY = (event.getY(0) - event.getY(1)); 
 double radius = Math.atan2(deltaY, deltaX); 
 return (float) Math.toDegrees(radius); 
 } 
 
}

4、图片颜色处理（滑动)

package com.example.customimage.view; 
 
import com.example.customimage.R; 
import android.content.Context; 
import android.content.res.TypedArray; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.ColorMatrixColorFilter; 
import android.graphics.Matrix; 
import android.graphics.Paint; 
import android.graphics.PorterDuff.Mode; 
import android.graphics.PorterDuffXfermode; 
import android.graphics.RadialGradient; 
import android.graphics.Shader.TileMode; 
import android.util.AttributeSet; 
import android.view.View; 
 
public class DreamEffectView extends View { 
 private Paint mBitmapPaint, mShaderPaint;// 位图画笔和Shader图形的画笔 
 private PorterDuffXfermode mXfermode;// 图形混合模式 
 private int x, y;// 位图起点坐标 
 //控件的宽度 
 private int mWidth; 
 // 控件的高度 
 private int mHeight; 
 //原始图片 
 private Bitmap mSrc; 
 //生成暗角的图片 
 private Bitmap darkCornerBitmap; 
 public final static int BITMAP_NULL = 0; //原图 
 private final static int BITMAP_DEAST = 1; //去饱和 
 private final static int BITMAP_CENTER = 2; //中心突出 
 private final static int BITMAP_DARKCORNER = 3; //四角黑暗 
 
 private int mnSelectMode = 0; 
 
 public DreamEffectView(Context context, AttributeSet attrs) 
 { 
 this(context, attrs, 0); 
 } 
 
 public DreamEffectView(Context context) 
 { 
 this(context, null); 
 } 
 
 public DreamEffectView(Context context, AttributeSet attrs, int defStyle) { 
 super(context, attrs,defStyle); 
 
 TypedArray a = context.getTheme().obtainStyledAttributes(attrs, 
  R.styleable.DreamEffectView, defStyle, 0); 
  
 int n = a.getIndexCount(); 
 for (int i = 0; i < n; i++) 
 { 
  int attr = a.getIndex(i); 
  switch (attr) 
  { 
  //原始图片，在布局里面获取 
  case R.styleable.DreamEffectView_src: 
  mSrc = BitmapFactory.decodeResource(getResources(), 
   a.getResourceId(attr, 0)); 
  break; 
  case R.styleable.DreamEffectView_mode: 
  mnSelectMode = a.getInt(attr, 0); 
  break; 
  } 
 } 
 a.recycle(); 
  
 // 实例化混合模式 
 mXfermode = new PorterDuffXfermode(Mode.SCREEN); 
 
 // 初始化画笔 
 initPaint(); 
 } 
 
 /** 
 * 计算控件的高度和宽度 
 */ 
 @Override 
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
 { 
 // 设置宽度 
 int specMode = MeasureSpec.getMode(widthMeasureSpec); 
 int specSize = MeasureSpec.getSize(widthMeasureSpec); 
 
 if (specMode == MeasureSpec.EXACTLY) 
 { 
  mWidth = specSize; 
 } 
 else 
 { 
  int desireByImg = getPaddingLeft() + getPaddingRight() 
   + mSrc.getWidth(); 
  
  // wrap_content 
  if (specMode == MeasureSpec.AT_MOST) 
  { 
  //所以最小的值，宽度的话是左右内偏移距离之和 
  mWidth = Math.min(desireByImg, specSize); 
  } else 
 
  mWidth = desireByImg; 
 } 
 
 // 设置高度，部分解释同上 
 specMode = MeasureSpec.getMode(heightMeasureSpec); 
 specSize = MeasureSpec.getSize(heightMeasureSpec); 
  
 if (specMode == MeasureSpec.EXACTLY) 
 { 
  mHeight = specSize; 
 } else 
 { 
  int desire = getPaddingTop() + getPaddingBottom() 
   + mSrc.getHeight(); 
 
  // wrap_content 
  if (specMode == MeasureSpec.AT_MOST) 
  { 
  mHeight = Math.min(desire, specSize); 
  } else 
  mHeight = desire; 
 } 
  
 x = mWidth / 2 - mSrc.getWidth() / 2; 
 y = mHeight / 2 - mSrc.getHeight() / 2; 
 
 //计算好的宽度以及高度是值，设置进去 
 setMeasuredDimension(mWidth, mHeight); 
 } 
 
 /** 
 * 初始化画笔 
 */ 
 private void initPaint() { 
 // 实例化画笔 
 mBitmapPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 
 
 // 实例化Shader图形的画笔 
 mShaderPaint = new Paint(); 
 switch (mnSelectMode) { 
 case BITMAP_NULL: 
  
  break; 
 case BITMAP_DEAST: 
  // 去饱和、提亮、色相矫正 
  mBitmapPaint.setColorFilter(new ColorMatrixColorFilter( 
   new float[] { 0.8587F, 0.2940F, -0.0927F, 0, 6.79F, 0.0821F, 0.9145F, 0.0634F, 0, 6.79F, 
    0.2019F, 0.1097F, 0.7483F, 0, 6.79F, 0, 0, 0, 1, 0 })); 
  
  break; 
 case BITMAP_CENTER: 
  // 去饱和、提亮、色相矫正 
  mBitmapPaint.setColorFilter(new ColorMatrixColorFilter( 
   new float[] { 0.8587F, 0.2940F, -0.0927F, 0, 6.79F, 0.0821F, 0.9145F, 0.0634F, 0, 6.79F, 
    0.2019F, 0.1097F, 0.7483F, 0, 6.79F, 0, 0, 0, 1, 0 })); 
  // 设置径向渐变，渐变中心当然是图片的中心也是屏幕中心，渐变半径我们直接拿图片的高度但是要稍微小一点 
  // 中心颜色为透明而边缘颜色为黑色 
  mShaderPaint.setShader(new RadialGradient(mWidth / 2, mWidth / 2, mSrc.getHeight() * 7 / 8, Color.TRANSPARENT, 
   Color.BLACK, TileMode.CLAMP)); 
  break; 
 case BITMAP_DARKCORNER: 
  // 去饱和、提亮、色相矫正 
  mBitmapPaint.setColorFilter(new ColorMatrixColorFilter( 
   new float[] { 0.8587F, 0.2940F, -0.0927F, 0, 6.79F, 0.0821F, 0.9145F, 0.0634F, 0, 6.79F, 
    0.2019F, 0.1097F, 0.7483F, 0, 6.79F, 0, 0, 0, 1, 0 })); 
  // 根据我们源图的大小生成暗角Bitmap 
  darkCornerBitmap = Bitmap.createBitmap(mSrc.getWidth(), mSrc.getHeight(), Bitmap.Config.ARGB_8888); 
 
  // 将该暗角Bitmap注入Canvas 
  Canvas canvas = new Canvas(darkCornerBitmap); 
 
  // 计算径向渐变半径 
  float radiu = canvas.getHeight() * (2F / 3F); 
 
  // 实例化径向渐变 
  RadialGradient radialGradient = new RadialGradient(canvas.getWidth() / 2F, canvas.getHeight() / 2F, radiu, new int[] { 0, 0, 0xAA000000 }, new float[] { 0F, 0.7F, 1.0F }, TileMode.CLAMP); 
 
  // 实例化一个矩阵 
  Matrix matrix = new Matrix(); 
 
  // 设置矩阵的缩放 
  matrix.setScale(canvas.getWidth() / (radiu * 2F), 1.0F); 
 
  // 设置矩阵的预平移 
  matrix.preTranslate(((radiu * 2F) - canvas.getWidth()) / 2F, 0); 
 
  // 将该矩阵注入径向渐变 
  radialGradient.setLocalMatrix(matrix); 
 
  // 设置画笔Shader 
  mShaderPaint.setShader(radialGradient); 
 
  // 绘制矩形 
  canvas.drawRect(0, 0, canvas.getWidth(), canvas.getHeight(), mShaderPaint); 
  break; 
 default: 
  break; 
 } 
 } 
 
 @Override 
 protected void onDraw(Canvas canvas) { 
 canvas.drawColor(Color.BLACK); 
 
 // 新建图层 
 int sc = canvas.saveLayer(x, y, x + mSrc.getWidth(), y + mSrc.getHeight(), null, Canvas.ALL_SAVE_FLAG); 
 
 // 绘制混合颜色 
 canvas.drawColor(0xcc1c093e); 
 
 // 设置混合模式 
 mBitmapPaint.setXfermode(mXfermode); 
 
 // 绘制位图 
 canvas.drawBitmap(mSrc, x, y, mBitmapPaint); 
 
 // 还原混合模式 
 mBitmapPaint.setXfermode(null); 
 
 // 还原画布 
 canvas.restoreToCount(sc); 
 
 switch (mnSelectMode) { 
 case BITMAP_NULL: 
  
  break; 
 case BITMAP_DEAST: 
  break; 
 case BITMAP_CENTER: 
  // 绘制一个跟图片大小一样的矩形 
  canvas.drawRect(x, y, x + mSrc.getWidth(), y + mSrc.getHeight(),mShaderPaint); 
  break; 
 case BITMAP_DARKCORNER: 
  // 绘制我们画好的径向渐变图 
  canvas.drawBitmap(darkCornerBitmap, x, y, null); 
  break; 
 default: 
  break; 
 } 
 } 
}

1）、实现 去饱和、提亮、色相矫正 效果的部分代码 

mBitmapPaint.setColorFilter(new ColorMatrixColorFilter( 
 new float[] { 0.8587F, 0.2940F, -0.0927F, 0, 6.79F, 0.0821F, 0.9145F, 0.0634F, 0, 6.79F, 
  0.2019F, 0.1097F, 0.7483F, 0, 6.79F, 0, 0, 0, 1, 0 }));

2）、实现中心颜色为透明而边缘颜色为黑色效果的部分代码   

mShaderPaint.setShader(new RadialGradient(mWidth / 2, mWidth / 2, mSrc.getHeight() * 7 / 8, Color.TRANSPARENT, 
 Color.BLACK, TileMode.CLAMP));

3）、实现四角黑暗效果的部分代码

// 根据我们源图的大小生成暗角Bitmap 
darkCornerBitmap = Bitmap.createBitmap(mSrc.getWidth(), mSrc.getHeight(), Bitmap.Config.ARGB_8888); 
 
// 将该暗角Bitmap注入Canvas 
Canvas canvas = new Canvas(darkCornerBitmap); 
 
// 计算径向渐变半径 
float radiu = canvas.getHeight() * (2F / 3F); 
 
// 实例化径向渐变 
RadialGradient radialGradient = new RadialGradient(canvas.getWidth() / 2F, canvas.getHeight() / 2F, radiu, new int[] { 0, 0, 0xAA000000 }, new float[] { 0F, 0.7F, 1.0F }, TileMode.CLAMP); 
 
// 实例化一个矩阵 
Matrix matrix = new Matrix(); 
 
// 设置矩阵的缩放 
matrix.setScale(canvas.getWidth() / (radiu * 2F), 1.0F); 
 
// 设置矩阵的预平移 
matrix.preTranslate(((radiu * 2F) - canvas.getWidth()) / 2F, 0); 
 
// 将该矩阵注入径向渐变 
radialGradient.setLocalMatrix(matrix); 
 
// 设置画笔Shader 
mShaderPaint.setShader(radialGradient); 
 
// 绘制矩形 
canvas.drawRect(0, 0, canvas.getWidth(), canvas.getHeight(), mShaderPaint);

5、图片 + 文字

package com.example.customimage.view; 
 
import com.example.customimage.R; 
 
import android.content.Context; 
import android.content.res.TypedArray; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.PorterDuff; 
import android.graphics.PorterDuffXfermode; 
import android.graphics.RectF; 
import android.graphics.Bitmap.Config; 
import android.graphics.Paint.Style; 
import android.graphics.Rect; 
import android.text.TextPaint; 
import android.text.TextUtils; 
import android.util.AttributeSet; 
import android.util.Log; 
import android.util.TypedValue; 
import android.view.View; 
 
public class ImageViewText extends View{ 
 
 //类型 
 private int type; 
 private static final int TYPE_CIRCLE = 0; //圆形 
 private static final int TYPE_RECT = 1; //矩形圆角 
 //原始图片 
 private Bitmap mImage; 
 //控件的宽度 
 private int mWidth; 
 
 // 控件的高度 
 private int mHeight; 
 
 //矩形圆角的幅度 
 private int mRadius; 
 //图片下面的文字 
 private String mTitle; 
 private int mTextColor; 
 private int mTextSize; 
 private Rect rect; 
 private Paint mPaint; 
 private Rect mTextBound; 
 
 public ImageViewText(Context context, AttributeSet attrs) 
 { 
 this(context, attrs, 0); 
 } 
 
 public ImageViewText(Context context) 
 { 
 this(context, null); 
 } 
 
 /** 
 * 初始化所特有自定义类型 
 * 
 * @param context 
 * @param attrs 
 * @param defStyle 
 */ 
 public ImageViewText(Context context, AttributeSet attrs, int defStyle) 
 { 
 super(context, attrs, defStyle); 
 
 TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.ImageViewText, defStyle, 0); 
 
 int n = a.getIndexCount(); 
 
 for (int i = 0; i < n; i++) 
 { 
  int attr = a.getIndex(i); 
 
  switch (attr) 
  { 
  //获取图片 
  case R.styleable.ImageViewText_image: 
  mImage = BitmapFactory.decodeResource(getResources(), a.getResourceId(attr, 0)); 
  break; 
  //获取圆形还是方形 
  case R.styleable.ImageViewText_type: 
  type = a.getInt(attr, 0); 
  break; 
  //获取文字 
  case R.styleable.ImageViewText_titleText: 
  mTitle = a.getString(attr); 
  break; 
  //获取文字的图片 
  case R.styleable.ImageViewText_titleTextColor: 
  mTextColor = a.getColor(attr, Color.BLACK); 
  break; 
  //获取文字的大小 
  case R.styleable.ImageViewText_titleTextSize: 
  mTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 
   16, getResources().getDisplayMetrics())); 
  break; 
  //矩形圆角幅度的获取，默认是10dp 
  case R.styleable.ImageViewText_borderRadius: 
  mRadius = a.getDimensionPixelSize(attr, (int) TypedValue 
   .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10f, 
    getResources().getDisplayMetrics())); 
  break; 
  } 
 } 
 a.recycle(); 
 rect = new Rect(); 
 mPaint = new Paint(); 
 mTextBound = new Rect(); 
 mPaint.setTextSize(mTextSize); 
 // 计算了描绘字体需要的范围 
 mPaint.getTextBounds(mTitle, 0, mTitle.length(), mTextBound); 
 
 } 
 
 //测量控件的大小 
 @Override 
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
 { 
 
 //设置宽度 
 int specMode = MeasureSpec.getMode(widthMeasureSpec); 
 int specSize = MeasureSpec.getSize(widthMeasureSpec); 
 // match_parent , accurate 大小 
 if (specMode == MeasureSpec.EXACTLY) 
 { 
  mWidth = specSize; 
 } else 
 { 
  // 由图片决定的宽 
  int desireByImg = getPaddingLeft() + getPaddingRight() + mImage.getWidth(); 
  // 由字体决定的宽 
  int desireByTitle = getPaddingLeft() + getPaddingRight() + mTextBound.width(); 
  //wrap_content 大小 
  if (specMode == MeasureSpec.AT_MOST) 
  { 
  //取小的值 
  int desire = Math.max(desireByImg, desireByTitle); 
  mWidth = Math.min(desire, specSize); 
  } 
 } 
 
 //设置高度 
 specMode = MeasureSpec.getMode(heightMeasureSpec); 
 // match_parent , accurate 大小 
 if (specMode == MeasureSpec.EXACTLY) 
 { 
  mHeight = specSize; 
 } else 
 { 
  //wrap_content 大小 
  mHeight = getPaddingTop() + getPaddingBottom() + mImage.getHeight() + mTextBound.height(); 
 } 
 //测量好的大小设置进去 
 setMeasuredDimension(mWidth, mHeight); 
 } 
 
 @Override 
 protected void onDraw(Canvas canvas) 
 { 
 // 边框 
 mPaint.setStrokeWidth(4); 
 mPaint.setStyle(Paint.Style.STROKE); 
 mPaint.setColor(Color.CYAN); 
 canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint); 
 
 mPaint.setColor(mTextColor); 
 mPaint.setStyle(Style.FILL); 
 //当前设置的宽度小于字体需要的宽度，将字体改为 
 //绘制文字 
 if (mTextBound.width() > mWidth) 
 { 
  TextPaint paint = new TextPaint(mPaint); 
  String msg = TextUtils.ellipsize(mTitle, paint, (float) mWidth - getPaddingLeft() - getPaddingRight(), 
   TextUtils.TruncateAt.END).toString(); 
  canvas.drawText(msg, getPaddingLeft(), mHeight - getPaddingBottom(), mPaint); 
 
 } else 
 { 
  //正常情况，将字体居中 
  canvas.drawText(mTitle, mWidth / 2 - mTextBound.width() * 1.0f / 2, mHeight - getPaddingBottom(), mPaint); 
 } 
  
  //计算居中的矩形范围 
  rect.left = mWidth / 2 - mImage.getWidth() / 2 + getPaddingLeft(); 
  rect.right = mWidth / 2 + mImage.getWidth() / 2 + getPaddingRight(); 
  rect.top = (mHeight - mTextBound.height()) / 2 - mImage.getHeight() / 2 + getPaddingTop(); 
  rect.bottom = (mHeight - mTextBound.height()) / 2 + mImage.getHeight() / 2 + getPaddingBottom(); 
  
 switch (type) 
 { 
 // 如果是TYPE_CIRCLE绘制圆形 
 case TYPE_CIRCLE: 
  //圆形宽度和高度应该一致的，所以也要比较一下大小，取小的值 
  int min = Math.min(mWidth, mHeight); 
  // 圆形宽度和高度如果不一致，按小的值进行压缩 
  mImage = Bitmap.createScaledBitmap(mImage, min, min, false); 
  //绘制圆形 
  canvas.drawBitmap(createCircleImage(mImage, min), null, rect, null); 
  break; 
 case TYPE_RECT: 
  canvas.drawBitmap(createRoundConerImage(mImage), null, rect, null); 
  break; 
 
 } 
 } 
 
 /** 
 * 根据原图和变长绘制圆形图片 
 * 
 * @param source 
 * @param min 
 * @return 
 */ 
 private Bitmap createCircleImage(Bitmap source, int min) 
 { 
 final Paint paint = new Paint(); 
 //防止边缘的抗锯齿 
 paint.setAntiAlias(true); 
  
 Bitmap target = Bitmap.createBitmap(min, min, Config.ARGB_8888); 
 // 产生一个同样大小的画布 
 Canvas canvas = new Canvas(target); 
 // 首先绘制圆形,除以2就是半径了 
 //最主要设置第三个参数为min/2，圆角幅度那么大就是圆形了 
 canvas.drawCircle(min / 2, min / 2, min/2, paint); 
 // 使用SRC_IN，参考上面的说明---上下层都显示。下层居上显示 
 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); 
 // 绘制图片 
 canvas.drawBitmap(source, 0, 0, paint); 
 return target; 
 } 
 
 /** 
 * 根据原图添加圆角 
 * 
 * @param source 
 * @return 
 */ 
 private Bitmap createRoundConerImage(Bitmap source) 
 { 
 final Paint paint = new Paint(); 
 paint.setAntiAlias(true); 
 Bitmap target = Bitmap.createBitmap(mWidth, mHeight, Config.ARGB_8888); 
 Canvas canvas = new Canvas(target); 
 //绘制矩形 
 RectF rect = new RectF(0, 0, source.getWidth(), source.getHeight()); 
 //设置圆角幅度 
 canvas.drawRoundRect(rect, mRadius, mRadius, paint); 
 // 使用SRC_IN，参考上面的说明---上下层都显示。下层居上显示 
 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); 
 canvas.drawBitmap(source, 0, 0, paint); 
 return target; 
 } 
}

是不是很全的Android自定义图片集合，希望大家喜欢。

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