android自定义控件ImageView实现圆形图片

概述android开发中常常涉及到一种情况，就是将用户上传的图片以圆形样式显示，但是用户上传的图片可以有直角、圆角、正方形等多种不确定样式，这时就用到了自定义ImageView控件，在安卓客户端使接收到的图片全部以圆形样

androID开发中常常涉及到一种情况，就是将用户上传的图片以圆形样式显示，但是用户上传的图片可以有直角、圆角、正方形等多种不确定样式，这时就用到了自定义ImageVIEw控件，在安卓客户端使接收到的图片全部以圆形样式显示

circleimageVIEw.java

public class circleimageVIEw extends ImageVIEw {  private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;  private static final Bitmap.Config BITMAP_CONfig = Bitmap.Config.ARGB_8888;  private static final int colorDRAWABLE_DIMENSION = 2;  // 圆形边框的厚度默认值。  // 如果是0，则没有天蓝色渐变的边框。  private static final int DEFAulT_border_WIDTH = 0;  private static final int DEFAulT_border_color = color.BLACK; private final RectF mDrawableRect = new RectF();  private final RectF mborderRect = new RectF();  private final Matrix mShaderMatrix = new Matrix();  private final Paint mBitmapPaint = new Paint();  private final Paint mborderPaint = new Paint();  private int mbordercolor = DEFAulT_border_color;  private int mborderWIDth = DEFAulT_border_WIDTH;  private Bitmap mBitmap;  private BitmapShader mBitmapShader;  private int mBitmapWIDth;  private int mBitmapHeight;  private float mDrawableRadius;  private float mborderRadius;  private boolean mReady;  private boolean mSetupPending;  private final Paint mFlagBackgroundPaint = new Paint();  private final TextPaint mFlagTextPaint = new TextPaint();  private String mFlagText;  private boolean mShowFlag = false;  private Rect mFlagTextBounds = new Rect();  Shader mSweepGradIEnt = null;  public circleimageVIEw(Context context) {  super(context);  init();  } public circleimageVIEw(Context context,AttributeSet attrs) {  this(context,attrs,0);  } public circleimageVIEw(Context context,AttributeSet attrs,int defStyle) {  super(context,defStyle);  init();  } private voID init() {  super.setScaleType(SCALE_TYPE);  mReady = true;  if (mSetupPending) {   setup();   mSetupPending = false;  }  } @OverrIDe public ScaleType getScaleType() {  return SCALE_TYPE;  } @OverrIDe public voID setScaleType(ScaleType scaleType) {  if (scaleType != SCALE_TYPE) {   throw new IllegalArgumentException(String.format(    "ScaleType %s not supported.",scaleType));  }  } @OverrIDe public voID setAdjustVIEwBounds(boolean adjustVIEwBounds) {  if (adjustVIEwBounds) {   throw new IllegalArgumentException(    "adjustVIEwBounds not supported.");  }  } @OverrIDe protected voID onDraw(Canvas canvas) {  if (getDrawable() == null) {   return;  }  canvas.drawCircle(getWIDth() / 2,getHeight() / 2,mDrawableRadius,mBitmapPaint);  if (mborderWIDth != 0) {   canvas.save();   canvas.rotate(20,getWIDth() / 2,getHeight() / 2);   canvas.drawCircle(getWIDth() / 2,mborderRadius,mborderPaint);   canvas.restore();  }  if (mShowFlag && mFlagText != null) {   canvas.drawArc(mborderRect,40,100,false,mFlagBackgroundPaint);   mFlagTextPaint.getTextBounds(mFlagText,mFlagText.length(),mFlagTextBounds);   canvas.drawText(mFlagText,(float) ((3 + Math.cos((float) (Math.PI * 5 / 18)))       * getHeight() / 4 + mFlagTextBounds.height() / 3),mFlagTextPaint);  }  } @OverrIDe protected voID onSizeChanged(int w,int h,int olDW,int oldh) {  super.onSizeChanged(w,h,olDW,oldh);  setup();  } public int getbordercolor() {  return mbordercolor;  } public voID setbordercolor(int bordercolor) {  if (bordercolor == mbordercolor) {   return;  } mbordercolor = bordercolor;  mborderPaint.setcolor(mbordercolor);  invalIDate();  } public int getborderWIDth() {  return mborderWIDth;  } /**  * @param borderWIDth  *  圆形的边框厚度。  */ public voID setborderWIDth(int borderWIDth) {  if (borderWIDth == mborderWIDth) {   return;  } mborderWIDth = borderWIDth;  setup();  } @OverrIDe public voID setimageBitmap(Bitmap bm) {  super.setimageBitmap(bm);  mBitmap = bm;  setup();  } @OverrIDe public voID setimageDrawable(Drawable drawable) {  super.setimageDrawable(drawable);  mBitmap = getBitmapFromDrawable(drawable);  setup();  } @OverrIDe public voID setimageResource(int resID) {  super.setimageResource(resID);  mBitmap = getBitmapFromDrawable(getDrawable());  setup();  } @OverrIDe public voID setimageURI(Uri uri) {  super.setimageURI(uri);  mBitmap = getBitmapFromDrawable(getDrawable());  setup();  } private Bitmap getBitmapFromDrawable(Drawable drawable) {  if (drawable == null) {   return null;  } if (drawable instanceof BitmapDrawable) {   return ((BitmapDrawable) drawable).getBitmap();  } try {   Bitmap bitmap;   if (drawable instanceof colorDrawable) {   bitmap = Bitmap.createBitmap(colorDRAWABLE_DIMENSION,colorDRAWABLE_DIMENSION,BITMAP_CONfig);   } else {   bitmap = Bitmap.createBitmap(drawable.getIntrinsicWIDth(),drawable.getIntrinsicHeight(),BITMAP_CONfig);   }  Canvas canvas = new Canvas(bitmap);   drawable.setBounds(0,canvas.getWIDth(),canvas.getHeight());   drawable.draw(canvas);   return bitmap;  } catch (OutOfMemoryError e) {   return null;  }  } private voID setup() {  if (!mReady) {   mSetupPending = true;   return;  } if (mBitmap == null) {   return;  } mBitmapShader = new BitmapShader(mBitmap,Shader.TileMode.CLAMP,Shader.TileMode.CLAMP); mBitmapPaint.setAntiAlias(true);  mBitmapPaint.setShader(mBitmapShader); mborderPaint.setStyle(Paint.Style.stroke);  mborderPaint.setAntiAlias(true);  mborderPaint.setcolor(mbordercolor);  mborderPaint.setstrokeWIDth(mborderWIDth); mBitmapHeight = mBitmap.getHeight();  mBitmapWIDth = mBitmap.getWIDth(); mborderRect.set(0,getWIDth(),getHeight());  mborderRadius = Math.min((mborderRect.height() - mborderWIDth) / 2,(mborderRect.wIDth() - mborderWIDth) / 2); mDrawableRect.set(mborderWIDth,mborderWIDth,mborderRect.wIDth()   - mborderWIDth,mborderRect.height() - mborderWIDth);  mDrawableRadius = Math.min(mDrawableRect.height() / 2,mDrawableRect.wIDth() / 2); mFlagBackgroundPaint.setcolor(color.BLACK & 0x66FFFFFF);  mFlagBackgroundPaint.setFlags(TextPaint.ANTI_AliAS_FLAG); mFlagTextPaint.setFlags(TextPaint.ANTI_AliAS_FLAG);  mFlagTextPaint.setTextAlign(Align.CENTER);  mFlagTextPaint.setcolor(color.WHITE);  mFlagTextPaint   .setTextSize(getResources().getdisplayMetrics().density * 18); mSweepGradIEnt = new SweepGradIEnt(getWIDth() / 2,new int[] { color.rgb(255,255,255),color.rgb(1,209,255) },null); mborderPaint.setShader(mSweepGradIEnt); updateShaderMatrix();  invalIDate();  } private voID updateShaderMatrix() {  float scale;  float dx = 0;  float dy = 0; mShaderMatrix.set(null); if (mBitmapWIDth * mDrawableRect.height() > mDrawableRect.wIDth()   * mBitmapHeight) {   scale = mDrawableRect.height() / (float) mBitmapHeight;   dx = (mDrawableRect.wIDth() - mBitmapWIDth * scale) * 0.5f;  } else {   scale = mDrawableRect.wIDth() / (float) mBitmapWIDth;   dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;  } mShaderMatrix.setScale(scale,scale);  mShaderMatrix.postTranslate((int) (dx + 0.5f) + mborderWIDth,(int) (dy + 0.5f) + mborderWIDth); mBitmapShader.setLocalMatrix(mShaderMatrix);  } public voID setShowFlag(boolean show) {  mShowFlag = show;  invalIDate();  } public voID setFlagText(String text) {  mFlagText = text;  invalIDate();  } }

activity_main.xml

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"  xmlns:app="http://schemas.androID.com/apk/res-auto"  xmlns:tools="http://schemas.androID.com/tools"  androID:layout_wIDth="match_parent"  androID:layout_height="match_parent"  androID:orIEntation="vertical"  >  <com.example.vIEw.circleimageVIEw   androID:layout_wIDth="match_parent"  androID:layout_height="match_parent"/><／linearLayout>

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