android自定义imageview实现圆角图片

本文实例为大家分享了android自定义imageview实现圆角图片的具体代码，供大家参考，具体内容如下

自定义图片的属性，对图片进行圆角切割

实现效果图：

（1）在activity_main.xml文件布局，非常简单

<?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"
 android:orientation="vertical"
 android:layout_width="match_parent"
 android:layout_height="match_parent">
 <com.example.administrator.testz.CircleImageView
  android:layout_width="160dp"
  android:layout_marginLeft="20dp"
  android:layout_marginTop="20dp"
  android:layout_height="160dp"
  android:layout_centerInParent="true"
  android:src="@mipmap/icon"
  app:civ_border_width="2dp"
  app:civ_border_color="@color/colorAccent" />
</LinearLayout>

2.1注意添加attrs文件，设置图片的属性，然后在java代码中引用属性，在xml文件使用相关属性

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <declare-styleable name="CircleImageView">
  <attr name="civ_border_width" format="dimension" />
  <attr name="civ_border_color" format="color" />
  <attr name="civ_border_overlay" format="boolean" />
  <attr name="civ_fill_color" format="color" />
  <attr name="civ_circle_background_color" format="color" />
 </declare-styleable>
</resources>

（2）MainActivity直接导入上面的布局即可，无需其他操作，如果要写监听或者其他操作，需要特别处理，这里仅仅提供显示

（3）开源的工具类，图片圆角转换工具类

package com.example.administrator.testz;
 
 
 
  import android.content.Context;
  import android.content.res.TypedArray;
  import android.graphics.Bitmap;
  import android.graphics.BitmapShader;
  import android.graphics.Canvas;
  import android.graphics.Color;
  import android.graphics.ColorFilter;
  import android.graphics.Matrix;
  import android.graphics.Outline;
  import android.graphics.Paint;
  import android.graphics.Rect;
  import android.graphics.RectF;
  import android.graphics.Shader;
  import android.graphics.drawable.BitmapDrawable;
  import android.graphics.drawable.ColorDrawable;
  import android.graphics.drawable.Drawable;
  import android.net.Uri;
  import android.os.Build;
  import android.support.annotation.ColorInt;
  import android.support.annotation.ColorRes;
  import android.support.annotation.DrawableRes;
  import android.support.annotation.RequiresApi;
  import android.util.AttributeSet;
  import android.view.MotionEvent;
  import android.view.View;
  import android.view.ViewOutlineProvider;
  import android.widget.ImageView;
 
public class CircleImageView extends ImageView {
 //参考网址:https://html" target="_blank">github.com/hdodenhof/CircleImageView
 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;
 
 private static final int DEFAULT_BORDER_WIDTH = 0;
 private static final int DEFAULT_BORDER_COLOR = Color.BLACK;
 private static final int DEFAULT_CIRCLE_BACKGROUND_COLOR = Color.TRANSPARENT;
 private static final boolean DEFAULT_BORDER_OVERLAY = false;
 
 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 final Paint mCircleBackgroundPaint = new Paint();
 
 private int mBorderColor = DEFAULT_BORDER_COLOR;
 private int mBorderWidth = DEFAULT_BORDER_WIDTH;
 private int mCircleBackgroundColor = DEFAULT_CIRCLE_BACKGROUND_COLOR;
 
 private Bitmap mBitmap;
 private BitmapShader mBitmapShader;
 private int mBitmapWidth;
 private int mBitmapHeight;
 
 private float mDrawableRadius;
 private float mBorderRadius;
 
 private ColorFilter mColorFilter;
 
 private boolean mReady;
 private boolean mSetupPending;
 private boolean mBorderOverlay;
 private boolean mDisableCircularTransformation;
 
 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, attrs, defStyle);
 
  TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);
 
  mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_civ_border_width, DEFAULT_BORDER_WIDTH);
  mBorderColor = a.getColor(R.styleable.CircleImageView_civ_border_color, DEFAULT_BORDER_COLOR);
  mBorderOverlay = a.getBoolean(R.styleable.CircleImageView_civ_border_overlay, DEFAULT_BORDER_OVERLAY);
 
  // Look for deprecated civ_fill_color if civ_circle_background_color is not set
  if (a.hasValue(R.styleable.CircleImageView_civ_circle_background_color)) {
   mCircleBackgroundColor = a.getColor(R.styleable.CircleImageView_civ_circle_background_color,
     DEFAULT_CIRCLE_BACKGROUND_COLOR);
  } else if (a.hasValue(R.styleable.CircleImageView_civ_fill_color)) {
   mCircleBackgroundColor = a.getColor(R.styleable.CircleImageView_civ_fill_color,
     DEFAULT_CIRCLE_BACKGROUND_COLOR);
  }
 
  a.recycle();
 
  init();
 }
 
 private void init() {
  super.setScaleType(SCALE_TYPE);
  mReady = true;
 
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
   setOutlineProvider(new OutlineProvider());
  }
 
  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 (mDisableCircularTransformation) {
   super.onDraw(canvas);
   return;
  }
 
  if (mBitmap == null) {
   return;
  }
 
  if (mCircleBackgroundColor != Color.TRANSPARENT) {
   canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mCircleBackgroundPaint);
  }
  canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mBitmapPaint);
  if (mBorderWidth > 0) {
   canvas.drawCircle(mBorderRect.centerX(), mBorderRect.centerY(), mBorderRadius, mBorderPaint);
  }
 }
 
 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  setup();
 }
 
 @Override
 public void setPadding(int left, int top, int right, int bottom) {
  super.setPadding(left, top, right, bottom);
  setup();
 }
 
 @Override
 public void setPaddingRelative(int start, int top, int end, int bottom) {
  super.setPaddingRelative(start, top, end, bottom);
  setup();
 }
 
 public int getBorderColor() {
  return mBorderColor;
 }
 
 public void setBorderColor(@ColorInt int borderColor) {
  if (borderColor == mBorderColor) {
   return;
  }
 
  mBorderColor = borderColor;
  mBorderPaint.setColor(mBorderColor);
  invalidate();
 }
 
 /**
  * @deprecated Use {@link #setBorderColor(int)} instead
  */
 @Deprecated
 public void setBorderColorResource(@ColorRes int borderColorRes) {
  setBorderColor(getContext().getResources().getColor(borderColorRes));
 }
 
 public int getCircleBackgroundColor() {
  return mCircleBackgroundColor;
 }
 
 public void setCircleBackgroundColor(@ColorInt int circleBackgroundColor) {
  if (circleBackgroundColor == mCircleBackgroundColor) {
   return;
  }
 
  mCircleBackgroundColor = circleBackgroundColor;
  mCircleBackgroundPaint.setColor(circleBackgroundColor);
  invalidate();
 }
 
 public void setCircleBackgroundColorResource(@ColorRes int circleBackgroundRes) {
  setCircleBackgroundColor(getContext().getResources().getColor(circleBackgroundRes));
 }
 
 /**
  * Return the color drawn behind the circle-shaped drawable.
  *
  * @return The color drawn behind the drawable
  *
  * @deprecated Use {@link #getCircleBackgroundColor()} instead.
  */
 @Deprecated
 public int getFillColor() {
  return getCircleBackgroundColor();
 }
 
 /**
  * Set a color to be drawn behind the circle-shaped drawable. Note that
  * this has no effect if the drawable is opaque or no drawable is set.
  *
  * @param fillColor The color to be drawn behind the drawable
  *
  * @deprecated Use {@link #setCircleBackgroundColor(int)} instead.
  */
 @Deprecated
 public void setFillColor(@ColorInt int fillColor) {
  setCircleBackgroundColor(fillColor);
 }
 
 /**
  * Set a color to be drawn behind the circle-shaped drawable. Note that
  * this has no effect if the drawable is opaque or no drawable is set.
  *
  * @param fillColorRes The color resource to be resolved to a color and
  *      drawn behind the drawable
  *
  * @deprecated Use {@link #setCircleBackgroundColorResource(int)} instead.
  */
 @Deprecated
 public void setFillColorResource(@ColorRes int fillColorRes) {
  setCircleBackgroundColorResource(fillColorRes);
 }
 
 public int getBorderWidth() {
  return mBorderWidth;
 }
 
 public void setBorderWidth(int borderWidth) {
  if (borderWidth == mBorderWidth) {
   return;
  }
 
  mBorderWidth = borderWidth;
  setup();
 }
 
 public boolean isBorderOverlay() {
  return mBorderOverlay;
 }
 
 public void setBorderOverlay(boolean borderOverlay) {
  if (borderOverlay == mBorderOverlay) {
   return;
  }
 
  mBorderOverlay = borderOverlay;
  setup();
 }
 
 public boolean isDisableCircularTransformation() {
  return mDisableCircularTransformation;
 }
 
 public void setDisableCircularTransformation(boolean disableCircularTransformation) {
  if (mDisableCircularTransformation == disableCircularTransformation) {
   return;
  }
 
  mDisableCircularTransformation = disableCircularTransformation;
  initializeBitmap();
 }
 
 @Override
 public void setImageBitmap(Bitmap bm) {
  super.setImageBitmap(bm);
  initializeBitmap();
 }
 
 @Override
 public void setImageDrawable(Drawable drawable) {
  super.setImageDrawable(drawable);
  initializeBitmap();
 }
 
 @Override
 public void setImageResource(@DrawableRes int resId) {
  super.setImageResource(resId);
  initializeBitmap();
 }
 
 @Override
 public void setImageURI(Uri uri) {
  super.setImageURI(uri);
  initializeBitmap();
 }
 
 @Override
 public void setColorFilter(ColorFilter cf) {
  if (cf == mColorFilter) {
   return;
  }
 
  mColorFilter = cf;
  applyColorFilter();
  invalidate();
 }
 
 @Override
 public ColorFilter getColorFilter() {
  return mColorFilter;
 }
 
 private void applyColorFilter() {
  if (mBitmapPaint != null) {
   mBitmapPaint.setColorFilter(mColorFilter);
  }
 }
 
 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, 0, canvas.getWidth(), canvas.getHeight());
   drawable.draw(canvas);
   return bitmap;
  } catch (Exception e) {
   e.printStackTrace();
   return null;
  }
 }
 
 private void initializeBitmap() {
  if (mDisableCircularTransformation) {
   mBitmap = null;
  } else {
   mBitmap = getBitmapFromDrawable(getDrawable());
  }
  setup();
 }
 
 private void setup() {
  if (!mReady) {
   mSetupPending = true;
   return;
  }
 
  if (getWidth() == 0 && getHeight() == 0) {
   return;
  }
 
  if (mBitmap == null) {
   invalidate();
   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);
 
  mCircleBackgroundPaint.setStyle(Paint.Style.FILL);
  mCircleBackgroundPaint.setAntiAlias(true);
  mCircleBackgroundPaint.setColor(mCircleBackgroundColor);
 
  mBitmapHeight = mBitmap.getHeight();
  mBitmapWidth = mBitmap.getWidth();
 
  mBorderRect.set(calculateBounds());
  mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2.0f, (mBorderRect.width() - mBorderWidth) / 2.0f);
 
  mDrawableRect.set(mBorderRect);
  if (!mBorderOverlay && mBorderWidth > 0) {
   mDrawableRect.inset(mBorderWidth - 1.0f, mBorderWidth - 1.0f);
  }
  mDrawableRadius = Math.min(mDrawableRect.height() / 2.0f, mDrawableRect.width() / 2.0f);
 
  applyColorFilter();
  updateShaderMatrix();
  invalidate();
 }
 
 private RectF calculateBounds() {
  int availableWidth = getWidth() - getPaddingLeft() - getPaddingRight();
  int availableHeight = getHeight() - getPaddingTop() - getPaddingBottom();
 
  int sideLength = Math.min(availableWidth, availableHeight);
 
  float left = getPaddingLeft() + (availableWidth - sideLength) / 2f;
  float top = getPaddingTop() + (availableHeight - sideLength) / 2f;
 
  return new RectF(left, top, left + sideLength, top + sideLength);
 }
 
 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) + mDrawableRect.left, (int) (dy + 0.5f) + mDrawableRect.top);
 
  mBitmapShader.setLocalMatrix(mShaderMatrix);
 }
 
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  return inTouchableArea(event.getX(), event.getY()) && super.onTouchEvent(event);
 }
 
 private boolean inTouchableArea(float x, float y) {
  return Math.pow(x - mBorderRect.centerX(), 2) + Math.pow(y - mBorderRect.centerY(), 2) <= Math.pow(mBorderRadius, 2);
 }
 
 @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
 private class OutlineProvider extends ViewOutlineProvider {
 
  @Override
  public void getOutline(View view, Outline outline) {
   Rect bounds = new Rect();
   mBorderRect.roundOut(bounds);
   outline.setRoundRect(bounds, bounds.width() / 2.0f);
  }
 
 }
 
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持小牛知识库。