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://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);
 }

}

}

来源：https://blog.csdn.net/cf8833/article/details/82760692