這幾天做項目，有些地方的圖片需要用到圓形圖片，所以百度了一下，在github上找到一個開源項目，處理很簡單，效果如下：

使用起來特別簡單，一共三步，具體如下：

1、創建一個Java類CircleImageView把下面的代碼復制過去，報錯的導包

package de.hdodenhof.circleimageview;

import edu.njupt.zhb.main.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.Color;

import android.graphics.Matrix;

import android.graphics.Paint;

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.util.AttributeSet;

import android.widget.ImageView;

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 = 1;

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;

public CircleImageView(Context context) {

super(context);

}

public CircleImageView(Context context, AttributeSet attrs) {

this(context, attrs, 0);

}

public CircleImageView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

super.setScaleType(SCALE_TYPE);

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);

mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH);

mBorderColor = a.getColor(R.styleable.CircleImageView_border_color, DEFAULT_BORDER_COLOR);

a.recycle();

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

protected void onDraw(Canvas canvas) {

if (getDrawable() == null) {

return;

}

canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);

canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);

}

@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;

}

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();

}

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 (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, 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);

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);

}

}

2、在values文件夾下面創建一個xlm文件attrs.xml把下面的代碼復制進去

3、接下來就是使用了，直接在布局文件中使用，具體使用如下：

直接創建一個自定義的CircleImageView?? src屬性設置你要改變成圓形的圖片

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="#ff00ff"

>

android:id="@+id/imageview"

android:layout_width="100dp"

android:layout_height="100dp"

android:layout_centerInParent="true"

android:src="@drawable/control_image"

/>

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