圆形头像

package com.bwie.test;


import com.bwie.test.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(200,
200, 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);
}


}