private static final int TYPE_CIRCLE = 0;
private static final int TYPE_ROUND = 1;
/**
* 图片
*/
private Bitmap mSrc;
/**
* 圆角的大小
*/
private int mRadius;
/**
* 控件的宽度
*/
private int mWidth;
/**
* 控件的高度
*/
private int mHeight;
public CustomImageView(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public CustomImageView(Context context)
{
this(context, null);
}
/**
* 初始化一些自定义的参数
*
* @param context
* @param attrs
* @param defStyle
*/
public CustomImageView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomImageView, defStyle, 0);
int n = a.getIndexCount();
for (int i = 0; i < n; i++)
{
int attr = a.getIndex(i);
switch (attr)
{
case R.styleable.CustomImageView_src:
mSrc = BitmapFactory.decodeResource(getResources(), a.getResourceId(attr, 0));
break;
case R.styleable.CustomImageView_type:
type = a.getInt(attr, 0);// 默认为Circle
break;
case R.styleable.CustomImageView_borderRadius:
type = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10f,
getResources().getDisplayMetrics()));// 默认为10DP
break;
}
}
a.recycle();
}
/**
* 计算控件的高度和宽度
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
// super.onMeasure(widthMeasureSpec, heightMeasureSpec);
/**
* 设置宽度
*/
int specMode = MeasureSpec.getMode(widthMeasureSpec);
int specSize = MeasureSpec.getSize(widthMeasureSpec);
if (specMode == MeasureSpec.EXACTLY)// match_parent , accurate
{
mWidth = specSize;
} else
{
// 由图片决定的宽
int desireByImg = getPaddingLeft() + getPaddingRight() + mSrc.getWidth();
if (specMode == MeasureSpec.AT_MOST)// wrap_content
{
mWidth = Math.min(desireByImg, specSize);
}
}
/***
* 设置高度
*/
specMode = MeasureSpec.getMode(heightMeasureSpec);
specSize = MeasureSpec.getSize(heightMeasureSpec);
if (specMode == MeasureSpec.EXACTLY)// match_parent , accurate
{
mHeight = specSize;
} else
{
int desire = getPaddingTop() + getPaddingBottom() + mSrc.getHeight();
if (specMode == MeasureSpec.AT_MOST)// wrap_content
{
mHeight = Math.min(desire, specSize);
}
}
setMeasuredDimension(mWidth, mHeight);
}
/**
* 绘制
*/
@Override
protected void onDraw(Canvas canvas)
{
switch (type)
{
// 如果是TYPE_CIRCLE绘制圆形
case TYPE_CIRCLE:
int min = Math.min(mWidth, mHeight);
/**
* 长度如果不一致,按小的值进行压缩
*/
mSrc = Bitmap.createScaledBitmap(mSrc, min, min, false);
canvas.drawBitmap(createCircleImage(mSrc, min), 0, 0, null);
break;
case TYPE_ROUND:
canvas.drawBitmap(createRoundConerImage(mSrc), 0, 0, null);
break;
}
}
/**
* 根据原图和变长绘制圆形图片
*
* @param source
* @param min
* @return
*/
private Bitmap createCircleImage(Bitmap source, int min)
{
final Paint paint = new Paint();
paint.setAntiAlias(true);
Bitmap target = Bitmap.createBitmap(min, min, Config.ARGB_8888);
/**
* 产生一个同样大小的画布
*/
Canvas canvas = new Canvas(target);
/**
* 首先绘制圆形
*/
canvas.drawCircle(min / 2, min / 2, min / 2, paint);
/**
* 使用SRC_IN,参考上面的说明
*/
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
/**
* 绘制图片
*/
canvas.drawBitmap(source, 0, 0, paint);
return target;
}
/**
* 根据原图添加圆角
*
* @param source
* @return
*/
private Bitmap createRoundConerImage(Bitmap source)
{
final Paint paint = new Paint();
paint.setAntiAlias(true);
Bitmap target = Bitmap.createBitmap(mWidth, mHeight, Config.ARGB_8888);
Canvas canvas = new Canvas(target);
RectF rect = new RectF(0, 0, source.getWidth(), source.getHeight());
canvas.drawRoundRect(rect, 50f, 50f, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(source, 0, 0, paint);
return target;
}
}
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