您好，根据您的需要使用以下代码。我们为您的 CirculerImageView 编写了课程。
<com.widgets.CircularImageView
android:id="@+id/profile_image"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/shape_image"
android:contentDescription="@string/text_app_name"
android:scaleType="fitXY"
android:src="@drawable/profile_img" />
public class CircularImageView extends ImageView {
/** The border width. */
private int borderWidth;
/** The canvas size. */
private int canvasSize;
/** The image. */
private Bitmap image;
/** The paint. */
private Paint paint;
/** The paint border. */
private Paint paintBorder;
/**
* Instantiates a new circular image view.
*
* @param context
* the context
*/
public CircularImageView(final Context context) {
this(context, null);
}
/**
* Instantiates a new circular image view.
*
* @param context
* the context
* @param attrs
* the attrs
*/
public CircularImageView(Context context, AttributeSet attrs) {
this(context, attrs, R.attr.circularImageViewStyle);
}
/**
* Instantiates a new circular image view.
*
* @param context
* the context
* @param attrs
* the attrs
* @param defStyle
* the def style
*/
public CircularImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
paint = new Paint();
paint.setAntiAlias(true);
paintBorder = new Paint();
paintBorder.setAntiAlias(true);
TypedArray attributes = context.obtainStyledAttributes(attrs,
R.styleable.CircularImageView, defStyle, 0);
if (attributes.getBoolean(R.styleable.CircularImageView_border, true)) {
setBorderWidth(attributes.getDimensionPixelOffset(
R.styleable.CircularImageView_border_width, 0));
setBorderColor(attributes.getColor(
R.styleable.CircularImageView_border_color, Color.WHITE));
}
}
/**
* Sets the border width.
*
* @param borderWidth
* the new border width
*/
public void setBorderWidth(int borderWidth) {
this.borderWidth = borderWidth;
this.requestLayout();
this.invalidate();
}
/**
* Sets the border color.
*
* @param borderColor
* the new border color
*/
public void setBorderColor(int borderColor) {
if (paintBorder != null)
paintBorder.setColor(borderColor);
this.invalidate();
}
/**
* Adds the shadow.
*/
public void addShadow() {
setLayerType(LAYER_TYPE_SOFTWARE, paintBorder);
paintBorder.setShadowLayer(4.0f, 0.0f, 2.0f, Color.BLACK);
}
/*
* (non-Javadoc)
*
* @see android.widget.ImageView#onDraw(android.graphics.Canvas)
*/
@SuppressLint("DrawAllocation")
@Override
public void onDraw(Canvas canvas) {
// load the bitmap
image = drawableToBitmap(getDrawable());
// init shader
if (image != null) {
canvasSize = canvas.getWidth();
if (canvas.getHeight() < canvasSize)
canvasSize = canvas.getHeight();
BitmapShader shader = new BitmapShader(Bitmap.createScaledBitmap(
image, canvasSize, canvasSize, false),
Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
paint.setShader(shader);
int circleCenter = (canvasSize - (borderWidth * 2)) / 2;
canvas.drawCircle(circleCenter + borderWidth, circleCenter
+ borderWidth, ((canvasSize - (borderWidth * 2)) / 2)
+ borderWidth - 4.0f, paintBorder);
canvas.drawCircle(circleCenter + borderWidth, circleCenter
+ borderWidth,
((canvasSize - (borderWidth * 2)) / 2) - 4.0f, paint);
}
}
/*
* (non-Javadoc)
*
* @see android.widget.ImageView#onMeasure(int, int)
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = measureWidth(widthMeasureSpec);
int height = measureHeight(heightMeasureSpec);
setMeasuredDimension(width, height);
}
/**
* Measure width.
*
* @param measureSpec
* the measure spec
* @return the int
*/
private int measureWidth(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY) {
result = specSize;
} else if (specMode == MeasureSpec.AT_MOST) {
result = specSize;
} else {
result = canvasSize;
}
return result;
}
/**
* Measure height.
*
* @param measureSpecHeight
* the measure spec height
* @return the int
*/
private int measureHeight(int measureSpecHeight) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpecHeight);
int specSize = MeasureSpec.getSize(measureSpecHeight);
if (specMode == MeasureSpec.EXACTLY) {
result = specSize;
} else if (specMode == MeasureSpec.AT_MOST) {
result = specSize;
} else {
result = canvasSize;
}
return (result + 2);
}
/**
* Drawable to bitmap.
*
* @param drawable
* the drawable
* @return the bitmap
*/
public Bitmap drawableToBitmap(Drawable drawable) {
if (drawable == null) {
return null;
} else if (drawable instanceof BitmapDrawable) {
return ((BitmapDrawable) drawable).getBitmap();
}
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
}
attrs.xml（将其添加到 values 文件夹中）
<resources>
<declare-styleable name="CircularImageView">
<attr name="border" format="boolean"></attr>
<attr name="border_width" format="dimension"></attr>
<attr name="border_color" format="color"></attr>
<attr name="shadow" format="boolean"></attr>
</declare-styleable>
<declare-styleable name="Theme">
<attr name="circularImageViewStyle" format="reference"></attr>
</declare-styleable>
</resources>