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签到天数: 15 天 [LV.4]偶尔看看III
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Android自定义圆形图片,可设置最多两个的外边框。包括从网络获取图片显示。
解决图片锯齿问题。
解决图片变形问题。
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原始图片:
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核心代码:
- /**
- * 圆形ImageView,可设置最多两个宽度不同且颜色不同的圆形边框。
- *
- * @author Alan
- */
- public class RoundImageView extends ImageView {
- private int mBorderThickness = 0;
- private Context mContext;
- private int defaultColor = 0xFFFFFFFF;
- // 如果只有其中一个有值,则只画一个圆形边框
- private int mBorderOutsideColor = 0;
- private int mBorderInsideColor = 0;
- // 控件默认长、宽
- private int defaultWidth = 0;
- private int defaultHeight = 0;
- public RoundImageView(Context context) {
- super(context);
- mContext = context;
- }
- public RoundImageView(Context context, AttributeSet attrs) {
- super(context, attrs);
- mContext = context;
- setCustomAttributes(attrs);
- }
- public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
- super(context, attrs, defStyle);
- mContext = context;
- setCustomAttributes(attrs);
- }
- private void setCustomAttributes(AttributeSet attrs) {
- TypedArray a = mContext.obtainStyledAttributes(attrs,
- R.styleable.roundedimageview);
- mBorderThickness = a.getDimensionPixelSize(
- R.styleable.roundedimageview_border_thickness, 0);
- mBorderOutsideColor = a
- .getColor(R.styleable.roundedimageview_border_outside_color,
- defaultColor);
- mBorderInsideColor = a.getColor(
- R.styleable.roundedimageview_border_inside_color, defaultColor);
- }
- @Override
- protected void onDraw(Canvas canvas) {
- Drawable drawable = getDrawable();
- if (drawable == null) {
- return;
- }
- if (getWidth() == 0 || getHeight() == 0) {
- return;
- }
- this.measure(0, 0);
- if (drawable.getClass() == NinePatchDrawable.class)
- return;
- Bitmap b = ((BitmapDrawable) drawable).getBitmap();
- Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
- if (defaultWidth == 0) {
- defaultWidth = getWidth();
- }
- if (defaultHeight == 0) {
- defaultHeight = getHeight();
- }
- // 保证重新读取图片后不会因为图片大小而改变控件宽、高的大小(针对宽、高为wrap_content布局的imageview,但会导致margin无效)
- // if (defaultWidth != 0 && defaultHeight != 0) {
- // LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
- // defaultWidth, defaultHeight);
- // setLayoutParams(params);
- // }
- int radius = 0;
- if (mBorderInsideColor != defaultColor
- && mBorderOutsideColor != defaultColor) {// 定义画两个边框,分别为外圆边框和内圆边框
- radius = (defaultWidth < defaultHeight ? defaultWidth
- : defaultHeight) / 2 - 2 * mBorderThickness;
- // 画内圆
- drawCircleBorder(canvas, radius + mBorderThickness / 2,
- mBorderInsideColor);
- // 画外圆
- drawCircleBorder(canvas, radius + mBorderThickness
- + mBorderThickness / 2, mBorderOutsideColor);
- } else if (mBorderInsideColor != defaultColor
- && mBorderOutsideColor == defaultColor) {// 定义画一个边框
- radius = (defaultWidth < defaultHeight ? defaultWidth
- : defaultHeight) / 2 - mBorderThickness;
- drawCircleBorder(canvas, radius + mBorderThickness / 2,
- mBorderInsideColor);
- } else if (mBorderInsideColor == defaultColor
- && mBorderOutsideColor != defaultColor) {// 定义画一个边框
- radius = (defaultWidth < defaultHeight ? defaultWidth
- : defaultHeight) / 2 - mBorderThickness;
- drawCircleBorder(canvas, radius + mBorderThickness / 2,
- mBorderOutsideColor);
- } else {// 没有边框
- radius = (defaultWidth < defaultHeight ? defaultWidth
- : defaultHeight) / 2;
- }
- Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);
- canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight
- / 2 - radius, null);
- }
- /**
- * 获取裁剪后的圆形图片
- *
- * @param radius
- * 半径
- */
- public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {
- Bitmap scaledSrcBmp;
- int diameter = radius * 2;
- // 为了防止宽高不相等,造成圆形图片变形,因此截取长方形中处于中间位置最大的正方形图片
- int bmpWidth = bmp.getWidth();
- int bmpHeight = bmp.getHeight();
- int squareWidth = 0, squareHeight = 0;
- int x = 0, y = 0;
- Bitmap squareBitmap;
- if (bmpHeight > bmpWidth) {// 高大于宽
- squareWidth = squareHeight = bmpWidth;
- x = 0;
- y = (bmpHeight - bmpWidth) / 2;
- // 截取正方形图片
- squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
- squareHeight);
- } else if (bmpHeight < bmpWidth) {// 宽大于高
- squareWidth = squareHeight = bmpHeight;
- x = (bmpWidth - bmpHeight) / 2;
- y = 0;
- squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
- squareHeight);
- } else {
- squareBitmap = bmp;
- }
- if (squareBitmap.getWidth() != diameter
- || squareBitmap.getHeight() != diameter) {
- scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
- diameter, true);
- } else {
- scaledSrcBmp = squareBitmap;
- }
- Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
- scaledSrcBmp.getHeight(), Config.ARGB_8888);
- Canvas canvas = new Canvas(output);
- Paint paint = new Paint();
- Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
- scaledSrcBmp.getHeight());
- paint.setAntiAlias(true);
- paint.setFilterBitmap(true);
- paint.setDither(true);
- canvas.drawARGB(0, 0, 0, 0);
- canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
- scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,
- paint);
- paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
- canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
- // bitmap回收(recycle导致在布局文件XML看不到效果)
- // bmp.recycle();
- // squareBitmap.recycle();
- // scaledSrcBmp.recycle();
- bmp = null;
- squareBitmap = null;
- scaledSrcBmp = null;
- return output;
- }
- /**
- * 边缘画圆
- */
- private void drawCircleBorder(Canvas canvas, int radius, int color) {
- Paint paint = new Paint();
- /* 去锯齿 */
- paint.setAntiAlias(true);
- paint.setFilterBitmap(true);
- paint.setDither(true);
- paint.setColor(color);
- /* 设置paint的 style 为STROKE:空心 */
- paint.setStyle(Paint.Style.STROKE);
- /* 设置paint的外框宽度 */
- paint.setStrokeWidth(mBorderThickness);
- canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);
- }
- }
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布局文件:
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://schemas.android.com/tools"
- xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:background="#fffffdfa"
- android:orientation="vertical"
- android:paddingBottom="@dimen/activity_vertical_margin"
- android:paddingLeft="@dimen/activity_vertical_margin"
- android:paddingRight="@dimen/activity_vertical_margin"
- android:paddingTop="@dimen/activity_vertical_margin"
- tools:context=".MainActivity" >
- <LinearLayout
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:orientation="horizontal" >
- <com.alan.roundimageview.RoundImageView
- android:id="@+id/roundImage_network"
- android:layout_width="60dp"
- android:layout_height="60dp"
- android:src="@drawable/default_portrait" />
- <com.alan.roundimageview.RoundImageView
- android:id="@+id/roundImage_one_border"
- android:layout_width="80dp"
- android:layout_height="80dp"
- android:layout_marginLeft="10dp"
- android:layout_marginRight="10dp"
- imagecontrol:border_outside_color="#FFFF0000"
- imagecontrol:border_thickness="2dp"
- android:src="@drawable/default_portrait" />
- <com.alan.roundimageview.RoundImageView
- android:id="@+id/roundImage_two_border"
- android:layout_width="120dp"
- android:layout_height="120dp"
- android:scaleType="centerCrop"
- imagecontrol:border_inside_color="#fff7f2e9"
- imagecontrol:border_outside_color="#ffd5d1c8"
- imagecontrol:border_thickness="2dp"
- android:src="@drawable/default_portrait"/>
- </LinearLayout>
- <LinearLayout
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:layout_marginTop="10dp"
- android:orientation="horizontal" >
- <com.alan.roundimageview.RoundImageView
- android:layout_width="60dp"
- android:layout_height="60dp"
- android:src="@drawable/default_portrait" />
- <com.alan.roundimageview.RoundImageView
- android:layout_width="80dp"
- android:layout_height="80dp"
- android:layout_marginLeft="10dp"
- android:layout_marginRight="10dp"
- imagecontrol:border_outside_color="#FFFF0000"
- imagecontrol:border_thickness="2dp"
- android:src="@drawable/default_portrait"/>
- <com.alan.roundimageview.RoundImageView
- android:layout_width="120dp"
- android:layout_height="120dp"
- android:scaleType="centerCrop"
- imagecontrol:border_inside_color="#fff7f2e9"
- imagecontrol:border_outside_color="#ffd5d1c8"
- imagecontrol:border_thickness="2dp"
- android:src="@drawable/default_portrait" />
- </LinearLayout>
- </LinearLayout>
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源代码下载
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