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[操作系统]自定义圆形控件 RoundImageView


1、自定义圆形控件 RoundImageView

package com.ronye.CustomView;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.graphics.drawable.NinePatchDrawable;import android.util.AttributeSet;import android.widget.ImageView;import com.ronye.R;/** * Created by ${zyj} on 2015/8/27. * 描述: 自定义圆形图片 */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();    }    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 bmp   * @param radius 半径   * @return   */  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(),        Bitmap.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(PorterDuff.Mode.SRC_IN));    canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);    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);  }}

 

2、定义自己的属性配置文件:attr.

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3、在

<LinearLayout    ="http://schemas.android.com/tools"   ="http://schemas.android.com/apk/res-auto"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   android:orientation="horizontal"   >    <!-- 没有指定圆形ImageView属性时,默认没有外边圆颜色 -->   <!-- 需要将图片资源自定为src ,或在程序中setImageResource(res) 不能设置background为图片,这样不能达到圆形效果-->   <com.dxd.roundimageview.RoundImageView     android:layout_width="100dp"     android:layout_height="100dp"     android:src="@drawable/img"     /> 
<!-- border_outside_color 外部圆圈的颜色 --> <!-- border_inside_color 内部部圆圈的颜色 --> <!-- border_thickness 外圆和内圆的宽度 -->
<com.dxd.roundimageview.RoundImageView android:layout_width="100dp" android:layout_height="100dp" android:src="@drawable/img" imagecontrol:border_inside_color="#bc0978" imagecontrol:border_outside_color="#ba3456" imagecontrol:border_thickness="1dp" /> </LinearLayout>

 

4、运行结果