圆角ImageView的几种实现方法

①自定义View

import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.support.v7.widget.AppCompatImageView;import android.util.AttributeSet;import android.util.TypedValue;/** * 自定义的圆角矩形ImageView，可以直接当组件在布局中使用。 */public class RoundImageView extends AppCompatImageView{    private Paint paint;    private int pxRadius;    public RoundImageView(Context context) {        this(context,null);      }      public RoundImageView(Context context, AttributeSet attrs) {        this(context, attrs,0);    }      public RoundImageView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundImageView);        float dpRadius = typedArray.getDimension(R.styleable.RoundImageView_radius, 0);        pxRadius = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpRadius, context.getResources().getDisplayMetrics());        typedArray.recycle();        paint  = new Paint();    }      /**     * 绘制圆角矩形图片     */    @Override      protected void onDraw(Canvas canvas) {        Drawable drawable = getDrawable();          if (null != drawable) {              Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();              Bitmap b = getRoundBitmap(bitmap, pxRadius);            final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight());              final Rect rectDest = new Rect(0,0,getWidth(),getHeight());            paint.reset();              canvas.drawBitmap(b, rectSrc, rectDest, paint);          } else {              super.onDraw(canvas);          }      }      /**     * 获取圆角矩形图片方法     * @param bitmap     * @param roundPx,一般设置成14     * @return Bitmap     */    private Bitmap getRoundBitmap(Bitmap bitmap, int roundPx) {          Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),                  bitmap.getHeight(), Config.ARGB_8888);          Canvas canvas = new Canvas(output);          final int color = 0xff424242;        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());          final RectF rectF = new RectF(rect);        paint.setAntiAlias(true);          canvas.drawARGB(0, 0, 0, 0);          paint.setColor(color);          int x = bitmap.getWidth();         canvas.drawRoundRect(rectF, roundPx, roundPx, paint);        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));          canvas.drawBitmap(bitmap, rect, rect, paint);          return output;    }  }

②使用Glide等第三方框架：

private RequestOptions requestOptions = RequestOptions.circleCropTransform();...Glide.with(mContext).load(R.mipmap.dialer_dial).apply(requestOptions).into(mContactHolder.civ_contact);

③Glide实现方法二

import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapShader;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.RectF;import android.graphics.Shader;import android.support.annotation.NonNull;import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;import java.security.MessageDigest;public class RoundedCornersTransformation extends BitmapTransformation {  private static final int VERSION = 1;  private static final String ID = "jp.wasabeef.glide.transformations.RoundedCornersTransformation." + VERSION;  public enum CornerType {    ALL,    TOP_LEFT, TOP_RIGHT, BOTTOM_LEFT, BOTTOM_RIGHT,    TOP, BOTTOM, LEFT, RIGHT,    OTHER_TOP_LEFT, OTHER_TOP_RIGHT, OTHER_BOTTOM_LEFT, OTHER_BOTTOM_RIGHT,    DIAGONAL_FROM_TOP_LEFT, DIAGONAL_FROM_TOP_RIGHT  }  private int radius;  private int diameter;  private int margin;  private CornerType cornerType;  public RoundedCornersTransformation(int radius, int margin) {    this(radius, margin, CornerType.ALL);  }  public RoundedCornersTransformation(int radius, int margin, CornerType cornerType) {    this.radius = radius;    this.diameter = this.radius * 2;    this.margin = margin;    this.cornerType = cornerType;  }  @Override protected Bitmap transform(@NonNull BitmapPool pool,      @NonNull Bitmap toTransform, int outWidth, int outHeight) {    int width = toTransform.getWidth();    int height = toTransform.getHeight();    Bitmap bitmap = pool.get(width, height, Bitmap.Config.ARGB_8888);    bitmap.setHasAlpha(true);    Canvas canvas = new Canvas(bitmap);    Paint paint = new Paint();    paint.setAntiAlias(true);    paint.setShader(new BitmapShader(toTransform, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));    drawRoundRect(canvas, paint, width, height);    return bitmap;  }  private void drawRoundRect(Canvas canvas, Paint paint, float width, float height) {    float right = width - margin;    float bottom = height - margin;    switch (cornerType) {      case ALL:        canvas.drawRoundRect(new RectF(margin, margin, right, bottom), radius, radius, paint);        break;      case TOP_LEFT:        drawTopLeftRoundRect(canvas, paint, right, bottom);        break;      case TOP_RIGHT:        drawTopRightRoundRect(canvas, paint, right, bottom);        break;      case BOTTOM_LEFT:        drawBottomLeftRoundRect(canvas, paint, right, bottom);        break;      case BOTTOM_RIGHT:        drawBottomRightRoundRect(canvas, paint, right, bottom);        break;      case TOP:        drawTopRoundRect(canvas, paint, right, bottom);        break;      case BOTTOM:        drawBottomRoundRect(canvas, paint, right, bottom);        break;      case LEFT:        drawLeftRoundRect(canvas, paint, right, bottom);        break;      case RIGHT:        drawRightRoundRect(canvas, paint, right, bottom);        break;      case OTHER_TOP_LEFT:        drawOtherTopLeftRoundRect(canvas, paint, right, bottom);        break;      case OTHER_TOP_RIGHT:        drawOtherTopRightRoundRect(canvas, paint, right, bottom);        break;      case OTHER_BOTTOM_LEFT:        drawOtherBottomLeftRoundRect(canvas, paint, right, bottom);        break;      case OTHER_BOTTOM_RIGHT:        drawOtherBottomRightRoundRect(canvas, paint, right, bottom);        break;      case DIAGONAL_FROM_TOP_LEFT:        drawDiagonalFromTopLeftRoundRect(canvas, paint, right, bottom);        break;      case DIAGONAL_FROM_TOP_RIGHT:        drawDiagonalFromTopRightRoundRect(canvas, paint, right, bottom);        break;      default:        canvas.drawRoundRect(new RectF(margin, margin, right, bottom), radius, radius, paint);        break;    }  }  private void drawTopLeftRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(margin, margin, margin + diameter, margin + diameter), radius,        radius, paint);    canvas.drawRect(new RectF(margin, margin + radius, margin + radius, bottom), paint);    canvas.drawRect(new RectF(margin + radius, margin, right, bottom), paint);  }  private void drawTopRightRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(right - diameter, margin, right, margin + diameter), radius,        radius, paint);    canvas.drawRect(new RectF(margin, margin, right - radius, bottom), paint);    canvas.drawRect(new RectF(right - radius, margin + radius, right, bottom), paint);  }  private void drawBottomLeftRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(margin, bottom - diameter, margin + diameter, bottom), radius,        radius, paint);    canvas.drawRect(new RectF(margin, margin, margin + diameter, bottom - radius), paint);    canvas.drawRect(new RectF(margin + radius, margin, right, bottom), paint);  }  private void drawBottomRightRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(right - diameter, bottom - diameter, right, bottom), radius,        radius, paint);    canvas.drawRect(new RectF(margin, margin, right - radius, bottom), paint);    canvas.drawRect(new RectF(right - radius, margin, right, bottom - radius), paint);  }  private void drawTopRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(margin, margin, right, margin + diameter), radius, radius,        paint);    canvas.drawRect(new RectF(margin, margin + radius, right, bottom), paint);  }  private void drawBottomRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(margin, bottom - diameter, right, bottom), radius, radius,        paint);    canvas.drawRect(new RectF(margin, margin, right, bottom - radius), paint);  }  private void drawLeftRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(margin, margin, margin + diameter, bottom), radius, radius,        paint);    canvas.drawRect(new RectF(margin + radius, margin, right, bottom), paint);  }  private void drawRightRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(right - diameter, margin, right, bottom), radius, radius, paint);    canvas.drawRect(new RectF(margin, margin, right - radius, bottom), paint);  }  private void drawOtherTopLeftRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(margin, bottom - diameter, right, bottom), radius, radius,        paint);    canvas.drawRoundRect(new RectF(right - diameter, margin, right, bottom), radius, radius, paint);    canvas.drawRect(new RectF(margin, margin, right - radius, bottom - radius), paint);  }  private void drawOtherTopRightRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(margin, margin, margin + diameter, bottom), radius, radius,        paint);    canvas.drawRoundRect(new RectF(margin, bottom - diameter, right, bottom), radius, radius,        paint);    canvas.drawRect(new RectF(margin + radius, margin, right, bottom - radius), paint);  }  private void drawOtherBottomLeftRoundRect(Canvas canvas, Paint paint, float right, float bottom) {    canvas.drawRoundRect(new RectF(margin, margin, right, margin + diameter), radius, radius,        paint);    canvas.drawRoundRect(new RectF(right - diameter, margin, right, bottom), radius, radius, paint);    canvas.drawRect(new RectF(margin, margin + radius, right - radius, bottom), paint);  }  private void drawOtherBottomRightRoundRect(Canvas canvas, Paint paint, float right,      float bottom) {    canvas.drawRoundRect(new RectF(margin, margin, right, margin + diameter), radius, radius,        paint);    canvas.drawRoundRect(new RectF(margin, margin, margin + diameter, bottom), radius, radius,        paint);    canvas.drawRect(new RectF(margin + radius, margin + radius, right, bottom), paint);  }  private void drawDiagonalFromTopLeftRoundRect(Canvas canvas, Paint paint, float right,      float bottom) {    canvas.drawRoundRect(new RectF(margin, margin, margin + diameter, margin + diameter), radius,        radius, paint);    canvas.drawRoundRect(new RectF(right - diameter, bottom - diameter, right, bottom), radius,        radius, paint);    canvas.drawRect(new RectF(margin, margin + radius, right - diameter, bottom), paint);    canvas.drawRect(new RectF(margin + diameter, margin, right, bottom - radius), paint);  }  private void drawDiagonalFromTopRightRoundRect(Canvas canvas, Paint paint, float right,      float bottom) {    canvas.drawRoundRect(new RectF(right - diameter, margin, right, margin + diameter), radius,        radius, paint);    canvas.drawRoundRect(new RectF(margin, bottom - diameter, margin + diameter, bottom), radius,        radius, paint);    canvas.drawRect(new RectF(margin, margin, right - radius, bottom - radius), paint);    canvas.drawRect(new RectF(margin + radius, margin + radius, right, bottom), paint);  }  @Override public String toString() {    return "RoundedTransformation(radius=" + radius + ", margin=" + margin + ", diameter="        + diameter + ", cornerType=" + cornerType.name() + ")";  }  @Override public boolean equals(Object o) {    return o instanceof RoundedCornersTransformation &&        ((RoundedCornersTransformation) o).radius == radius &&        ((RoundedCornersTransformation) o).diameter == diameter &&        ((RoundedCornersTransformation) o).margin == margin &&        ((RoundedCornersTransformation) o).cornerType == cornerType;  }  @Override public int hashCode() {    return ID.hashCode() + radius * 10000 + diameter * 1000 + margin * 100 + cornerType.ordinal() * 10;  }  @Override public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {    messageDigest.update((ID + radius + diameter + margin + cornerType).getBytes(CHARSET));  }}

Glide.with(mContext).load(mResId[position]).apply(RequestOptions.bitmapTransform(new RoundedCornersTransformation(50, 0))).into(holder.mImageView);

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