Android程序设计-圆形图片的实现

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在android中，google只提供了对图形的圆形操作，而没有实现对图片的圆形操作，所以我们无法实现上述操作，在此我们将使用框架进行设计（下述框架为as编写）：
https://github.com/monsterLin/RoundedImageView
https://github.com/pungrue26/SelectableRoundedImageView
https://github.com/hdodenhof/CircleImageView
https://github.com/MostafaGazar/CustomShapeImageView
https://github.com/siyamed/android-shape-imageview

下面我们通过使用RoundedImageView来是实现这种效果：

首先我们在项目中导入开源框架：

导入成功后-

第一种方式：直接书写xml文件：

<com.makeramen.roundedimageview.RoundedImageView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/imageView1"
android:layout_width="40dp"
android:layout_height="40dp"
android:src="@drawable/photo"
app:riv_corner_radius="30dip"
app:riv_border_width="2dip"
app:riv_border_color="#333333"
app:riv_mutate_background="true"
app:riv_oval="true" />

第二种方式：通过代码实现：

public static class RoundedDrawable extends Drawable { protected final float cornerRadius;
protected final int margin; protected final RectF mRect = new RectF(),
mBitmapRect;
protected final BitmapShader bitmapShader;
protected final Paint paint; public RoundedDrawable(Bitmap bitmap, int cornerRadius, int margin) {
this.cornerRadius = cornerRadius;
this.margin = margin; bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
mBitmapRect = new RectF (margin, margin, bitmap.getWidth() - margin, bitmap.getHeight() - margin); paint = new Paint();
paint.setAntiAlias(true);
paint.setShader(bitmapShader);
} @Override
protected void onBoundsChange(Rect bounds) {
super.onBoundsChange(bounds);
mRect.set(margin, margin, bounds.width() - margin, bounds.height() - margin); // Resize the original bitmap to fit the new bound
Matrix shaderMatrix = new Matrix();
shaderMatrix.setRectToRect(mBitmapRect, mRect, Matrix.ScaleToFit.FILL);
bitmapShader.setLocalMatrix(shaderMatrix); } @Override
public void draw(Canvas canvas) {
canvas.drawRoundRect(mRect, cornerRadius, cornerRadius, paint);
} @Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
} @Override
public void setAlpha(int alpha) {
paint.setAlpha(alpha);
} @Override
public void setColorFilter(ColorFilter cf) {
paint.setColorFilter(cf);
}
}imageAware.setImageDrawable(new RoundedDrawable(bitmap, cornerRadius, margin));