Android圆形的ImageView

很对不住大家此代码有问题，这样做出来的原形imageview没有抗锯齿，到这图片边缘模糊效果如下：

由于项目需要图片要做成圆形的，只能自定义ImageView，下边自定义的ImageView效果如上图，边缘不抗锯齿，模糊

public class RoundImageView extends ImageView {

public RoundImageView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}

public RoundImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}

@Override
protected void onDraw(Canvas canvas) {
Path clipPath = new Path();
int w = this.getWidth();
int h = this.getHeight();
clipPath.addCircle(w / 2, h / 2, w / 2, Path.Direction.CW);
canvas.clipPath(clipPath);
canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG
| Paint.FILTER_BITMAP_FLAG));
super.onDraw(canvas);
}

}

所以不建议用上边的代码了：更改起自定义ImageView的代码，实现圆形ImageView的边缘抗锯齿：效果图如下：

我想大家看到效果了，圆形ImageView边缘已经不在模糊了；其自定义的ImageView的代码如下：

public class RoundImageView extends ImageView {

public RoundImageView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}

public RoundImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}

@Override
protected void onDraw(Canvas canvas) {

Drawable drawable = getDrawable();

if (drawable == null) {
return;
}

if (getWidth() == 0 || getHeight() == 0) {
return;
}

Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

int w = getWidth(), h = getHeight();

Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
canvas.drawBitmap(roundBitmap, 0, 0, null);

}

public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
Bitmap sbmp;
if (bmp.getWidth() != radius || bmp.getHeight() != radius)
sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);
else
sbmp = bmp;
Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), sbmp.getHeight(),
Config.ARGB_8888);
Canvas canvas = new Canvas(output);

final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());

paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.parseColor("#BAB399"));
canvas.drawCircle(sbmp.getWidth() / 2 + 0.7f,
sbmp.getHeight() / 2 + 0.7f, sbmp.getWidth() / 2 + 0.1f, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(sbmp, rect, rect, paint);

return output;
}

}

布局layout如下：将自定义的Imageview添加到layout里边

android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:orientation="horizontal" >

android:id="@+id/dashen_more_list_img"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_gravity="center_vertical"
android:layout_marginBottom="6dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="20dp"
android:layout_marginTop="6dp"
android:background="@drawable/dashen_more_img_bj"
android:scaleType="fitXY" />

android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="8dp"
android:gravity="center_vertical"
android:orientation="horizontal" >

android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center_vertical"
android:orientation="vertical" >

android:id="@+id/dashen_more_list_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#4B5558"
android:textSize="18dp" />

android:id="@+id/dashen_more_list_dec"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#A5AAAB"
android:textSize="13dp" />

android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:layout_weight="5"
android:orientation="horizontal" >

android:id="@+id/dashen_more_list_right"
android:layout_width="10dp"
android:layout_height="15dp"
android:layout_gravity="center_vertical"
android:layout_marginRight="20dp"
android:src="@drawable/right"
android:scaleType="fitXY" />

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