android 头像 圆形遮罩

用户头像圆形遮罩两种实现方法：

方法一（推荐）：

public abstract class MaskedImageView extends ImageView {
private static final Xfermode MASK_XFERMODE;
private Bitmap mask;
private Paint paint;

static {
PorterDuff.Mode localMode = PorterDuff.Mode.DST_IN;
MASK_XFERMODE = new PorterDuffXfermode(localMode);
}

public MaskedImageView(Context paramContext) {
super(paramContext);
}

public MaskedImageView(Context paramContext, AttributeSet paramAttributeSet) {
super(paramContext, paramAttributeSet);
}

public MaskedImageView(Context paramContext,
AttributeSet paramAttributeSet, int paramInt) {
super(paramContext, paramAttributeSet, paramInt);
}

public abstract Bitmap createMask();

protected void onDraw(Canvas paramCanvas) {
Drawable localDrawable = getDrawable();
if (localDrawable == null)
return;
try {
if (this.paint == null) {
Paint localPaint1 = new Paint();
this.paint = localPaint1;
this.paint.setFilterBitmap(false);
Paint localPaint2 = this.paint;
Xfermode localXfermode1 = MASK_XFERMODE;
@SuppressWarnings("unused")
Xfermode localXfermode2 = localPaint2
.setXfermode(localXfermode1);
}
float f1 = getWidth();
float f2 = getHeight();
int i = paramCanvas.saveLayer(0.0F, 0.0F, f1, f2, null, 31);
int j = getWidth();
int k = getHeight();
localDrawable.setBounds(0, 0, j, k);
localDrawable.draw(paramCanvas);
if ((this.mask == null) || (this.mask.isRecycled())) {
Bitmap localBitmap1 = createMask();
this.mask = localBitmap1;
}
Bitmap localBitmap2 = this.mask;
Paint localPaint3 = this.paint;
paramCanvas.drawBitmap(localBitmap2, 0.0F, 0.0F, localPaint3);
paramCanvas.restoreToCount(i);
return;
} catch (Exception localException) {
Log.e("ender", "MaskedImageView exception = " + localException);
}
}
}

public class CircularImage extends MaskedImageView {
public CircularImage(Context paramContext) {
super(paramContext);
}

public CircularImage(Context paramContext, AttributeSet paramAttributeSet) {
super(paramContext, paramAttributeSet);
}

public CircularImage(Context paramContext, AttributeSet paramAttributeSet,
int paramInt) {
super(paramContext, paramAttributeSet, paramInt);
}

public Bitmap createMask() {
int i = getWidth();
int j = getHeight();
Bitmap.Config localConfig = Bitmap.Config.ARGB_8888;
Bitmap localBitmap = Bitmap.createBitmap(i, j, localConfig);
Canvas localCanvas = new Canvas(localBitmap);
Paint localPaint = new Paint(1);
localPaint.setColor(-16777216);
float f1 = getWidth();
float f2 = getHeight();
RectF localRectF = new RectF(0.0F, 0.0F, f1, f2);
localCanvas.drawOval(localRectF, localPaint);
return localBitmap;
}

}

调用：

xml:

        <.....view.CircularImage
            android:id="@+id/ic_user"
            android:layout_width="70dp"
            android:layout_height="70dp"
            android:layout_centerVertical="true"
            android:contentDescription="@string/app_name"
            android:src="@drawable/ic_user_default" />

java:

CircularImage cover_user_photo = (CircularImage) findViewById(R.id.cover_user_photo2);
cover_user_photo.setImageResource(R.drawable.face);

方法二（毛边过滤）：

public class ImageCircleView extends ImageView{

Path path;
public abstract class MaskedImageView extends ImageView {
private static final Xfermode MASK_XFERMODE;
private Bitmap mask;
private Paint paint;

static {
PorterDuff.Mode localMode = PorterDuff.Mode.DST_IN;
MASK_XFERMODE = new PorterDuffXfermode(localMode);
}

public MaskedImageView(Context paramContext) {
super(paramContext);
}

public MaskedImageView(Context paramContext, AttributeSet paramAttributeSet) {
super(paramContext, paramAttributeSet);
}

public MaskedImageView(Context paramContext,
AttributeSet paramAttributeSet, int paramInt) {
super(paramContext, paramAttributeSet, paramInt);
}

public abstract Bitmap createMask();

protected void onDraw(Canvas paramCanvas) {
Drawable localDrawable = getDrawable();
if (localDrawable == null)
return;
try {
if (this.paint == null) {
Paint localPaint1 = new Paint();
this.paint = localPaint1;
this.paint.setFilterBitmap(false);
Paint localPaint2 = this.paint;
Xfermode localXfermode1 = MASK_XFERMODE;
@SuppressWarnings("unused")
Xfermode localXfermode2 = localPaint2
.setXfermode(localXfermode1);
}
float f1 = getWidth();
float f2 = getHeight();
int i = paramCanvas.saveLayer(0.0F, 0.0F, f1, f2, null, 31);
int j = getWidth();
int k = getHeight();
localDrawable.setBounds(0, 0, j, k);
localDrawable.draw(paramCanvas);
if ((this.mask == null) || (this.mask.isRecycled())) {
Bitmap localBitmap1 = createMask();
this.mask = localBitmap1;
}
Bitmap localBitmap2 = this.mask;
Paint localPaint3 = this.paint;
paramCanvas.drawBitmap(localBitmap2, 0.0F, 0.0F, localPaint3);
paramCanvas.restoreToCount(i);
return;
} catch (Exception localException) {
Log.e("ender", "MaskedImageView exception = " + localException);
}
}
}
调用：ImageCircleView qq = (ImageCircleView)findViewById(R.id.cover_user_photo2);    qq.setImageResource(R.drawable.face);