自定义圆形的ImageView

下面重写ImageView

import android.content.Context;
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.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * * 自定义的圆形ImageView，可以直接当组件在布局中使用。
 * 
 * @author caizhiming
 */
public class MyImageView extends ImageView {
private Paint paint;

public MyImageView(Context context) {
this(context, null);
    }

public MyImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
    }

public MyImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
        paint = new Paint();

    }

/**
 * * 绘制圆形图片
 * 
 * @author caizhiming
 */
@Override
protected void onDraw(Canvas canvas) {

        Drawable drawable = getDrawable();
if (null != drawable) {
            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
            Bitmap b = getCircleBitmap(bitmap, 14);
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);
        }
    }

/**
 * * 获取圆形图片方法
 * 
 * @param bitmap
 * @param pixels
 * @return Bitmap
 * @author caizhiming
 */
private Bitmap getCircleBitmap(Bitmap bitmap, int pixels) {
        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());
        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
int x = bitmap.getWidth();

        canvas.drawCircle(x / 2, x / 2, x / 2, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);
return output;

    }
}

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下面就是在布局文件中如何使用重写后的ImageView

        <重写类所在的包路径.MyImageView
 android:id="@+id/fragment_my_head"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerHorizontal="true"
android:src="@drawable/act_morentouxaing" />

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