自定义圆形的ImageView

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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;    }}

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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