效果图:

參看下面代码：

public class MainActivity extends Activity {

	private ImageView imageView1;

	private ImageView imageView2;

	Bitmap mBitmap;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.image);

		initView();

	}

	private void initView(){

		imageView1=(ImageView)findViewById(R.id.imageView1);

		imageView2=(ImageView)findViewById(R.id.imageView2);

		//读取资源图片

		mBitmap=readBitMap();

		//对资源图片进行缩放

		Bitmap bitmap=zoomBitmap(mBitmap, mBitmap.getWidth()/2, mBitmap.getHeight()/2);

		//设置圆角图片

		imageView2.setImageBitmap(setRoundedCorner(bitmap,20f));

	}

	/**

	 * 读取资源图片

	 * @return

	 */

	private Bitmap readBitMap(){

		BitmapFactory.Options opt=new BitmapFactory.Options();

		/*

		 * 设置让解码器以最佳方式解码

		 */

		opt.inPreferredConfig=Bitmap.Config.RGB_565;

		//以下两个字段须要组合使用

		opt.inPurgeable=true;

		opt.inInputShareable=true;

		/*

		 * 获取资源图片

		 */

		InputStream is=this.getResources().openRawResource(R.drawable.mei);

		return BitmapFactory.decodeStream(is, null, opt);

	}

	/**

	 * 缩放图片

	 * @param bitmap

	 * @param w

	 * @param h

	 * @return

	 */

	public  Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {

		int width = bitmap.getWidth();

		int height = bitmap.getHeight();

		Matrix matrix = new Matrix();

		float scaleWidht = ((float) w / width);

		float scaleHeight = ((float) h / height);

		/*

		 * 通过Matrix类的postScale方法进行缩放

		 */

		matrix.postScale(scaleWidht, scaleHeight);

		Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);

		return newbmp;

	}

	/**

	 * 设置图片为圆角

	 * @param bitmap

	 * @param roundPx  圆角角度

	 * @return

	 */

	public  Bitmap setRoundedCorner(Bitmap bitmap, float roundPx) {

		Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);

		Canvas canvas = new Canvas(output);

		final Paint paint = new Paint();

		final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

		/*

		 * 椭圆形

		 */

		final RectF rectF = new RectF(rect);

		/*

		 * 去锯齿

		 */

		paint.setAntiAlias(true);

		canvas.drawARGB(0, 0, 0, 0);

		/*

		 * 绘制圆角矩形

		 */

		canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

		/*

		 * 设置两个图形相交

		 */

		paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

		canvas.drawBitmap(bitmap, rect, rect, paint);

		return output;

	}

}

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