Android图片倒影

图片的倒影效果可以让想要显示的图片呈现出3D的效果，实现很简单，只需要将图片的下半部分翻转后加入线性渐变效果即可，可以实现如下图所示的效果：

这里首先创建一个用来图片处理的类：ReflectImage:

<span style="font-size:18px;">public class ReflectImage {
private final static int REFLECT_GAP = 4;// 倒影区图像与原始图像之间的间距

// 倒影图片创建类
public static Bitmap createReflectImg(Bitmap oriBitmap) {
int bitmapHeight = oriBitmap.getHeight() * 3 / 2 + REFLECT_GAP;
int bitmapWidth = oriBitmap.getWidth() * 3 / 2;
Bitmap reflectBitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight,
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(reflectBitmap);
canvas.drawBitmap(oriBitmap, 0, 0, null);
Matrix ReflectM = new Matrix();
ReflectM.preScale(1, -1);
Bitmap newBitmap = Bitmap.createBitmap(oriBitmap, 0,
oriBitmap.getHeight() / 2, oriBitmap.getWidth(),
oriBitmap.getHeight() / 2, ReflectM, false);
canvas.drawBitmap(newBitmap, 0, oriBitmap.getHeight() + REFLECT_GAP,
null);

Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, oriBitmap.getHeight(), 0,
bitmapHeight, 0x70ffffff, 0x00ffffff,
TileMode.CLAMP);
// Set the paint to use this shader (linear gradient)
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvas.drawRect(0, oriBitmap.getHeight(), oriBitmap.getWidth(),
bitmapHeight, paint);
return reflectBitmap;
}
}</span>

使用方法：

<span style="font-size:18px;">public class Main extends Activity{
private ImageView imgShow;

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 实例化launcher列表
setContentView(R.layout.main);
imgShow=(ImageView)findViewById(R.id.img_show);
// MyImgView.drawableToBitmap(lvalue.get(position).icon)
Bitmap bitmap = BitmapFactory.decodeResource(
mActivity.getResources(), R.drawable.xuanjianyong);
imgShow.setImageBitmap(ReflectImage.createReflectImg(bitmap));// 加入处理过的图片
}
}</span>