Java实现图片倒影代码，java实现倒影,/*实现图片倒影(tes

Java实现图片倒影代码，java实现倒影,/*实现图片倒影(tes

/*实现图片倒影(tested)*/public class ButtonImageActivity extends Activity {    /** Called when the activity is first created. */    private ImageView image_btn;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        image_btn=(ImageView)findViewById(R.id.image_btn);        Bitmap bitmap =((BitmapDrawable)getResources().getDrawable(R.drawable.image_btn)).getBitmap();        image_btn.setImageBitmap(createReflectedImage(bitmap));        image_btn.setOnClickListener(new OnClickListener() {            public void onClick(View v) {                // TODO Auto-generated method stub            }        });    }    private Bitmap createReflectedImage(Bitmap originalBitmap) {         // 图片与倒影间隔距离         final int reflectionGap = 4;         // 图片的宽度         int width = originalBitmap.getWidth();         // 图片的高度         int height = originalBitmap.getHeight();         Matrix matrix = new Matrix();         // 图片缩放，x轴变为原来的1倍，y轴为-1倍,实现图片的反转         matrix.preScale(1, -1);         // 创建反转后的图片Bitmap对象，图片高是原图的一半。         Bitmap reflectionBitmap = Bitmap.createBitmap(originalBitmap, 0,                 height / 2, width, height / 2, matrix, false);         // 创建标准的Bitmap对象，宽和原图一致，高是原图的1.5倍。         Bitmap withReflectionBitmap = Bitmap.createBitmap(width, (height                 + height / 2 + reflectionGap), Config.ARGB_8888);         // 构造函数传入Bitmap对象，为了在图片上画图         Canvas canvas = new Canvas(withReflectionBitmap);         // 画原始图片         canvas.drawBitmap(originalBitmap, 0, 0, null);         // 画间隔矩形         Paint defaultPaint = new Paint();         canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);         // 画倒影图片         canvas.drawBitmap(reflectionBitmap, 0, height + reflectionGap, null);         // 实现倒影效果         Paint paint = new Paint();         LinearGradient shader = new LinearGradient(0, originalBitmap.getHeight(),                  0, withReflectionBitmap.getHeight(), 0x70ffffff, 0x00ffffff,                 TileMode.MIRROR);         paint.setShader(shader);         paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));         // 覆盖效果         canvas.drawRect(0, height, width, withReflectionBitmap.getHeight(), paint);         return withReflectionBitmap;     } }