Java实现图片倒影的代码，java实现倒影,/*实现图片倒影(tes

Java实现图片倒影的代码，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;      }  }