Java如何编写实现图片倒影效果的代码示例？

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将伪原创内容改写如下：

整理了一份工作中常用的代码片段记录，以下是一个Java实现图片倒影效果的代码示例，适用于需要大量使用此功能的开发者。代码如下：+public+class+ButtonImageActivity+extends+Activity+%7B+private+ImageView+image_btn%3B+@Override+pub%E2%80%9D+

把做工程过程常用的一些代码段做个记录，下面代码是关于Java实现图片倒影的的代码，应该对大家有较大用处。

public class ButtonImageActivity extends Activity { 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) { } }); } private Bitmap createReflectedImage(Bitmap originalBitmap) { final int reflectionGap = 4; int width = originalBitmap.getWidth(); int height = originalBitmap.getHeight(); Matrix matrix = new Matrix(); matrix.preScale(1, -1); Bitmap reflectionBitmap = Bitmap.createBitmap(originalBitmap, 0, height / 2, width, height / 2, matrix, false); Bitmap withReflectionBitmap = Bitmap.createBitmap(width, (height + height / 2 + reflectionGap), Config.ARGB_8888); Canvas canvas = new Canvas(withReflectionBitmap); canvas.drawBitmap(originalBitmap, 0, 0, null); Paint defaultPaint = new Paint(); canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint); canvas.drawBitmap(reflectionBitmap, 0, height + reflectionGap, null); 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)); canvas.drawRect(0, height, width, withReflectionBitmap.getHeight(), paint); return withReflectionBitmap; } }

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