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main.activity如下:

package c.c;import android.os.Bundle;import android.widget.ImageView;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.graphics.Shader.TileMode;/** * Demo:生成Bitmap的倒影 */public class MainActivity extends Activity {	private ImageView mImageView;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		mImageView=(ImageView) findViewById(R.id.imageView);		Bitmap rawBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.a);		Bitmap newBitmap=getBitmapReflection(rawBitmap);		mImageView.setImageBitmap(newBitmap);	}	private Bitmap getBitmapReflection(Bitmap rawBitmap) {		final int gap = 4;		int width = rawBitmap.getWidth();		int height = rawBitmap.getHeight();		Matrix matrix = new Matrix();		//逆置		matrix.preScale(1, -1);		//倒影		Bitmap reflectionBitmap =		Bitmap.createBitmap(rawBitmap, 0, height/2,width, height/2, matrix, false);		//带有倒影的图片		Bitmap bitmapWithReflection = 		Bitmap.createBitmap(width,(height + height/2), Config.ARGB_8888);				Canvas canvas = new Canvas(bitmapWithReflection);				//画原图		canvas.drawBitmap(rawBitmap, 0, 0, null);		Paint paint=new Paint();		//画分界线		canvas.drawRect(0, height, width, height + gap, paint);		//画倒影		canvas.drawBitmap(reflectionBitmap, 0, height + gap, null);		//沿Y轴渐变效果		LinearGradient shader = 		new LinearGradient(0, rawBitmap.getHeight(), 0,		bitmapWithReflection.getHeight() + gap, 0x70ffffff,0x00ffffff, TileMode.CLAMP);		paint.setShader(shader);		//因为有两层(倒影层和渐变),所以设置过渡模式		paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));		//画一个具有渐变效果的矩形		canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()+ gap, paint);		return bitmapWithReflection;	}	}

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