先看下效果圖：

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; import android.os.Bundle; import android.widget.ImageView; public class PicActivity extends Activity { final int reflectionGap = 4; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.picture); ImageView imageView = (ImageView) findViewById(R.id.pic); Bitmap originalImage = BitmapFactory.decodeResource(this .getResources(), R.drawable.car); int width = originalImage.getWidth(); int height = originalImage.getHeight(); Matrix matrix = new Matrix(); //matrix.setRotate(30); matrix.preScale(1, -1); Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height / 2, width, height / 2, matrix, false); Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888); Canvas canvas = new Canvas(bitmapWithReflection); canvas.drawBitmap(originalImage, 0, 0, null); Paint deafaultPaint = new Paint(); // 抗鋸齒的方法 // deafaultPaint.setAntiAlias(true); canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint); canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null); Paint paint = new Paint(); // 抗鋸齒的方法 // paint.setAntiAlias(true); //線性漸變 LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP); paint.setShader(shader); paint.setXfermode(new PorterDuffXfermode(Mode.DARKEN)); canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint); imageView.setImageBitmap(bitmapWithReflection); } }

總結

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