图片倒影效果实例

package pictrue.pictruepackage.captain;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.widget.ImageView;

public class Pictrue_flamActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ImageView imageView2 = (ImageView) findViewById(R.id.picture_qian);

		Bitmap bmp = ((BitmapDrawable)getResources().getDrawable(R.drawable.textpage)).getBitmap();

		imageView2.setImageBitmap(createReflectedImage(bmp));
	}

	public static Bitmap createReflectedImage(Bitmap originalImage) {

		final int reflectionGap = 4;

		int width = originalImage.getWidth();
		int height = originalImage.getHeight();

		Matrix matrix = new Matrix();
		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 defaultPaint = new Paint();
		canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);

		canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

		Paint paint = new Paint();
		LinearGradient shader = new LinearGradient(0,
				originalImage.getHeight(), 0, bitmapWithReflection.getHeight()
						+ reflectionGap, 0x70ffffff, 0x00ffffff,
				TileMode.MIRROR);

		paint.setShader(shader);

		paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));

		canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
				+ reflectionGap, paint);

		return bitmapWithReflection;
	
    }
}

main.xml

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
    <ImageView android:id="@+id/picture_qian"
			android:layout_width="fill_parent"
			 android:layout_height="fill_parent"
			android:src="@drawable/textpage" />
</LinearLayout>