制作TextView的倒影

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package com.javaeye.graphics;

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.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class BitmapReflect extends Activity
{
	private static final String TAG = "***BitmapFactoryOptionsTest***";
	
	LinearLayout ly;
	TextView name;
	TextView phone;
	
	public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);
        
        name = new TextView(this);
        phone = new TextView(this);
        
        name.setText("bruce zhang");
        phone.setText("13739188962");
        
        ly = new LinearLayout(this);
        ly.setOrientation(LinearLayout.VERTICAL);
        LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams(
        		LinearLayout.LayoutParams.WRAP_CONTENT,
        		LinearLayout.LayoutParams.WRAP_CONTENT);
        ly.setLayoutParams(llp);
        ly.addView(name);
        ly.addView(phone);
        
        Button button = new Button(this);
        button.setText("OK");
        button.setOnClickListener(new View.OnClickListener()
		{
			@Override
			public void onClick(View v)
			{
				 int width = phone.getWidth();
			        int height = name.getHeight() + phone.getHeight();
			        Log.e(TAG, "width: " + width + " height: " + height);
			        
			        Bitmap.Config bc = Bitmap.Config.ARGB_8888;
			        Bitmap bitmap = Bitmap.createBitmap(width, height, bc);
			        
			        Canvas canvas = new Canvas(bitmap);
			        ly.draw(canvas);
			        
			        Bitmap bitmap2 = createReflectedImage(bitmap);
			        
			        ImageView image = new ImageView(BitmapReflect.this);
			        image.setBackgroundDrawable(new BitmapDrawable(bitmap2));
			        ly.addView(image);
			        ly.postInvalidate();
			}
		});
        ly.addView(button);
        
       
        setContentView(ly);
	}
	
	public static Bitmap createReflectedImage(Bitmap originalImage) {  
	    final int reflectionGap = 4;  //倒影和原图片间的距离
	    int width = originalImage.getWidth();   
	    int height = originalImage.getHeight();
	    
	    Matrix matrix = new Matrix();   
	    matrix.preScale(1, -1);  
	    
	    //倒影部分
	    Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 
	    		0, height / 2, width, height / 2, matrix, false);  
	    //要返回的倒影图片
	    Bitmap bitmapWithReflection = Bitmap.createBitmap(width,   
	            (height + height / 2), Config.ARGB_8888);  
	    
	    Canvas canvas = new Canvas(bitmapWithReflection);  
	    //画原来的图片
	    canvas.drawBitmap(originalImage, 0, 0, null);  
	    
	    Paint defaultPaint = new Paint();   
	    //倒影和原图片间的距离
	    canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);  
	    //画倒影部分
	    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;   
	}  
}