Android编程实现文字倒影效果的方法

<com.tc.reflect.ReflectTextView    android:layout_marginTop="20dp"    android:id="@+id/test_reflect" android:layout_width="fill_parent"    android:layout_height="50dp" android:textSize="25dp"    android:textColor="#ff0000" android:textStyle="bold" android:gravity="top|center_horizontal"    android:text="不会飞翔的翅膀 XP.C" />    <com.tc.reflect.ReflectTextView    android:layout_marginTop="20dp"    android:id="@+id/test_reflect" android:layout_width="fill_parent"    android:layout_height="50dp" android:textSize="25dp"    android:textColor="#a0a0a0" android:textStyle="italic" android:gravity="top|center_horizontal"    android:text="titanchen2000@yahoo.com.cn" />

/* * Copyright (C) 2011 TC Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. You may obtain a copy of the License at * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, * either express or implied. See the License for the specific language governing permissions and limitations under the * License. This code is base on the Android TextView and was Created by titanchen2000@yahoo.com.cn * * @author TC */package com.tc.reflect;import android.content.Context;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.PorterDuff.Mode;import android.graphics.Shader.TileMode;import android.util.AttributeSet;import android.widget.TextView;public class ReflectTextView extends TextView {  public ReflectTextView(Context context) {    super(context);  }  public ReflectTextView(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);  }  public ReflectTextView(Context context, AttributeSet attrs) {    super(context, attrs);  }  @Override  protected void onDraw(Canvas canvas) {    //draw the text from layout()    super.onDraw(canvas);    int height = getHeight();    int width = getWidth();    //make the shadow reverse of Y    Matrix matrix = new Matrix();    matrix.preScale(1, -1);    //make sure you can use the cache    setDrawingCacheEnabled(true);    //create bitmap from cache,this is the most important of this    Bitmap originalImage = Bitmap.createBitmap(getDrawingCache());    //create the shadow    Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,        height / 3, width, height / 3, matrix, false);    //draw the shadow    canvas.drawBitmap(reflectionImage, 0, 8 * height / 12, null);    //process shadow bitmap to make it shadow like    Paint paint = new Paint();    LinearGradient shader = new LinearGradient(0, 8 * height / 12, 0,        height, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);    paint.setShader(shader);    paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));    canvas.drawRect(0, 8 * height / 12, width, height, paint);  }}