本文实例讲述了Android编程实现文字倒影效果的方法。分享给大家供大家参考，具体如下：
我们所有的view都继承自View类，View类里有个方法叫ondraw(). 即，我们看到的界面都是画出来的，所以我们可以重写ondraw()方法。
既然知道了这点就好办了，还有个难点就是，我们的倒影也是画出来的，那我们从哪去取原始图片呢？熟悉View的童鞋都知道Cache这个东西，不错，就是通过Cache我们取到了原始图片。
放源码了。，感谢期待。这个只是个demo，并不完善哈，布局什么的还需要调整下，或者我什么时候有空再进行一次封装，就可以直接从布局文件中任意调整了。
布局文件中增加如下代码
<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" />
类代码如下：
/* * 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); } }
更多关于Android相关内容感兴趣的读者可查看本站专题：《Android图形与图像处理技巧总结》、《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》
希望本文所述对大家Android程序设计有所帮助。