本文實例講述了Android編程實現文字倒影效果的方法。分享給大家供大家參考,具體如下:
我們所有的view都繼承自View類,View類里有個方法叫ondraw(). 即,我們看到的界面都是畫出來的,所以我們可以重寫ondraw()方法。
既然知道了這點就好辦了,還有個難點就是,我們的倒影也是畫出來的,那我們從哪去取原始圖片呢?熟悉View的童鞋都知道Cache這個東西,不錯,就是通過Cache我們取到了原始圖片。
放源碼了。,感謝期待。這個只是個demo,并不完善哈,布局什么的還需要調整下,或者我什么時候有空再進行一次封裝,就可以直接從布局文件中任意調整了。
布局文件中增加如下代碼
<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="不會飛翔的翅膀 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" />
類代碼如下:
/* * 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); }}更多關于Android相關內容感興趣的讀者可查看本站專題:《Android圖形與圖像處理技巧總結》、《Android開發入門與進階教程》、《Android調試技巧與常見問題解決方法匯總》、《Android基本組件用法總結》、《Android視圖View技巧總結》、《Android布局layout技巧總結》及《Android控件用法總結》
希望本文所述對大家Android程序設計有所幫助。
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