Android编程实现文字倒影效果的方法

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"/>

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="[email protected]"/>

/*

* 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.**apa*che.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 [email protected]

*

* @author TC

*/

packagecom.tc.reflect;

importandroid.content.Context;

importandroid.graphics.Bitmap;

importandroid.graphics.Canvas;

importandroid.graphics.LinearGradient;

importandroid.graphics.Matrix;

importandroid.graphics.Paint;

importandroid.graphics.PorterDuffXfermode;

importandroid.graphics.PorterDuff.Mode;

importandroid.graphics.Shader.TileMode;

importandroid.util.AttributeSet;

importandroid.widget.TextView;

publicclassReflectTextViewextendsTextView {

publicReflectTextView(Context context) {

super(context);

}

publicReflectTextView(Context context, AttributeSet attrs,intdefStyle) {

super(context, attrs, defStyle);

}

publicReflectTextView(Context context, AttributeSet attrs) {

super(context, attrs);

}

@Override

protectedvoidonDraw(Canvas canvas) {

//draw the text from layout()

super.onDraw(canvas);

intheight = getHeight();

intwidth = getWidth();

//make the shadow reverse of Y

Matrix matrix =newMatrix();

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 =newPaint();

LinearGradient shader =newLinearGradient(0,8* height /12,0,

height,0x70ffffff,0x00ffffff, TileMode.CLAMP);

paint.setShader(shader);

paint.setXfermode(newPorterDuffXfermode(Mode.DST_IN));

canvas.drawRect(0,8* height /12, width, height, paint);

}

}