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.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 [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);

  }

}