Android 設定圖片倒影效果

標籤：android   style   blog   http   color   java   os   io   

首先，貼出：

1.布局檔案main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello" />    <ImageView        android:id="@+id/picture_qian"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:src="@drawable/horse" /></LinearLayout>

2.MainActivity介面java代碼：

 1 package com.easymorse.picture; 2  3 import android.app.Activity; 4 import android.graphics.Bitmap; 5 import android.graphics.Bitmap.Config; 6 import android.graphics.Canvas; 7 import android.graphics.LinearGradient; 8 import android.graphics.Matrix; 9 import android.graphics.Paint;10 import android.graphics.PorterDuff.Mode;11 import android.graphics.PorterDuffXfermode;12 import android.graphics.Shader.TileMode;13 import android.graphics.drawable.BitmapDrawable;14 import android.os.Bundle;15 import android.widget.ImageView;16 17 public class MainActivity extends Activity {18     /** Called when the activity is first created. */19     @Override20     public void onCreate(Bundle savedInstanceState) {21         super.onCreate(savedInstanceState);22         setContentView(R.layout.main);23         ImageView imageView2 = (ImageView) findViewById(R.id.picture_qian);24 25         Bitmap bmp = ((BitmapDrawable) getResources().getDrawable(26                 R.drawable.horse)).getBitmap();27 28         imageView2.setImageBitmap(createReflectedImage(bmp));29     }30 31     public static Bitmap createReflectedImage(Bitmap originalImage) {32 33         final int reflectionGap = 4;34 35         int width = originalImage.getWidth();36         int height = originalImage.getHeight();37 38         Matrix matrix = new Matrix();39         matrix.preScale(1, -1);40 41         Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,42                 height / 2, width, height / 2, matrix, false);43 44         Bitmap bitmapWithReflection = Bitmap.createBitmap(width,45                 (height + height / 2), Config.ARGB_8888);46 47         Canvas canvas = new Canvas(bitmapWithReflection);48 49         canvas.drawBitmap(originalImage, 0, 0, null);50 51         Paint defaultPaint = new Paint();52         canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);53 54         canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);55 56         Paint paint = new Paint();57         LinearGradient shader = new LinearGradient(0,58                 originalImage.getHeight(), 0, bitmapWithReflection.getHeight()59                         + reflectionGap, 0x70ffffff, 0x00ffffff,60                 TileMode.MIRROR);61 62         paint.setShader(shader);63 64         paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));65 66         canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()67                 + reflectionGap, paint);68 69         return bitmapWithReflection;70     }71 }