转自：http://blog.csdn.net/android_tutor/article/details/5981753

大家好,这一节给大家分享的是Android中几种图像特效处理的小技巧,比如圆角,倒影,还有就是图片缩放,Drawable转化为Bitmap,Bitmap转化为Drawable等等.

废话少说了,直接讲解今天的实例,本例主要是先获取壁纸(getWallpaper()),然后对当前壁纸的一些特效处理.大家按步骤一步一步来:

第一步:新建一个Android工程命名为ImageDemo,工程结构如下:

第二步:新建一个.java文件,命名为ImageUtil.java,在里面定义一些图片处理方法,代码如下:

view plain print ?

1. packagecom.android.tutor;
2. importandroid.graphics.Bitmap;
3. importandroid.graphics.Canvas;
4. importandroid.graphics.LinearGradient;
5. importandroid.graphics.Matrix;
6. importandroid.graphics.Paint;
7. importandroid.graphics.PixelFormat;
8. importandroid.graphics.PorterDuffXfermode;
9. importandroid.graphics.Rect;
10. importandroid.graphics.RectF;
11. importandroid.graphics.Bitmap.Config;
12. importandroid.graphics.PorterDuff.Mode;
13. importandroid.graphics.Shader.TileMode;
14. importandroid.graphics.drawable.Drawable;
15. publicclassImageUtil{
17. //放大缩小图片
18. publicstaticBitmapzoomBitmap(Bitmapbitmap,intw,inth){
19. intwidth=bitmap.getWidth();
20. intheight=bitmap.getHeight();
21. Matrixmatrix=newMatrix();
22. floatscaleWidht=((float)w/width);
23. floatscaleHeight=((float)h/height);
24. matrix.postScale(scaleWidht,scaleHeight);
25. Bitmapnewbmp=Bitmap.createBitmap(bitmap,0,0,width,height,matrix,true);
26. returnnewbmp;
27. }
28. //将Drawable转化为Bitmap
29. publicstaticBitmapdrawableToBitmap(Drawabledrawable){
30. intwidth=drawable.getIntrinsicWidth();
31. intheight=drawable.getIntrinsicHeight();
32. Bitmapbitmap=Bitmap.createBitmap(width,height,
33. drawable.getOpacity()!=PixelFormat.OPAQUE?Bitmap.Config.ARGB_8888
34. :Bitmap.Config.RGB_565);
35. Canvascanvas=newCanvas(bitmap);
36. drawable.setBounds(0,0,width,height);
37. drawable.draw(canvas);
38. returnbitmap;
40. }
42. //获得圆角图片的方法
43. publicstaticBitmapgetRoundedCornerBitmap(Bitmapbitmap,floatroundPx){
45. Bitmapoutput=Bitmap.createBitmap(bitmap.getWidth(),bitmap
46. .getHeight(),Config.ARGB_8888);
47. Canvascanvas=newCanvas(output);
49. finalintcolor=0xff424242;
50. finalPaintpaint=newPaint();
51. finalRectrect=newRect(0,0,bitmap.getWidth(),bitmap.getHeight());
52. finalRectFrectF=newRectF(rect);
54. paint.setAntiAlias(true);
55. canvas.drawARGB(0,0,0,0);
56. paint.setColor(color);
57. canvas.drawRoundRect(rectF,roundPx,roundPx,paint);
59. paint.setXfermode(newPorterDuffXfermode(Mode.SRC_IN));
60. canvas.drawBitmap(bitmap,rect,rect,paint);
62. returnoutput;
63. }
64. //获得带倒影的图片方法
65. publicstaticBitmapcreateReflectionImageWithOrigin(Bitmapbitmap){
66. finalintreflectionGap=4;
67. intwidth=bitmap.getWidth();
68. intheight=bitmap.getHeight();
70. Matrixmatrix=newMatrix();
71. matrix.preScale(1,-1);
73. BitmapreflectionImage=Bitmap.createBitmap(bitmap,
74. 0,height/2,width,height/2,matrix,false);
76. BitmapbitmapWithReflection=Bitmap.createBitmap(width,(height+height/2),Config.ARGB_8888);
78. Canvascanvas=newCanvas(bitmapWithReflection);
79. canvas.drawBitmap(bitmap,0,0,null);
80. PaintdeafalutPaint=newPaint();
81. canvas.drawRect(0,height,width,height+reflectionGap,
82. deafalutPaint);
84. canvas.drawBitmap(reflectionImage,0,height+reflectionGap,null);
86. Paintpaint=newPaint();
87. LinearGradientshader=newLinearGradient(0,
88. bitmap.getHeight(),0,bitmapWithReflection.getHeight()
89. +reflectionGap,0x70ffffff,0x00ffffff,TileMode.CLAMP);
90. paint.setShader(shader);
91. //SettheTransfermodetobeporterduffanddestinationin
92. paint.setXfermode(newPorterDuffXfermode(Mode.DST_IN));
93. //Drawarectangleusingthepaintwithourlineargradient
94. canvas.drawRect(0,height,width,bitmapWithReflection.getHeight()
95. +reflectionGap,paint);
97. returnbitmapWithReflection;
98. }
100. }

package com.android.tutor; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.LinearGradient; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PixelFormat; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.Bitmap.Config; import android.graphics.PorterDuff.Mode; import android.graphics.Shader.TileMode; import android.graphics.drawable.Drawable; public class ImageUtil { //放大缩小图片 public static Bitmap zoomBitmap(Bitmap bitmap,int w,int h){ int width = bitmap.getWidth(); int height = bitmap.getHeight(); Matrix matrix = new Matrix(); float scaleWidht = ((float)w / width); float scaleHeight = ((float)h / height); matrix.postScale(scaleWidht, scaleHeight); Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true); return newbmp; } //将Drawable转化为Bitmap public static Bitmap drawableToBitmap(Drawable drawable){ int width = drawable.getIntrinsicWidth(); int height = drawable.getIntrinsicHeight(); Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565); Canvas canvas = new Canvas(bitmap); drawable.setBounds(0,0,width,height); drawable.draw(canvas); return bitmap; } //获得圆角图片的方法 public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){ Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap .getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xff424242; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); final RectF rectF = new RectF(rect); paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); return output; } //获得带倒影的图片方法 public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){ final int reflectionGap = 4; int width = bitmap.getWidth(); int height = bitmap.getHeight(); Matrix matrix = new Matrix(); matrix.preScale(1, -1); Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height/2, width, height/2, matrix, false); Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888); Canvas canvas = new Canvas(bitmapWithReflection); canvas.drawBitmap(bitmap, 0, 0, null); Paint deafalutPaint = new Paint(); canvas.drawRect(0, height,width,height + reflectionGap, deafalutPaint); canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null); Paint paint = new Paint(); LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP); paint.setShader(shader); // Set the Transfer mode to be porter duff and destination in paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); // Draw a rectangle using the paint with our linear gradient canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint); return bitmapWithReflection; } }

第三步:修改main.xml布局文件,主要放了两个ImageView控件,代码如下:

view plain print ?

1. <?xmlversion="1.0"encoding="utf-8"?>
2. <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="vertical"
4. android:layout_width="fill_parent"
5. android:layout_height="fill_parent"
6. >
7. <ImageView
8. android:id="@+id/image01"
9. android:layout_width="wrap_content"
10. android:layout_height="wrap_content"
11. android:padding="10px"
12. />
13. <ImageView
14. android:id="@+id/image02"
15. android:layout_width="wrap_content"
16. android:layout_height="wrap_content"
17. android:padding="10px"
18. />
19. </LinearLayout>

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ImageView android:id="@+id/image01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="10px" /> <ImageView android:id="@+id/image02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="10px" /> </LinearLayout>

第四步:修改主核心程序,ImageDemo.java,代码如下:

view plain print ?

1. packagecom.android.tutor;
2. importandroid.app.Activity;
3. importandroid.graphics.Bitmap;
4. importandroid.graphics.drawable.Drawable;
5. importandroid.os.Bundle;
6. importandroid.widget.ImageView;
7. publicclassImagedemoextendsActivity{
8. privateImageViewmImageView01,mImageView02;
10. publicvoidonCreate(BundlesavedInstanceState){
11. super.onCreate(savedInstanceState);
12. setContentView(R.layout.main);
13. setupViews();
14. }
16. privatevoidsetupViews(){
17. mImageView01=(ImageView)findViewById(R.id.image01);
18. mImageView02=(ImageView)findViewById(R.id.image02);
20. //获取壁纸返回值是Drawable
21. Drawabledrawable=getWallpaper();
22. //将Drawable转化为Bitmap
23. Bitmapbitmap=ImageUtil.drawableToBitmap(drawable);
24. //缩放图片
25. BitmapzoomBitmap=ImageUtil.zoomBitmap(bitmap,100,100);
26. //获取圆角图片
27. BitmaproundBitmap=ImageUtil.getRoundedCornerBitmap(zoomBitmap,10.0f);
28. //获取倒影图片
29. BitmapreflectBitmap=ImageUtil.createReflectionImageWithOrigin(zoomBitmap);
30. //这里可以让Bitmap再转化为Drawable
31. //DrawableroundDrawable=newBitmapDrawable(roundBitmap);
32. //DrawablereflectDrawable=newBitmapDrawable(reflectBitmap);
33. //mImageView01.setBackgroundDrawable(roundDrawable);
34. //mImageView02.setBackgroundDrawable(reflectDrawable);
36. mImageView01.setImageBitmap(roundBitmap);
37. mImageView02.setImageBitmap(reflectBitmap);
38. }
41. }

package com.android.tutor; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.widget.ImageView; public class Imagedemo extends Activity { private ImageView mImageView01,mImageView02; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); setupViews(); } private void setupViews(){ mImageView01 = (ImageView)findViewById(R.id.image01); mImageView02 = (ImageView)findViewById(R.id.image02); //获取壁纸返回值是Drawable Drawable drawable = getWallpaper(); //将Drawable转化为Bitmap Bitmap bitmap = ImageUtil.drawableToBitmap(drawable); //缩放图片 Bitmap zoomBitmap = ImageUtil.zoomBitmap(bitmap, 100, 100); //获取圆角图片 Bitmap roundBitmap = ImageUtil.getRoundedCornerBitmap(zoomBitmap, 10.0f); //获取倒影图片 Bitmap reflectBitmap = ImageUtil.createReflectionImageWithOrigin(zoomBitmap); //这里可以让Bitmap再转化为Drawable // Drawable roundDrawable = new BitmapDrawable(roundBitmap); // Drawable reflectDrawable = new BitmapDrawable(reflectBitmap); // mImageView01.setBackgroundDrawable(roundDrawable); // mImageView02.setBackgroundDrawable(reflectDrawable); mImageView01.setImageBitmap(roundBitmap); mImageView02.setImageBitmap(reflectBitmap); } }

第五步:运行上述工程,查看效果如下:

OK大功告成了!!

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