Android中几种图片特效的处理

绝地灬酷狼 2022-06-11 00:49 207阅读 0赞

**\[java\]**  [view plain][]   [copy][view plain]

1.  **package** com.android.tutor;  
2.  **import** android.graphics.Bitmap;  
3.  **import** android.graphics.Canvas;  
4.  **import** android.graphics.LinearGradient;  
5.  **import** android.graphics.Matrix;  
6.  **import** android.graphics.Paint;  
7.  **import** android.graphics.PixelFormat;  
8.  **import** android.graphics.PorterDuffXfermode;  
9.  **import** android.graphics.Rect;  
10. **import** android.graphics.RectF;  
11. **import** android.graphics.Bitmap.Config;  
12. **import** android.graphics.PorterDuff.Mode;  
13. **import** android.graphics.Shader.TileMode;  
14. **import** android.graphics.drawable.Drawable;  
15. **public** **class** ImageUtil \{  
16.       
17.     //放大缩小图片  
18.     **public** **static** Bitmap zoomBitmap(Bitmap bitmap,**int** w,**int** h)\{  
19.         **int** width = bitmap.getWidth();  
20.         **int** height = bitmap.getHeight();  
21.         Matrix matrix = **new** Matrix();  
22.         **float** scaleWidht = ((**float**)w / width);  
23.         **float** scaleHeight = ((**float**)h / height);  
24.         matrix.postScale(scaleWidht, scaleHeight);  
25.         Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, **true**);  
26.         **return** newbmp;  
27.     \}  
28.     //将Drawable转化为Bitmap  
29.      **public** **static** Bitmap drawableToBitmap(Drawable drawable)\{  
30.             **int** width = drawable.getIntrinsicWidth();  
31.             **int** height = drawable.getIntrinsicHeight();  
32.             Bitmap bitmap = Bitmap.createBitmap(width, height,  
33.                     drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB\_8888  
34.                             : Bitmap.Config.RGB\_565);  
35.             Canvas canvas = **new** Canvas(bitmap);  
36.             drawable.setBounds(0,0,width,height);  
37.             drawable.draw(canvas);  
38.             **return** bitmap;  
39.               
40.         \}  
41.        
42.      //获得圆角图片的方法  
43.     **public** **static** Bitmap getRoundedCornerBitmap(Bitmap bitmap,**float** roundPx)\{  
44.           
45.         Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap  
46.                 .getHeight(), Config.ARGB\_8888);  
47.         Canvas canvas = **new** Canvas(output);  
48.    
49.         **final** **int** color = 0xff424242;  
50.         **final** Paint paint = **new** Paint();  
51.         **final** Rect rect = **new** Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());  
52.         **final** RectF rectF = **new** RectF(rect);  
53.    
54.         paint.setAntiAlias(**true**);  
55.         canvas.drawARGB(0, 0, 0, 0);  
56.         paint.setColor(color);  
57.         canvas.drawRoundRect(rectF, roundPx, roundPx, paint);  
58.    
59.         paint.setXfermode(**new** PorterDuffXfermode(Mode.SRC\_IN));  
60.         canvas.drawBitmap(bitmap, rect, rect, paint);  
61.    
62.         **return** output;  
63.     \}  
64.     //获得带倒影的图片方法  
65.     **public** **static** Bitmap createReflectionImageWithOrigin(Bitmap bitmap)\{  
66.         **final** **int** reflectionGap = 4;  
67.         **int** width = bitmap.getWidth();  
68.         **int** height = bitmap.getHeight();  
69.           
70.         Matrix matrix = **new** Matrix();  
71.         matrix.preScale(1, -1);  
72.           
73.         Bitmap reflectionImage = Bitmap.createBitmap(bitmap,   
74.                 0, height/2, width, height/2, matrix, **false**);  
75.           
76.         Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB\_8888);  
77.           
78.         Canvas canvas = **new** Canvas(bitmapWithReflection);  
79.         canvas.drawBitmap(bitmap, 0, 0, **null**);  
80.         Paint deafalutPaint = **new** Paint();  
81.         canvas.drawRect(0, height,width,height + reflectionGap,  
82.                 deafalutPaint);  
83.           
84.         canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, **null**);  
85.           
86.         Paint paint = **new** Paint();  
87.         LinearGradient shader = **new** LinearGradient(0,  
88.                 bitmap.getHeight(), 0, bitmapWithReflection.getHeight()  
89.                 + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);  
90.         paint.setShader(shader);  
91.         // Set the Transfer mode to be porter duff and destination in  
92.         paint.setXfermode(**new** PorterDuffXfermode(Mode.DST\_IN));  
93.         // Draw a rectangle using the paint with our linear gradient  
94.         canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()  
95.                 + reflectionGap, paint);  
96.    
97.         **return** bitmapWithReflection;  
98.     \}  
99.       
100. \}

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

**\[java\]**  [view plain][]   [copy][view plain]

1.  <?xml version="1.0" encoding="utf-8"?>  
2.  <LinearLayout xmlns: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>

第四步:修改主核心程序,ImageDemo.java,代码如下:

**\[java\]**  [view plain][]   [copy][view plain]

1.  **package** com.android.tutor;  
2.  **import** android.app.Activity;  
3.  **import** android.graphics.Bitmap;  
4.  **import** android.graphics.drawable.Drawable;  
5.  **import** android.os.Bundle;  
6.  **import** android.widget.ImageView;  
7.  **public** **class** Imagedemo **extends** Activity \{  
8.      **private** ImageView mImageView01,mImageView02;  
9.        
10.     **public** **void** onCreate(Bundle savedInstanceState) \{  
11.         **super**.onCreate(savedInstanceState);  
12.         setContentView(R.layout.main);  
13.         setupViews();  
14.     \}  
15.      
16.     **private** **void** setupViews()\{  
17.         mImageView01 = (ImageView)findViewById(R.id.image01);  
18.         mImageView02 = (ImageView)findViewById(R.id.image02);  
19.           
20.         //获取壁纸返回值是Drawable  
21.         Drawable drawable = getWallpaper();  
22.         //将Drawable转化为Bitmap  
23.         Bitmap bitmap = ImageUtil.drawableToBitmap(drawable);  
24.         //缩放图片  
25.         Bitmap zoomBitmap = ImageUtil.zoomBitmap(bitmap, 100, 100);  
26.         //获取圆角图片  
27.         Bitmap roundBitmap = ImageUtil.getRoundedCornerBitmap(zoomBitmap, 10.0f);  
28.         //获取倒影图片  
29.         Bitmap reflectBitmap = ImageUtil.createReflectionImageWithOrigin(zoomBitmap);  
30.         //这里可以让Bitmap再转化为Drawable  
31. //      Drawable roundDrawable = new BitmapDrawable(roundBitmap);         
32. //      Drawable reflectDrawable = new BitmapDrawable(reflectBitmap);         
33. //      mImageView01.setBackgroundDrawable(roundDrawable);  
34. //      mImageView02.setBackgroundDrawable(reflectDrawable);  
35.                   
36.         mImageView01.setImageBitmap(roundBitmap);  
37.         mImageView02.setImageBitmap(reflectBitmap);  
38.     \}  
39.         
40.          
41. \}

[view plain]: http://blog.csdn.net/android_tutor/article/details/5981753#