1 forms 接口定义
2
3 using System;
4 using System.Collections.Generic;
5 using System.IO;
6
7 namespace
8 {
9 public interface IUtilPicture
10 {
11 List<string> ResizeBitmap(string imagePath); //图片采样缩小
12 //删除图片
13 void DeletePicture(string imagePath);
14 }
15 }
16
17
18 平台实现
19 using System;
20 using System.Collections.Generic;
21 using System.IO;
22 using System.Diagnostics;
23
24 using Xamarin.Forms;
25
26 using.TDroid;
27
28 using Android.Graphics;
29
30 [assembly:Dependency (typeof(UtilPicture))]
31 namespace.TDroid
32 {
33 public class UtilPicture : Java.Lang.Object,IUtilPicture
34 {
35 public UtilPicture ()
36 {
37
38 }
39
40 public List<string> ResizeBitmap (string imagePath)
41 {
42 List<string> listImagePath = new List<string> ();
43 BitmapFactory.Options newOptions = new BitmapFactory.Options ();
44 //开始du图片
45 newOptions.InJustDecodeBounds = true;
46 Bitmap bitmap = BitmapFactory.DecodeFile (imagePath, newOptions);
47 newOptions.InJustDecodeBounds = false;
48 int be = calculateInSampleSize (newOptions,700,700);
49 newOptions.InSampleSize = be;
50 bitmap = BitmapFactory.DecodeFile (imagePath, newOptions);
51 Bitmap tempBitOne = compressImage (bitmap,60);
52 bitmap.Recycle ();
53 string shinkOne = SaveCompressImage (tempBitOne, imagePath,"");
54 listImagePath.Add (shinkOne);
55 string shinkTwo = SaveShinkImage (shinkOne);
56 listImagePath.Add (shinkTwo);
57 return listImagePath;
58 }
59
60
61 public void DeletePicture (string imagePath)
62 {
63 if (File.Exists (imagePath)) {
64 try {
65 File.Delete (imagePath);
66 } catch (IOException ex) {
67 Debug.WriteLine ("DeleteFile:" + ex.Message);
68 return;
69 }
70 }
71 }
72
73 private Bitmap compressImage (Bitmap bitmap,int byteCount)
74 {
75 MemoryStream mStrean = new MemoryStream ();
76 bitmap.Compress (Bitmap.CompressFormat.Jpeg, 100, mStrean);
77 int options = 100;
78 while (mStrean.ToArray ().Length / 1024 > byteCount) {
79 mStrean.SetLength (0);
80 mStrean.Position = 0;
81 bitmap.Compress (Bitmap.CompressFormat.Jpeg, options, mStrean);
82 options -= 10;
83 }
84 bitmap.Recycle ();
85 Bitmap tempBit = BitmapFactory.DecodeByteArray (mStrean.ToArray (), 0, mStrean.ToArray ().Length);
86 mStrean.SetLength (0);
87 mStrean.Position = 0;
88 return tempBit;
89 }
90
91 private string SaveCompressImage (Bitmap mBitmap, string path,string fileShink) //上传图片
92 {
93 MemoryStream mStrean = new MemoryStream ();
94 mBitmap.Compress (Bitmap.CompressFormat.Jpeg, 100, mStrean);
95 var image1Path = Environment.GetFolderPath (Environment.SpecialFolder.Personal);
96 ///data/data/PocketDoctor.TDroid/files
97 string mPath = Android.OS.Environment.ExternalStorageDirectory + "/FDEKYYYG/MemoImages";
98 mPath += fileShink;
99 if (!Directory.Exists (mPath)) {
100 Directory.CreateDirectory (mPath);
101 }
102 string fileName = path.Substring (path.LastIndexOf ('/') + 1);
103 string imageFilePath = mPath + "/" + fileName;
104 FileInfo fileInfo;
105 fileInfo = new FileInfo (imageFilePath);
106 try {
107 FileStream fStream = fileInfo.Create ();
108 fStream.Write (mStrean.ToArray (), 0, mStrean.ToArray ().Length);
109 mStrean.SetLength (0);
110 mStrean.Position = 0;
111 fStream.Close ();
112 mBitmap.Recycle ();
113 } catch (Exception ex) {
114 Debug.WriteLine ("DeleteFile:" + ex.Message);
115 }
116 return imageFilePath;
117 }
118
119 private string SaveShinkImage (string imagePath) //缩略图
120 {
121 BitmapFactory.Options newOptions = new BitmapFactory.Options ();
122 //开始du图片
123 newOptions.InJustDecodeBounds = true;
124 Bitmap bitmap = BitmapFactory.DecodeFile (imagePath, newOptions);
125 newOptions.InJustDecodeBounds = false;
126 int beTwo = calculateInSampleSize (newOptions,70,70);
127 newOptions.InSampleSize = beTwo;
128 bitmap = BitmapFactory.DecodeFile (imagePath, newOptions);
129 Bitmap tempBitTwo = compressImage (bitmap,5);
130 bitmap.Recycle ();
131 string shinkOne = SaveCompressImage (tempBitTwo, imagePath,"Thumbnail");
132 return shinkOne;
133 }
134
135 private int calculateInSampleSize (
136 BitmapFactory.Options options, int reqWidth, int reqHeight)
137 {
138 // Raw height and width of image
139 int height = options.OutHeight;
140 int width = options.OutWidth;
141 int inSampleSize = 1;
142
143 if (height > reqHeight || width > reqWidth) {
144
145 int halfHeight = height / 2;
146 int halfWidth = width / 2;
147
148 // Calculate the largest inSampleSize value that is a power of 2 and keeps both
149 // height and width larger than the requested height and width.
150 while ((halfHeight / inSampleSize) > reqHeight
151 && (halfWidth / inSampleSize) > reqWidth) {
152 inSampleSize *= 2;
153 }
154 }
155 return inSampleSize;
156 }
157
158 }
159 }
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