1 public class SDCardHelper {
2
3 // 判断SD卡是否被挂载
4 public static boolean isSDCardMounted() {
5 // return Environment.getExternalStorageState().equals("mounted");
6 return Environment.getExternalStorageState().equals(
7 Environment.MEDIA_MOUNTED);
8 }
9
10 // 获取SD卡的根目录
11 public static String getSDCardBaseDir() {
12 if (isSDCardMounted()) {
13 return Environment.getExternalStorageDirectory().getAbsolutePath();
14 }
15 return null;
16 }
17
18 // 获取SD卡的完整空间大小，返回MB
19 public static long getSDCardSize() {
20 if (isSDCardMounted()) {
21 StatFs fs = new StatFs(getSDCardBaseDir());
22 long count = fs.getBlockCountLong();
23 long size = fs.getBlockSizeLong();
24 return count * size / 1024 / 1024;
25 }
26 return 0;
27 }
28
29 // 获取SD卡的剩余空间大小
30 public static long getSDCardFreeSize() {
31 if (isSDCardMounted()) {
32 StatFs fs = new StatFs(getSDCardBaseDir());
33 long count = fs.getFreeBlocksLong();
34 long size = fs.getBlockSizeLong();
35 return count * size / 1024 / 1024;
36 }
37 return 0;
38 }
39
40 // 获取SD卡的可用空间大小
41 public static long getSDCardAvailableSize() {
42 if (isSDCardMounted()) {
43 StatFs fs = new StatFs(getSDCardBaseDir());
44 long count = fs.getAvailableBlocksLong();
45 long size = fs.getBlockSizeLong();
46 return count * size / 1024 / 1024;
47 }
48 return 0;
49 }
50
51 // 往SD卡的公有目录下保存文件
52 public static boolean saveFileToSDCardPublicDir(byte[] data, String type, String fileName) {
53 BufferedOutputStream bos = null;
54 if (isSDCardMounted()) {
55 File file = Environment.getExternalStoragePublicDirectory(type);
56 try {
57 bos = new BufferedOutputStream(new FileOutputStream(new File(file, fileName)));
58 bos.write(data);
59 bos.flush();
60 return true;
61 } catch (Exception e) {
62 e.printStackTrace();
63 } finally {
64 try {
65 bos.close();
66 } catch (IOException e) {
67 // TODO Auto-generated catch block
68 e.printStackTrace();
69 }
70 }
71 }
72 return false;
73 }
74
75 // 往SD卡的自定义目录下保存文件
76 public static boolean saveFileToSDCardCustomDir(byte[] data, String dir, String fileName) {
77 BufferedOutputStream bos = null;
78 if (isSDCardMounted()) {
79 File file = new File(getSDCardBaseDir() + File.separator + dir);
80 if (!file.exists()) {
81 file.mkdirs();// 递归创建自定义目录
82 }
83 try {
84 bos = new BufferedOutputStream(new FileOutputStream(new File(file, fileName)));
85 bos.write(data);
86 bos.flush();
87 return true;
88 } catch (Exception e) {
89 e.printStackTrace();
90 } finally {
91 try {
92 bos.close();
93 } catch (IOException e) {
94 // TODO Auto-generated catch block
95 e.printStackTrace();
96 }
97 }
98 }
99 return false;
100 }
101
102 // 往SD卡的私有Files目录下保存文件
103 public static boolean saveFileToSDCardPrivateFilesDir(byte[] data, String type, String fileName, Context context) {
104 BufferedOutputStream bos = null;
105 if (isSDCardMounted()) {
106 File file = context.getExternalFilesDir(type);
107 try {
108 bos = new BufferedOutputStream(new FileOutputStream(new File(file, fileName)));
109 bos.write(data);
110 bos.flush();
111 return true;
112 } catch (Exception e) {
113 e.printStackTrace();
114 } finally {
115 try {
116 bos.close();
117 } catch (IOException e) {
118 // TODO Auto-generated catch block
119 e.printStackTrace();
120 }
121 }
122 }
123 return false;
124 }
125
126 // 往SD卡的私有Cache目录下保存文件
127 public static boolean saveFileToSDCardPrivateCacheDir(byte[] data, String fileName, Context context) {
128 BufferedOutputStream bos = null;
129 if (isSDCardMounted()) {
130 File file = context.getExternalCacheDir();
131 try {
132 bos = new BufferedOutputStream(new FileOutputStream(new File(file, fileName)));
133 bos.write(data);
134 bos.flush();
135 return true;
136 } catch (Exception e) {
137 e.printStackTrace();
138 } finally {
139 try {
140 bos.close();
141 } catch (IOException e) {
142 // TODO Auto-generated catch block
143 e.printStackTrace();
144 }
145 }
146 }
147 return false;
148 }
149
150 // 保存bitmap图片到SDCard的私有Cache目录
151 public static boolean saveBitmapToSDCardPrivateCacheDir(Bitmap bitmap, String fileName, Context context) {
152 if (isSDCardMounted()) {
153 BufferedOutputStream bos = null;
154 // 获取私有的Cache缓存目录
155 File file = context.getExternalCacheDir();
156
157 try {
158 bos = new BufferedOutputStream(new FileOutputStream(new File(file, fileName)));
159 if (fileName != null && (fileName.contains(".png") || fileName.contains(".PNG"))) {
160 bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos);
161 } else {
162 bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
163 }
164 bos.flush();
165 } catch (Exception e) {
166 e.printStackTrace();
167 } finally {
168 if (bos != null) {
169 try {
170 bos.close();
171 } catch (IOException e) {
172 e.printStackTrace();
173 }
174 }
175 }
176 return true;
177 } else {
178 return false;
179 }
180 }
181
182 // 从SD卡获取文件
183 public static byte[] loadFileFromSDCard(String fileDir) {
184 BufferedInputStream bis = null;
185 ByteArrayOutputStream baos = new ByteArrayOutputStream();
186
187 try {
188 bis = new BufferedInputStream(new FileInputStream(new File(fileDir)));
189 byte[] buffer = new byte[8 * 1024];
190 int c = 0;
191 while ((c = bis.read(buffer)) != -1) {
192 baos.write(buffer, 0, c);
193 baos.flush();
194 }
195 return baos.toByteArray();
196 } catch (Exception e) {
197 e.printStackTrace();
198 } finally {
199 try {
200 baos.close();
201 bis.close();
202 } catch (IOException e) {
203 e.printStackTrace();
204 }
205 }
206 return null;
207 }
208
209 // 从SDCard中寻找指定目录下的文件，返回Bitmap
210 public Bitmap loadBitmapFromSDCard(String filePath) {
211 byte[] data = loadFileFromSDCard(filePath);
212 if (data != null) {
213 Bitmap bm = BitmapFactory.decodeByteArray(data, 0, data.length);
214 if (bm != null) {
215 return bm;
216 }
217 }
218 return null;
219 }
220
221 // 获取SD卡公有目录的路径
222 public static String getSDCardPublicDir(String type) {
223 return Environment.getExternalStoragePublicDirectory(type).toString();
224 }
225
226 // 获取SD卡私有Cache目录的路径
227 public static String getSDCardPrivateCacheDir(Context context) {
228 return context.getExternalCacheDir().getAbsolutePath();
229 }
230
231 // 获取SD卡私有Files目录的路径
232 public static String getSDCardPrivateFilesDir(Context context, String type) {
233 return context.getExternalFilesDir(type).getAbsolutePath();
234 }
235
236 public static boolean isFileExist(String filePath) {
237 File file = new File(filePath);
238 return file.isFile();
239 }
240
241 // 从sdcard中删除文件
242 public static boolean removeFileFromSDCard(String filePath) {
243 File file = new File(filePath);
244 if (file.exists()) {
245 try {
246 file.delete();
247 return true;
248 } catch (Exception e) {
249 return false;
250 }
251 } else {
252 return false;
253 }
254 }
255 }