Android SD卡帮助类

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package com.example.retrofitdemo;import android.content.Context;import android.os.Environment;import android.os.StatFs;import android.util.Log;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;public class SDCardHelper {   // 判断SD卡是否被挂载   public static boolean isSDCardMounted() {      // return Environment.getExternalStorageState().equals("mounted");      return Environment.getExternalStorageState().equals(            Environment.MEDIA_MOUNTED);   }   // 获取SD卡的跟路径   public static String getSDCardBaseDir() {      if (isSDCardMounted()) {         return Environment.getExternalStorageDirectory().getAbsolutePath();      }      return "";   }   // 获取SD卡的完整空间大小，返回MB   public static long getSDCardSize() {      if (isSDCardMounted()) {         StatFs fs = new StatFs(getSDCardBaseDir());         int count = fs.getBlockCount();         int size = fs.getBlockSize();         return count * size / 1024 / 1024;      }      return 0;   }   // 获取SD卡的剩余空间大小，返回MB   public static long getSDCardFreeSize() {      if (isSDCardMounted()) {         StatFs fs = new StatFs(getSDCardBaseDir());         int count = fs.getFreeBlocks();         int size = fs.getBlockSize();         return count * size / 1024 / 1024;      }      return 0;   }   // 获取SD卡的可用空间大小，返回MB   public static long getSDCardAvailableSize() {      if (isSDCardMounted()) {         StatFs fs = new StatFs(getSDCardBaseDir());         int count = fs.getAvailableBlocks();         int size = fs.getBlockSize();         return count * size / 1024 / 1024;      }      return 0;   }   // 往SD卡的公有目录下保存文件   public static boolean saveFileToSDCardPublicDir(byte[] data, String type,         String fileName) {      BufferedOutputStream bos = null;      if (isSDCardMounted()) {         File file = Environment               .getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES);         // Log.i("SDCardHelper", "--->" + file.getAbsolutePath());         try {            bos = new BufferedOutputStream(new FileOutputStream(new File(                  file, fileName)));            bos.write(data);            bos.flush();            return true;         } catch (Exception e) {            e.printStackTrace();         } finally {            try {               if (bos != null) {                  bos.close();               }            } catch (IOException e) {               e.printStackTrace();            }         }      }      return false;   }   // 往SD卡的私有Files目录下保存文件   public static boolean saveFileToSDCardPrivateFilesDir(byte[] data,                                            String type, String fileName, Context context) {      BufferedOutputStream bos = null;      if (isSDCardMounted()) {         File file = context.getExternalFilesDir(type);         try {            bos = new BufferedOutputStream(new FileOutputStream(new File(                  file, fileName)));            bos.write(data);            bos.flush();            return true;         } catch (Exception e) {            e.printStackTrace();         } finally {            try {               if (bos != null) {                  bos.close();               }            } catch (IOException e) {               e.printStackTrace();            }         }      }      return false;   }   // 往SD卡的私有Cache目录下保存文件   public static boolean saveFileToSDCardPrivateCacheDir(byte[] data,                                            String fileName, Context context) {      BufferedOutputStream bos = null;      if (isSDCardMounted()) {         File file = context.getExternalCacheDir();         try {            bos = new BufferedOutputStream(new FileOutputStream(new File(                  file, fileName)));            bos.write(data);            bos.flush();            return true;         } catch (Exception e) {            e.printStackTrace();         } finally {            try {               if (bos != null) {                  bos.close();               }            } catch (IOException e) {               e.printStackTrace();            }         }      }      return false;   }   // 往SD卡的私有Cache目录下保存文件   public static boolean saveFileToSDCardPrivateCacheDir(InputStream in,                                            String fileName, Context context) {      BufferedOutputStream bos = null;      BufferedInputStream  bis=null;      if (isSDCardMounted()) {         File file = context.getExternalCacheDir();         String absolutePath = context.getExternalCacheDir().getAbsolutePath();         Log.e("TAG", "saveFileToSDCardPrivateCacheDir: "+absolutePath );         try {            bis=new BufferedInputStream(in);            bos = new BufferedOutputStream(new FileOutputStream(new File(                  file, fileName)));            byte[] buffer=new byte[1024*8];            int c=0;            while((c=bis.read(buffer))!=-1){               bos.write(buffer,0,c);               bos.flush();            }            return true;         } catch (Exception e) {            e.printStackTrace();         } finally {            try {               if (bos != null) {                  bos.close();               }               if(bis!=null){                  bis.close();               }            } catch (IOException e) {               e.printStackTrace();            }         }      }      return false;   }   // 往SD卡的自定义目录下保存文件   public static boolean saveFileToSDCardCustomDir(byte[] data, String dir,         String fileName) {      BufferedOutputStream bos = null;      if (isSDCardMounted()) {         File file = new File(getSDCardBaseDir() + File.separator + dir);         if (!file.exists()) {            file.mkdirs();         }         try {            bos = new BufferedOutputStream(new FileOutputStream(new File(            file, fileName)));            bos.write(data);            bos.flush();            return true;         } catch (Exception e) {            e.printStackTrace();         } finally {            try {               if (bos != null) {                  bos.close();               }            } catch (IOException e) {               e.printStackTrace();            }         }      }      return false;   }   // 从SD卡获取文件   public static byte[] loadFileFromSDCard(String filePath) {      BufferedInputStream bis = null;      ByteArrayOutputStream baos = new ByteArrayOutputStream();      try {         bis = new BufferedInputStream(new FileInputStream(               new File(filePath)));         byte[] buffer = new byte[1024 * 8];         int c = 0;         while ((c = bis.read(buffer)) != -1) {            baos.write(buffer, 0, c);            baos.flush();         }         return baos.toByteArray();      } catch (Exception e) {         e.printStackTrace();      } finally {         try {            if (bis != null) {               bis.close();            }            if (baos != null) {               baos.close();            }         } catch (IOException e) {            e.printStackTrace();         }      }      return null;   }   // 获取SD卡公有目录的路径   public static String getSDCardPublicDir(String type) {      return Environment.getExternalStoragePublicDirectory(type)            .getAbsolutePath();   }   // 获取SD卡私有Cache目录的路径   public static String getSDCardPrivateCacheDir(Context context) {      return context.getExternalCacheDir().getAbsolutePath();   }   // 获取SD卡私有Files目录的路径   public static String getSDCardPrivateFilesDir(Context context, String type) {      return context.getExternalFilesDir(type).getAbsolutePath();   }}
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