Android—将Bitmap图片保存到SD卡目录下或者指定目录

直接上代码就不废话啦

一：保存到SD卡下

File file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis()+".jpg");
    try {
            out = new FileOutputStream(file);
            btImage.compress(Bitmap.CompressFormat.JPEG, 90, out);
            System.out.println("___________保存的__sd___下_______________________");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        try {
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        Toast.makeText(HahItemActivity.this,"保存已经至"+Environment.getExternalStorageDirectory()+"下", Toast.LENGTH_SHORT).show();
     }

上面的方法就是 直接定义一个文件的路径，和图片的名称，然后保存.

二：保存Bitmap到指定的SD卡文件夹目录下

想想也知道，这个必须先有个文件夹，才能把图片保存这里面，那就按照思路学代码吧

if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) // 判断是否可以对SDcard进行操作
             {    // 获取SDCard指定目录下
                 String  sdCardDir = Environment.getExternalStorageDirectory()+ "/CoolImage/";
                 File dirFile  = new File(sdCardDir);  //目录转化成文件夹
                 if (!dirFile .exists()) {              //如果不存在，那就建立这个文件夹
                    dirFile .mkdirs();
                     }                          //文件夹有啦，就可以保存图片啦
                 File file = new File(sdCardDir, System.currentTimeMillis()+".jpg");// 在SDcard的目录下创建图片文,以当前时间为其命名

            try {
                out = new FileOutputStream(file);
                btImage.compress(Bitmap.CompressFormat.JPEG, 90, out);
                System.out.println("_________保存到____sd______指定目录文件夹下____________________");
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            try {
                out.flush();
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            Toast.makeText(HahItemActivity.this,"保存已经至"+Environment.getExternalStorageDirectory()+"/CoolImage/"+"目录文件夹下", Toast.LENGTH_SHORT).show();
         }

注：访问权限注意哦

<!-- 安卓读写sd权限 -->
 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
t;uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

关于图片的  SD卡的 
未完   待续

//将Bitmap图片保存到sd卡

   protected void saveBitmapToSD(Bitmap bt) {
       File path = Environment.getExternalStorageDirectory();
       File file = new File(path, System.currentTimeMillis() + ".jpg");
       System.out.println(Environment.getExternalStorageState() + "/Cool/" +"000000000000000000000000000");
       try {
           FileOutputStream  out = new FileOutputStream(file);
           bt.compress(Bitmap.CompressFormat.JPEG, 90, out);
       } catch (FileNotFoundException e) {
           e.printStackTrace();
       }
       out.flush();
       out.close();
   }

   /**
    * 保存bitmap到SD卡
    * @param bitName 保存的名字
    * @param mBitmap 图片对像
    * return 生成压缩图片后的图片路径
    */
   public static String saveMyBitmap(String bitName,Bitmap mBitmap) {
       File f = new File("/sdcard/" + bitName + ".png");
       try {
           f.createNewFile();
       } catch (IOException e) {
           System.out.println("在保存图片时出错：" + e.toString());
       }
       FileOutputStream fOut = null;
       try {
           fOut = new FileOutputStream(f);
       } catch (FileNotFoundException e) {
           e.printStackTrace();
       }
       try {
           mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
       } catch (Exception e) {
           return "create_bitmap_error";
       }
       try {
           fOut.flush();
       } catch (IOException e) {
           e.printStackTrace();
       }
       try {
           fOut.close();
       } catch (IOException e) {
           e.printStackTrace();
       }

       return "/sdcard/" + bitName + ".png";
   }

   /**
    * 保存bitmap到SD卡
    * @param bitmap
    * @param imagename
    */
   public static String saveBitmapToSDCard(Bitmap bitmap, String imagename) {
       String path = "/sdcard/" + "img-" + imagename + ".jpg";
       FileOutputStream fos = null;
       try {
           fos = new FileOutputStream(path);
           if (fos != null) {
               bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos);
               fos.close();
           }

           return path;
       } catch (Exception e) {
           e.printStackTrace();
       }
       return null;
   }