Android 判断SD卡是否存在及容量查询的简单方法如下:
首先要在AndroidManifest.xml中增加SD卡访问权限
- <!-- 在SDCard中创建与删除文件权限 -->
- <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
- <!-- 往SDCard写入数据权限 -->
- <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
SD卡是否存在
- private boolean ExistSDCard() {
- if (android.os.Environment.getExternalStorageState().equals(
- android.os.Environment.MEDIA_MOUNTED)) {
- return true;
- } else
- return false;
- }
- public long getSDFreeSize(){
- //取得SD卡文件路径
- File path = Environment.getExternalStorageDirectory();
- StatFs sf = new StatFs(path.getPath());
- //获取单个数据块的大小(Byte)
- long blockSize = sf.getBlockSize();
- //空闲的数据块的数量
- long freeBlocks = sf.getAvailableBlocks();
- //返回SD卡空闲大小
- //return freeBlocks * blockSize; //单位Byte
- //return (freeBlocks * blockSize)/1024; //单位KB
- return (freeBlocks * blockSize)/1024 /1024; //单位MB
- }
- public long getSDAllSize(){
- //取得SD卡文件路径
- File path = Environment.getExternalStorageDirectory();
- StatFs sf = new StatFs(path.getPath());
- //获取单个数据块的大小(Byte)
- long blockSize = sf.getBlockSize();
- //获取所有数据块数
- long allBlocks = sf.getBlockCount();
- //返回SD卡大小
- //return allBlocks * blockSize; //单位Byte
- //return (allBlocks * blockSize)/1024; //单位KB
- return (allBlocks * blockSize)/1024/1024; //单位MB
- }