Android 判断SD卡是否存在及容量查询 分类： Android数据存储 2014-06-20 13:32 66人阅读 评论(0) 收藏

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

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<!-- 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

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private boolean ExistSDCard() {

if (android.os.Environment.getExternalStorageState().equals(

android.os.Environment.MEDIA_MOUNTED)) {

return true;

} else

return false;

}

SD卡剩余空间

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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

}

SD卡总容量

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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

}