android判断sd卡是否存在
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
<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"/>
<!-- 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
if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED)) {
return true;
} else
return false;
}
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
//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 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
//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
}