Android(安卓)判断SD卡是否存在及容量查询
16lz
2021-12-04
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; }
SD卡剩余空间
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
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 }
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