Android 中SD卡是否存在以及剩余空间的大小查询

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卡总内存：

public long getSDAllSize(){

File path = Environment.getExternalStorageDirectory();

StatFs sf = new StatFs(path.getPath());

long blockSize = sf.getBlockSize();

long allBlocks = sf.getBlockCount();

return (allBlocks * blockSize)/1024/1024; //单位MB

}

SD卡剩余内存大小

public long getSDFreeSize(){

File path = Environment.getExternalStorageDirectory();

StatFs sf = new StatFs(path.getPath());

long blockSize = sf.getBlockSize();

long freeBlocks = sf.getAvailableBlocks();

return (freeBlocks * blockSize)/1024 /1024; //单位MB

}

最后要在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"/>

<!-- 往SDCard读数据权限 -->

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>