我正在制作一个.txt
在内部存储中保存 2MB 文件的 android 应用程序。如何知道内部存储是否已满,从而将文件保存到外部存储?
问问题
1012 次
3 回答
3
快速搜索后,我找到了以下方法。您可以从StatFs类中获取它。此类用于检索有关文件系统空间的整体信息。
public int FreeMemory()
{
StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());
int Free = (statFs.getAvailableBlocks() * statFs.getBlockSize()) / 1048576;
return Free;
}
也可以通过以下方式找到
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return Formatter.formatFileSize(this, availableBlocks * blockSize);
我希望这能帮到您。谢谢你。
于 2013-05-23T09:47:07.723 回答
1
请检查以下代码(我已经在这个网站上复制了它,但我不记得它到底在哪里)
public static boolean externalMemoryAvailable() {
return android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
}
public static String getAvailableInternalMemorySize() {
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return formatSize(availableBlocks * blockSize);
}
public static String getTotalInternalMemorySize() {
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long totalBlocks = stat.getBlockCount();
return formatSize(totalBlocks * blockSize);
}
public static String getAvailableExternalMemorySize() {
if (externalMemoryAvailable()) {
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return formatSize(availableBlocks * blockSize);
} else {
return ERROR;
}
}
public static String getTotalExternalMemorySize() {
if (externalMemoryAvailable()) {
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long totalBlocks = stat.getBlockCount();
return formatSize(totalBlocks * blockSize);
} else {
return ERROR;
}
}
public static String formatSize(long size) {
String suffix = null;
if (size >= 1024) {
suffix = "KB";
size /= 1024;
if (size >= 1024) {
suffix = "MB";
size /= 1024;
}
}
StringBuilder resultBuffer = new StringBuilder(Long.toString(size));
int commaOffset = resultBuffer.length() - 3;
while (commaOffset > 0) {
resultBuffer.insert(commaOffset, ',');
commaOffset -= 3;
}
if (suffix != null) resultBuffer.append(suffix);
return resultBuffer.toString();
}
希望帮助你。
于 2013-05-23T11:02:49.197 回答
0
你试过float freeSpace = DeviceMemory.getInternalFreeSpace();
吗?
于 2013-05-23T09:35:17.520 回答