Android - 如何在低设备内存(内部/外部内存)上处理保存文件

Question

我们如何处理低设备内存(内部/外部存储器)上的文件保存.我知道如果没有足够的空间,操作系统将抛出IOException,但有没有办法优雅地处理它.

Answer 1

首先找到内部和外部存储空间的可用空间..然后检查您的文件大小小于可用内存（根据您的要求选择内部或外部）然后存储否则消息警报显示...如果您需要格式大小然后使用功能格式大小....

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 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 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();
    }

谢谢