How to get total RAM size of a device?

Question

I want to get full RAM size of a device. memoryInfo.getTotalPss() returns 0. There is not function for get total RAM size in ActivityManager.MemoryInfo.

Answer 1

Simple method to get the total and available RAM are given below:

//Method call returns the free RAM currently and returned value is in bytes.
Runtime.getRuntime().freeMemory();

//Method call returns the total RAM currently and returned value is in bytes.
Runtime.getRuntime().maxMemory();

Hope this will work.

For formatting the value to KB and MB, the following method can be used :

/**
     * Method to format the given long value in human readable value of memory.
     * i.e with suffix as KB and MB and comma separated digits.
     *
     * @param size Total size in long to be formatted. Unit of input value is assumed as bytes.
     * @return String the formatted value. e.g for input value 1024 it will return 1KB.
     * 
 For the values less than 1KB i.e. same input value will return back. e.g. for input 900 the return value will be 900.
     */
    private 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();
    }

The method body can be customised to get desirable results.