获取总内存？

ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);ActivityManager.MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();activityManager.getMemoryInfo(memoryInfo);//获取总内存long totalMem = memoryInfo.totalMem;

---

注意：上面是新版本的API，不能直接跑到低版本的手机上面，如果想要向下兼容，得用以下的代码，通过读文件的方式。

try {            FileInputStream fileInputStream = new FileInputStream(new File("/proc/meminfo"));            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(fileInputStream));            String line = bufferedReader.readLine();            StringBuilder stringBuilder = new StringBuilder();            for (char c:line.toCharArray()) {                if (c>='0'&&c<='9'){                    stringBuilder.append(c);                }            }            //总内存(乘以1024是为了方面格式化为MB)            long totalMem = Long.parseLong(stringBuilder.toString())*1024;        } catch (Exception e) {            e.printStackTrace();        }