Android读取设备内存大小

获取系统运行内存(RAM)大小：

 public static String getRAMTotalMemorySize(final Context context){
                //获得ActivityManager服务的对象
                ActivityManager mActivityManager = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
                //获得MemoryInfo对象
                ActivityManager.MemoryInfo memoryInfo = new ActivityManager.MemoryInfo() ;
                //获得系统可用内存，保存在MemoryInfo对象上
                mActivityManager.getMemoryInfo(memoryInfo) ;
                long memSize = memoryInfo.totalMem ;
                //字符类型转换
                String availMemStr = formateFileSize(context,memSize);
               return availMemStr ;

    }

获取系统可用运行内存(RAM)大小：
 

 public static String getRAMAvaialbeMemorySize(final Context context){
                //获得MemoryInfo对象
                ActivityManager  mActivityManager = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
                ActivityManager.MemoryInfo memoryInfo = new ActivityManager.MemoryInfo() ;
                //获得系统可用内存，保存在MemoryInfo对象上
                mActivityManager.getMemoryInfo(memoryInfo) ;
                long memSize = memoryInfo.availMem ;
                //字符类型转换
                String availMemStr = formateFileSize(context,memSize);
                return availMemStr ;

    }

获取系统存储空间（ROM）大小:
 

 public static String getROMTotalSize(final Context context) {
                File path = Environment.getExternalStorageDirectory();
                StatFs stat = new StatFs(path.getPath());
                long blockSize = stat.getBlockSize();
                long totalBlocks = stat.getBlockCount();
                String availMemStr = formateFileSize(context, blockSize * totalBlocks);
                return availMemStr ;

    }

获取系统可用存储空间（ROM）大小:

 public static String getROMAvailableSize(final Context context) {
                File path = Environment.getExternalStorageDirectory();
                StatFs stat = new StatFs(path.getPath());
                long blockSize = stat.getBlockSize();
                long availableBlocks = stat.getAvailableBlocks();
                String availMemStr = formateFileSize(context, blockSize * availableBlocks);
                return availMemStr ;

    }

    //调用系统函数，字符串转换 long -String KB/MB
    public static String formateFileSize(Context context,long size){
        return Formatter.formatFileSize(context, size);
    }