75.android 简单的获取当前可用运行内存，总运行内存，获取包含系统软件在内的所有内存，获取系统参数显示的内存大小。

 1.获取手机系统参数显示的内存大小：

/**
 * RAM内存大小, 返回1GB/2GB/3GB/4GB/8G/16G
 * @return
 */
public static String getTotalRam(){
    String path = "/proc/meminfo";
    String ramMemorySize = null;
    int totalRam = 0 ;
    try{
        FileReader fileReader = new FileReader(path);
        BufferedReader br = new BufferedReader(fileReader, 4096);
        ramMemorySize = br.readLine().split("\\s+")[1];
        br.close();
    }catch (Exception e){
        e.printStackTrace();
    }
    if(ramMemorySize != null){
        totalRam = (int)Math.ceil((Float.valueOf(Float.parseFloat(ramMemorySize) / (1024 * 1024)).doubleValue()));
    }

    return totalRam + "GB";
}

/**
 * ROM内存大小，返回 64G/128G/256G/512G
 * @return
 */
private static String getTotalRom() {
    File dataDir = Environment.getDataDirectory();
    StatFs stat = new StatFs(dataDir.getPath());
    long blockSize = stat.getBlockSizeLong();
    long totalBlocks = stat.getBlockCountLong();
    long size = totalBlocks * blockSize;
    long GB = 1024 * 1024 * 1024;
    final long[] deviceRomMemoryMap = {2*GB, 4*GB, 8*GB, 16*GB, 32*GB, 64*GB, 128*GB, 256*GB, 512*GB, 1024*GB, 2048*GB};
    String[] displayRomSize = {"2GB","4GB","8GB","16GB","32GB","64GB","128GB","256GB","512GB","1024GB","2048GB"};
    int i;
    for(i = 0 ; i < deviceRomMemoryMap.length; i++) {
        if(size <= deviceRomMemoryMap[i]) {
            break;
        }
        if(i == deviceRomMemoryMap.length) {
            i--;
        }
    }
    return displayRomSize[i];
}

2.获取当前可用运行内存，总运行内存：

/**
 *   * 获取android总运行内存大小
 *   * @param context
 *   *
 */
public static long getTotalMemory(Context context) {
    String str1 = "/proc/meminfo";// 系统内存信息文件
    String str2;
    String[] arrayOfString;
    long initial_memory = 0;
    try {
        FileReader localFileReader = new FileReader(str1);
        BufferedReader localBufferedReader = new BufferedReader(localFileReader, 8192);
        str2 = localBufferedReader.readLine();// 读取meminfo第一行，系统总内存大小
        arrayOfString = str2.split("\\s+");
        for (String num : arrayOfString) {
            Log.i(str2, num + "\t");
        }
        // 获得系统总内存，单位是KB
        int i = Integer.valueOf(arrayOfString[1]).intValue();
        //int值乘以1024转换为long类型
        initial_memory = new Long((long) i * 1024);
        localBufferedReader.close();
    } catch (IOException e) {
    }
    long memory = initial_memory / 1024 / 1024;//获取MB
    return memory;
}

   /**
     *   * 获取android当前可用运行内存大小
     *   * @param context
     *   *
     */
    public static String getAvailMemory(Context context) {
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
        am.getMemoryInfo(mi);
// mi.availMem; 当前系统的可用内存
        return Formatter.formatFileSize(context, mi.availMem);// 将获取的内存大小规格化
    }
    
    /**
     *   * 获取android总运行内存大小
     *   * @param context
     *   *
     */
    public static String getTotalMemoryString(Context context) {
        String str1 = "/proc/meminfo";// 系统内存信息文件
        String str2;
        String[] arrayOfString;
        long initial_memory = 0;
        try {
            FileReader localFileReader = new FileReader(str1);
            BufferedReader localBufferedReader = new BufferedReader(localFileReader, 8192);
            str2 = localBufferedReader.readLine();// 读取meminfo第一行，系统总内存大小
            arrayOfString = str2.split("\\s+");
            for (String num : arrayOfString) {
                Log.i(str2, num + "\t");
            }
            // 获得系统总内存，单位是KB
            int i = Integer.valueOf(arrayOfString[1]).intValue();
            //int值乘以1024转换为long类型
            initial_memory = new Long((long)i*1024);
            localBufferedReader.close();
        } catch (IOException e) {
        }
        return Formatter.formatFileSize(context, initial_memory);// Byte转换为KB或者MB，内存大小规格化
    }

/**
 * 方法名：getMemoryInfo()
 * 功    能：获取手机总存储,可用存储
 * 参    数：无
 * 返回值：long
 */
public static long getMemoryInfo() {
    //获取到手机数据文件
    File path = Environment.getDataDirectory();
    //获取一个磁盘的状态对象
    StatFs stat = new StatFs(path.getPath());
    //获得一个扇区的大小
    long blockSizes = stat.getBlockSize();
    //获取扇区总数
    long totalBlocks = stat.getBlockCount();
    //获得可用扇区数量
    long availableBlocks = stat.getAvailableBlocks();
    //获得总存储空间,MB
    long memory = blockSizes * totalBlocks / 1024 / 1024;
    //获得总存储空间
    //String totalMemory = Formatter.formatFileSize(this, blockSizes * totalBlocks);
    //获得可用存储空间
    //String availableMemory = Formatter.formatFileSize(this, availableBlocks * blockSizes);
    return memory;
}

//获取小米手机的机型：

/**
 * 如果小米手机获取Build.MODEL的结果是M2004J19C这样的格式
 * 那么使用反射获取小米手机型号 例如：Redmi note 9
 *
 * @return
 */
public static String getXiaoMiModel() {
    String deviceName = "";
    try {
        @SuppressLint("PrivateApi") Class c = Class.forName("android.os.SystemProperties");
        @SuppressLint("PrivateApi") Method m = c.getDeclaredMethod("get", String.class);
        m.setAccessible(true);
        deviceName = (String) m.invoke(null, "ro.product.vendor.marketname");
        if (TextUtils.isEmpty(deviceName)) {
            deviceName = (String) m.invoke(null, "ro.product.marketname");
        }
        Log.d("WorkPhoneCheck", "deviceName: " + deviceName);
    } catch (Throwable e) {
        e.printStackTrace();
    }
    return TextUtils.isEmpty(deviceName) ? Build.MODEL : deviceName;
}

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