Topwo博客-Android获取CPU，内存，磁盘使用率

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Android获取CPU，内存，磁盘使用率

发布时间：2021-12-07作者：Topwo来源：原创点击：386

```java
/**
 * Byte转换为KB或者MB，将获取的内存大小规格化
 * @return
 */
public static String formatFileSize(long sizeBytes) {
    return Formatter.formatFileSize(SmartDoorApplication.getApplication(), sizeBytes);
}

/**
 * 获取cpu使用率
 * @return
 */
public static float getCpuUsed() {
    try {
        RandomAccessFile reader = new RandomAccessFile("/proc/stat", "r");
        String load = reader.readLine();
        String[] toks = load.split(" ");
        long idle1 = Long.parseLong(toks[5]);
        long cpu1 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4])
                + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]);
        try {
            Thread.sleep(360);
        } catch (Exception e) {
            e.printStackTrace();
        }
        reader.seek(0);
        load = reader.readLine();
        reader.close();
        toks = load.split(" ");
        long idle2 = Long.parseLong(toks[5]);
        long cpu2 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4])
                + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]);
        return (float) (cpu2 - cpu1) / ((cpu2 + idle2) - (cpu1 + idle1));
    } catch (IOException ex) {
        ex.printStackTrace();
    }
    return 0;
}

/**
 * 获取内存可用空间
 * @return
 */
public static long getAvailMemory() {// 获取android当前可用内存大小
    ActivityManager am = (ActivityManager) SmartDoorApplication.getApplication().getSystemService(Context.ACTIVITY_SERVICE);
    ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
    am.getMemoryInfo(mi);
    return mi.availMem; // 当前系统的可用内存
}

/**
 * 获取内存总共空间
 * @return
 */
public static long getTotalMemory() {
    String dir = "/proc/meminfo";// 系统内存信息文件
    long totalMemorySize = 0;
    try {
        FileReader fr = new FileReader(dir);
        BufferedReader br = new BufferedReader(fr, 2048);
        String memoryLine = br.readLine();// 读取meminfo第一行，系统总内存大小
        String subMemoryLine = memoryLine.substring(memoryLine.indexOf("MemTotal:"));
        br.close();
        totalMemorySize = Integer.parseInt(subMemoryLine.replaceAll("\\D+", ""));
        totalMemorySize *= 1024;// 获得系统总内存，单位是KB，乘以1024转换为Byte
    } catch (IOException e) {
        e.printStackTrace();
    }
    return totalMemorySize;
}

/**
 * 获取手机内部可用空间大小
 * @return
 */
static public long getAvailableInternalMemorySize() {
    File path = Environment.getDataDirectory();
    StatFs stat = new StatFs(path.getPath());
    long blockSize = stat.getBlockSizeLong();
    long availableBlocks = stat.getAvailableBlocksLong();
    return availableBlocks * blockSize;
}

/**
 * 获取手机内部空间大小
 * @return
 */
public static long getTotalInternalMemorySize() {
    File path = Environment.getDataDirectory(); //Gets the Android data directory
    StatFs stat = new StatFs(path.getPath());
    long blockSize = stat.getBlockSizeLong(); //每个block 占字节数
    long totalBlocks = stat.getBlockCountLong(); //block总数
    return totalBlocks * blockSize;
}

/**
 * 外部存储是否可用 (存在且具有读写权限)
 */
public static boolean isExternalStorageAvailable() {
    return Environment.getExternalStorageState().equals(
            Environment.MEDIA_MOUNTED);
}

/**
 * 获取手机外部可用空间大小
 * @return
 */
public static long getAvailableExternalMemorySize() {
    if (isExternalStorageAvailable()) {
        StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getAbsolutePath());
        long blockSize = stat.getBlockSizeLong();
        long availableBlocks = stat.getAvailableBlocksLong();
        return availableBlocks * blockSize;
    } else {
        return 0;
    }
}

/**
 * 获取手机外部总空间大小
 * @return
 */
public static long getTotalExternalMemorySize() {
    if (isExternalStorageAvailable()) {
        StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getAbsolutePath());
        long blockSize = stat.getBlockSizeLong();
        long totalBlocks = stat.getBlockCountLong();
        return totalBlocks * blockSize;
    } else {
        return 0;
    }
}
```

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