Android读取RAM,ROM,SD卡容量

Android读取RAM容量

在Android系统中,可以通过StatFs类来获取设备的RAM容量,以下是一个简单的示例:

import android.os.Environment;
import android.os.StatFs;
public long getAvailableRam(Context context) {
    // 获取系统缓存目录
    File cacheDir = context.getCacheDir();
    if (cacheDir == null) {
        return 0;
    }
    // 创建StatFs对象
    StatFs statFs = new StatFs(cacheDir.getPath());
    // 获取BlockSize和BlockCount
    long blockSize = statFs.getBlockSizeLong();
    long blockCount = statFs.getBlockCountLong();
    // 计算可用内存大小
    long availableBlocks = blockCount * blockSize;
    long availableRam = availableBlocks * Environment.getStorageCapacityFraction();
    return availableRam;
}

Android读取ROM容量

要获取设备的ROM容量,可以使用以下方法:

Android读取RAM,ROM,SD卡容量

1、需要在AndroidManifest.xml文件中添加读写外部存储的权限:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2、在代码中使用Environment类的getExternalStorageDirectory()方法获取外部存储的根目录:

File externalStorageDirectory = Environment.getExternalStorageDirectory();

3、使用StatFs类来获取ROM容量:

Android读取RAM,ROM,SD卡容量

public long getTotalRom(Context context) {
    // 获取外部存储目录
    File externalStorageDirectory = Environment.getExternalStorageDirectory();
    if (externalStorageDirectory == null) {
        return 0;
    }
    // 创建StatFs对象
    StatFs statFs = new StatFs(externalStorageDirectory.getPath());
    // 获取BlockSize和BlockCount
    long blockSize = statFs.getBlockSizeLong();
    long blockCount = statFs.getBlockCountLong();
    // 计算总ROM容量(字节)
    long totalRom = blockSize * blockCount;
    return totalRom;
}

Android读取SD卡容量

要获取设备的SD卡容量,可以使用以下方法:

1、需要在AndroidManifest.xml文件中添加读写外部存储的权限:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2、在代码中使用Environment类的getExternalStorageState()方法判断设备是否支持外部存储,并使用Environment类的getExternalStorageDirectory()方法获取外部存储的根目录:

Android读取RAM,ROM,SD卡容量

if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
    File externalStorageDirectory = Environment.getExternalStorageDirectory();
} else if (Environment.getExternalStorageState().equals(Environment.MEDIA_SHARED)) {
    Uri sharedStorageUri = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
} else if (Environment.getExternalStorageState().equals(Environment.MEDIA_UNMOUNTED)){
    Uri defaultStorageUri = Environment.getDataDirectory();//default storage is usually in the application's files directory which is a private directory for the application and not accessible by other applications on the device unless you have granted your app permission to access that directory directly through the Storage Access Framework or similar system APIs. In this case, we can just use the internal storage as a fallback when external storage is not available or mounted properly on the device. This might happen on some devices where the user has disabled the external storage or has an SD card with no card slot or an invalid file system format that cannot be read by the device's file system driver. In such cases, the internal storage is used as a backup solution until the user reformats or replaces the SD card with a valid one that can be accessed by the device's file system driver. The path of the default storage directory will vary depending on the device manufacturer and Android version, but it is usually located at "/data/data/[your package name]/files" on most devices running Android Lollipop (API level 21) and higher and "/data/user/0/files" on older devices running Android KitKat (API level 4) and lower. However, since these paths are private to your app and not accessible by other apps on the device, you should only use them as a last resort when all other options have failed and you need to store data in a location that can be accessed by both your app and other apps on the device without any additional permissions or configuration changes to the device's file system driver or other system components that may affect its operation or security. For more information about how to access the default storage directory programmatically on Android, please refer to the official Android documentation at https://developer.android.com/training/data-storage/shared-filesfiles

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