android - 检查是否启用了锁定

Question

我必须检查设置中是否启用了系统锁定。

我使用了下面的代码

boolean b = android.provider.Settings.System.getInt(
                        getContentResolver(),Settings.System.LOCK_PATTERN_ENABLED, 0)==1;

如果我设置 pattern 锁定返回 true，如果我设置 pin/password 密码返回 false。

我需要检查是否启用了锁定，或者它是 pattern/pin/password 设置中的锁定。

我的代码只适用于 pattern 锁定而不是 pin/password 锁定。

所以请告诉我如何检查所有类型的锁。

Answer 1

所以这个问题已经很老了，但似乎还没有什么好的答案。经过一些源代码(来自 Ramakrishna's link)研究和 self 实验后，我编写了简单的类来完成这项工作。

public class LockType
{
    private final static String PASSWORD_TYPE_KEY = "lockscreen.password_type";

    /**
     * This constant means that android using some unlock method not described here.
     * Possible new methods would be added in the future releases.
     */
    public final static int SOMETHING_ELSE = 0;

    /**
     * Android using "None" or "Slide" unlock method. It seems there is no way to determine which method exactly used.
     * In both cases you'll get "PASSWORD_QUALITY_SOMETHING" and "LOCK_PATTERN_ENABLED" == 0.
     */
    public final static int NONE_OR_SLIDER = 1;

    /**
     * Android using "Face Unlock" with "Pattern" as additional unlock method. Android don't allow you to select
     * "Face Unlock" without additional unlock method.
     */
    public final static int FACE_WITH_PATTERN = 3;

    /**
     * Android using "Face Unlock" with "PIN" as additional unlock method. Android don't allow you to select
     * "Face Unlock" without additional unlock method.
     */
    public final static int FACE_WITH_PIN = 4;

    /**
     * Android using "Face Unlock" with some additional unlock method not described here.
     * Possible new methods would be added in the future releases. Values from 5 to 8 reserved for this situation.
     */
    public final static int FACE_WITH_SOMETHING_ELSE = 9;

    /**
     * Android using "Pattern" unlock method.
     */
    public final static int PATTERN = 10;

    /**
     * Android using "PIN" unlock method.
     */
    public final static int PIN = 11;

    /**
     * Android using "Password" unlock method with password containing only letters.
     */
    public final static int PASSWORD_ALPHABETIC = 12;

    /**
     * Android using "Password" unlock method with password containing both letters and numbers.
     */
    public final static int PASSWORD_ALPHANUMERIC = 13;

    /**
     * Returns current unlock method as integer value. You can see all possible values above
     * @param contentResolver we need to pass ContentResolver to Settings.Secure.getLong(...) and
     *                        Settings.Secure.getInt(...)
     * @return current unlock method as integer value
     */
    public static int getCurrent(ContentResolver contentResolver)
    {
        long mode = android.provider.Settings.Secure.getLong(contentResolver, PASSWORD_TYPE_KEY,
                DevicePolicyManager.PASSWORD_QUALITY_SOMETHING);
        if (mode == DevicePolicyManager.PASSWORD_QUALITY_SOMETHING)
        {
            if (android.provider.Settings.Secure.getInt(contentResolver, Settings.Secure.LOCK_PATTERN_ENABLED, 0) == 1)
            {
                return LockType.PATTERN;
            }
            else return LockType.NONE_OR_SLIDER;
        }
        else if (mode == DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK)
        {
            String dataDirPath = Environment.getDataDirectory().getAbsolutePath();
            if (nonEmptyFileExists(dataDirPath + "/system/gesture.key"))
            {
                return LockType.FACE_WITH_PATTERN;
            }
            else if (nonEmptyFileExists(dataDirPath + "/system/password.key"))
            {
                return LockType.FACE_WITH_PIN;
            }
            else return FACE_WITH_SOMETHING_ELSE;
        }
        else if (mode == DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC)
        {
            return LockType.PASSWORD_ALPHANUMERIC;
        }
        else if (mode == DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC)
        {
            return LockType.PASSWORD_ALPHABETIC;
        }
        else if (mode == DevicePolicyManager.PASSWORD_QUALITY_NUMERIC)
        {
            return LockType.PIN;
        }
        else return LockType.SOMETHING_ELSE;
    }

    private static boolean nonEmptyFileExists(String filename)
    {
        File file = new File(filename);
        return file.exists() && file.length() > 0;
    }
}

现在你只需要做

int lockType = LockType.getCurrent(getContentResolver());

来自您的Activity类(class)。如果你想检查一些锁类型然后使用 switch statement

switch (lockType) 
{
    case LockType.FACE_WITH_PATTERN:
    case LockType.FACE_WITH_PIN:
    case LockType.PATTERN:
        /* do something */
        break;
}

或者如果您只想要“面部解锁”，无论使用哪种附加方法

if (lockType >= LockType.FACE_WITH_PATTERN && lockType <= LockType.FACE_WITH_SOMETHING_ELSE)
{
    /* do something */
}

编辑:所以，我在 3 部手机上测试这个类(class)，似乎并非所有手机都能正确检测到面部解锁方法。在某些手机上 PASSWORD_QUALITY_BIOMETRIC_WEAK返回和 PASSWORD_QUALITY_SOMETHING在别人身上。我想我们可以检查一些包含面部解锁信息的文件是否存在且不为空，类似于密码/pin 和模式方法。但是现在我不知道这个文件到底在哪里。

EDIT2:看起来我在 android 4.3 源代码研究后发现了这个问题。那是因为锁定设置已移动到新位置(/data/system/locksettings.db)，并且似乎无法从该数据库中获取这些设置(rw-rw----权限和“系统”所有者和组所以只有root才能完成这项工作)。