我有一个Android应用程序，其中显示一个图标，上面写着“设备应使用PIN或图案进行保护”。
然后，用户转到“设置”并为其设备启用PIN或模式，然后返回到应用程序。
仍然显示图标。如何监听此事件并禁用图标？
该图标仅在应用终止并重新启动后消失。
最佳答案
我认为没有任何此类事件的事件侦听器。
您可以做的是，每次应用程序onResume().时都可以进行检查
通过以下代码的一点操作。
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;
}
}