Follow-up steps to password protect Android app launch
Following this StackOverflow question , what is the best way to show the password screen?
My first attempt was to start SubActivity using LockActivity:
// MainActivity.java
public void onResume() {
super.onResume();
ApplicationState state = ((ApplicationState) getApplication());
if ((new Date().getTime() - state.mLastPause) > 5000) {
// Prompt for password if more than 5 seconds since last pause
Intent intent = new Intent(this, LockActivity.class);
startActivityForResult(intent, UNLOCKED);
}
}
However, this causes the MainActivity to pause again after unlocking if the LockActivity is displayed for more than 5 seconds.
So, I have some things:
- Use
Fragments
to display the main screen or lock screen inside MainActivity. - Show
Dialog
as lock screen (not recommended). - Using multiple branches
if ... else
to check if the password has been set and the MainActivity has been suspended for longer than five seconds.
To give you an example, I would like to achieve the same behavior as in the Dropbox app (using the "Password Lock" option).
What is the correct way to handle this?
PS I'm not sure if I should post this as a question to the original question, digging up an old thread. I felt that posting a new question was a cleaner solution.
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Since I was asking a different question, I could tell you how I solved it. I use a dialog box to ask for a password (which I know you don't like, but might help someone else) and make sure the only way to decline it is to enter the correct password.
MyApplication app = ((MyApplication)getApplication());
if (new Date().getTime() - app.mLastPause > 5000) {
// If more than 5 seconds since last pause, check if password is set and prompt if necessary
SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);
String password = pref.getString("password", "");
if (password.length() > 0) {
// Prompt for password
MyPasswordDialog dlg = new MyPasswordDialog(this, password);
dlg.setOwnerActivity(this);
dlg.show();
}
}
And in the OnCreate()
MyPasswordDialog method I make sure it is not overridden
protected void onCreate(Bundle savedInstanceState) {
this.setCancelable(false);
// ...and some other initializations
}
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