What is the purpose of using moveTaskToBack() method in android?

Question

I am using moveTaskToBack() method in my activity.

When I am pressing back button the activity still is visible. The back key does not work. What did I do wrong here

Answer 1

Before i update the code, when i want to close my app in these situations, something unexpected happen to me.

Launch -> isSignIn(yes) -> MainActivity -> Press Back -> Close.

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Launch -> isSignIn(no) -> SignInActivity -> Press Back -> Close.

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Launch -> isSignIn(yes) -> MainActivity -> Press Sign Out -> SignInActivity -> Press Back -> SignInActivity -> Press Back -> SignInActivity (and so on loop and stuck on SignInActivity until i press history/recent app/home button).

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Launch -> isSignIn(no) -> SignInActivity -> Press Sign In -> MainActivity -> Press Sign Out -> SignInActivity -> Press Sign In -> MainActivity -> Press Back -> MainActivity -> Press Back -> MainActivity (and so on loop and stuck on MainActivity until i press history/recent app/home button).

Now i provide this code both on SignInActivity that has Sign In button and MainActivity that has Sign Out button.

@Override
    public void onBackPressed() {
        super.onBackPressed();
        moveTaskToBack(true);
        finish();
    }

It's now working fine on every situations. When i press Back, the application close.