使用标志Intent.FLAG_ACTIVITY_NEW_TASK从onPostExecute（）方法启动意图不起作用

Question

I am using the default LoginActivity , when you go to New... > Android Activity inside Eclipse with ADT Tools on Android 4.2 SDK.

It contains an email field, password field and a button that says "Sign in or Register". When you click on that button, it performs a fake async network request, calls a few methods to show progress bar, verify user login with dummy data, and the last thing that gets called if everything is successful:

        @Override
        protected void onPostExecute(final Boolean success) {
            mAuthTask = null;
            showProgress(false);

            if (success) {
                //finish();
                Intent intent = new Intent(LoginActivity.this, MainActivity.class)
                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_TASK_ON_HOME);
                startActivity(intent);
            } else {
                mPasswordView
                        .setError(getString(R.string.error_incorrect_password));
                mPasswordView.requestFocus();
            }


}

I commented out finish(), and instead would like to open a new activity window that would be my main app window (Logged in state). I just started with Android yesterday, and I've seen a lot of examples use fragments for this sort of thing instead of activities. Does it matter? Anyway, it works fine, it opens a new activity but I can still press "Back button" and it will take me the login screen . I am pretty sure those flags I set below on the activity is what's required to clear the history stack, but it doesn't work.

How can I fix above code to clear the history stack? In other words after I log in, it should take me to the new activity, and if I press Back , it should take me to the Home screen .

Update

I have attached code for LoginActivity, MainActivity, AndroidManifest.

Link : https://gist.github.com/sahat/5445657

Answer 1

Use Intent.FLAG_ACTIVITY_CLEAR_TOP instead. The flags you are using create a new task but don't do anything to the rest of the stack. This flag will clear all other Activities . If the Activity exists, it will just clear out the rest of the Activities so the MainActivity will be on top

FLAG_ACTIVITY_CLEAR_TOP

Edit

If you want to go to the Home screen after pressing back from the next Activity then just call finish() on the login Activity when you log in. This will remove the login page from your stack. You can also specify

android:noHistory="true"

in the Activity tag for login screen in manifest

Answer 2

Try this

@Override
    protected void onPostExecute(final Boolean success) {
        mAuthTask = null;
        showProgress(false);

        if (success) {
            Intent intent = new Intent(LoginActivity.this, MainActivity.class)
            startActivity(intent);
            finish();
        } else {
            mPasswordView
                    .setError(getString(R.string.error_incorrect_password));
            mPasswordView.requestFocus();
        }

}