错误FLAG_ACTIVITY_NEW_TASK标志

Question

Hi I try to build an app, but I have the next error when I logout app, my app use login users, but when press logout show me this:

error

android.util.AndroidRuntimeException: Calling startActivity() from 
outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK
flag. Is this really what you want?

logout code

public void logout() {
   SharedPreferences sharedPreferences = mCtx.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
   SharedPreferences.Editor editor = sharedPreferences.edit();
   editor.clear();
   editor.apply();
   mCtx.startActivity(new Intent(mCtx, LoginActivity.class));
}

Answer 1

This is because you're trying to start the activity using mCtx which is a non-activity context. You need to use the Activity where logout method reside, something like this:

public void logout() {
  ...
  startActivity(new Intent(this, LoginActivity.class));
  // or use YourActivity.this instead of this
}