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Save typed us state

I guess welcome to the lower studios let's get to discuss saving our restoring activity states in Android the I few scenarios in which your activity is destroyed due to normal odd behavior such as when the user presses the back button or your activity signals the finish method in the case of a screen rotation from portrait to landscape and vice versa the activity gets destroyed i recreated again thereby some loss of data might be observed with a change in ListView opposition as well in this tutorial i'll be walking you through on how to save your activity states in order to undo the resumed state of the Android application and restore the data on for rotation as your activity begins to stop the system calls the unsafe instance state method so your activity can save the state information with the key value PS let's get started right in under studio I have a demo application basically this application is structured on a form that takes in our 300 fields the employee name first name last name and title and as a Save button to save to you so this is actually going to get our by impute from their D text and save it to a string below so this is just a layout structure of this particular demo application baba uses for view the layout view to depict each layout of the form as a force demon last name for the employee title and the other safe button which triggers the on click Save view method where obvious are associated that in the class and as that three textviews below the budget which actually gonna display the appropriate name titoo and so on so we have for the first name the last name and the title as i straight to the main activity I have some code commented out our actually around this code just as it is so we'll be able to look at that rather in the emulator and I'm actually going to our rotates the screen so we get to see if there's our APIs is sensed save of data or not basically this application as you seen actually gets our energy checks the first name last name tights you on Department and uh it initializes their buh-bye it gets the appropriate ID and at the same time we have a string variable which we are jolly at from the text view there are the text view right there the first last and they tied to which we initialized as well and called its appropriate ID and if we should look at the save view method this actually sets the text are to the value of the ID checks get the text from bar to string and you trim up and set that to the appropriate text view so which you actually display the view so let's get to look at the application right in the emulator average run in the emulator I'll fill out to the fields and get to safety view and rotate the screen and see what happens pelipper the queries or the safety of you have the name spit it out Varma Delhi Ikaruga software developer now let me rotate the screen can see that the view disappeared we couldn't save the state of the data assistant Lee on screen rotation this is not a good user experience back to the portrait view of the application so for us to actually have a civil state of the applicant of the data we need to override a method which is called on save instance States so I Waukesha now to actually achieve this firstly I'll commit some a spell now now this are the three constants of keys that will be needed based on the first name last name and title we'll give it a public static final string and are their corresponding values so these are keys will be actually calling right there in the course of the discussed it now right there in the oncreate method we get to check if the safe instance state is not equal to norm but before I go to the if and else statements I would like to check out the safe instance States method for you to save estates of a persistent data you need to a variety of savings tested which take a parameter which is the safe instance stage that's the bundle and in this particular bond do that's when you get to put in the key value PS you're trying to save persistently for this our demo we need to save the name the first name the last name and the title that's where you call the savings estate object of the bundle you put a string if it's an integer it is a double based on the data type here choking out record the key which we declared earlier which is the key frost name which depicts the first name and now we need to pass in a value what about we need to gets the text which is from where the attic text and convert that to string or you get that from the text view you can get from that it takes like a phone text best way to approach this so allocated from it view already which is for detective and we have it ready from the Faust's which is the infest our name we get the same thing from the last foot for the title because we've actually set that right there when you click on the save view method once you click on the Save button you have that are set so that's where we could be able to get this value this value should have been known and I will gather last name and also we got the tight based on the value set when you click the save view method afterwards right there in the oncreate method you need to check if the same instance state is not equal to null because it is if it is it was to no damage there's a new entry there trying to get back while if it's not it was to know definitely is good to pick from this instance states that he said because who owns a up all the activity is closing up or finishing is actually saves on data gradually save instance state method and was is we're launching or resuming again it's actually first of all check if there's a seven strand state rather than the bundle and if not it's actually create a new one but if the a is so I began to call those data frosty before it's a creates any other layer so that's why we need to check that it is null or not it is not requested more definitely there are some data where there in the bond do you call the save instance needs to gather string which is the key for the first name you pass that to a variable called safest name and now you need to set that right there to the view to be to the textview i set the text save it back senticles for the last name we got a key and I extract value from the key received at write a to the last name the same T applicable today lee tae to so from there to be able to have a persist ensive of data on screen rotation so from here I would like to launch this application again unless see if you can if this we actually save the data resistant Lee evil when we need rotate our the screen so let's look back to the emulator get see that our spirit out cool we have that right there so let me walk in the data saved view cool we have it now let me rotate the screen can you see that we have a resistance saver of data using the on safe instance states passing the key and also the values and extracting that particular value and our custom lead down to the view right and it's method you can't use on restore state the instance stage instead of our rights I embed in it's inside the oncreate method all are the same because in na are we launched or in any resume of an activity that was going to be a call to the oncreate method or to the all stop save instance state so this is a very good user experience if you're actually a handling forms or if you are doing a any application whatsoever that you need to keep the data base essentially even when you're using it a list is curved you you need to keep the position or rotation let's our the scroll list still maintain the position the user screwed it to so it shouldn't start from the beginning that's a good user experience so our employee to our integrate seven translate in any parts you feel you need to use it and this is just the first level saving up data we are shared preferences we have the database the SQLite database and we are clouds these are all out of the box from Android to app build a pair up the saved data bases that thank you guys for agonal with me throughout the session and please don't forget subscribe to my channel let me rotate back to see of the state of the data and see that skip this terrorist it Desa states thank you guys one more time and a half pleasure time