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after returning back from my second Activity to first Activity on clicking button the whole data is gone

I have two activties:
activity_main,
activity_display
in the main_activity user enters his/her name and presses the toggle button to display.
that takes the user to display_activity page where the result is displayed.
if the user finds that he/she has entered the wrong info they can go back and edit.
here is where the problem starts
after pressing the toggle button - display
it goes to display_activity and displays but when I press "back" button I'm restarting the whole (first) main_activity again... no values are present...
even the toggle button that needs to be set to "reset" is again showing "display".
should i use something else instead of
startActivity(intend1);
i want to resume the (first) activity main not restart everything

Seems like your first activity uses results from second activity. you can use startActivityForResult. Here is a very good answer refer to it.
How to manage startActivityForResult on Android

How to close the app when back pressed from main menu

I build an app. There are so many activities. When clicked on the back button of the phone it supposed to exit from the app when in the `MainActivity` but when clicked on back button it switches between the activities visited recently. I added Intents to switch to the activity I need to switch for every activity except `MainActivity`. Now they are working perfectly but I need my app to exit when clicked on the back button of the phone when in the `MainActivity` and also one thing, I have an **Splash Activity** in my app. I made some apps earlier also and there were one `WebView` app and there are only one Activity. In that app also there were a **Splash Activity** and when clicked on the back button it goes to the splash activity and not exiting the app. Also I need to exit the app when clicked on the button.
Please help me!
God Bless!

This can be achieved using finishAffinity()

Android - Black Screen after clicking BACK in an Activity with an AltertDialog after Search Activity

I have an Activity which displays an alert dialog priot to the content.
Also a search activity is called before this activity.
Now when i press back on this activity i am lead to a black screen (which i assume is eighter because of the dialog [unlikely] or from the search activity). Only when i press BACK twice i get to the activity i was before.
How can i get rid of this?
Thank you.

This phenomenon was caused by the search activity. to avoid this i simply added android:noHistory="true" for the Search Activity in the Manifest.

Navigate to previous Activity

I have two screens, in second screen i have one back button that shows the first screen(using intent). if i click that back button from second screen i navigated to first screen no probs in that.. now i want to navigate back to second screen automatically without clicking any button. Please help me how can i do this. Thanks for ur valuable time .

I would give a try to a ViewFlipper activity, with two screens. This, of course, if you can encapsulate your actions into one activity (which i'm sure is manageable with AsyncTasks / Threads, Services and Handlers).
This way you can use gestures, (soft/hard)buttons, dropdowns, -whatever-, to navigate between your screens.

You can automatically go back to a previous activity on the Activity stack by calling the finish() method.
If you want to do this without any user interaction, use a Handler that automatically calls finish() on your activity after a predefined timeout (see this article for more information on Handlers).

try with Thread.sleep([ms]) and then call finish or call intent to the first

The one solution is, when you press BACK button from second screen instead of call finish(); you should start first activity again, so the activity stack will be
FIRST
SECOND
FIRST
so after the delay of two second your activity will finish and eventually will come back to second screen, and state will be maintained also.

Android change in view - Button state gets reset

I have a button which is basically used for start/stop. So initially the text of the button is set to start. I attached a OnClickListener to it. So whenever it gets clicked i change its text. So if it was start it become stop and vice-versa.
The problem comes when i change my phone view from portrait to landscape or vice-versa the button text gets reset.
So for example I clicked the start button---it changed to stop. Now if I tilt my phone to change the view the button text gets set to start again.
Am I using the button in a wrong way?

You should save your button state. When screen orientation changes, onCreate is called and all your app variables are re-intitialized. Read more here http://developer.android.com/reference/android/app/Activity.html

No, you are using the button in the right way.
The thing what you are seeing is "configuration change". When you are tilting your device, Android recreating your activity and recreating all it's views (so, they getting default captions as them described in XML).
You need to do the
disable configuration changes for your Activity. To do so, add the following to your manifest's activity tag: android:configChanges="orientation|keyboardHidden". It is not suitable, if you have different layouts for landscape and portraint orientations, when you need to...
handle the configuration changes by overriding onSaveInsatnceState method of your Activity, save a state there and then use it in onCreate method.
See this article for further explanation