Re: [android-developers] Re: When the new activity starts, the data of previous activity is gone.

Hi Pranav,

The way in the previous mail has an issue: if user inputs sth. in Current activiy named Activity2, then Presses "Prev", the previous Acitivy named Activity1 does keep the inputed contents in UI, however when user presses "Next" here to go to Activity2, Activity2 will not keep the data inputed by user.

 

Another solution: Construct a Class for your registration info i.e. Person which implements Serializable interface.

 

1. For each activiy,  implements the 2 buttons' logic like this:

next.setOnClickListener(new OnClickListener(){

   public void onClick(View v) {

        update person according to the cotents inputed by user

        Intent i = new Intent();

        i.setClassName(the name of the next activity.....);

        i.putExtra("Person", person);....... //to pass this activity's data to next

        startActivity(i);

        finish();

 }});

 

previous.setOnClickListener(new OnClickListener(){

   public void onClick(View v) {

       update person according to the contents inputed by user 

       Intent i = new Intent();

        i.setClassName(the name of the previous activity.....);

        i.putExtra("Person", person);....... //to pass this activity's data to next

        startActivity(i);

        finsh();

 }});

 Of course, special logic is needed for the first activity's Back button & the last activity's Next button;

 

2. Add below code in OnCreate() :

Intent i = getIntent();

person = (Person)i.getSerializableExtra("Person");

if(person != null) {

    update the editable ui controls according to the value of person's member variables

}  else {
    person = new Person();   // this will only happen in the first activiy

}

3.  For the back key handle, use the same logic as Prev button to set onKeyListener for the activiy.   

 

BRs,

Rui

 

2010/1/1 Rui Wu <netiger198610@gmail.com>

 

Hi Pranav,

I guess you implemented your logic like this:

 

Button previous = (Button) findViewById(.....);

previous.setOnClickListener(new OnClickListener(){

   public void onClick(View v) {

        Intent i = new Intent();

        i.setClassName(the name of the previous activiy.....);

        startActivity(i);

 }});

 

 

Try the below way:

Button next = (Button) findViewByid(.....);

next.setOnClickListener(new OnClickListener(){

   public void onClick(View v) {

        Intent i = new Intent();

        i.setClassName(the name of the next activity.....);

        i.putExtra();....... //to pass this activity's data to next

        startActivity(i);

 }});

 

Button previous = (Button) findViewById(.....);

previous.setOnClickListener(new OnClickListener(){

   public void onClick(View v) {

        finish();

 }});

 

What you need to do is passing the current activity's data to next Activity;  When you press the Prev button, you will find Android keeps the inputed strings  in the EditText and other editable views automatically.......

 

Hope this can help you.

  

2009/12/31 android09 <pranav.jajal09@gmail.com>

 

Hi Neilz,

 

Thank you for reply me with the proper and useful idea. I tried to

hold the first activity data but it gives error while loading the

data. It is not allows me to get data back.

 

Can you understand me by the code? How can i hold the first activity's

data when i start another activity and get back to previous. I also

tried with the onPause() and onResume() methods. How can i do that

with the code? Please help me.

 

Thank you.

Regards,

---------------

Pranav

 

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