Question

I have total 3 activites. I pass the data from the first activity like this:

 Intent i = new Intent(getApplicationContext(), History.class);
        i.putExtra("day", mDay);
        i.putExtra("month", mMonth+1);
        i.putExtra("year", mYear);
        startActivity(i);

get the data:

Bundle extras = getIntent().getExtras(); 
    if(extras !=null) { .......

now I pass the data from the second activity:

Intent i = new Intent(getApplicationContext(), History.class);
                i.putExtra("Hday", mDay);
                i.putExtra("Hmonth", mMonth);
                i.putExtra("Hyear", mYear);
                startActivity(i);

and get the data from the second activity:

Bundle extras2 = getIntent().getExtras(); 
    if(extras2 !=null) {

So, I have extras to get the data from the first activity, and extras2 to get the data from the second activity. But when I pass the data from any activity both extras are not null!
What have I done wrong?

Answer 1

The problem is that your third activity has no way of knowing which activity sent the bundle. You need to add a field that identifies what type of bundle this is so you can process accordingly. For instance, in activity 1:

Intent i = new Intent(getApplicationContext(), History.class);
        i.putExtra("activity", (int)1);
        i.putExtra("day", mDay);
        i.putExtra("month", mMonth+1);
        i.putExtra("year", mYear);
        startActivity(i);

Then in 3rd activity:

Bundle extras = getIntent().getExtras(); 
    if(extras !=null) { 
       int typeAct = extras.getInt("activity");
       if (typeAct == 1) {
.......