Question

Can you please clarify me, what’s the best practice for this example:

Activity1 does INSERTS on SQLite and starts Activity2.

On Activity2, the user clicks on Back button and goes back to Activity1.
But instead of making INSERT, I want to make UPDATE to the data on SQLite.

How do I control, that user “came” back?

What’s the best practice?

Answer 1

Assume on button click you starting Activity 2

public static final int YOURCONSTANTNUMBER = 77;
   //Button Value
 Button second = (Button)findViewById(R.id.firstButton);
 second.setOnClickListner(this);

@Override
public void onClick(View v)
{
  switch(v.getId())
   {
      case R.id.btnSecondActivity:
      //Code for inserting data into database
      Intent secondactivity = new Intent(FirstActivity.this, SecondActivity.class);
      startActivity(secondactivity);
      break;
    }
}

In your second activity

To take control over the back button use the below code

 @Override
 public void onBackPressed()
 {      
//Code for update     
 } 

EDIT

Call your second activity with startActivityForResult() method which will let you know the result.

In First Activity

    Intent secondactivity = new Intent(FirstActivity.this, SecondActivity.class);
    startActivityForResult(secondactivity,YOURCONSTANTNUMBER);

Getting Result

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {  

 super.onActivityResult(requestCode, resultCode, data);   
 switch(requestCode)
 {
 case YOURCONSTANTNUMBER:
     // It will execute if you returning from second activity 
     //Update you database here
     }
 }

In Your Second Activity

Call this method were appropriate setResult(YOURCONSTANTNUMBER);

Hope it helps