How to handle multiple intents in a single activity in android?

Question

I have Three activity classes in my android Application . The first activity has to pass intent to the second and third activity one has to pass intent to the second. In this case ,How can i handle two intents in the same activity . I thought i should use the if ,else condition . But i doubt if there is some technique to handle multiple intents in a single activity?

Answer 1

Use startActivityForResult() and onActivityResult(). This is your solution.

Answer 2

Just a simple if else condition :

if (intent.getStringExtra("com.example.ActivityOne.intentOne") != null) {
   // do something
} else if (intent.getStringExtra("com.example.ActivityThree.intentThree") != null) {
   // do something else
}

Answer 3

If you just want to know which Activity issued the current Intent to know what extras to expect or to know what to do I will sometimes just use an arbitrary String extra and check what that is. So in sending Activity something like

Intent i = new Intent(FirstActivity.this, NextActivtiy.class);
i.putExtra("source", "first");  // source is the string to check where it is coming from
startActivity(i);

Then in the receiving Activity

Intent intent = getIntent();
String from = intent.getStringExtra("source");
if ("first".equals(from))
{
     // do stuff if from first Activity
}
else
{
     // do other stuff
}

Check if extras is not null

 if (intent.getExtras() != null) {
    String from = intent.getStringExtra("source");
    if ("first".equals(from)){
        // do stuff if from first Activity
    }
    else {
        // do other stuff
    }
}