Pass a value in a secondary activity android

Question

I created in my Android project another activity. I execute it using this code(this is written in my main activity):

activity2 = new Intent(MainActivity.this, SecondaryActivity.class);
startActivity(activity2);

The problem is that I need to pass a value to the new activity. I've done it creating a public static value in the secondary activity. Can I do it in a different way?

Have you searched before posting this question? http://stackoverflow.com/questions/2091465/how-do-i-pass-data-between-activities-in-android-application/2091482 — Denny, May 18 '17 at 06:56
No OP has not searched before because if it was then OP won't frame the question. — jack jay, May 18 '17 at 06:57
Not just memory, when using static variables to hold flags and programming around those flags, managing a piece of code few months down the road becomes a nightmare. — Farhan, May 18 '17 at 06:58
@jackjay, not only memory. When using the same method from different classes, static variables keep only the last values. — CoolMind, May 18 '17 at 06:58

score 2 · Accepted Answer · answered May 18 '17 at 06:56

2

Use Intent extras :

Intent intent = new Intent(MainActivity.this, SecondaryActivity.class);
intent.putExtra("keyName","value");
startActivity(intent);

Then in SecondaryActivity's onCreate method, get value like this :

String data = getIntent().getExtras().getString("keyName");

answered May 18 '17 at 06:56

Farhan

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Now it doesn't allow me to accept the answer, I will do it in 10 min – EmLe49 May 18 '17 at 06:58
2

Check `getIntent().getExtras() != null`. – CoolMind May 18 '17 at 07:00

score 1 · Answer 2 · edited May 18 '17 at 07:02

Try like this.

Intent activity2 = new Intent(MainActivity.this, SecondaryActivity.class);
activity2.putExtra("key", "value")
startActivity(activity2);

In SecondaryActivity.class

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //getData using key
    String value = getIntent().getStringExtras("key");
}

score 1 · Answer 3 · answered May 18 '17 at 07:08

You can use Intent extras to pass value to your SecondaryActivity:

SEND:

// MainActivity.java

Intent intent = new Intent(MainActivity.this, SecondaryActivity.class);
intent.putExtra("KEY_VALUE", "Some value");
startActivity(intent);

RECEIVE:

// SecondaryActivity.java

@Override 
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    .........
    ..................

    String value = "";
    if(getIntent().getExtras() != null)
        value = getIntent().getExtras().getString("KEY_VALUE");

    // Do something with value
}

Pass a value in a secondary activity android

3 Answers3