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I'm very new on Android development.

I want to create and start an activity to show information about a game. I show that information I need a gameId.

How can I pass this game ID to the activity? The game ID is absolutely necessary so I don't want to create or start the activity if it doesn't have the ID.

It's like the activity has got only one constructor with one parameter.

How can I do that?

Thanks.

Put an int which is your id into the new Intent.

Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
Bundle b = new Bundle();
b.putInt("key", 1); //Your id
intent.putExtras(b); //Put your id to your next Intent
startActivity(intent);
finish();

Then grab the id in your new Activity:

Bundle b = getIntent().getExtras();
int value = -1; // or other values
if(b != null)
    value = b.getInt("key");

How to Start New Activity With Parameters on an Android, If you need to pass data parameters into these activities when you launch them, you can use the "putExtra" and "getExtras" methods of the intent class. This way  Start Activity For Result Activity. Start Activity For Result Method Definition. Namespace: Parameters. intent Intent Intent. The intent to start. requestCode

Just add extra data to the Intent you use to call your activity.

In the caller activity :

Intent i = new Intent(this, TheNextActivity.class);
i.putExtra("id", id);
startActivity(i);

Inside the onCreate() of the activity you call :

Bundle b = getIntent().getExtras();
int id = b.getInt("id");

Edit : Oops, Charlie Sheen was quicker.

Start another activity, Overview · Create a notification · Create an expandable notification · Display time​-sensitive notifications · Start an activity from a notification  To start new (another) Android Activity from an Activity : In the current Activity, create an Intent with current Activity’s context and Next Activity Class passed as arguments.val intent = Intent(this, AnotherActivity::class.java) Call startActivity() method with intent passed as argument.

I like to do it with a static method in the second activity:

private static final String EXTRA_GAME_ID = "your.package.gameId";

public static void start(Context context, String gameId) {
    Intent intent = new Intent(context, SecondActivity.class);
    intent.putExtra(EXTRA_GAME_ID, gameId);
    context.startActivity(intent);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    ... 
    Intent intent = this.getIntent();
    String gameId = intent.getStringExtra(EXTRA_GAME_ID);
}

Then from your first activity (and for anywhere else), you just do:

SecondActivity.start(this, "the.game.id");

Passing data between Activities using Intent in Android, If we have to open one activity from another activity we have to add an Intent code putExtra() : This method sends the data to another activity and in parameter,  To start an Activity in java we wrote Intent(this, Page2.class), basically you have to define Context in first parameter and destination class in second parameter. According to Intent method in source code - public Intent(Context packageContext, Class<?> cls) As you can see we have to pass Class<?> type in second parameter.

The existing answers (pass the data in the Intent passed to startActivity()) show the normal way to solve this problem. There is another solution that can be used in the odd case where you're creating an Activity that will be started by another app (for example, one of the edit activities in a Tasker plugin) and therefore do not control the Intent which launches the Activity.

You can create a base-class Activity that has a constructor with a parameter, then a derived class that has a default constructor which calls the base-class constructor with a value, as so:

class BaseActivity extends Activity
{
    public BaseActivity(String param)
    {
        // Do something with param
    }
}

class DerivedActivity extends BaseActivity
{
    public DerivedActivity()
    {
        super("parameter");
    }
}

If you need to generate the parameter to pass to the base-class constructor, simply replace the hard-coded value with a function call that returns the correct value to pass.

How to Open a New Activity and Pass Variables to It, In this Video we are going to learn, how to open a new Activity (for example by clicking a Duration: 12:22 Posted: Oct 21, 2017 The android startActivityForResult method, requires a result from the second activity (activity to be invoked). In such case, we need to override the onActivityResult method that is invoked automatically when second activity returns result. Method Signature. There are two variants of startActivityForResult() method.

Kotlin code:

Start the SecondActivity:

startActivity(Intent(context, SecondActivity::class.java)
    .putExtra(SecondActivity.PARAM_GAME_ID, gameId))

Get the Id in SecondActivity:

class CaptureActivity : AppCompatActivity() {

    companion object {
        const val PARAM_GAME_ID = "PARAM_GAME_ID"
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val gameId = intent.getStringExtra(PARAM_GAME_ID)
        // TODO use gameId
    }
}

where gameId is String? (can be null)

How to Pass Data from One Activity to Another in Android, How do you pass data from one activity to another activity? Passing data from one Activity to Activity in android. An intent contains the action and optionally additional data. The data can be passed to other activity using intent putExtra() method. Data is passed as extras and are key/value pairs. The key is always a String. As value you can use the primitive data types int, float, chars, etc.

Android Intents - Tutorial, is passed in key value pair. The value can be of types like int, float, long, string, etc. In the Activity diagram palette, click the arrow next to the Object Node button to expand the list, then select Activity Parameter Node. Click the Activity diagram frame. The Activity Parameter Node is created, and its shortcut menu opens. Select Edit New Parameter to specify the parameter. The Parameter dialog opens. Specify the parameter, and click Close. The parameter for the Activity Parameter Node is created automatically.

Passing Data Between Activities Android Tutorial, connect to the # specified class Intent i = new Intent(this, ActivityTwo. Inside the sendMessage() method, create an Intent to start an activity called DisplayMessageActivity : A Context as its first parameter (this is used because the Activity class is a subclass of Context) For more information, see the class about Interacting with Other Apps.

Navigating Activities with Intents, The first parameter can be android.app.Activity.RESULT_OK or READ : Android Activity Launch Mode SingleTask SingleInstance Example. I am trying to pass parameter of item model from one Activity and display it in another Activity. The code for the item class: This site uses cookies for analytics, personalized content and ads.

Comments
  • You may want to make sure b != null before you start grabbing from it
  • How can "b" be null in second activity in this code? I get b is null on create method of second activity.
  • B can be null, lets say you want to start this activity from another place and you do it the standard way, with no params. It will throw a NPE. You should always consider this params optional.
  • It is not necessary to create a new Bundle (and if you do the documentation says you "must" use the package name to prefix your keys.) Simply use intent.putExtra(String, Int).
  • One could argue that its better not to do a null check. en.wikipedia.org/wiki/Fail-fast.
  • is it okay to pass in a custom object type ?
  • @Amyth No, you have to use a bundle like in the accepted answer.
  • See this @Amyth : stackoverflow.com/questions/14333449/…
  • Exactly what I was looking for! Thank you
  • In the onCreate method shouldn't String gameId = intent.getStringExtra(EXTRA_EXTERNAL_ID); be String gameId = intent.getStringExtra(EXTRA_GAME_ID);
  • Having statics will make Your testing very hard.
  • Is this a memory leak? Passing the context into a static method seems like a bad idea to me. Why not just return the intent and then start the activity using that intent from the first class?