Start an Activity with a parameter

Question

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

[android] Start an Activity with a parameter

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