如何将数据从活动传递到片段

Question

In my project I have to pass some data in a fragment activity . How do i do that ? I have tried like this :

String json_string = "s";
Intent intent = new Intent(context, ShowMapFragement.class);
intent.putExtra("json_data", json_string);
context.startActivity(intent);

But it's not working properly. Please help me.

Answer 1

Here is one way to pass data from an Activity to a Fragment:

Create a static newInstance() method in the Fragment class:

public static MyFragment newInstance(String valueToPass) {
    MyFragment instance = new MyFragment();
    Bundle args = new Bundle();
    args.putString("key", valueToPass);
    instance.setArguments(args)
    return instance;
}

Pass the data from the Activity/Fragment to MyFragment like so:

MyFragment myFragment = MyFragment.newInstance("Hello World");

Then you can do this to retrieve the data (any time after Fragment.onCreate())

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

       if (getArguments() != null) {
           String passedValue = getArguments().getString("key");
           // passedValue == "Hello World"
       }   
   }