Categories: java, android

Spinner how to change the data

1 answer

I initially have 2 spinners in my project. I want to change the data of the 2nd Spinner when the first spinner values are changed. Here's what I have tried.

Spinner subscription = findViewById(R.id.spinner_subscription);     items_subscription = new String[]{"Daily"};     ArrayAdapter<String> adapter_subscriptions = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, items_subscription);     subscription.setAdapter(adapter_subscriptions);      payment_method.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {         @Override         public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {             if(position == 0){                 items_subscription = new String[]{"Daily"};             }else if(position == 1){                 items_subscription = new String[]{"Monthly", "Annually"};             }else if(position == 2){                 items_subscription = new String[]{"Monthly", "Annually"};             }else{                 items_subscription = new String[]{"Daily"};             }              adapter_subscriptions.notifyDataSetChanged();             subscription.setAdapter(adapter_subscriptions);         }          @Override         public void onNothingSelected(AdapterView<?> parent) {          }     });

And the above doesn't work. It only ads "Daily" on load, and when Spinner1 values change, the spinner2 values do not change. How can I achieve the following ?

All answers to this question, which has the identifier 61238965

The best answer:

This happens because you changed the reference to the array items_subscription of your adapter when you reassigned it in inside onItemSelected, now your adapter_subscriptions doesn't have the same object as the array and you're modifying a data that the adapter has no knowledge about it. It's better to have an array list, clear it, and fill it with new data when they're changed then call adapter.notifyDataSetChanged().

ArrayList<String> items_subscription = new ArrayList<>(); // add your objects to the list and initialize the adapter // ... public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {     items_subscription.clear();     if(position == 0){         items_subscription.add("Daily");     }     // ...etc      adapter_subscriptions.notifyDataSetChanged(); }

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