如何基于Spinner设置TextView的文本？

Question

My application has TextView and Spinner. Spinner contains 2 items (A and B). How do I set the text of TextView based on the selection of Spinner ? All these have to happen in one activity.

if(categoryType.getSelectedItem() == A){
            taxFee.setText("Total tax fee:RM" +  foodFee);
        }else{
            taxFee.setText("Total tax fee:RM" + groceryFee);
        }

I have tried the code above, it doesn't show the result I want. It always shows this statement taxFee.setText("Total tax fee:RM" + foodFee) even if I select other category.

Answer 1

It depends on your requirements, you can try this approach using the position:

categoryType.setOnItemSelectedListener(new OnItemSelectedListener()
{
    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1,
            int position, long id) {
        if(position == 0)
        {
            taxFee.setText("Total tax fee:RM" +  foodFee);
        }else{
            taxFee.setText("Total tax fee:RM" + groceryFee);
        }

    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        //something
    }

});

Answer 2

使其成为if（categoryType.getSelectedItem（）。toString（）。equals（A））

Answer 3

Why don't you put A in double quotes?

if(categoryType.getSelectedItem() == "A"){
    taxFee.setText("Total tax fee:RM" +  foodFee);
}else{
    taxFee.setText("Total tax fee:RM" + groceryFee);
}

or this

if(categoryType.getSelectedItem().toString().equals("A"))