The use of android-spinner drop-down box

1. Add the spinner mark in the xml file

2. Get the control in the java file, and get some data at the same time

3. Come to an arrayadapter adapter, bind the adapter

4. Add monitoring events

5. The total code

spinner1 = this.findViewById(R.id.spinner);
        List<String> list = new ArrayList<>();
        list.add("体育");
        list.add("音乐");
        list.add("文学");
        list.add("礼仪");
        ArrayAdapter adapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_spinner_item, list);
        spinner1.setAdapter(adapter);

        spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    
    
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    
    
                switch (position){
    
    
                    case 0:
                        Toast.makeText(MainActivity.this,"你点击了体育",Toast.LENGTH_SHORT).show();
                        break;
                    case 1:
                        Toast.makeText(MainActivity.this,"你点击了音乐",Toast.LENGTH_SHORT).show();
                        break;
                    case 2:
                        Toast.makeText(MainActivity.this,"你点击了文学",Toast.LENGTH_SHORT).show();
                        break;
                    case 3:
                        Toast.makeText(MainActivity.this,"你点击了礼仪",Toast.LENGTH_SHORT).show();
                        break;
                }
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
    
    

            }
        });

effect: