触发其他微调器的微调器 [英] Spinner that trigger other spinner

问题描述

我想用两个微调器创建一个应用程序.当您选择第一个微调器中的一个项目时，第二个微调器将仅获得几个项目(取决于所选的项目).

I want to create an application with two Spinners. When you select one of the items inside the first spinner, the second spinner will get only a few items (depends on which item selected).

例如:在第一个微调器中，我选择"Mazda"，然后在第二个微调器中，我将只能看到Mazda的模型，而不能看到BMW，Ford等.我可以这样做吗?

For example: in the first spinner I select "Mazda", and then on the second I will be able to see only Mazda's models, not BMW, Ford etc. Can I do something like this?

我试图创建一个没有项目的微调器，并在选择了项时在XML上设置微调器的条目，但是没有方法可以做到这一点.

I tried to create a spinner without items, and set the entries of the spinner on the XML when item selected, but there is no method to do this.

我不创建列表.我想在我的strings.xml中创建string-array资源，并将该数组提供给第二个微调器.

I don't create Lists. I want to create string-array resources in my strings.xml, and give that array to the second spinner.

推荐答案

尝试以下代码.我已经在HashMap中组织了示例数据，但是您可以按照自己的方式进行操作.

Try following code. I've organized the sample data in a HashMap but you can do it in your own way.

    // hashmap object containing data of spinner1 as 'keys' with relevant  
    // data of spinner2 in List<String> object as 'values'
    final Map<String, List<String>> data = new HashMap<>();
    data.put("A", Arrays.asList("1","2","3","4"));
    data.put("B", Arrays.asList("4", "5"));
    data.put("C", Arrays.asList("6", "7", "8", "9"));
    data.put("D", Arrays.asList("10", "11", "12"));
    data.put("E", Arrays.asList("13", "14"));

    // obtaining a string array containing keys(data of spinner1) of above hashmap
    final String[] dataSpinner1 = new String[data.keySet().size()];
    data.keySet().toArray(dataSpinner1);

    // initializing an string type, ArrayAdapter for spinner1 
    // you will need to pass activity context, layout for the spinner item and 
    // spinner content(as string array) as arguments to create an array adapter 
    final ArrayAdapter<String> spinner1Adapter = new ArrayAdapter<String>(context, R.layout.spinner_layout, dataSpinner1);
    spinner1.setAdapter(spinner1Adapter);

    // setting listner for spinner1 to trigger when an spinner item is being 
    // clicked by the user  
    spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            // obtaining relevant data for spinner2 
            List<String> dataSpinner2 = data.get(dataSpinner1[position]);

            // crating an setting array adapter for spinner2
            ArrayAdapter<String> spinner2Adapter = new ArrayAdapter<String>(context, R.layout.spinner_layout, dataSpinner2);
            spinner2.setAdapter(spinner2Adapter);
        }

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

        }
    });

这篇关于触发其他微调器的微调器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！