Android Spinner 获取所选项目

Question

我在同一个活动中创建了 2 个微调器，

例如

1. 国家
2. 状态

无论何时，如果选择了国家/地区，它将显示一些国家/地区，例如日本、中国等...

如果我在另一个微调器中选择中国，它只显示中国的州和城市，或者如果我在另一个微调器中选择日本，它只显示日本的州

Answer 1

您可以通过以下方式获取当前选择的项目

String currentSelectedItem = mySpinner.getSelectedItem().toString();

OR

mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        Object item = parent.getItemAtPosition(position);
    }
    public void onNothingSelected(AdapterView<?> parent) {
    }
});

Answer 2

我在我的项目中做了同样的事情：

如果您使用的是从 JSON 获取 Country 数组，请按照以下步骤操作：

注意：确保您还获得country_id和state_id以将国家 ID 传递给您想要的相同请求参数

步骤 1：首先，您应该将所有国家/地区填入数组并设置国家/地区适配器

第 2 步：比你理解的onCreate()跳跃上的spinnerCountry.setAdapter()

第 3 步：在spinnerCountry.setOnItemSelectedListener()您将使用所选微调项的位置获取 country_id，将该 country_id 传递给状态请求参数以获取状态响应

第 4 步：这就是您获得状态响应并使用响应状态数组设置适配器spinnerState.setAdapter()

Answer 3

我最终在同一活动中添加了多重微调器的代码。

公共类 MainActivity 扩展 AppCompatActivity 实现 AdapterView.OnItemSelectedListener {

Spinner Cou, Sta, Cit;
Button button;
String name[]={"India","SriLanka"};
String flag1="India";
String flag2="SriLanka";
String flag3="Western Province";
String flag4="Central Province";
String flag5="Southern Province";
String name1[]={"Tamilnadu","kerala","karnataka"};
String name2[]={"Western","Central","Southern"};
String name3[]={"Colombo","Gampaha","Kalutara"};
String name4[]={"Kandy","Nuwara-Eliya","Matale"};
String name5[]={"Galle","Matara","Hambantota"};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Cou = (Spinner) findViewById(R.id.spinner);
    ArrayAdapter arrayAdapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name);
    Cou.setAdapter( arrayAdapter);
    Cou.setOnItemSelectedListener(this);

    Sta = (Spinner) findViewById(R.id.spinner2);
    ArrayAdapter aadapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name1);
    Sta.setAdapter(aadapter);
    Sta.setOnItemSelectedListener(this);

    Cit = (Spinner) findViewById(R.id.spinner3);
    ArrayAdapter barrayAdapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name2);
    Cit.setAdapter(barrayAdapter);
    Cit.setOnItemSelectedListener(this);

    Cit = (Spinner) findViewById(R.id.spinner3);
    ArrayAdapter carrayAdapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name3);
    Cit.setAdapter(carrayAdapter);
    Cit.setOnItemSelectedListener(this);

    Cit = (Spinner) findViewById(R.id.spinner3);
    ArrayAdapter darrayAdapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name4);
    Cit.setAdapter(darrayAdapter);
    Cit.setOnItemSelectedListener(this);

    Cit = (Spinner) findViewById(R.id.spinner3);
    ArrayAdapter earrayAdapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name5);
    Cit.setAdapter(earrayAdapter);
    Cit.setOnItemSelectedListener(this);

    button = (Button) findViewById(R.id.button);

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(MainActivity.this, Main2Activity.class);
            intent.putExtra("data", String.valueOf(Cou.getSelectedItem()));
            intent.putExtra("datam", String.valueOf(Sta.getSelectedItem()));
            intent.putExtra("datama", String.valueOf(Cit.getSelectedItem()));
            startActivity(intent);
        }
    });
}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

    Object item = parent.getItemAtPosition(position);
    /*Toast.makeText(getApplicationContext(), "Welcome" + item, Toast.LENGTH_SHORT).show();*/

    if(item=="India"){
        Sta = (Spinner) findViewById(R.id.spinner2);
        ArrayAdapter aadapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name1);
        Sta.setAdapter(aadapter);
        Sta.setOnItemSelectedListener(this);

    } else if(item=="SriLanka"){
        Sta = (Spinner) findViewById(R.id.spinner2);
        ArrayAdapter aadapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name2);
        Sta.setAdapter(aadapter);
        Sta.setOnItemSelectedListener(this);

    } else if(item=="Western"){
        Cit = (Spinner) findViewById(R.id.spinner3);
        ArrayAdapter carrayAdapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name3);
        Cit.setAdapter(carrayAdapter);
        Cit.setOnItemSelectedListener(this);
    } else if(item=="Central"){
        Cit = (Spinner) findViewById(R.id.spinner3);
        ArrayAdapter darrayAdapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name4);
        Cit.setAdapter(darrayAdapter);
        Cit.setOnItemSelectedListener(this);
    }else if(item=="Southern"){
        Cit = (Spinner) findViewById(R.id.spinner3);
        ArrayAdapter earrayAdapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,name5);
        Cit.setAdapter(earrayAdapter);
        Cit.setOnItemSelectedListener(this);
    }
}

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

}