Question

我是android新手。我试图构建一个有2个微调器的应用程序... 在深入了解我的申请之前，我几乎没有疑问。

请简要回答我的问题......

在一个视图中可以有2个微调器吗？
我可以为这两个添加setOnItemSelectedListener(this)吗？
如果是，我怎么知道两个纺纱厂都选择了哪个选项？像两个微调器上的spinner.getSelectedItemPosition();一样？

等待你的宝贵回复。参考资料也很明显

Answer 1

是的，您可以拥有多个可以由单个侦听器管理的微调器，或者您可以为每个微调器分别配置一个侦听器。

对于Single Listener，你可以做这样的事情，

设置监听器

spinner1.setOnItemSelectedListener(this);
spinner2.setOnItemSelectedListener(this);

然后您可以使用onItemSelected来执行与微调器相关的操作。

    @Override
        public void onItemSelected(AdapterView<?> parent, View view,
                                                      int position,long arg3) 
        {
        int id = parent.getId();
        switch (id) 
        {
                case R.id.spinner1:
                // your stuff here
                break;
            case R.id.spinner2:
               // your stuff here
            break;
        }

Answer 2

检查一下：

Spinner spinner0，spinner1，spinner2; TextView textView0，textView1，textView2;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    textView0 = (TextView) findViewById(R.id.text0);
    spinner0 = (Spinner) findViewById(R.id.spinner0);

    ArrayAdapter<String> adapter0 = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, text0);
    adapter0.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner0.setAdapter(adapter0);
    spinner0.setOnItemSelectedListener(onItemSelectedListener0);

    textView1 = (TextView) findViewById(R.id.text1);
    spinner1 = (Spinner) findViewById(R.id.spinner1);
    ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, text1);
    adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner1.setAdapter(adapter1);
    spinner1.setSelection(0,false); //make sure only one listener is

//通过将另一个侦听器设置为false，在onCreate方法中处于活动状态 spinner1.setOnItemSelectedListener（onItemSelectedListener1）;

    textView2 = (TextView) findViewById(R.id.text2);
    spinner2 = (Spinner) findViewById(R.id.spinner2);
    MySpinnerAdapter adapter2 = new MySpinnerAdapter(MainActivity.this, android.R.layout.simple_spinner_item, obj2);
    //adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner2.setAdapter(adapter2);
   spinner2.setSelection(0,false);
    spinner2.setOnItemSelectedListener(onItemSelectedListener2);

}

OnItemSelectedListener onItemSelectedListener0 = new OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
      //do your stuff spinner0
    }

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

OnItemSelectedListener onItemSelectedListener1 = new OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        //do your stuff spinner1
    }

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

};

OnItemSelectedListener onItemSelectedListener2 = new OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        //do your stuff spinner2
    }

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

};

}

Answer 3

如果两个微调器的引用不同（如果你使用2个微调器），则为它们提供不同的ID，你可以唯一地识别它们，是的，你可以单独设置它们的点击监听器。

spinner.setOnItemSelectedListener(new OnItemSelectedListener() { ... } );
spinner1.setOnItemSelectedListener(new OnItemSelectedListener() { ... } );

Answer 4

是
是
spinner1.getSelectedItemPosition()，spinner2.getSelectedItemPosition()

多个微调器的简单疑惑

4 个答案: