多個微調器的簡單疑惑

Question

Im新的android。我曾試圖建立擁有2飛旋...... 我有一些懷疑前深去我的程序清除應用..

請作簡要回答我的問題......

1. 是在一個視圖中可能有2個旋轉器？
2. 我可以爲兩者添加setOnItemSelectedListener(this)嗎？
3. 如果是的話，我怎麼能知道在兩個spinners上選擇了哪個選項？像兩個spinners上的spinner.getSelectedItemPosition();？

等待你的寶貴回覆。參考資料也很明顯

Answer 1

是的，你可以有多個微調的，可以通過單一的監聽器來管理，或者你可以爲每個單獨的監聽器。

對於單監聽器，你可以做這樣的事情，

設置監聽

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

然後你可以使用onItemSelected得到執行與微調的動作。

@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

如果兩個spinners的引用不同（如果你使用2個spinners），給它們不同的ID，你可以唯一標識它們，是的，你可以設置單擊監聽器他們個人。

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

Answer 3

1. 是
2. 是
3. spinner1.getSelectedItemPosition()，spinner2.getSelectedItemPosition()

Answer 4

檢查：

微調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 

//活性在通過設置其他聽者爲假 spinner1.setOnItemSelectedListener（onItemSelectedListener1）的onCreate方法;

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) { 
    } 

}; 

}