如何從複合控件android spinner類獲取微調項目到主要活動？

Question

我正在嘗試從主活動中呈現的自定義複合微調器中獲取項目值。在輸出中可能選擇微調器的下拉列表，但項目捕捉不發生請給我下面的解決方案是代碼片段。

定製/複合控制類

public class CompounControlSpinner extends Spinner { 
    private String[] items = { 
      "Google", "IBM", "Microsoft", "Accenture", "Cisco", "Dell", "Oracle", "Facebook" 
    }; 
    public ComContSpinner(Context context, AttributeSet attrs) { 
     super(context, attrs); 
     this.setAdapter(new ArrayAdapter(context, android.R.layout.simple_spinner_item, items)); 
     this.setOnItemSelectedListener(new OnItemSelectedListener(){ 

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


      } 

      @Override 
      public void onNothingSelected(AdapterView<?> parent) { 
       // TODO Auto-generated method stub 

      } 

     }); 
    } 

} 

主要XML

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.mysmax.compouncontrolspinner.MainActivity" > 

    <TextView 
     android:id="@+id/text1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textStyle="bold" 
     android:textAppearance="?android:attr/textAppearanceLarge" 
     android:text="Select Your Company" /> 

    <com.mysmax.compouncontrolspinner.ComContSpinner 
     android:id="@+id/spinner1" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/text1" 
     android:layout_below="@+id/text1" 
     android:layout_marginTop="31dp" /> 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignRight="@+id/text1" 
     android:layout_below="@+id/spinner1" 
     android:layout_marginRight="27dp" 
     android:layout_marginTop="40dp" 
     android:text="Done" /> 

</RelativeLayout> 

主要活動類

public class MainActivity extends ActionBarActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     new CompounControlSpinner(this, null); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 
} 

請任何一個建議我如何從主要活動獲取數據微調時，我選擇它應該在主要活動中動態更新的項目。提前謝謝。

Answer 1

...當我選擇它應該動態更新主 活動的項目。

當您在自定義視圖中獲得活動引用時，您可以簡單地使用它作爲接口，在發生選擇事件（並傳遞選定值）時與它進行通信。你可以這樣象下面這樣：

public interface SelectionHappened { 

    void onSelection(String newSelectedItem); 
} 

活動需要實現這個接口：

public class MainActivity extends ActionBarActivity implements SelectionHappened { 
    //... current code 

    @Override 
    public void onSelection(String newSelectedItem) { 
     // when this method is triggered the user selected something in the Spinner 
    } 

} 

最後一個項目是發送從自定義視圖中的事件：

public class CompounControlSpinner extends Spinner { 
    private SelectionHappened mListener; 
    private String[] items = { 
      "Google", "IBM", "Microsoft", "Accenture", "Cisco", "Dell", "Oracle", "Facebook" 
    }; 
    public ComContSpinner(Context context, AttributeSet attrs) { 
     super(context, attrs); 
     mListener = (SelectionHappened) context; 
     this.setAdapter(new ArrayAdapter(context, android.R.layout.simple_spinner_item, items)); 
     this.setOnItemSelectedListener(new OnItemSelectedListener(){ 

      @Override 
      public void onItemSelected(AdapterView<?> parent, View view, 
        int position, long id) { 
        mListener.onSelection((String)parent.getAdapter().getItem(position)); // send the event to the activity 
      } 
     //... rest of the current code