Question

我正在尝试从主活动上呈现的自定义复合微调器获取项值。在输出中可以选择微调器的下拉列表，但项目捕获没有发生请在下面给我解决方案是代码片段。

自定义/复合控制类

 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>

主要活动类

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);
    }
}

当我选择它应该在主要活动中动态更新的项目时，请任何人建议我如何从微调器获取主活动中的数据。提前谢谢。

Answer 1

...当我选择项目时，它应该在main中动态更新活性。

当你在自定义视图中获得Activity引用时，你可以简单地使用它作为一个接口，在选择事件发生时与它进行通信（并传递选定的值）。你可以这样：

public interface SelectionHappened {

    void onSelection(String newSelectedItem);
}

活动需要实现此界面：

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   
    }

}

最后一项是从自定义视图发送事件：

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

如何从Compound Control android spinner类中获取微调项目到主要活动？

1 个答案: