36

我想显示性别选择的下拉菜单。我传递了一个字符串数组作为

String arr[]=new String[]{"male","female"};

但问题是显示默认选择的值，"male"我想显示"Gender"为默认值。如果我在位置 0 的数组中传递“性别”，那么它在下拉列表中也可见。我只想要“性别”作为提示，但它不能显示在下拉列表中。

谁能告诉我如何做到这一点。提前致谢。

4

4 回答 4

65 
Spinner sp = (Spinner)findViewById(R.id.spinner); 
sp.setSelection(pos);

这里 pos 是整数（你的数组项位置）

数组就像下面那样pos = 0;

String str[] = new String{"Select Gender","male", "female" };

然后在 onItemSelected

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

        if(position > 0){
          // get spinner value
        }else{
          // show toast select gender
        }

    }
于 2013-06-12T10:53:58.630 回答
2

我通过扩展ArrayAdapter和覆盖该getView方法找到了解决方案。

import android.content.Context;
import android.support.annotation.NonNull;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

/**
 * A SpinnerAdapter which does not show the value of the initial selection initially,
 * but an initialText.
 * To use the spinner with initial selection instead call notifyDataSetChanged().
 */
public class SpinnerAdapterWithInitialText<T> extends ArrayAdapter<T> {

    private Context context;
    private int resource;

    private boolean initialTextWasShown = false;
    private String initialText = "Please select";

    /**
     * Constructor
     *
     * @param context The current context.
     * @param resource The resource ID for a layout file containing a TextView to use when
     *                 instantiating views.
     * @param objects The objects to represent in the ListView.
     */
    public SpinnerAdapterWithInitialText(@NonNull Context context, int resource, @NonNull T[] objects) {
        super(context, resource, objects);
        this.context = context;
        this.resource = resource;
    }

    /**
     * Returns whether the user has selected a spinner item, or if still the initial text is shown.
     * @param spinner The spinner the SpinnerAdapterWithInitialText is assigned to.
     * @return true if the user has selected a spinner item, false if not.
     */
    public boolean selectionMade(Spinner spinner) {
        return !((TextView)spinner.getSelectedView()).getText().toString().equals(initialText);
    }

    /**
     * Returns a TextView with the initialText the first time getView is called.
     * So the Spinner has an initialText which does not represent the selected item.
     * To use the spinner with initial selection instead call notifyDataSetChanged(),
     * after assigning the SpinnerAdapterWithInitialText.
     */
    @Override
    public View getView(int position, View recycle, ViewGroup container) {
        if(initialTextWasShown) {
            return super.getView(position, recycle, container);
        } else {
            initialTextWasShown = true;
            LayoutInflater inflater = LayoutInflater.from(context);
            final View view = inflater.inflate(resource, container, false);

            ((TextView) view).setText(initialText);

            return view;
        }
    }
}

Android 在初始化 Spinner 时所做的是，在为T[] objects. SpinnerAdapterWithInitialText返回 aTextView和，第initialText一次调用它。如果您正常使用 Spinner，则它调用的所有其他时间都是调用super.getView的getView方法。ArrayAdapter

要确定用户是否选择了微调器项目，或者微调器是否仍显示initialText，请调用selectionMade并移交适配器分配给的微调器。

于 2018-02-09T10:00:35.770 回答
0

微调器不支持提示，我建议您制作自定义微调器适配器。

检查此链接：https ://stackoverflow.com/a/13878692/1725748

于 2013-06-12T10:58:44.100 回答
-6

试试下面：

   <Spinner
    android:id="@+id/YourSpinnerId"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:prompt="Gender" />
于 2013-06-12T11:12:27.147 回答