Question

我想显示性别选择的下拉列表。我传递了一个字符串数组

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

但问题是显示默认选择的值为"male"，我想将"Gender"显示为默认值。如果我在位置0的数组中传递“Gender”，那么它也会在下拉列表中显示。我只想要“性别”作为提示，但不能在下拉列表中显示。

任何人都可以告诉我如何做到这一点。提前谢谢。

Answer 1

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

这里pos是整数（你的数组项位置）

数组如下所示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
        }

    }

Answer 2

我通过扩展ArrayAdapter并覆盖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;
        }
    }
}

在初始化Spinner时，Android会在为T[] objects中的所有项目调用getView之前调用所选项目的getView。第一次调用SpinnerAdapterWithInitialText时，TextView会返回initialText super.getView。所有其他时间它调用getView ArrayAdapter initialText方法，如果您正常使用微调器，则会调用selectionMade方法。

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No 'Access-Control-Allow-Origin' header，请调用Access-Control-Allow-Origin并移交适配器所指定的微调器。

Answer 3

Spinner不支持Hint，我建议你制作一个自定义微调器适配器。

点击此链接：https://stackoverflow.com/a/13878692/1725748

Answer 4

尝试以下：

   <Spinner
    android:id="@+id/YourSpinnerId"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:prompt="Gender" />

Answer 5

你可以设置微调器的提示...可以在xml中设置android：prompt =“Gender”

在android中的Spinner中显示默认值

5 个答案: