Android Spinner有多种选择

Question

如何创建允许选择多个项目的微调器，即带有复选框的微调器？

Answer 1

我编写了MultiSpinner的自定义实现。它看起来类似于普通的微调器，但它有复选框而不是radiobuttons。选定的值显示在微调器上除以逗号。默认情况下会检查所有值。试试吧：

package cz.destil.settleup.gui;

public class MultiSpinner extends Spinner implements
        OnMultiChoiceClickListener, OnCancelListener {

    private List<String> items;
    private boolean[] selected;
    private String defaultText;
    private MultiSpinnerListener listener;

    public MultiSpinner(Context context) {
        super(context);
    }

    public MultiSpinner(Context arg0, AttributeSet arg1) {
        super(arg0, arg1);
    }

    public MultiSpinner(Context arg0, AttributeSet arg1, int arg2) {
        super(arg0, arg1, arg2);
    }

    @Override
    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
        if (isChecked)
            selected[which] = true;
        else
            selected[which] = false;
    }

    @Override
    public void onCancel(DialogInterface dialog) {
        // refresh text on spinner
        StringBuffer spinnerBuffer = new StringBuffer();
        boolean someUnselected = false;
        for (int i = 0; i < items.size(); i++) {
            if (selected[i] == true) {
                spinnerBuffer.append(items.get(i));
                spinnerBuffer.append(", ");
            } else {
                someUnselected = true;
            }
        }
        String spinnerText;
        if (someUnselected) {
            spinnerText = spinnerBuffer.toString();
            if (spinnerText.length() > 2)
                spinnerText = spinnerText.substring(0, spinnerText.length() - 2);
        } else {
            spinnerText = defaultText;
        }
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getContext(),
                android.R.layout.simple_spinner_item,
                new String[] { spinnerText });
        setAdapter(adapter);
        listener.onItemsSelected(selected);
    }

    @Override
    public boolean performClick() {
        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
        builder.setMultiChoiceItems(
                items.toArray(new CharSequence[items.size()]), selected, this);
        builder.setPositiveButton(android.R.string.ok,
                new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });
        builder.setOnCancelListener(this);
        builder.show();
        return true;
    }

    public void setItems(List<String> items, String allText,
            MultiSpinnerListener listener) {
        this.items = items;
        this.defaultText = allText;
        this.listener = listener;

        // all selected by default
        selected = new boolean[items.size()];
        for (int i = 0; i < selected.length; i++)
            selected[i] = true;

        // all text on the spinner
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getContext(),
                android.R.layout.simple_spinner_item, new String[] { allText });
        setAdapter(adapter);
    }

    public interface MultiSpinnerListener {
        public void onItemsSelected(boolean[] selected);
    }
}

您可以在XML中使用它：

<cz.destil.settleup.gui.MultiSpinner android:id="@+id/multi_spinner" />

你用Java将数据传递给它：

MultiSpinner multiSpinner = (MultiSpinner) findViewById(R.id.multi_spinner);
multiSpinner.setItems(items, getString(R.string.for_all), this);

此外，您需要实现侦听器，该侦听器将返回相同长度的数组，使用true或false来显示所选的未选定的数据。

public void onItemsSelected(boolean[] selected);

Answer 2

我只想展示另一个版本的@Destil的MultiSpinner（感谢您鼓舞人心的代码），它允许使用＆＃34; android：entries＆＃34;在xml中，就像一个微调器。

它最初不显示默认文本，例如＆＃34;选择一个＆＃34;，但您可以通过在构造函数中设置其他ArrayAdapter轻松获取它。

<强> MultiSpinner.java

package com.example.helloworld;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnMultiChoiceClickListener;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

/**
 * Inspired by: http://stackoverflow.com/a/6022474/1521064
 */
public class MultiSpinner extends Spinner {

    private CharSequence[] entries;
    private boolean[] selected;
    private MultiSpinnerListener listener;

    public MultiSpinner(Context context, AttributeSet attrs) {
        super(context, attrs);

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MultiSpinner);
        entries = a.getTextArray(R.styleable.MultiSpinner_android_entries);
        if (entries != null) {
            selected = new boolean[entries.length]; // false-filled by default
        }
        a.recycle();
    }

    private OnMultiChoiceClickListener mOnMultiChoiceClickListener = new OnMultiChoiceClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which, boolean isChecked) {
            selected[which] = isChecked;
        }
    };

    private DialogInterface.OnClickListener mOnClickListener = new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            // build new spinner text & delimiter management
            StringBuffer spinnerBuffer = new StringBuffer();
            for (int i = 0; i < entries.length; i++) {
                if (selected[i]) {
                    spinnerBuffer.append(entries[i]);
                    spinnerBuffer.append(", ");
                }
            }

            // Remove trailing comma
            if (spinnerBuffer.length() > 2) {
                spinnerBuffer.setLength(spinnerBuffer.length() - 2);
            }

            // display new text
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(getContext(),
                    android.R.layout.simple_spinner_item,
                    new String[] { spinnerBuffer.toString() });
            setAdapter(adapter);

            if (listener != null) {
                listener.onItemsSelected(selected);
            }

            // hide dialog
            dialog.dismiss();
        }
    };

    @Override
    public boolean performClick() {
        new AlertDialog.Builder(getContext())
                .setMultiChoiceItems(entries, selected, mOnMultiChoiceClickListener)
                .setPositiveButton(android.R.string.ok, mOnClickListener)
                .show();
        return true;
    }

    public void setMultiSpinnerListener(MultiSpinnerListener listener) {
        this.listener = listener;
    }

    public interface MultiSpinnerListener {
        public void onItemsSelected(boolean[] selected);
    }
}

<强> attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="MultiSpinner">
        <attr name="android:entries" />
    </declare-styleable>
</resources>

<强> layout_main_activity.xml

<com.example.helloworld.MultiSpinner
    android:id="@+id/multispinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:entries="@array/multispinner_entries" />

Answer 3

据我所知Spinner没有多选模式。相反，您可以创建ImageButton并在右侧设置可绘制向下箭头，在点击事件中，您可以打开包含多个复选框的Dialog项目。

请参阅此处：Android Multi Selection Dialogs

Answer 4

谢谢你的帖子！好的解决方案我对类（方法setItems）做了一些小改动，允许用户设置已选择的项目，而不是默认选择所有项目为真。

public void setItems(
    List<String> items,
    List<String> itemValues, 
    String selectedList,
    String allText,
    MultiSpinnerListener listener) {
        this.items = items;
        this.defaultText = allText;
        this.listener = listener;

        String spinnerText = allText;

        // Set false by default
        selected = new boolean[itemValues.size()];
        for (int j = 0; j < itemValues.size(); j++)
            selected[j] = false;

        if (selectedList != null) {
            spinnerText = "";
            // Extract selected items
            String[] selectedItems = selectedList.trim().split(",");

            // Set selected items to true
            for (int i = 0; i < selectedItems.length; i++)
                for (int j = 0; j < itemValues.size(); j++)
                    if (selectedItems[i].trim().equals(itemValues.get(j))) {
                        selected[j] = true;
                        spinnerText += (spinnerText.equals("")?"":", ") + items.get(j);
                        break;
                }
    }

        // Text for the spinner
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getContext(),
            android.R.layout.simple_spinner_item, new String[] { spinnerText });
        setAdapter(adapter);
}

Answer 5

您可以检查一个简单的库MultiSelectSpinner

您只需执行以下步骤：

multiSelectSpinnerWithSearch.setItems(listArray1, new MultiSpinnerListener() {
    @Override
    public void onItemsSelected(List<KeyPairBoolData> items) {
        for (int i = 0; i < items.size(); i++) {
            if (items.get(i).isSelected()) {
                Log.i(TAG, i + " : " + items.get(i).getName() + " : " + items.get(i).isSelected());
            }
        }
    }
});

listArray1将成为您的数组。

在How-To

中查看完整的示例