带有微调器的Android Listview和一个复选框

Question

我是android开发的新手.我正在尝试创建一个包含微调器,编辑文本和复选框的List.微调器和复选框的数据来自数据库.我有以下文件.

NewTransac class which extends ListActivity {

private PayDbAdapter mDbHelper;
private  Spinner paySpinner;
private CheckBox mCheckBox;

@Override
protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.new_transac_listview);
     mDbHelper = new PayDbAdapter(this);
     mDbHelper.open();

     populatedata();
}

private void populatedata() {

    paySpinner = (Spinner)findViewById(R.id.payerspinner);
    mCheckBox = (CheckBox)findViewById(R.id.paidforcheckboxname);

    Cursor mCursor = mDbHelper.fetchAllTransactionValue();
    startManagingCursor(mCursor);

    // Create an array to specify the fields we want to display in the list.
    String[] from = new String[]{PayDbAdapter.KEY_NAME};

    int[] to = new int[]{android.R.id.text1};
    int[] cbto = new int[]{R.id.paidforcheckboxname};

    // Now create a simple cursor adapter and set it to display
    SimpleCursorAdapter adapter =
        new SimpleCursorAdapter(this, android.R.layout.simple_spinner_item, mCursor, from, to );

    adapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item );
    paySpinner.setAdapter(adapter);

    SimpleCursorAdapter cbAdapter =
        new SimpleCursorAdapter(this, R.layout.show_new_transac_data, mCursor, from, cbto );
    setListAdapter(cbAdapter);
}

列表视图xml

<ListView android:id="@android:id/list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:drawSelectorOnTop="false"
    android:textSize="14sp"
/>

<TextView android:id="@android:id/empty"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/no_friends"
    android:textSize="14sp"
/>

<Button android:id="@+id/confirmpay" 
    android:text="@string/confirm"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    android:gravity="center_vertical|center_horizontal" 
    android:layout_gravity="center_vertical|center_horizontal|center">
</Button>

列表视图填充xml

<TextView
    style="?android:attr/listSeparatorTextViewStyle"
    android:text="@string/listSeparatorPay"
    android:layout_marginTop="5dip"
    android:layout_marginBottom="5dip"
/>

<Spinner android:id="@+id/payerspinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:drawSelectorOnTop="true"
    android:prompt="@string/selectpayer"
/>

<TextView android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    android:text="@string/paytext"
/>

<EditText android:id="@+id/payamount" 
    android:layout_width="match_parent"
    android:layout_height="wrap_content" 
    android:layout_weight="1" 
    android:inputType="text"
/>

<TextView
    style="?android:attr/listSeparatorTextViewStyle"
    android:text="@string/listSeparatorPayedFor"
    android:layout_marginTop="5dip"
    android:layout_marginBottom="5dip"
/>

<CheckBox android:id="@+id/paidforcheckboxname"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
/>

<EditText android:id="@+id/paidforamount"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="number"
/>

Problem
我根据数据库中的字段数得到多个微调器,复选框和edittext.我看到我们无法为我为微调器设置的复选框设置适配器.我只需要一个带有一个编辑文本和多个复选框的微调器(数据库行总数).请帮忙!

Answer 1

编辑 - 请看评论,这个解决方案可能不正确

我知道这个问题很古老,但它是谷歌的第一个结果,我正在开发一个在ListView中使用Spinners的应用程序.我使用一些示例代码在这里开始.我希望这个例子能回答你的问题.我没有实现CheckBoxes,但它们与Spinner非常相似 - 实际上更容易.这个例子有一个带有TextView和Spinner的ListView.每当用户更改微调器中的选择时,TextView都会更改以反映这一点.

我将这个项目分为3个类:

• ListViewTestActivity - 主要活动
• DataAdapter - 扩展ArrayAdapter并用于显示ListView中的元素
• DataHolder - 只包含有关元素的一些信息的简单对象.这可以通过许多其他方式实施,以满足您的需求.

我修改/创建了3个关键的Android XML文件:

• main.xml - 修改 - 主要布局
• rowview.xml - 添加 - ListView中每个元素的布局
• strings.xml - modified - 默认的Android字符串文件

要从下到上,这个main.xml文件只包含一个ListView,而不是其他内容:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" 
    android:layout_width="fill_parent" android:layout_height="fill_parent">
    <ListView android:id="@+id/listView1" android:layout_height="match_parent" android:layout_width="match_parent" />
</LinearLayout>

这是rowview.xml.请记住,ListView中的每一行都重复此视图:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="wrap_content" android:weightSum="1">
    <TextView android:layout_width="wrap_content"
        android:layout_height="match_parent" android:id="@+id/text"
        android:layout_weight="0.5" android:textSize="25sp" />
    <Spinner android:layout_width="0dp" android:layout_height="wrap_content"
        android:id="@+id/spin" android:prompt="@string/choice_prompt"
        android:layout_weight="0.5" />
</LinearLayout>

strings.xml文件.我添加的是一个用于微调器内容的数组:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, ListViewTestActivity!</string>
    <string name="app_name">ListViewTest</string>
    <string name="choice_prompt">Select a choice</string>
    <string-array name="choices">
        <item>Alpha</item>
        <item>Bravo</item>
        <item>Charlie</item>
    </string-array>
</resources>

现在为有趣的东西.ListViewActivity类:

public class ListViewTestActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ListView listView = (ListView) findViewById(R.id.listView1);

        DataHolder data = new DataHolder(this);
        DataHolder data1 = new DataHolder(this);
        DataHolder data2 = new DataHolder(this);
        DataHolder data3 = new DataHolder(this);
        DataHolder data4 = new DataHolder(this);

        DataAdapter d = new DataAdapter(this, R.layout.rowview, new DataHolder[] { data, data1, data2, data3, data4 });

        listView.setAdapter(d);
    }
}

这很简单,你只需获取列表,制作一个新的适配器,并将ListView的适配器设置为你所做的那个.这是DataHolder类:

public class DataHolder {

    private int selected;
    private ArrayAdapter<CharSequence> adapter;

    public DataHolder(Context parent) {
        adapter = ArrayAdapter.createFromResource(parent, R.array.choices, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    }

    public ArrayAdapter<CharSequence> getAdapter() {
        return adapter;
    }

    public String getText() {
        return (String) adapter.getItem(selected);
    }

    public int getSelected() {
        return selected;
    }

    public void setSelected(int selected) {
        this.selected = selected;
    }

}

所有DataHolder类都会保存Spinner的适配器以及您可能要为ListView中的每个条目存储的任何其他信息(例如,您可能希望存储它是否被选中).最后是应用程序的真正"肉",DataAdapter类:

public class DataAdapter extends ArrayAdapter<DataHolder> {

    private Activity myContext;

    public DataAdapter(Activity context, int textViewResourceId, DataHolder[] objects) {
        super(context, textViewResourceId, objects);
        myContext = context;
    }

    // We keep this ViewHolder object to save time. It's quicker than findViewById() when repainting.
    static class ViewHolder {
        protected DataHolder data;
        protected TextView text;
        protected Spinner spin;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = null;

        // Check to see if this row has already been painted once.
        if (convertView == null) {

            // If it hasn't, set up everything:
            LayoutInflater inflator = myContext.getLayoutInflater();
            view = inflator.inflate(R.layout.rowview, null);

            // Make a new ViewHolder for this row, and modify its data and spinner:
            final ViewHolder viewHolder = new ViewHolder();
            viewHolder.text = (TextView) view.findViewById(R.id.text);
            viewHolder.data = new DataHolder(myContext);
            viewHolder.spin = (Spinner) view.findViewById(R.id.spin);
            viewHolder.spin.setAdapter(viewHolder.data.getAdapter());

            // Used to handle events when the user changes the Spinner selection:
            viewHolder.spin.setOnItemSelectedListener(new OnItemSelectedListener() {

                @Override
                public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
                    viewHolder.data.setSelected(arg2);
                    viewHolder.text.setText(viewHolder.data.getText());
                }

                @Override
                public void onNothingSelected(AdapterView<?> arg0) {
                }

            });

            // Update the TextView to reflect what's in the Spinner
            viewHolder.text.setText(viewHolder.data.getText());

            view.setTag(viewHolder);

            Log.d("DBGINF", viewHolder.text.getText() + "");
        } else {
            view = convertView;
        }

        // This is what gets called every time the ListView refreshes
        ViewHolder holder = (ViewHolder) view.getTag();
        holder.text.setText(getItem(position).getText());
        holder.spin.setSelection(getItem(position).getSelected());

        return view;
    }
}

这是最终应用程序的屏幕截图(它不是很漂亮,但确实有效):

就是这样!我希望我回答你的问题并帮助其他任何偶然发现它的人.如果要动态地改变在列表中的数据,使用DataAdapter的add(),remove(),get(),和set()方法.要更改每个微调器的数据,需要修改DataHolder类.SpinnerAdapter在那里创建,因此您只需根据数据库响应动态生成适配器.