Android的列表视图与微调和一个复选框 [英] Android Listview with spinner and a checkbox
问题描述
我是一个新手，Android的发展。我想创建一个列表里面有一个微调，一个编辑文本和一个复选框。对于微调的数据和复选框来自数据的基础上。我有以下的文件。
I am a newbie to android development. I am trying to create a List which has a spinner, a edit text and a check box. The data for spinner and check box come from data base. I have the following files.
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
The list view 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"
/>
问题
我得到多个纺纱，复选框和的EditText根据数据库中的字段数。我看到，我们不能设置适配器的复选框，因为我设置了微调。
我得只有一个微调有一个编辑的文本和多个复选框（数据库行总数）。请大家帮忙！
Problem
I get multiple spinners, checkboxes and edittext based on the number of fields in the database. I see that we cannot set the adapter for the checkbox as i set for the spinner.
I need to get only one spinner with one edit text and multiple checkboxes(total number of database rows). please help!
推荐答案
编辑 - 请评论，这种解决方案可能不正确
我知道这个问题古老，但它是谷歌的第一个结果，我正在使用纱厂在ListView以及应用程序。我用一些样本code从这里上手。我希望这个例子回答你的问题。我没有实现的复选框，但他们是非常相似的微调 - 更加容易，其实。这个例子与一个TextView和微调一个ListView。每当用户更改微调选择，TextView的变化来反映这一点。
I know this question ancient, but it is the first result on Google and I am working on an application that uses Spinners in a ListView as well. I used some sample code from here to get started. I hope this example answers your question. I didn't implement the CheckBoxes but they're very similar to the Spinner - much easier, in fact. This example has a ListView with a TextView and a Spinner. Whenever the user changes a selection in the spinner, the TextView changes to reflect this.
我分这个项目分成3类：
I divided this project up into 3 classes:
- ListViewTestActivity - 主要活动
- DataAdapter的 - 扩展ArrayAdapter和作品，以显示元素在ListView
- 在DataHolder - 简单的对象，只是包含有关元素的一些信息。这可以通过许多其他方式来满足您的需求来实现。
也有3个关键的Android XML文件，我修改/创建：
There are also 3 key Android XML files I modified / created:
- 在main.xml中 - 修改 - 主要布局
- rowview.xml - 添加 - 为在ListView 每个元素的布局
- 的strings.xml - 修改 - 默认的Android字符串文件
- main.xml - modified - the main layout
- rowview.xml - added - the layout for each element in the ListView
- strings.xml - modified - the default Android strings file
要由下向上开始，这个main.xml中的文件只包含一个ListView的，而不是其他：
To start from the bottom up, this main.xml file only contains a single ListView, and nothing else:
<?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>
这里是rowview.xml。请记住，这个观点被复制的每一行中的ListView：
And here is the rowview.xml. Remember that this view is duplicated for each row in the ListView:
<?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>
在strings.xml中的文件。我所添加的是一个数组微调的内容：
The strings.xml file. All I added was an array for the contents of the spinner:
<?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>
现在的有趣的东西。该ListViewActivity类：
Now for the fun stuff. The ListViewActivity class:
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);
}
}
这是pretty的简单，你只拿到名单，使一个新的适配器，ListView的适配器设置为你做一个。这是DataHolder类：
It's pretty simple, you just get the list, make a new adapter, and set the ListView's adapter to the one you made. This is the DataHolder class:
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类的作用是保持微调的适配器和其他任何你可能要存储在ListView中的每个条目的信息（你可能要存储是否被选中与否，例如）。最后是应用程序的真正的肉，该DataAdapter类：
All the DataHolder class does is hold the Spinner's adapter and whatever other information you might want to store for each entry in the ListView (you may want to store whether it is checked or not, for example). And finally the real "meat" of the app, the DataAdapter class:
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;
}
}
下面是最终的应用程序的截图（这不是很pretty的，但它的工作）：
Here's a screenshot of the final app (it's not very pretty, but it does work):
这就是它！我希望我回答你的问题，并帮助其他人谁偶然发现了它像我一样。如果要动态地更改列表中的数据，使用DataAdapter的添加（），删除（），获得（）和设置（）的方法。 要更改每个微调的数据，您需要修改DataHolder类。该SpinnerAdapter创建在那里，所以你只需要动态地生成依赖于数据库的响应适配器。
And that's it! I hope I answered your question and helped anyone else who stumbled upon it like I did. If you want to dynamically change the data in the list, use the DataAdapter's add(), remove(), get(), and set() methods. To change the data for each individual spinner, you need to modify the DataHolder class. The SpinnerAdapter is created there, so you just need to dynamically generate the adapters depending on the database response.
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