如何在Android中为单个选项列表显示两行文本?

时间:2011-10-06 05:04:48

标签: android android-layout

This is a great tutorial on how to get a Single Choice List in Android工作,但我还需要一件事:我想要两行文本而不是一行。所以,它看起来像这样:

|-----------------------------|
| FIRST LINE OF TEXT      (o) | <- this is a "RadioButton". Ideally, 
| second line of text         |    it would be centered vertically.
|-----------------------------|

This SO question is related,但我是Android新手,所以这有点过头了。任何人都可以为我分解它,以便我可以在上面链接的教程的上下文中使用它吗?

2 个答案:

答案 0 :(得分:1)

您需要为此创建自定义布局。

用于显示列表

这是您的布局文件

<LinearLayout
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent">

   <ListView 
     android:id="@+id/mylistview"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent" />
</LinearLayout>

这是您的自定义列表视图样式

<LinearLayout
     android:orientation="horizontal"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent">
         <LinearLayout
              android:layout_weight="1"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:orientation="vertical">
              <TextView
                     android:id="@+id/text1"
                     android:layout_width="fill_parent"
                     android:layout_height="wrap_content"
                     android:text="Text view 1"/>
              <TextView
                     android:id="@+id/text2"
                     android:layout_width="fill_parent"
                     android:layout_height="wrap_content"
                     android:text="Text view 2"/>
        </LinearLayout>
        <RadioButton android:id="@+id/radiobtn" 
        android:width="wrap_content" android:height="wrap_content" />
</LinearLayout>

现在你必须实现任何适配器,如BaseAdapter,ArrayAdapter等。

并在该

中使用此自定义列表视图 像这样

private class CustomAdapter extends ArrayAdapter<Order> {

        private ArrayList<Model> items;

        public OrderAdapter(Context context, int textViewResourceId, ArrayList<Model> items) {
                super(context, textViewResourceId, items);
                this.items = items;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
                View v = convertView;
                if (v == null) {
                    LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                    v = vi.inflate(R.layout.custom_list, null); // here you have to implement custom_list.xml file
                }
                Model m = items.get(position);
                if (m != null) {
                        TextView text1 = (TextView) v.findViewById(R.id.text1);
                        TextView text2 = (TextView) v.findViewById(R.id.text2);
                        RadioButton rb = (RadioButton) v.findViewById(R.id.radiobtn);
                        text1.setText(m.text1);
                        text1.setText(m.text2);
                        rb.setChecked(m.isChecked);
                }
                return v;
        }
}

这是列表项的Model类

private class Model{
    String text1;
    String text2;
    boolean isChecked;
}

答案 1 :(得分:0)

阅读simple_list_item_single_choice.xml的源代码,我们可以弄清楚如何制作一个实现Checkable的自定义窗口小部件,如下所示:

档案simple_list_item_2_single_choice.xml

<?xml version="1.0" encoding="utf-8"?>
<customwidgets.CheckedLinearLayout 
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:gravity="center"
     android:orientation="horizontal"
     android:paddingBottom="10dp"
     android:paddingTop="10dp" >

    <TextView
        android:id="@+id/text2"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center"
        android:textAppearance="?android:attr/textAppearanceMedium" />
    <CheckedTextView
        android:id="@+id/text3"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:checkMark="?android:attr/listChoiceIndicatorSingle" />
 </customwidgets.CheckedLinearLayout>

也就是说,我们根据需要添加尽可能多的TextView,并将最后一个添加为CheckedTextView

然后,在我们的自定义CheckedLinearLayout中,我们找到哪个是布局的Checkable子项,并将我们实现的Checkable的每个方法分发给该子项,如下所示:

档案CheckedLinearLayout.java

package customwidgets;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.Checkable;
import android.widget.LinearLayout;

/**
 * Useful class inside a ListView that needs to have checkable items,
 * such as radio buttons (single_choice) or check boxes (multiple_choice).
 */
public class CheckedLinearLayout extends LinearLayout implements Checkable {

    private Checkable checkedView;

    public CheckedLinearLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean isChecked() {
        return checkedView == null ? false : checkedView.isChecked();
    }

    @Override
    public void setChecked(boolean checked) {
        if (checkedView != null) checkedView.setChecked(checked);
    }

    @Override
    public void toggle() {
        if (checkedView != null) checkedView.toggle();
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        int count = getChildCount();
        for (int i = count - 1; i >= 0; i--) {
            View view = getChildAt(i);
            if (view instanceof Checkable) {
                checkedView = (Checkable) view;
                break;
            }
        }
    }
}

当然,在所需的布局xml文件中,我们将ListView设置为单一选择:

<ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:choiceMode="singleChoice" >
</ListView>