Android ListView 选中项保持高亮 [英] Android ListView selected item stay highlighted

问题描述

我有一个带有两个 ListView 的 XML，一个带有由选择查询 (lv_cli) 填充的客户端列表，另一个带有所选客户端的详细信息 (lv_cli_det).我想在 lv_cli 中选择客户端，而 lv_cli_det 显示详细信息.

I have an XML with two ListView, one with a list of clients filled by a select query (lv_cli) and the other with the details of the client selected (lv_cli_det). I would like to keep the client selected in the lv_cli while the lv_cli_det show the details.

XML:

<ListView
    android:id="@+id/cli_lista"
    android:layout_width="512dp"
    android:layout_height="wrap_content"
    android:fadeScrollbars="false"
    >
</ListView>

<ListView
    android:id="@+id/cli_lista_det"
    android:layout_width="512dp"
    android:layout_height="wrap_content"
    android:layout_toRightOf="@+id/cli_lista"
    android:fadeScrollbars="false" >
</ListView>

Java:

Cursor cursor = db.rawQuery("Select NrCl||';'||Nome From Clientes", null);
final ListView t = (ListView)findViewById(R.id.cli_lista);
ArrayAdapter<String> myarrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, listItems);
t.setAdapter(myarrayAdapter);

final ListView td = (ListView)findViewById(R.id.cli_lista_detalhe);
final ArrayAdapter<String> myarrayAdapter2 = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, listItems2);

t.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        String item = ((TextView)view).getText().toString();
        String[] strArray = item.split("\;");

        cli.load(strArray[0].toString());
        td.setAdapter(myarrayAdapter2);
        listItems2.clear();
        listItems2.add("Nome: " + cli.getNome());
        listItems2.add("Morada: " + cli.getMorada());
        listItems2.add("Localidade: " + cli.getLoca());
        listItems2.add("Código Postal: " + cli.getCp());
        listItems2.add("Pais: " + cli.getPais());
        listItems2.add("Nif: " + cli.getNif());
        listItems2.add("Tel: " + cli.getTel());
        listItems2.add("Tlm: " + cli.getTlm());
        listItems2.add("Tipo Preço: " + cli.getTipoPvn());
        listItems2.add("Cond. Pagamento: " + cli.getCpg());
        listItems2.add("Obs: " + cli.getObs());
        td.setAdapter(myarrayAdapter2);
        myarrayAdapter2.notifyDataSetChanged(); 
    }
});

推荐答案

要在按下时保持列表视图项的颜色，请在列表视图项布局中包含以下行:

To hold the color of listview item when you press it, include the following line in your listview item layout:

android:background="@drawable/bg_key"

然后像这样在drawable文件夹中定义bg_key.xml:

Then define bg_key.xml in drawable folder like this:

<?xml version="1.0" encoding="utf-8" ?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item 
        android:state_selected="true"
        android:drawable="@color/pressed_color"/>
    <item
        android:drawable="@color/default_color" />
</selector>

最后，将其包含在您的 ListView onClickListener 中:

Finally, include this in your ListView onClickListener:

listView.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,long arg3) {
        view.setSelected(true);
        ... // Anything
    }
});

这样，任何时候都只会选择一项颜色.您可以在 res/values/colors.xml 中定义您的颜色值，如下所示:

This way, only one item will be color-selected at any time. You can define your color values in res/values/colors.xml with something like this:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="pressed_color">#4d90fe</color>
    <color name="default_color">#ffffff</color>
</resources>

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