如何更改列表视图中选定项目的颜色？

Question

我需要在单击ListView时更改选定项目的颜色，以便用户知道单击了什么。

到目前为止，我已经为此编写了以下代码：

listview.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
    for (int a = 0; a< parent.getChildCount();a++){
    parent.getChildAt(a).setBackgroundColor(Color.TRANSPARENT);
    view.refreshDrawableState();
     if(parent.getChildAt(a) == view){
         view.setBackgroundColor(getResources().getColor(R.color.soft_opaque));
         view.refreshDrawableState();
    }
}

它所做的是更改所选项目的背景色，并保持原样，直到我单击另一个项目，使其仅更改当前项目所选的背景色

我还想知道是否有一种XML方法可以做到这一点。到目前为止，我发现：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@color/orange" /> <!-- pressed -->
    <item android:state_focused="true" android:drawable="@color/black" /> <!-- focused -->
    <item android:state_selected="true" android:state_pressed="true" android:drawable="@color/black" /> <!-- focused and pressed-->
    <item android:drawable="@color/black" /> <!-- default -->
</selector> 

但我还没有得到之前代码的功能。不过，它所做的是更改背景颜色，并在单击时更改背景颜色，但不使用特定的颜色保留选定的项目

编辑：我的适配器

    public class ExtraAdapter extends ArrayAdapter<String> {
    Context context;
    String[] tittleArray;

    public ExtraAdapter(Context c, String[] titles) {
        super(c, R.layout.custom_listview_extra, titles);
        this.context = c;
        this.tittleArray = titles;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        if (row == null) {
            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = inflater.inflate(R.layout.custom_listview_extra, parent,
                    false);
        }
        TextView myTitle = (TextView) row.findViewById(R.id.plato_extra);
        myTitle.setText(tittleArray[position]);

        return row;
    }

}

我的活动

    public class ExtraMenu extends ActionBarActivity {
    ListView lcategory;
    ListView lextras;
    ExtraAdapter adapter;
    String[] categoria;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_extra_test);
        lcategory = (ListView) findViewById(R.id.categorias);
        String[] listaExtras = getResources().getStringArray(R.array.listaExtras);
        adapter = new ExtraAdapter(getApplicationContext(), listaExtras);
        lcategory.setAdapter(adapter);

        lcategory.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                parent.setSelected(true);
                /*
                for (int a = 0; a< parent.getChildCount();a++){
                    parent.getChildAt(a).setBackgroundColor(Color.TRANSPARENT);
                    view.refreshDrawableState();
                    if(parent.getChildAt(a) == view){
                        view.setBackgroundColor(getResources().getColor(R.color.soft_opaque));
                        view.refreshDrawableState();
                    }
                }*/
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getMenuInflater().inflate(R.menu.extra_test, menu);
        return true;
    }
    }

我的活动XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:weightSum="2" >

    <ImageView
        android:id="@+id/logo"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_weight="1.5"
        android:src="@drawable/logo" />

    <ListView
        android:id="@+id/categorias"
        android:layout_weight="0.5"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        //android:background="@drawable/list_color"
        android:layout_marginTop="20dp">
    </ListView>

</LinearLayout>

我的适配器XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    style="@style/Widget.AppCompat.ListView.Menu"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:paddingTop="10dip"
    android:paddingBottom="10dip">

    <TextView
        android:id="@+id/plato_extra"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="20dp"
        //android:background="@drawable/list_color"
        android:textColor="#000000"
        android:textSize="25sp" />

</RelativeLayout>

Answer 1

使用

listView.setOnItemSelectedListener(new OnItemSelectedListener() {

                @Override
                public void onItemSelected(AdapterView<?> arg0, View arg1,
                        int arg2, long arg3) {
                    // TODO Auto-generated method stub
                    arg0.setSelected(true);
                }

                @Override
                public void onNothingSelected(AdapterView<?> arg0) {
                    // TODO Auto-generated method stub

                }
            });

在你的选择器Drawable中

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@color/green" /> <!-- pressed -->
    <item android:state_focused="true" android:drawable="@color/black" /> <!-- focused -->
    <item android:state_selected="true"  android:drawable="@color/black" /> <!-- selected-->
    <item android:drawable="@color/black" /> <!-- default -->
</selector> 

我还没有测试它，但肯定这将工作。

Answer 2

按你写选择器的方式，当你按下该行时，就会变成黑色。这是因为按下的视图也是聚焦的，并且第一个匹配被按下并聚焦。更改顺序，放弃onItemClick的实现

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@color/green" /> <!-- pressed -->
    <item android:state_focused="true" android:drawable="@color/black" /> <!-- focused -->
    <item android:state_focused="true" android:state_pressed="true" android:drawable="@color/black" /> <!-- focused and pressed-->
    <item android:drawable="@color/black" /> <!-- default -->
</selector>