列表视图突出显示选定的行

Question

选择项目后，我需要在列表视图中突出显示所选行。

例如：我选择第一个项目，它会突出显示，如果我选择第三个项目，然后删除第一个突出显示的项目，然后突出显示第三个项目。

我在 Stackoverflow 上看到过很多示例和问题，但还没有找到合适的解决方案。

下面是我的代码，它可以工作，但我需要选择两次才能突出显示，我该如何修改它才能顺利工作？

ListView mainListView = (ListView) findViewById( R.id.mainListView );  

        // Create and populate a List of planet names.  
        planets = new String[] { "Mercury", "Venus", "Earth", "Mars",  
                                          "Jupiter", "Saturn", "Uranus", "Neptune",
                                          "Ceres","Pluto","Haumea","Makemake","Eris"};    
        planetList = new ArrayList<String>();  
        planetList.addAll( Arrays.asList(planets) );  

        planetsAdapter = new PlanetsAdapter (this,planetList);
        planetsAdapter .setNotifyOnChange(true);

        // Set the ArrayAdapter as the ListView's adapter.  
        mainListView.setAdapter(planetsAdapter );
        mainListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        mainListView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                planetsAdapter.setSelectedPosition(position);
                planetsAdapter.notifyDataSetChanged();
            }
        });

改编类：

public class PlanetsAdapter extends ArrayAdapter<String> {
        private ArrayList<String> planets;
        private Context mContext = null;
        private LayoutInflater inflater;

        // used to keep selected position in ListView
        private int selectedPos = -1;   // init value for not-selected

        public PlanetsAdapter (Context context,ArrayList<String> objects) {
            super(context,0,objects);
            mContext = context;
            planets = objects;
        }

        public void setSelectedPosition(int pos){
            selectedPos = pos;
            // inform the view of this change
        }

        public int getSelectedPosition(){
            return selectedPos;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                inflater = (LayoutInflater) mContext
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = inflater.inflate(R.layout.list_item, null);
            }

            TextView title = (TextView) convertView
                    .findViewById(R.id.rowTextView);

            // change the row color based on selected state
            if(position == selectedPos){
                //title.setTextColor(Color.parseColor("#FFFFFF"));
                title.setBackgroundColor(Color.parseColor("#ED07E1"));
            }else{
                //title.setTextColor(Color.parseColor("#000000"));
                title.setBackgroundColor(Color.parseColor("#e2e2e2"));
            }

            title.setText(getItem(position));
            return convertView;
        }
    }

编辑：在下面回答

For anyone who is looking for answers, i have answered it below hope it helps.

Answer 1

将此设置到您的列表视图中（xml 或代码）

XML: android:choiceMode="singleChoice"

code: mListView.setChoiceMode(AbsListView.CHOICE_MODE_SINGLE);

在您的 xml 中，尝试添加 android:listSelector 背景，以便对您的选择进行反馈。

参考：http://developer.android.com/reference/android/widget/AbsListView.html

Answer 2

经过大量的研究和研发终于得到了解决方案：

Activity 或 Fragment 中的列表视图：

ListView mainListView = (ListView) findViewById( R.id.mainListView );  

        // Create and populate a List of planet names.  
        planets = new String[] { "Mercury", "Venus", "Earth", "Mars",  
                                          "Jupiter", "Saturn", "Uranus", "Neptune",
                                          "Ceres","Pluto","Haumea","Makemake","Eris"};    
        planetList = new ArrayList<String>();  
        planetList.addAll( Arrays.asList(planets) );  

        planetsAdapter = new PlanetsAdapter (this,planetList);
        planetsAdapter .setNotifyOnChange(true);

        // Set the ArrayAdapter as the ListView's adapter.  
        mainListView.setAdapter(planetsAdapter );
        mainListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        mainListView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                view.setSelected(true); //Important
            }
        });

适配器类：

public class PlanetsAdapter extends ArrayAdapter<String> {
        private ArrayList<String> planets;
        private Context mContext = null;
        private LayoutInflater inflater;


        public PlanetsAdapter (Context context,ArrayList<String> objects) {
            super(context,0,objects);
            mContext = context;
            planets = objects;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                inflater = (LayoutInflater) mContext
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = inflater.inflate(R.layout.list_item, null);
            }

            TextView title = (TextView) convertView
                    .findViewById(R.id.rowTextView);

            title.setText(getItem(position));//Set the text to textview
            return convertView;
        }
    }

在 XML 中定义的 ListView：

<ListView
                    android:id="@+id/mainListView"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:background="#FFFFFF"
                    android:choiceMode="singleChoice"
                    android:cacheColorHint="#00000000">
                </ListView>

xml中定义的每个列表项list_item.xml:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"  
 android:id="@+id/rowTextView"   
 android:layout_width="fill_parent"   
 android:layout_height="fill_parent"  
 android:padding="5dp"  
 android:background="@drawable/list_item_selector"
 android:textColor="@drawable/text_color_selector"
 android:textSize="16sp" >  
</TextView>

请注意，在上面的代码中，我使用了 2 个不同的选择器，一个用于背景，一个用于更改文本颜色。

list_item_selector.xml：

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@color/defalut_color" android:state_activated="false"/>
    <item android:drawable="@color/defalut_color" android:state_activated="false" android:state_pressed="false"/>
    <item android:drawable="@color/pressed_color" android:state_pressed="true"/>
    <item android:drawable="@color/pressed_color" android:state_activated="true"/>

</selector>

文本颜色选择器：

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:color="#000000" android:state_activated="false"/>
    <item android:color="#000000" android:state_activated="false" android:state_pressed="false"/>
    <item android:color="#FFFFFF" android:state_pressed="true"/>
    <item android:color="#FFFFFF" android:state_activated="true"/>

</selector>

res/values/colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="defalut_color">#e2e2e2</color>
<color name="pressed_color">#ED07E1</color>
</resources>

这就是它的享受:)