Android ListView（Selector 背景图片）

listview0.xml

<?xml version="1.0" encoding="utf-8"?>

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <RadioGroup

        android:id="@+id/myRadioGroup"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal" >

        <RadioButton

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="无" />

        <RadioButton

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="单选模式" />

        <RadioButton

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="多选模式" />

    </RadioGroup>

    <ListView

        android:id="@+id/mylistview"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:background="@android:color/white"

        android:divider="@android:color/darker_gray"

        android:dividerHeight="1dp"

        android:fadingEdge="none"

        android:scrollingCache="false" >

    </ListView>

</LinearLayout>

list_item_0.xml

<?xml version="1.0" encoding="utf-8"?>

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:descendantFocusability="blocksDescendants" >

    <ImageView

        android:id="@+id/img"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_centerVertical="true"

        android:layout_margin="5dp" />

    <LinearLayout

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerVertical="true"

        android:layout_toRightOf="@id/img"

        android:orientation="vertical" >

        <TextView

            android:id="@+id/title"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:textColor="#ffffff"

            android:textSize="22sp" />

        <TextView

            android:id="@+id/info"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:textColor="#ffffff"

            android:textSize="13sp" />

    </LinearLayout>

</RelativeLayout>

list_item_bg_selector.xml

<?xml version="1.0" encoding="utf-8"?>

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

    <item android:drawable="@drawable/child_list_select_item" android:state_pressed="true"/>

    <item android:drawable="@drawable/child_list_bg_1" android:state_activated="true"/>

    <item android:drawable="@drawable/child_list_item"/>

</selector>

使用了 android:state_activated属性，API至少是11，否则部分效果无法显示，本人机器就是那样！

My0Adapter.java

package com.wangzhu.demoselector;

import java.util.List;

import java.util.Map;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.webkit.WebView.FindListener;

import android.widget.BaseAdapter;

import android.widget.CheckBox;

import android.widget.ImageView;

import android.widget.TextView;

public class My0Adapter extends BaseAdapter {

    private Context context;

    private LayoutInflater inflater;

    private List<Map<String, Object>> items;

    public My0Adapter(Context context, List<Map<String, Object>> items) {

        this.context = context;

        this.items = items;

        init();

    }

    private void init() {

        inflater = LayoutInflater.from(context);

    }

    @Override

    public int getCount() {

        return items.size();

    }

    @Override

    public Object getItem(int position) {

        return items.get(position);

    }

    @Override

    public long getItemId(int position) {

        return position;

    }

    @Override

    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder viewHolder = null;

        if (null == convertView) {

            convertView = inflater.inflate(R.layout.list_item_0, null);

            viewHolder = new ViewHolder();

            viewHolder.img = (ImageView) convertView.findViewById(R.id.img);

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

            viewHolder.info = (TextView) convertView.findViewById(R.id.info);

            convertView.setTag(viewHolder);

        } else {

            viewHolder = (ViewHolder) convertView.getTag();

        }

        viewHolder.img.setBackgroundResource(Integer.parseInt(String

                .valueOf(items.get(position).get("img"))));

        viewHolder.title.setText(String.valueOf(items.get(position)

                .get("title")));

        viewHolder.info

                .setText(String.valueOf(items.get(position).get("info")));

        convertView.setBackgroundResource(R.drawable.list_item_bg_selector);

        return convertView;

    }

}

ViewHolder.java

package com.wangzhu.demoselector;

import android.widget.CheckBox;

import android.widget.ImageView;

import android.widget.TextView;

public final class ViewHolder {

    public ImageView img;

    public TextView title;

    public TextView info;

    public CheckBox checkBox;

}

ListView0Activity.java

package com.wangzhu.demoselector;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.os.Bundle;

import android.widget.ListView;

import android.widget.RadioGroup;

public class ListView0Activity extends Activity {

    private final static String TAG = "ListView0Activity";

    private My0Adapter adapter;

    private ListView listView;

    private RadioGroup myRadioGroup;

    private List<Map<String, Object>> datas;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.listview0);

        init();

    }

    private void init() {

        getDatas();

        adapter = new My0Adapter(this, datas);

        listView = (ListView) findViewById(R.id.mylistview);

        listView.setAdapter(adapter);

        myRadioGroup = (RadioGroup) findViewById(R.id.myRadioGroup);

        myRadioGroup

                .setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

                    @Override

                    public void onCheckedChanged(RadioGroup group, int checkedId) {

                        switch (checkedId) {

                        case 1:

                            listView.setChoiceMode(ListView.CHOICE_MODE_NONE);

                            break;

                        case 2:

                            listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

                            break;

                        case 3:

                            listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

                            break;

                        default:

                            break;

                        }

                        // 自定义的BaseAdapter中调用notifyDataSetChanged方法会重新调用BaseAdapter的getView方法

                        adapter.notifyDataSetChanged();

                    }

                });

        myRadioGroup.check(1);

    }

    public void getDatas() {

        datas = new ArrayList<Map<String, Object>>();

        Map<String, Object> map = null;

        for (int i = 0; i < 20; i++) {

            map = new HashMap<String, Object>();

            map.put("title", "G" + i);

            map.put("info", "Google " + i);

            map.put("img", R.drawable.ic_launcher);

            datas.add(map);

        }

    }

}

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Android ListView（Selector 背景图片）

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