Android ListView（Selector 背景图片）

浏览数：30 / 时间：2015年06月11日

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);
        }
    }
}