Android应用开发之多选删除之一

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        今天我们学习一下如何利用CheckBox实现对联系人记录的多选删除，多选删除功能在平时工作中经常会遇到，通常有两种解决方案：CheckBox实现和ActonBar实现。本人偏爱CheckBox样式的多选模式，因为它实现起来比较灵活多变，样式变换也很容易。而ActionBar的多选样式变换相对而言工作量会大很多。

1案例技术要点（待整理）

2案例代码陈列

工程包目录

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.lynn.multisel"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.WRITE_CONTACTS" />
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".MultiSelectDeleteActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

strings.xml

<resources>

    <string name="app_name">CheckBox实现多选删除联系人</string>
    <string name="delete">删除</string>
    <string name="cancel">取消</string>
    <string name="select_all_text">全选</string>
    <string name="clearConfirmation_title">删除</string>
    <string name="clearConfirmation">加入的联系人将被删除</string>
    <string name="clearProgress_title">正在删除…</string>

</resources>

styles.xml

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

    <style name="CheckBoxTheme" parent="@android:style/Widget.CompoundButton.CheckBox">
        <item name="android:button">@drawable/checkbox_selector</item>
    </style>

    <style name="ButtonBarTheme" parent="@android:style/ButtonBar">
        <item name="android:background">#006699</item>
    </style>
</resources>

main.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" >

    <include
        android:id="@+id/select_all"
        layout="@layout/select_all" />

    <ListView
        android:id="@+id/del_list"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="#ffffff"
        android:cacheColorHint="#00000000"
        android:listSelector="#00000000" />

    <LinearLayout
        style="@style/ButtonBarTheme"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <Button
            android:id="@+id/del_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:enabled="false"
            android:text="@string/delete" />

        <Button
            android:id="@+id/can_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/cancel" />
    </LinearLayout>

</LinearLayout>

list_item.xm

<?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="wrap_content"
    android:layout_centerVertical="true"
    android:descendantFocusability="blocksDescendants"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    android:background="#66ccff" >
    
    <CheckBox
        android:id="@+id/select_chk"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:clickable="false"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:visibility="visible"
        style="@style/CheckBoxTheme"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="10dp" />

    <TextView
        android:id="@+id/name_txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@id/select_chk"
        android:layout_marginRight="230dp"
        android:layout_centerVertical="true"
        android:singleLine="true"
        android:textSize="18sp"
        android:textColor="#ffffff" />

</RelativeLayout>

select_all.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="wrap_content"
    android:gravity="center_vertical"
    android:background="#006699" >

    <CheckBox
        android:id="@+id/select_all_chk"
        style="@style/CheckBoxTheme"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp" />
    
    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:layout_weight="1"
        android:text="@string/select_all_text"
        android:textColor="@android:color/white"
        android:textSize="20sp" />

</LinearLayout>

checkbox_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/checkbox_pressed" android:state_checked="true"/>
    <item android:drawable="@drawable/checkbox_normal" android:state_checked="false"/>
    <item android:drawable="@drawable/checkbox_normal"/>

</selector>