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>