在Android开发中ListView控件经常用到，下面这个示例可以手动输入数据，在ListView控件上增加一个Item，同时在每一个Item上有一个删除按钮可以删除该条目，界面如下。

（1）工程目录结构

ListViewAdapter.Java 是ListView的适配类

StudentBean.java 是ListView Item的数据

MainActivity.java是启动类

CommonConstant.java 是常量

activity_main.xml是主的布局文件

add_user.xml是界面上添加学生姓名、描述信息和Save按钮的布局文件

title_tool.xml是自定义的标题布局文件

student_listview.xml是ListView每一个Item的布局文件

（2）布局文件

这几个布局文件都采用LinearLayout布局，代码如下 active_main.xml [html] view plain copy

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.nii.orcale.MainActivity">
<include layout="@layout/title_toolbar"></include>
<include layout="@layout/add_user"></include>
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>

title_toolbar.xml [html] view plain copy

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout_titlebar"
android:layout_width="match_parent"
android:layout_height="52dp"
android:background="#ed4255">
<TextView
android:id="@+id/text_title"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:ellipsize="marquee"
android:gravity="center_horizontal|center"
android:singleLine="true"
android:text="@string/title"
android:textColor="#ffffffff"
android:textSize="20dp"/>
</RelativeLayout>

add_user.xml [html] view plain copy

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.nii.orcale.MainActivity">
<include layout="@layout/title_toolbar"></include>
<include layout="@layout/add_user"></include>
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>

student_listview.xml [html] view plain copy

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="5dp"
android:paddingTop="5dp">
<ImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:id="@+id/stuIcon"
android:layout_gravity="center"
android:src="@mipmap/stu1"
/>
<LinearLayout
android:layout_gravity="center"
android:orientation="vertical"
android:paddingLeft="15dp"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:singleLine="true"
android:id="@+id/showStuName"
android:text="showStuName"
android:textColor="#000000"
android:textSize="16sp"
android:layout_marginBottom="3dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<TextView
android:singleLine="true"
android:id="@+id/showStuDesc"
android:text="stuDesc"
android:textColor="#000000"
android:textSize="16sp"
android:layout_marginBottom="3dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_weight="0"
android:layout_height="wrap_content">
<Button
android:layout_gravity="center"
android:text="Delete"
android:id="@+id/showDeleteButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>

AndroidManifest.xml文件[html] view plain copy

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.nii.orcale" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" >
<activity android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

3、代码逻辑实现.

ListView的适配器采用BaseAdapter，界面上的数据放入List中。 private List<StudentBean> studentBeanList = new ArrayList<StudentBean>();

notifyDataSetChanged

当点击Save按钮的时候，把界面上输入的姓名和描述信息放入添加到studentBeanList 中，同时出发Adapter的notifyDataSetChanged事件，重新加载界面数据。在点击每一个Item的Delete按钮时候，把studentBeanList 中数据移除，同时也发出Adapter的notifyDataSetChanged事件，重新加载界面数据。
代码如下： MainActivity.java
[java] view plain copy

package com.nii.orcale;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import com.nii.orcale.adapter.ListViewAdapter;
import com.nii.orcale.bean.StudentBean;
import org.apache.commons.lang3.StringUtils;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity
{
/**
* Context
*/
private Context mContext;
/**
* listview
*/
private ListView listView;
/**
* 适配器
*/
private ListViewAdapter listViewAdapter;
/**
* 保存数据
*/
private List<StudentBean> studentBeanList = new ArrayList<StudentBean>();
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.mContext = this;
//加载listview
listView = (ListView) findViewById(R.id.listView);
listViewAdapter = new ListViewAdapter(mContext,studentBeanList);
listView.setAdapter(listViewAdapter);
//save button的点击事件
Button saveButton = (Button) findViewById(R.id.saveButton);
saveButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
saveStudentMessage();
}
});
}
/**
* 保存学生的信息
*/
private void saveStudentMessage()
{
EditText nameEditText = (EditText) findViewById(R.id.nameEditText);
EditText descEditText = (EditText) findViewById(R.id.descEditText);
if (StringUtils.isEmpty(nameEditText.getText().toString())
|| StringUtils.isEmpty(descEditText.getText().toString()))
{
Toast.makeText(mContext,"姓名和描述信息都不能为空",Toast.LENGTH_SHORT).show();
return;
}
//判断该学生是否存在
for (StudentBean studentBean : studentBeanList)
{
if (StringUtils.equals(studentBean.getName(),nameEditText.getText().toString()))
{
Toast.makeText(mContext,nameEditText.getText().toString() + "已经存在",Toast.LENGTH_SHORT).show();
return;
}
}
StudentBean studentBean = new StudentBean(nameEditText.getText().toString(),descEditText.getText().toString());
studentBeanList.add(studentBean);
listViewAdapter.notifyDataSetChanged();
}
}

适配器ListViewAdapter.java [java] view plain copy

package com.nii.orcale.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import com.nii.orcale.R;
import com.nii.orcale.bean.StudentBean;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Created by wzj on 2017/2/11.
*/
public class ListViewAdapter extends BaseAdapter
{
/**
* Context
*/
private Context mContext;
/**
* 数据
*/
private List<StudentBean> studentBeanList;
/**
* 构造函数
* @param context context
* @param studentBeanList studentBeanMap
*/
public ListViewAdapter(Context context,List<StudentBean> studentBeanList)
{
this.mContext = context;
this.studentBeanList = studentBeanList;
}
/**
* How many items are in the data set represented by this Adapter.
*
* @return Count of items.
*/
@Override
public int getCount()
{
return studentBeanList.size();
}
/**
* Get the data item associated with the specified position in the data set.
*
* @param position Position of the item whose data we want within the adapter's
* data set.
* @return The data at the specified position.
*/
@Override
public Object getItem(int position)
{
return null;
}
/**
* Get the row id associated with the specified position in the list.
*
* @param position The position of the item within the adapter's data set whose row id we want.
* @return The id of the item at the specified position.
*/
@Override
public long getItemId(int position)
{
return 0;
}
/**
* Get a View that displays the data at the specified position in the data set. You can either
* create a View manually or inflate it from an XML layout file. When the View is inflated, the
* parent View (GridView, ListView...) will apply default layout parameters unless you use
* {@link LayoutInflater#inflate(int, ViewGroup, boolean)}
* to specify a root view and to prevent attachment to the root.
*
* @param position The position of the item within the adapter's data set of the item whose view
* we want.
* @param convertView The old view to reuse, if possible. Note: You should check that this view
* is non-null and of an appropriate type before using. If it is not possible to convert
* this view to display the correct data, this method can create a new view.
* Heterogeneous lists can specify their number of view types, so that this View is
* always of the right type (see {@link #getViewTypeCount()} and
* {@link #getItemViewType(int)}).
* @param parent The parent that this view will eventually be attached to
* @return A View corresponding to the data at the specified position.
*/
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
View view = null;
if (convertView != null)
{
view = convertView;
}
else
{
view = View.inflate(mContext, R.layout.student_listview, null);
}
StudentBean studentBean = studentBeanList.get(position);
if (studentBean == null)
{
studentBean = new StudentBean("NoName","NoDesc");
}
//更新数据
final TextView nameTextView = (TextView) view.findViewById(R.id.showStuName);
nameTextView.setText(studentBean.getName());
TextView descTextView = (TextView)view.findViewById(R.id.showStuDesc);
descTextView.setText(studentBean.getDesc());
final int removePosition = position;
//删除按钮点击事件
Button deleteButton = (Button)view.findViewById(R.id.showDeleteButton);
deleteButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
deleteButtonAction(removePosition);
}
});
return view;
}
private void deleteButtonAction(int position)
{
studentBeanList.remove(position);
notifyDataSetChanged();
}
}

数据对象StuentBean.java [java] view plain copy

package com.nii.orcale.bean;
/**
* Created by wzj on 2017/2/12.
*/
public class StudentBean
{
private int id;
private String name;
private int score;
private String desc;
public StudentBean()
{
}
public StudentBean(String name, String desc)
{
this.name = name;
this.desc = desc;
}
public int getId()
{
return id;
}
public void setId(int id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public int getScore()
{
return score;
}
public void setScore(int score)
{
this.score = score;
}
public String getDesc()
{
return desc;
}
public void setDesc(String desc)
{
this.desc = desc;
}
}

注意：

1、需要在给ListView每一个Item上都要添加事件。

代码github链接： https://github.com/HelloKittyNII/ModuleCode/tree/master/android/03.listview

秒客网

Android对ListView控件增删改查

（1）工程目录结构

（2）布局文件

3、代码逻辑实现.

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