【Android】Android软件开发之ListView 详解

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ListView的使用方法 

ListView是Android软件开发中非常重要组件之一，基本上是个软件基本都会使用ListView ，今天我通过一个demo来教大家怎么样使用ListView组件 绘制出漂亮的列表，说道ListView就不得不说Adapter适配器，因为只有通过Adapter才可以把列表中的数据映射到ListView中。
在android的开发中最Adapter 一共可以分为
ArrayAdapter<T>,
BaseAdapter, 
CursorAdapter,
HeaderViewListAdapter, 
ResourceCursorAdapter,
SimpleAdapter,
SimpleCursorAdapter,
WrapperListAdapter
软件开发中最常用的有ArrayAdapter<T>, BaseAdapter, SimpleAdapter，今天我用一段代码向大家诠释如何使用ListView控件。
 

1.简单的ListView

在List列表中如果不存在过于复杂的东西 我们可以直接去new ArrayAdapter() 来绘制列表，无须继承ArrayAdapter，重写它的方法。但是如果列表中过于复杂的话就需要使用自定义布局来实现List列表。

public class SimpleList extends ListActivity {  

    private String[] mListStr = {"姓名：雨松MOMO","性别：男","年龄：25","居住地：北京","邮箱：xuanyusong@gmail.com"};  

    ListView mListView = null;  

    @Override  

    protected void onCreate(Bundle savedInstanceState) {  

    mListView = getListView();  

    setListAdapter(new ArrayAdapter<String>(this,  

                android.R.layout.simple_list_item_1, mListStr));  

    mListView.setOnItemClickListener(new OnItemClickListener() {  

        @Override  

        public void onItemClick(AdapterView<?> adapterView, View view, int position,  

            long id) {  

        Toast.makeText(SimpleList.this,"您选择了" + mListStr[position], Toast.LENGTH_LONG).show();  

        }  

    });  

 

    super.onCreate(savedInstanceState);  

    }  

} 

　　

2.带标题的ListView列表

使用 simpleAdapter 需要注意的是须要用Map<String,Object> item 来保存列表中每一项的显示的title与text , new SimpleAdapter的时候将map中的数据写入 ，程序就会帮我们绘制列表了。

public class TitleList extends ListActivity {  

    private String[] mListTitle = { "姓名", "性别", "年龄", "居住地","邮箱"};  

    private String[] mListStr = { "雨松MOMO", "男", "25", "北京",  

        "xuanyusong@gmail.com" };  

    ListView mListView = null;  

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

 

    @Override  

    protected void onCreate(Bundle savedInstanceState) {  

    mListView = getListView();  

        

    int lengh = mListTitle.length;  

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

        Map<String,Object> item = new HashMap<String,Object>();  

        item.put("title", mListTitle[i]);  

        item.put("text", mListStr[i]);  

        mData.add(item);   

    }  

    SimpleAdapter adapter = new SimpleAdapter(this,mData,android.R.layout.simple_list_item_2,  

        new String[]{"title","text"},new int[]{android.R.id.text1,android.R.id.text2});  

        setListAdapter(adapter);  

    mListView.setOnItemClickListener(new OnItemClickListener() {  

        @Override  

        public void onItemClick(AdapterView<?> adapterView, View view, int position,  

            long id) {  

        Toast.makeText(TitleList.this,"您选择了标题：" + mListTitle[position] + "内容："+mListStr[position], Toast.LENGTH_LONG).show();  

        }  

    });  

    super.onCreate(savedInstanceState);  

    }  

} 

 

 

 

3.带图片的ListView列表

使用 simpleAdapter 来操作 但是构造simpleAdapter的时候须要使用我们自己写的布局来完成 ，因为系统的布局已经不能满足需求了，同样Map<String,Object> item 来保存列表中每一项须要的显示内容 如 图片 标题 内容等。
 

添加我们自己的列表布局 图片 标题 内容 
 

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

 

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

    android:layout_width="fill_parent" android:layout_height="?android:attr/listPreferredItemHeight"> 

    <ImageView android:id="@+id/image" 

        android:layout_width="wrap_content" android:layout_height="fill_parent" 

        android:layout_alignParentTop="true" android:layout_alignParentBottom="true" 

        android:adjustViewBounds="true" 

        android:padding="2dip" /> 

    <TextView android:id="@+id/title" 

        android:layout_width="wrap_content" android:layout_height="wrap_content" 

        android:layout_toRightOf="@+id/image" 

        android:layout_alignParentRight="true" android:layout_alignParentTop="true" 

        android:layout_above="@+id/text" 

        android:layout_alignWithParentIfMissing="true" android:gravity="center_vertical" 

        android:textSize="15dip" /> 

    <TextView android:id="@+id/text" 

        android:layout_width="fill_parent" android:layout_height="wrap_content" 

        android:layout_toRightOf="@+id/image" 

        android:layout_alignParentBottom="true" 

        android:layout_alignParentRight="true" android:singleLine="true" 

        android:ellipsize="marquee"   

        android:textSize="20dip" /> 

</RelativeLayout> 

 

 

public class IconList extends ListActivity {  

    private String[] mListTitle = { "姓名", "性别", "年龄", "居住地","邮箱"};  

    private String[] mListStr = { "雨松MOMO", "男", "25", "北京",  

        "xuanyusong@gmail.com" };  

    ListView mListView = null;  

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

 

    @Override  

    protected void onCreate(Bundle savedInstanceState) {  

    mListView = getListView();  

        

    int lengh = mListTitle.length;  

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

        Map<String,Object> item = new HashMap<String,Object>();  

        item.put("image", R.drawable.jay);  

        item.put("title", mListTitle[i]);  

        item.put("text", mListStr[i]);  

        mData.add(item);   

    }  

    SimpleAdapter adapter = new SimpleAdapter(this,mData,R.layout.iconlist,  

        new String[]{"image","title","text"},new int[]{R.id.image,R.id.title,R.id.text});  

        setListAdapter(adapter);  

    mListView.setOnItemClickListener(new OnItemClickListener() {  

        @Override  

        public void onItemClick(AdapterView<?> adapterView, View view, int position,  

            long id) {  

        Toast.makeText(IconList.this,"您选择了标题：" + mListTitle[position] + "内容："+mListStr[position], Toast.LENGTH_LONG).show();  

        }  

    });  

    super.onCreate(savedInstanceState);  

    }  

} 

 

4.自定义布局BaseAdapter修改列表颜色

因为通过直接 构造系统的布局来绘制列表方法肯定是有限的，所以我们需要重写绘制方法 ，写一个类去继承BaseAdapter 并实现这个类中的方法，listView在一开始绘制的时候首先会调用getCout()方法得到绘制次数 ，然后会实例化自己定义的BaseAdapter通过getView()方法一层一层绘制ListView,所以我们可以在这里面根据position(当前绘制的ID)来任意的修改绘制的内容，做出好看漂亮的ListView,下面这个例子我通过重写getView修改每个列表的颜色 并且实现用户选中后成高亮状态。
 

 
 

 

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

 

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

    android:layout_width="fill_parent" android:layout_height="wrap_content"> 

    <ImageView android:id="@+id/color_image" 

        android:layout_width="wrap_content" android:layout_height="fill_parent" 

        android:layout_alignParentTop="true" android:layout_alignParentBottom="true" 

        android:adjustViewBounds="true" 

        android:padding="2dip" /> 

    <TextView android:id="@+id/color_title" 

        android:layout_width="fill_parent" android:layout_height="wrap_content" 

        android:layout_toRightOf="@+id/color_image" 

        android:layout_alignParentBottom="true" 

        android:layout_alignParentRight="true" android:singleLine="true" 

        android:ellipsize="marquee"   

        android:textSize="15dip"  /> 

    <TextView android:id="@+id/color_text" 

        android:layout_width="fill_parent" android:layout_height="wrap_content" 

        android:layout_toRightOf="@+id/color_image" 

        android:layout_below="@+id/color_title" 

        android:layout_alignParentBottom="true" 

        android:layout_alignParentRight="true"   

        android:singleLine="true" 

        android:ellipsize="marquee"   

        android:textSize="20dip" /> 

</RelativeLayout> 

public class ColorList extends ListActivity {  

    private String[] mListTitle = { "姓名", "性别", "年龄", "居住地","邮箱"};  

    private String[] mListStr = { "雨松MOMO", "男", "25", "北京",  

        "xuanyusong@gmail.com" };  

    ListView mListView = null;  

    MyListAdapter myAdapter = null;  

    @Override  

    protected void onCreate(Bundle savedInstanceState) {  

    mListView = getListView();  

    myAdapter = new MyListAdapter(this);  

    setListAdapter(myAdapter);  

    mListView.setOnItemClickListener(new OnItemClickListener() {  

        @Override  

        public void onItemClick(AdapterView<?> adapterView, View view, int position,  

            long id) {  

        View v=adapterView.getChildAt(position);  

        v.setBackgroundColor(Color.RED);  

        Toast.makeText(ColorList.this,"您选择了" + mListStr[position], Toast.LENGTH_LONG).show();  

        }  

    });  

      

    super.onCreate(savedInstanceState);  

    }  

 

    class MyListAdapter extends BaseAdapter {  

    private int[] colors = new int[] { 0xff626569, 0xff4f5257 };  

    public MyListAdapter(Context context) {  

        mContext = context;  

    }  

 

    public int getCount() {  

        return mListStr.length;  

    }  

 

    @Override  

    public boolean areAllItemsEnabled() {  

        return false;  

    }  

 

    public Object getItem(int position) {  

        return position;  

    }  

 

    public long getItemId(int position) {  

        return position;  

    }  

 

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

        ImageView iamge = null;  

        TextView title = null;  

        TextView text = null;  

        if (convertView == null) {  

        convertView = LayoutInflater.from(mContext).inflate(R.layout.colorlist, null);  

        iamge = (ImageView) convertView.findViewById(R.id.color_image);  

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

        text= (TextView) convertView.findViewById(R.id.color_text);  

        }   

        int colorPos = position % colors.length;  

        convertView.setBackgroundColor(colors[colorPos]);  

        title.setText(mListTitle[position]);  

        text.setText(mListStr[position]);  

         iamge.setImageResource(R.drawable.jay);  

        return convertView;  

    }  

 

    private Context mContext;  

    }  

} 

 

5.自定义布局ArrayAdapter 
ArrayAdapter是BaseAdapter的子类，ArrayAdapter不仅具有BaseAdapter的所有方法还自定义了一些新的方法来处理列表项，所以单纯的从功能能上来讲ArrayAdapter远远强与BaseAdapter，如果是绘制一些数量比较少的列表建议使用BaseAdapter 如果绘制一些比较复杂的列表项 并且列表项很多的 建议使用ArrayAdapter。

 

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

 

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

    android:layout_width="fill_parent" android:layout_height="wrap_content"> 

    <Button 

        android:id="@+id/array_button" 

        android:layout_width="wrap_content"   

        android:layout_height="wrap_content" 

        android:text="一个按钮" 

    /> 

    <ImageView android:id="@+id/array_image" 

        android:layout_toRightOf="@+id/array_button" 

        android:layout_width="wrap_content" android:layout_height="fill_parent" 

        android:layout_alignParentTop="true" android:layout_alignParentBottom="true" 

        android:adjustViewBounds="true" 

        android:padding="2dip" /> 

    <TextView android:id="@+id/array_title" 

        android:layout_width="fill_parent" android:layout_height="wrap_content" 

        android:layout_toRightOf="@+id/array_image" 

        android:layout_alignParentBottom="true" 

        android:layout_alignParentRight="true" android:singleLine="true" 

        android:ellipsize="marquee"   

        android:textSize="15dip"  /> 

    <TextView android:id="@+id/array_text" 

        android:layout_width="fill_parent" android:layout_height="wrap_content" 

        android:layout_toRightOf="@+id/array_image" 

        android:layout_below="@+id/array_title" 

        android:layout_alignParentBottom="true" 

        android:layout_alignParentRight="true"   

        android:singleLine="true" 

        android:ellipsize="marquee"   

        android:textSize="20dip" /> 

 

</RelativeLayout> 

public class ArrayList extends ListActivity {  

    private String[] mListTitle = { "姓名", "性别", "年龄", "居住地","邮箱"};  

    private String[] mListStr = { "雨松MOMO", "男", "25", "北京",  

        "xuanyusong@gmail.com" };  

    ListView mListView = null;  

    MyListAdapter myAdapter = null;  

    ArrayList arrayList = null;  

    @Override  

    protected void onCreate(Bundle savedInstanceState) {  

    arrayList = this;  

    mListView = getListView();  

    myAdapter = new MyListAdapter(this,R.layout.arraylist);  

    setListAdapter(myAdapter);  

    super.onCreate(savedInstanceState);  

    }  

 

    public class MyListAdapter extends ArrayAdapter<Object> {  

    int mTextViewResourceID = 0;  

    private Context mContext;  

    public MyListAdapter(Context context, int textViewResourceId) {  

        super(context, textViewResourceId);  

        mTextViewResourceID = textViewResourceId;  

        mContext = context;  

    }  

 

    private int[] colors = new int[] { 0xff626569, 0xff4f5257 };  

 

    public int getCount() {  

        return mListStr.length;  

    }  

 

    @Override  

    public boolean areAllItemsEnabled() {  

        return false;  

    }  

 

    public Object getItem(int position) {  

        return position;  

    }  

 

    public long getItemId(int position) {  

        return position;  

    }  

 

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

        ImageView iamge = null;  

        TextView title = null;  

        TextView text = null;  

        Button button = null;  

        if (convertView == null) {  

        convertView = LayoutInflater.from(mContext).inflate(  

            mTextViewResourceID, null);  

        iamge = (ImageView) convertView.findViewById(R.id.array_image);  

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

        text = (TextView) convertView.findViewById(R.id.array_text);  

        button = (Button)convertView.findViewById(R.id.array_button);  

        button.setOnClickListener(new OnClickListener() {  

              

            @Override  

            public void onClick(View arg0) {  

            Toast.makeText(arrayList,"您点击的第"+position +"个按钮", Toast.LENGTH_LONG).show();  

              

            }  

        });  

        }  

        int colorPos = position % colors.length;  

        convertView.setBackgroundColor(colors[colorPos]);  

        title.setText(mListTitle[position]);  

        text.setText(mListStr[position]);  

        if(colorPos == 0)  

        iamge.setImageResource(R.drawable.jay);  

        else  

        iamge.setImageResource(R.drawable.image);  

        return convertView;  

    }  

    }  

} 

 

最后如果你还是觉得我写的不够详细 看的不够爽 不要紧我把源代码的下载地址贴出来 欢迎大家一起讨论学习
雨松MOMO希望可以和大家一起进步。

下载地址： http://download.csdn.net/source/3471700

本文出自 “雨松MOMO的程序世界” 博客，请务必保留此出处http://xys289187120.blog.51cto.com/3361352/657171