Android软件开发之ListView 详解 (十一)

晨曦之光 发布于 2012/03/07 11:50
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Android软件开发之ListView 详解




雨松MOMO原创文章如转载,请注明:转载自雨松MOMO的博客原文地址:http://blog.csdn.net/xys289187120/article/details/6636139



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

原文链接:http://blog.csdn.net/xys289187120/article/details/6636139
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