listView 添加多个不同的adapter。

有时候我们想在listView上分类，或者呢 有时候一行显示两列内容，有时候需要三列内容 ，那怎么实现呢，这里呢就要使用

class Section {
		String caption;
		Adapter adapter;
		
		Section(String caption, Adapter adapter) {
			this.caption=caption;
			this.adapter=adapter;
		}
	}

 

自定义一个类，这个类呢包含多个adapter就可以了，想用那种就用那种。

abstract public class SectionedAdapter extends BaseAdapter {
	abstract protected View getHeaderView(String caption,int index,View convertView,ViewGroup parent);
	
	private List<Section> sections=new ArrayList<Section>();
	private static int TYPE_SECTION_HEADER=0;

	public SectionedAdapter() {
		super();
	}

	public void addSection(String caption, Adapter adapter) {
		sections.add(new Section(caption, adapter));
	}

	public Object getItem(int position) {
		for (Section section : this.sections) {
			if (position==0) {
				return(section);
			}
			
			int size=section.adapter.getCount()+1;

			if (position<size) {
				return(section.adapter.getItem(position-1));
			}

			position-=size;
		}
		
		return(null);
	}

	public int getCount() {
		int total=0;
		
		for (Section section : this.sections) {
			total+=section.adapter.getCount()+1; // add one for header
		}
		
		return(total);
	}

	public int getViewTypeCount() {
		int total=1;	// one for the header, plus those from sections
		
		for (Section section : this.sections) {
			total+=section.adapter.getViewTypeCount();
		}
		
		return(total);
	}

	public int getItemViewType(int position) {
		int typeOffset=TYPE_SECTION_HEADER+1;	// start counting from here
		
		for (Section section : this.sections) {
			if (position==0) {
				return(TYPE_SECTION_HEADER);
			}
			
			int size=section.adapter.getCount()+1;

			if (position<size) {
				return(typeOffset+section.adapter.getItemViewType(position-1));
			}

			position-=size;
			typeOffset+=section.adapter.getViewTypeCount();
		}
		
		return(-1);
	}

	public boolean areAllItemsSelectable() {
		return(false);
	}

	public boolean isEnabled(int position) {
		return(getItemViewType(position)!=TYPE_SECTION_HEADER);
	}

	@Override
	public View getView(int position, View convertView,
											ViewGroup parent) {
		int sectionIndex=0;
		
		for (Section section : this.sections) {
			if (position==0) {
				return(getHeaderView(section.caption, sectionIndex,convertView, parent));
			}

			int size=section.adapter.getCount()+1;

			if (position<size) {
				return(section.adapter.getView(position-1,	convertView,parent));
			}

			position-=size;
			sectionIndex++;
		}
		
		return(null);
	}

	@Override
	public long getItemId(int position) {
		return(position);
	}

	class Section {
		String caption;
		Adapter adapter;
		
		Section(String caption, Adapter adapter) {
			this.caption=caption;
			this.adapter=adapter;
		}
	}
}

 

然后主类就是

public class SectionedDemo extends ListActivity {
	private static String[] items={"lorem", "ipsum", "dolor","purus"};
	
	@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);
		setContentView(R.layout.main);
		
		adapter.addSection("Original",new ArrayAdapter<String>(this,
													android.R.layout.simple_list_item_1,
													items));
		
		List<String> list=Arrays.asList(items);
		
		Collections.shuffle(list);

		adapter.addSection("Shuffled",new ArrayAdapter<String>(this,
													android.R.layout.simple_list_item_1,
													list));
		
		list=Arrays.asList(items);
		
		Collections.shuffle(list);

		adapter.addSection("Re-shuffled",new ArrayAdapter<String>(this,
													android.R.layout.simple_list_item_1,
													list));
		
		setListAdapter(adapter);
	}
	
	SectionedAdapter adapter=new SectionedAdapter() {
		protected View getHeaderView(String caption, int index,View convertView,ViewGroup parent) {
			TextView result=(TextView)convertView;
			
			if (convertView==null) {
				result=(TextView)getLayoutInflater().inflate(R.layout.header, null);
			}
			
			result.setText(caption);
			
			return(result);
		}
	};
}

 

其他的就需要你自己变化了，我这里只是吧内容打乱。

 有些东西我只是简单调解没有源码或者我认为很简单的就不提供了。

对于复杂一些或者很难说清的 本人表达能力有限会把源码发上的