点击切换listView的列数（一列变为两列）

这是一个简单的小demo，点击一下radiobutton，切换listview的列数：

主要代码还是在自定义的BasaAdapter的getView中来实现的：

因为时间匆忙，所以就将就这样用吧，以后有空再更改吧：

大概是这样的效果：

还有这样的：

BaseAdapter子类：

public class MyAdapter extends BaseAdapter {
	/** 布局是会变的 */
	private int layoutId;
	private Context context;
	private ArrayList<String> data;
	/** 1:single 2:double */
	private int flag = 1;

	public MyAdapter(Context context, int layoutId, ArrayList<String> data,
			int flag) {
		this.context = context;
		this.layoutId = layoutId;
		this.data = data;
		this.flag = flag;
	}

	public int getLayoutId() {
		return layoutId;
	}

	public void setLayoutId(int layoutId) {
		this.layoutId = layoutId;
	}

	public int getFlag() {
		return flag;
	}

	public void setFlag(int flag) {
		this.flag = flag;
	}

	@Override
	public int getCount() {
		// TODO Auto-generated method stub

		return data.size() / flag;
	}

	@Override
	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	@SuppressWarnings("null")
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		HoldeView holdeView = null;

		if (convertView == null) {
			holdeView = new HoldeView();
			LayoutInflater inflater = LayoutInflater.from(context);
			convertView = inflater.inflate(layoutId, null);
			if (flag == 1) {
				holdeView.t_single = (TextView) convertView
						.findViewById(R.id.tv_single);
			} else if (flag == 2) {
				holdeView.t_d_1 = (TextView) convertView
						.findViewById(R.id.tv_d_1);
				holdeView.t_d_2 = (TextView) convertView
						.findViewById(R.id.tv_d_2);
			}
			convertView.setTag(R.id.convertview_holdview, holdeView);
		} else {
			holdeView = (HoldeView) convertView
					.getTag(R.id.convertview_holdview);

		}
		/** 设置数据 */
		return convertView;
	}

	static class HoldeView {
		TextView t_single;
		TextView t_d_1;
		TextView t_d_2;
	}
}

Activity的代码：

public class MainActivity extends Activity implements OnCheckedChangeListener {
	private RadioGroup rg;
	private ListView lv;
	private MyAdapter adapter;
	private ArrayList<String> data;

	private int flag = 1;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		rg = (RadioGroup) findViewById(R.id.rg);
		lv = (ListView) findViewById(R.id.lv);
		data = new ArrayList<String>();
		addData();
		adapter = new MyAdapter(MainActivity.this, R.layout.single, data, 1);
		lv.setAdapter(adapter);
		rg.setOnCheckedChangeListener(this);
		((RadioButton) (rg.getChildAt(0))).setChecked(true);
	}

	private void addData() {
		for (int i = 0; i < 60; i++) {
			data.add(i + "");
		}
	}

	@Override
	public void onCheckedChanged(RadioGroup group, int checkedId) {
		// TODO Auto-generated method stub
		int currentitem = 0;
		switch (checkedId) {
		case R.id.rb_single:
			currentitem = lv.getFirstVisiblePosition();
			flag = 1;
			adapter.setFlag(flag);
			// adapter.setLayoutId(R.layout.single);
			adapter = new MyAdapter(MainActivity.this, R.layout.single, data,
					flag);
			lv.setAdapter(adapter);
			/** 刷新一下listview */
			lv.invalidate();
			lv.setSelection(currentitem * 2);
			break;
		case R.id.rb_double:
			currentitem = lv.getFirstVisiblePosition();
			Log.e("positon", currentitem + "");
			flag = 2;
			adapter.setFlag(flag);

			adapter = new MyAdapter(MainActivity.this, R.layout.double_layout,
					data, flag);
			lv.setAdapter(adapter);
			/** 刷新一下listview */
			lv.invalidate();
			lv.setSelection(currentitem / 2);
			break;
		}
	}
}

代码地址： http://download.youkuaiyun.com/detail/yymonkeydo/8128661