Android提高第十五篇之ListView自适应实现表格

本文来自http://blog.csdn.net/hellogv/ ，引用必须注明出处！
上次介绍了使用GridView实现表格，这次就说说如何用ListView实现自适应的表格。GridView比ListView更容易实现自适应的表格，但是GridView每个格单元的大小固定，而ListView实现的表格可以自定义每个格单元的大小，但因此实现自适应表格也会复杂些(格单元大小不一)。另外，GridView实现的表格可以定位在具体某个格单元，而ListView实现的表格则只能定位在表格行。因此还是那句老话：根据具体的使用环境而选择GridView 或者 ListView实现表格。

先贴出本文程序运行的效果图：



本文实现的ListView表格，可以每个格单元大小不一，文本(TextView)或图片(ImageView)做格单元的数据，不需要预先定义XML实现样式(自适应的根本目标)。由于ListView置于HorizontalScrollView中，因此对于列比较多/列数据比较长的数据表也能很好地适应其宽度。
main.xml源码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<HorizontalScrollView android:id="@+id/HorizontalScrollView01"
		android:layout_height="fill_parent" android:layout_width="fill_parent">
		<ListView android:id="@+id/ListView01" android:layout_height="wrap_content"
			android:layout_width="wrap_content"></ListView>
	</HorizontalScrollView>
</LinearLayout>

主类testMyListView.java的源码如下：

package com.testMyListView;
import java.util.ArrayList;
import com.testMyListView.TableAdapter.TableCell;
import com.testMyListView.TableAdapter.TableRow;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.LinearLayout.LayoutParams;
import android.widget.Toast;
/**
 * @author hellogv
 */
public class testMyListView extends Activity {
	/** Called when the activity is first created. */
	ListView lv;
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		this.setTitle("ListView自适应实现表格---hellogv");
		lv = (ListView) this.findViewById(R.id.ListView01);
		ArrayList<TableRow> table = new ArrayList<TableRow>();
		TableCell[] titles = new TableCell[5];// 每行5个单元
		int width = this.getWindowManager().getDefaultDisplay().getWidth()/titles.length;
		// 定义标题
		for (int i = 0; i < titles.length; i++) {
			titles[i] = new TableCell("标题" + String.valueOf(i), 
									width + 8 * i,
									LayoutParams.FILL_PARENT, 
									TableCell.STRING);
		}
		table.add(new TableRow(titles));
		// 每行的数据
		TableCell[] cells = new TableCell[5];// 每行5个单元
		for (int i = 0; i < cells.length - 1; i++) {
			cells[i] = new TableCell("No." + String.valueOf(i),
									titles[i].width, 
									LayoutParams.FILL_PARENT, 
									TableCell.STRING);
		}
		cells[cells.length - 1] = new TableCell(R.drawable.icon,
												titles[cells.length - 1].width, 
												LayoutParams.WRAP_CONTENT,
												TableCell.IMAGE);
		// 把表格的行添加到表格
		for (int i = 0; i < 12; i++)
			table.add(new TableRow(cells));
		TableAdapter tableAdapter = new TableAdapter(this, table);
		lv.setAdapter(tableAdapter);
		lv.setOnItemClickListener(new ItemClickEvent());
	}
	class ItemClickEvent implements AdapterView.OnItemClickListener {
		@Override
		public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
				long arg3) {
			Toast.makeText(testMyListView.this, "选中第"+String.valueOf(arg2)+"行", 500).show();
		}
	}
}

ListView自适应实现Table的类TableAdapter.java代码如下：
PS：TableCell是格单元的类，TableRow是表格行的类，TableRowView是实现表格行的组件。实现步骤：TableCell --> TableRow（TableRowView）-->ListView

package com.testMyListView;
import java.util.List;
import android.content.Context;
import android.graphics.Color;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
public class TableAdapter extends BaseAdapter {
	private Context context;
	private List<TableRow> table;
	public TableAdapter(Context context, List<TableRow> table) {
		this.context = context;
		this.table = table;
	}
	@Override
	public int getCount() {
		return table.size();
	}
	@Override
	public long getItemId(int position) {
		return position;
	}
	public TableRow getItem(int position) {
		return table.get(position);
	}
	public View getView(int position, View convertView, ViewGroup parent) {
		TableRow tableRow = table.get(position);
		return new TableRowView(this.context, tableRow);
	}
	/**
	 * TableRowView 实现表格行的样式
	 * @author hellogv
	 */
	class TableRowView extends LinearLayout {
		public TableRowView(Context context, TableRow tableRow) {
			super(context);
			
			this.setOrientation(LinearLayout.HORIZONTAL);
			for (int i = 0; i < tableRow.getSize(); i++) {//逐个格单元添加到行
				TableCell tableCell = tableRow.getCellValue(i);
				LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
						tableCell.width, tableCell.height);//按照格单元指定的大小设置空间
				layoutParams.setMargins(0, 0, 1, 1);//预留空隙制造边框
				if (tableCell.type == TableCell.STRING) {//如果格单元是文本内容
					TextView textCell = new TextView(context);
					textCell.setLines(1);
					textCell.setGravity(Gravity.CENTER);
					textCell.setBackgroundColor(Color.BLACK);//背景黑色
					textCell.setText(String.valueOf(tableCell.value));
					addView(textCell, layoutParams);
				} else if (tableCell.type == TableCell.IMAGE) {//如果格单元是图像内容
					ImageView imgCell = new ImageView(context);
					imgCell.setBackgroundColor(Color.BLACK);//背景黑色
					imgCell.setImageResource((Integer) tableCell.value);
					addView(imgCell, layoutParams);
				}
			}
			this.setBackgroundColor(Color.WHITE);//背景白色，利用空隙来实现边框
		}
	}
	/**
	 * TableRow 实现表格的行
	 * @author hellogv
	 */
	static public class TableRow {
		private TableCell[] cell;
		public TableRow(TableCell[] cell) {
			this.cell = cell;
		}
		public int getSize() {
			return cell.length;
		}
		public TableCell getCellValue(int index) {
			if (index >= cell.length)
				return null;
			return cell[index];
		}
	}
	/**
	 * TableCell 实现表格的格单元
	 * @author hellogv
	 */
	static public class TableCell {
		static public final int STRING = 0;
		static public final int IMAGE = 1;
		public Object value;
		public int width;
		public int height;
		private int type;
		public TableCell(Object value, int width, int height, int type) {
			this.value = value;
			this.width = width;
			this.height = height;
			this.type = type;
		}
	}
}