Android提高篇之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;
        }
    }
}