Android提高第十五篇之ListView自适应实现表格

 

本文来自http://blog.youkuaiyun.com/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;  
        }  
    }  
}