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;
}
}
}
