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; } } }