Android提高之ListView實現自適應表格的方法

前面有文章介紹了使用GridView實現表格的方法，本文就來說說如何用ListView實現自適應的表格。GridView比ListView更容易實現自適應的表格，但是GridView每個格單元的大小固定，而ListView實現的表格可以自定義每個格單元的大小，但因此實現自適應表格也會復雜些(主要由於格單元大小不一)。此外，GridView實現的表格可以定位在具體某個格單元，而ListView實現的表格則只能定位在表格行。因此還是那句老話：根據具體的使用環境而選擇GridView 或者 ListView實現表格。

先來看看本文程序運行的效果圖，如下圖所示：

本文實現的ListView表格，可以每個格單元大小不一，文本(TextView)或圖片(ImageView)做格單元的數據，不需要預先定義XML實現樣式(自適應的根本目標)。由於ListView置於HorizontalScrollView中，因此對於列比較多/列數據比較長的數據表也能很好地適應其寬度。

main.xml源碼如下：

<?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>

主類testMyListView.java的源碼如下：

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自適應實現表格---hellogv");
 lv = (ListView) this.findViewById(R.id.ListView01);
 ArrayList<TableRow> table = new ArrayList<TableRow>();
 TableCell[] titles = new TableCell[5];// 每行5個單元
 int width = this.getWindowManager().getDefaultDisplay().getWidth()/titles.length;
 // 定義標題
 for (int i = 0; i < titles.length; i++) {
  titles[i] = new TableCell("標題" + String.valueOf(i), 
   width + 8 * i,
   LayoutParams.FILL_PARENT, 
   TableCell.STRING);
 }
 table.add(new TableRow(titles));
 // 每行的數據
 TableCell[] cells = new TableCell[5];// 每行5個單元
 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, "選中第"+String.valueOf(arg2)+"行", 500).show();
 }
 }
}

ListView自適應實現Table的類TableAdapter.java代碼如下：

此處需要注意：TableCell是格單元的類，TableRow是表格行的類，TableRowView是實現表格行的組件。實現步驟：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 實現表格行的樣式
 * @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++) {//逐個格單元添加到行
  TableCell tableCell = tableRow.getCellValue(i);
  LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
   tableCell.width, tableCell.height);//按照格單元指定的大小設置空間
  layoutParams.setMargins(0, 0, 1, 1);//預留空隙制造邊框
  if (tableCell.type == TableCell.STRING) {//如果格單元是文本內容
   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) {//如果格單元是圖像內容
   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，利用空隙來實現邊框
 }
 }
 /**
 * TableRow 實現表格的行
 * @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 實現表格的格單元
 * @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;
 }
 }
}

希望本文所述實例能夠對大家進行Android項目開發有所幫助。