Android提高第十五篇之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;          }      }  }