昨天翻了翻Android的Canvas函数，发现这玩意和以前用VC时，用的API差不多搞法，以前做数据库方面的系统时，都是直接用API画的报表，
现在用Android来再试试手看看，感受感受，弄了下，不完善，但大致效果出来了,效果图如下:
用Android的API,要比VC的那一套灵活多了，就是分辨率太多，还有个横向的问题。
代码简单，实现的部份代码在下面。
1. 主程序文件:
package com.xcl.canvas;
/**
* Canvas练习
* 画一张报表玩玩,反正这事以前用VC时没少干.
* author:xcl
* date:2014-4-5
*/
import com.xcl.canvas.box.DrawRptFooter;
import com.xcl.canvas.box.DrawRptHeader;
import com.xcl.canvas.box.DrawRptTable;
import com.xcl.canvas.box.XclRptInterface;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.util.DisplayMetrics;
import android.view.Menu;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
setContentView(new PanelRpt(this));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void onDraw(Canvas canvas){
}
class PanelRpt extends View {
Paint paint;
private int ScrHeight;
private int ScrWidth;
private XclRptInterface xRpt = null;
public PanelRpt(Context context){
super(context);
DisplayMetrics dm = getResources().getDisplayMetrics();
ScrHeight = dm.heightPixels;
ScrWidth = dm.widthPixels;
paint = new Paint();
paint.setColor(Color.RED);// 设置红色
}
public void onDraw(Canvas canvas){
int HeaderHeight = 200;
int FooterHeight = 100;
int startx = 10;
int starty = 10;
//报表Logo
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xcllogo);
canvas.drawColor(Color.WHITE);
canvas.drawBitmap(bitmap, startx,starty, paint);
//表头
xRpt = new DrawRptHeader();
xRpt.SetRptSize(ScrWidth,HeaderHeight);
xRpt.draw(canvas);
//表明细
DrawRptTable xRptTable = new DrawRptTable();
xRptTable.SetRptSize(ScrWidth,ScrHeight);
xRptTable.SetRptSpan(HeaderHeight,FooterHeight);
xRptTable.draw(canvas);
//表尾
DrawRptFooter xRptFooter = new DrawRptFooter();
xRptFooter.SetRptSize(ScrWidth,ScrHeight);
xRptFooter.SetRptSpan(FooterHeight);
xRptFooter.draw(canvas);
}
}
}
2. 接口类
package com.xcl.canvas.box;
/**
* Canvas练习 --报表接口
*
* author:xcl
* date:2014-4-5
*/
import android.graphics.Canvas;
public interface XclRptInterface {
//左间距
public final int PageLeftSpan = 10;
//右间距
public final int PageRightSpan = 10;
//上间距
public final int PageTopSpan = 10;
//字体大小
public final int RptFontHeader = 40;
public final int RptFontTable = 18;
//设置线条粗细
public final int RptStrokeWidth = 12;
//报表显示页画布大小
public void SetRptSize(int width,int height);
//画布
public void draw(Canvas canvas);
}
3.画报表表格的代码如下:
package com.xcl.canvas.box;
/**
* Canvas练习 --表明细
*
* author:xcl
* date:2014-4-5
*/
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
public class DrawRptTable implements XclRptInterface {
private Paint PaintText = null;
private Paint PaintLine = null;
//报表页面大小
private int RptHeight = 0;
private int RptWidth = 0;
//总行数
private int RowCount = 6;
//表头高度
private int RptHeader = 0;
//表尾高度
private int RptFooter = 0;
//确定列分隔线的X坐标
private int TabCol0PosLn = 0;
private int TabCol1PosLn = 0;
private int TabCol2PosLn = 0;
private int TabCol3PosLn = 0;
//确定列中文字显示位置（X坐标）
private int TabCol0PosText = 0;
private int TabCol1PosText = 0;
private int TabCol2PosText = 0;
//文字上移间距
private final int RowTextMvSpan = 20;
//表格最上面的间距
private final int TabTopPosY = 100;
public DrawRptTable() {
// TODO Auto-generated constructor stub
//画文字的画笔
PaintText = new Paint();
PaintText.setAntiAlias(true);
//绘制直线
PaintText.setColor(Color.BLUE);
//设置线条粗细
PaintText.setStrokeWidth(12);
//设置字体及大小
Typeface serif_italic = Typeface.create(Typeface.SERIF,Typeface.ITALIC);
PaintText.setTypeface(serif_italic);
PaintText.setTextSize(RptFontTable);
//划线的画笔
PaintLine = new Paint();
PaintLine.setStrokeWidth(2);
PaintLine.setColor(Color.BLACK);
PaintLine.setStyle(Paint.Style.STROKE);
}
@Override
public void draw(Canvas canvas) {
// TODO Auto-generated method stub
//当前显示页可显示的高度
int TableHeight = RptHeight - RptHeader - RptFooter;
//依高度与总行数算出行间距
int RowSpan = TableHeight / RowCount;
//初始化表格显示位置
int startx = PageTopSpan ;
int starty = TabTopPosY;
int endx = RptWidth - PageRightSpan;
int endy = TabTopPosY;
//确定列分隔线的X坐标
TabCol0PosLn = PageLeftSpan;
TabCol1PosLn = RptWidth - PageRightSpan;
TabCol2PosLn = RptWidth/10*2;
TabCol3PosLn = RptWidth/10*6;
//确定列中文字显示位置（X坐标）
TabCol0PosText = RptWidth/10;
TabCol1PosText = RptWidth/10*2;
TabCol2PosText = RptWidth/10*6;
int CurTextPosY = 0;
//开始画表格
canvas.drawLine( startx ,starty,endx,endy, PaintLine);
for(int i=0;i<RowCount;i++)
{
starty = starty + RowSpan;
endy = endy + RowSpan;
CurTextPosY = starty - RowTextMvSpan;
if( i == 0) //表头
{
canvas.drawText("ID", TabCol0PosText,CurTextPosY, PaintText);
canvas.drawText("NAME",TabCol1PosText,CurTextPosY, PaintText);
canvas.drawText("MAIL",TabCol2PosText,CurTextPosY, PaintText);
}else{
//表格内容
canvas.drawText(Integer.toString(i), TabCol0PosText,CurTextPosY, PaintText);
canvas.drawText("xiongchuanliang", TabCol1PosText,CurTextPosY, PaintText);
canvas.drawText("xcl_168@aliyun.com",TabCol2PosText,CurTextPosY, PaintText);
}
//画行分隔线
canvas.drawLine( startx ,starty,endx,endy, PaintLine);
}
//画列分隔线
//左边线
canvas.drawLine( TabCol0PosLn ,TabTopPosY,TabCol0PosLn,endy, PaintLine);
//列间隔线1
canvas.drawLine( TabCol1PosLn ,TabTopPosY,TabCol1PosLn,endy, PaintLine);
//列间隔线2
canvas.drawLine( TabCol2PosLn ,TabTopPosY,TabCol2PosLn,endy, PaintLine);
//右边线
canvas.drawLine( TabCol3PosLn ,TabTopPosY,TabCol3PosLn,endy, PaintLine);
}
@Override
public void SetRptSize(int width,int height) {
// TODO Auto-generated method stub
RptWidth = width;
RptHeight = height;
}
public void SetRptSpan(int headerHeight,int footerHeight) {
// TODO Auto-generated method stub
RptHeader = headerHeight;
RptFooter = footerHeight;
}
}
例子中的表头和表尾高度是写死的，适配时可以去计算得出。
报表中表格的数据需要连上数据库，再加上分页及导出功能才算实用，不弄这些了。
MAIL: xcl_168@aliyun.com
BLOG: http://blog.csdn.net/xcl168