下面是一个画各种图形的例子，具体的画图方法不用特别解释，看API就可以了
先定义一个继承自View的类DrawView
[java]
package WangLi.Graphics.MyView;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.view.View;
public class DrawView extends View {
public DrawView(Context context,AttributeSet set)
{
super(context,set);
}
@Override
//重写该方法,进行绘图
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
//把整张画布绘制成白色
canvas.drawColor(Color.WHITE);
Paint paint = new Paint();
//去锯齿
paint.setAntiAlias(true);
paint.setColor(Color.BLUE);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(3);
//绘制圆形
canvas.drawCircle(40, 40, 30, paint);
//绘制正方形
canvas.drawRect(10,80,70,140, paint);
//绘制矩形
canvas.drawRect(10,150,70,190, paint);
RectF re1 = new RectF(10,200,70,230);
//绘制圆角矩形
canvas.drawRoundRect(re1, 15, 15, paint);
RectF rel1 = new RectF(10,240,70,270);
//绘制椭圆
canvas.drawOval(rel1, paint);
//定义一个Path对象,封闭成一个三角形
Path path1 = new Path();
path1.moveTo(10, 340);
path1.lineTo(70, 340);
path1.lineTo(40, 290);
path1.close();
//根据path进行绘制,绘制三角形
canvas.drawPath(path1,paint);
//根据path进行绘制,封闭成一个五角形
Path path2 = new Path();
path2.moveTo(26, 360);
path2.lineTo(54, 360);
path2.lineTo(70, 392);
path2.lineTo(40, 420);
path2.lineTo(10, 392);
path2.close();
//根据path进行绘制,绘制五角形
canvas.drawPath(path2,paint);
//-----------------设置填充风格后绘制------------------
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.RED);
canvas.drawCircle(120, 40, 30, paint);
//绘制正方形
canvas.drawRect(90, 80, 150, 140, paint);
//绘制矩形
canvas.drawRect(90, 150, 150, 190, paint);
RectF re2 = new RectF(90,200,150,230);
//绘制圆角矩形
canvas.drawRoundRect(re2, 15, 15, paint);
RectF re21 = new RectF(90,240,150,270);
//绘制椭圆
canvas.drawOval(re21, paint);
Path path3 = new Path();
path3.moveTo(90, 340);
path3.lineTo(150, 340);
path3.lineTo(120, 290);
path3.close();
//绘制三角形
canvas.drawPath(path3, paint);
Path path4 = new Path();
path4.moveTo(106, 360);
path4.lineTo(134, 360);
path4.lineTo(150, 392);
path4.lineTo(120, 420);
path4.lineTo(90, 392);
path4.close();
//绘制五角形
canvas.drawPath(path4, paint);
//-----------------设置渐变后绘制------------------
//为Paint设置渐变器
Shader mShader = new LinearGradient(0,0,40,60,
new int[]{
Color.RED,Color.GREEN,Color.BLUE,Color.YELLOW},
null,Shader.TileMode.REPEAT);
//为Paint设置渐变器
paint.setShader(mShader);
//设置阴影
paint.setShadowLayer(45, 10, 10, Color.GRAY);
//绘制圆形
canvas.drawCircle(200, 40, 30, paint);
//绘制正方形
canvas.drawRect(170, 80, 230, 140, paint);
//绘制矩形
canvas.drawRect(170, 150, 230, 190, paint);
RectF re3 = new RectF(170,200,230,230);
//绘制圆角矩形
canvas.drawRoundRect(re3, 15, 15, paint);
RectF re31 = new RectF(170,240,230,270);
//绘制椭圆
canvas.drawOval(re31, paint);
Path path5 = new Path();
path5.moveTo(170, 340);
path5.lineTo(230, 340);
path5.lineTo(200, 290);
path5.close();
//绘制三角形
canvas.drawPath(path5, paint);
Path path6 = new Path();
path6.moveTo(186, 360);
path6.lineTo(214, 360);
path6.lineTo(230, 392);
path6.lineTo(200, 420);
path6.lineTo(170, 392);
path6.close();
//绘制五角形
canvas.drawPath(path6, paint);
}
}
再到main.xml中直接进行引用
[html] view plain<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:id="@+id/root">
<WangLi.Graphics.MyView.DrawView android:layout_width="wrap_content" android:layout_height="wrap_content" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:id="@+id/root">
<WangLi.Graphics.MyView.DrawView android:layout_width="wrap_content" android:layout_height="wrap_content" />
</LinearLayout>
以上有填充，渐变，其实还可以放文字上去，例子上我就不弄了，很简单
canvas.drawText("some text",x,y,paint);
下面是运行的效果图
