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
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
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/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
