package com.android.xiong.canvastest;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 MyView extends View {// 重写该方法 ，进行绘画@Overrideprotected 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 rel = new RectF(10, 200, 70, 230);// 绘制椭圆矩形canvas.drawRoundRect(rel, 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Path进行绘制，绘制三角形canvas.drawPath(path1, paint);// 定义一个Patch对象，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，绘制五角星canvas.drawPath(path2, paint);paint.setColor(Color.RED);paint.setStyle(Paint.Style.FILL);canvas.drawCircle(120, 40, 30, paint);// 绘制正方形canvas.drawCircle(120, 40, 30, paint);// 绘制矩形canvas.drawRect(90, 150, 150, 190, 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);// ----------设置渐变器后绘制----------// 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);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();// 根据Path进行绘制，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();// 根据Path进行绘制，绘制五角形canvas.drawPath(path6, paint);// ----------设置字符大小后绘制----------paint.setTextSize(24);paint.setShader(null);// 绘制7个字符串canvas.drawText(getResources().getString(R.string.circle), 240, 50,paint);canvas.drawText(getResources().getString(R.string.square), 240, 120,paint);canvas.drawText(getResources().getString(R.string.rect), 240, 175,paint);canvas.drawText(getResources().getString(R.string.round_rect), 230,220, paint);canvas.drawText(getResources().getString(R.string.oval), 240, 260,paint);canvas.drawText(getResources().getString(R.string.triangle), 240, 325,paint);canvas.drawText(getResources().getString(R.string.pentagon), 240, 390,paint);}public MyView(Context context,AttributeSet set) {super(context,set);}}
<?xml version="1.0" encoding="utf-8"?><resources><string name="hello">Hello World, CanvasTest!</string><string name="app_name">绘图入门</string> <string name="circle">圆形</string> <string name="square">正方形</string> <string name="rect">长方形</string> <string name="round_rect">圆角矩形</string> <string name="oval">椭圆形</string> <string name="triangle">三角形</string> <string name="pentagon">五角形</string></resources>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <com.android.xiong.canvastest.MyView android:layout_width="wrap_content" android:layout_height="wrap_content"/></RelativeLayout>
