Android Canvas学习笔记（1）

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画图形的代码自己记录一下

package com.example.lesson32_canvas;import android.R.color;import android.os.Bundle;import android.app.Activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.view.Menu;import android.view.View;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//引用setContentView(new MyView(this));}//声明画笔public Paint paint = new  Paint();//创建Viewpublic class MyView extends View{public MyView(Context context) {super(context);// TODO Auto-generated constructor stub}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);//设置画布背景颜色(白色)canvas.drawColor(0xffffffff);//保存当前图形的一个可编辑或一个剪辑的状态canvas.save();paint.setColor(Color.RED);//canvas.drawRect(0,0,100,50, paint);canvas.drawCircle(50, 40, 40, paint);//释放资源canvas.restore();}}}