package com.loaderman.customviewdemo;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.util.AttributeSet;import android.view.View;public class RectView extends View {    private Paint mPaint;    public RectView(Context context) {        super(context);        init();    }    public RectView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public RectView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        init();    }    private void init() {        mPaint = new Paint();        mPaint.setTextSize(30);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //画大方        mPaint.setColor(Color.RED);        canvas.drawRect(new Rect(10, 10, 600, 600),mPaint);        //画中方        mPaint.setColor(Color.GREEN);        canvas.drawRect(new Rect(30, 30, 570, 570),mPaint);        //画小方        mPaint.setColor(Color.BLUE);        canvas.drawRect(new Rect(60, 60, 540, 540),mPaint);        //画小小圆        mPaint.setColor(Color.argb(0x3F, 0xFF, 0xFF, 0xFF));        canvas.drawCircle(300, 300, 100, mPaint);        //写字        mPaint.setColor(Color.GREEN);        canvas.drawText( "6", 300, 300, mPaint);    }}

效果: