Android_自定义View拖拽重绘

activity

package com.lxf;import android.app.Activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.os.Bundle;import android.view.View;/** * @address BeiJing * @author LiXufei * @function  自定义view */public class cCustomView extends Activity{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(new customView(cCustomView.this));    }    class customView extends View{        private Paint mPaint;        public customView(Context context) {            super(context);            mPaint = new Paint();         }        @Override        protected void onDraw(Canvas canvas) {            super.onDraw(canvas);            //画文字            mPaint.setColor(Color.RED); //设置画笔颜色            mPaint.setTextSize(50.0f);  //设置字体大小            mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);//消除锯齿            canvas.drawText("自定义View", 200.0f, 60.0f,mPaint);   //1、文字内容    2、x点距离  3、y点距离 4、画笔            //画直线            mPaint.setColor(Color.BLUE);            mPaint.setStrokeWidth(8.0f);            canvas.drawLine(0.0f, 100.0f, 700.0f, 100.0f, mPaint);            //画圆            mPaint.setColor(Color.CYAN);            canvas.drawCircle(300.0f, 300.0f, 100.0f, mPaint);            //画矩形            mPaint.setColor(Color.GRAY);            canvas.drawRect(200.0f, 420.0f,400.0f,600.0f, mPaint);  //前俩个是矩形左上角坐标，后面俩个是右下角坐标             //画多边形            mPaint.setColor(Color.BLACK);            Path path = new Path();            float startX = 270.0f;            float startY = 700.0f;            path.moveTo(startX,startY);            path.lineTo(startX, startY);            path.lineTo(startX+50, startY);            path.lineTo(startX, startY+50);            path.lineTo(startX+50, startY+50);            path.close();            canvas.drawPath(path, mPaint);        }    } }
activity

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