서피스뷰 예제 따라했는데 몇개의 클래스함수에 에러가 납니다.

Question

public class ReDraw1 extends Activity {

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_re_draw1);

    }

 

    class MyView extends View {

    ArrayList<Vertex> Picture;

   

    public MyView(Context context) {

super(context);

// TODO Auto-generated constructor stub

}

    }

 

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.re_draw1, menu);

        return true;

    }

    

    public void onDraw(Canvas canvas) {

    Paint Pnt = new Paint();

   

    LinearGradient lshader = new LinearGradient(0, 0, 480, 0, Color.DKGRAY, Color.LTGRAY, TileMode.REPEAT);

    Pnt.setShader(lshader);

    canvas.drawRect(0, 0, getWidth(), getHeight(), Pnt);

    Pnt.setShader(null);

   

    Pnt.setStyle(Paint.Style.STROKE);

    Pnt.setStrokeWidth(2);

    Pnt.setColor(0x80ff0000);

    for (int x = 0; x < 7; x++) {

    for (int y = 0; y < 7; y++) {

    Path path = new Path();

    path.moveTo(x*70, y*70);

    for (int dis = 32; dis > 1; dis--) {

    switch (dis % 4) {

    case 0:

    path.rLineTo(dis*2, 0);

    break;

    case 3:

    path.rLineTo(0, dis*2);

    break;

    case 2:

    path.rLineTo(-dis*2, 0);

    break;

    case 1:

    path.rLineTo(0, -dis*2);

    break;

    }

    }

   

    canvas.drawPath(path, Pnt);

    }

    }

   

    Pnt.setColor(Color.BLACK);

    Pnt.setStrokeWidth(3);

    Pnt.setAntiAlias(true);

    for (int i = 0; i < Picture.size(); i++) {

    if ( Picture.get(i).Draw ) {

    canvas.drawLine(Picture.get(i-1).x, Picture.get(i-1).y, Picture.get(i).x, Picture.get(i).y, Pnt);

    }

    }

    }

 

@Override

public boolean onTouchEvent(MotionEvent event) {

// TODO Auto-generated method stub

if (event.getAction() == MotionEvent.ACTION_DOWN) {

Picture.add(new Vertex(event.getX(), event.getY(), true));

invalidate();

return true;

}

 

return false;

}

    

    

}

 

package com.example.redraw1;

 

public class Vertex {

 

float x;

float y;

boolean Draw;

 

Vertex(float ax, float ay, boolean ad) {

x = ax;

y = ay;

Draw = ad;

}

}

 

책에 있는 예제를 그대로 쳤는데 getWidth(), getHeight(), Picture.size(), Picture.get(), Picture.add(), invalidate()

 

클래스 정의를 보면 분명 존재하는 함수같은데 막상 .찍어보면 목록에 나오질 않구..

 

어떻게 해결해야 되는지 알려주시면 감사하겠습니다!

Answer 1

Activity 에는 getWidth() 함수 없어요.

onDraw 함수를 MyView  클래스 안으로 집어넣어야할것 같은 강한 냄새가 나네요

Comments

답변 감사합니다 덕분에 해결됐네요..^^

Answer 2

package com.example.redraw1;

 

import java.util.ArrayList;

 

import android.os.Bundle;

import android.app.Activity;

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.Picture;

import android.graphics.Shader.TileMode;

import android.view.Menu;

import android.view.MotionEvent;

import android.view.View;

 

글자수제한때매 여기다가 덧붙입니다.