Java:安卓开发: "The method getHolder() is undefined for the type GameView"

Question

我一直在尝试按照此处的教程进行操作:

http://www.edu4java.com/en/androidgame/androidgame2.html

但是遇到了障碍。出于某种原因，eclipse 无法识别 getHolder() 并给我以下错误:

GameView 类型的 getHolder() 方法未定义

以及以下解决方案:

改为getHandler(...);创建方法 getHolder()

代码与教程几乎相同，但这里是我所拥有的:

package com.example.killthemall;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;

public class GameView extends View {

private Bitmap bmp;
private SurfaceHolder holder;

public GameView(Context context) {
    super(context);
    holder = getHolder();
    holder.addCallback(new Callback() {

        public void surfaceDestroyed(SurfaceHolder holder) {

        }

        public void surfaceCreated(SurfaceHolder holder) {
               Canvas c = holder.lockCanvas(null);
               onDraw(c);
               holder.unlockCanvasAndPost(c);
        }

        public void surfaceChanged(SurfaceHolder holder, int format,
                      int width, int height) {

        }

 }); 


    bmp = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
}

@Override
protected void onDraw(Canvas canvas) {
    canvas.drawColor(Color.BLACK);
    canvas.drawBitmap(bmp, 10, 10, null);
}

}

Answer 1

getHolder() 是 SurfaceView 的一种方法，您正在扩展 View。更改为:

public class GameView extends SurfaceView {