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標題: 關於 SurfaceView [打印本頁]

作者: wjh1208 時間: 2014-12-23 14:45
標題: 關於 SurfaceView
小弟最近在研究  遊戲製作

看到了  SurfaceView的東西,有些原理不懂,請大大賜教

有個網站  (http://blog.csdn.net/xiaominghimi/article/details/6090575)

內有教學如下:

public class MySurfaceView extends SurfaceView implements Callback, Runnable {
private SurfaceHolder sfh;
private Thread th;
private Canvas canvas;
private Paint paint;
private int ScreenW, ScreenH;
public MySurfaceView(Context context) {
      super(context);
      th = new Thread(this);
      sfh = this.getHolder();
      sfh.addCallback(this);
      paint = new Paint();
      paint.setAntiAlias(true);
      paint.setColor(Color.RED);
      this.setKeepScreenOn(true);
}
@Override
public void startAnimation(Animation animation) {
      super.startAnimation(animation);
}
public void surfaceCreated(SurfaceHolder holder) {
      ScreenW = this.getWidth();
      ScreenH = this.getHeight();
      th.start();
}
private void draw() {
      try {
         canvas = sfh.lockCanvas(); // 得到一个canvas实例
         canvas.drawColor(Color.WHITE);// 刷屏
         canvas.drawText("Himi", 100, 100, paint);// 画文字文本
         canvas.drawText("这就是简单的一个游戏框架", 100, 130, paint);
      } catch (Exception ex) {
      } finally {
         if (canvas != null)
            sfh.unlockCanvasAndPost(canvas);  // 将画好的画布提交
      }
}
public void run() {
      while (true) {
         draw();
         try {
            Thread.sleep(100);
         } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
         }
      }
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
         int height) {
}
public void surfaceDestroyed(SurfaceHolder holder) {
      // TODO Auto-generated method stub
}
}

我試著將 private void draw() 改成

  int X=100,Y=100;
Boolean test = true;
  private void draw() {
      try {
         canvas = sfh.lockCanvas(); // 得到一个canvas实例
        if(test){
                        canvas.drawColor(Color.WHITE);// 刷屏
                        canvas.drawText("Himi", X, Y, paint);// 画文字文本
                        canvas.drawText("这就是简单的一个游戏框架", X, Y+30, paint);
                          X+=30;
                  }
      } catch (Exception ex) {
      } finally {
         if (canvas != null)
            sfh.unlockCanvasAndPost(canvas);  // 将画好的画布提交
      }
}

當test  = ture時畫面就順順的文字向右移
當 test = false時在我的認知上  應該是文字停止不動
但事實上他卻會左右移動呢???
已經完全沒有執行到 canvas.drawText  為何他畫面會改變???

麻煩大大解答.....謝謝

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