Question

我还是相当新的android，我正在尝试创建pong。

目前我正在尝试为两个图像制作动画，一个是乒乓球，第二个是划桨。现在我有这两个图像，我已经让它们动画了。球的行为就像我希望它围绕x和y轴反弹而我让桨在x轴上来回滑动但是由于某种原因，桨表现得非常奇怪。

桨由于某种原因动画不稳定，停止并随时启动。但每当我从代码中移除球动画时，桨的动作和行为就像我想要的那样

如果有人对我做错或忽视的事情有任何建议，我会全力以赴，谢谢！

package com.example.pongtest;

import java.util.Timer;
import java.util.TimerTask;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.app.Activity;

public class MainActivity extends Activity {

LinearLayout lay1;
ImageView ballImg, paddleImg;
TimerTask thisTimerTask;
Timer thisTimer;
LinearLayout.LayoutParams params;

float ballPosX=10; 
float ballPosY=10;
float paddlePosX=200;
float paddlePosY=10;
float ballOnLeftWall=0;
float ballOnRightWall=270;
float ballOnBottomWall=400;
float ballOnTopWall=0;
float paddleOnLeftWall=0;
float paddleOnRightWall=200;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    lay1 = new LinearLayout(this);
    ballImg = new ImageView(this);
    ballImg.setBackgroundResource(R.drawable.circlewdot);       
    setPosition(0,0,50,50);
    ballImg.setLayoutParams(params);

    paddleImg=new ImageView(this);
    paddleImg.setBackgroundResource(R.drawable.paddle);
    setPosition(0,0,50,10);
    paddleImg.setLayoutParams(params);

    lay1.addView(ballImg);
    lay1.addView(paddleImg);

    setContentView(lay1);

    thisTimerTask = new ThisTimerClass();
    thisTimer = new Timer(); 

    //setup frame rate of timer
    thisTimer.scheduleAtFixedRate(thisTimerTask, 2000, 16);
}

public void setPosition(float x, float y, float width, float height) {
params = new LinearLayout.LayoutParams(0,0);
params.topMargin = (int)y;
params.leftMargin = (int)x;
params.width = (int)width;
params.height = (int)height;
}

class ThisTimerClass extends TimerTask {
boolean directionOfBall_isRight = true;
boolean directionOfBall_isDown = true;
boolean directionOfPaddle_isLeft = true;

@Override
public void run() {
    // Will be called each time the timer is fired.
    MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {

        setPosition(ballPosX,ballPosY,50,50);
        ballImg.setLayoutParams(params);

        setPosition(paddlePosX,paddlePosY,50,10);
        paddleImg.setLayoutParams(params);

        //animates ball across the screen
        if (directionOfBall_isRight == true) 
        {ballPosX = (ballPosX + 1);}

        else if (directionOfBall_isRight == false) 
        {ballPosX = (ballPosX - 1);}

        if (directionOfBall_isDown == true) 
        {ballPosY = (ballPosY + 1);}

        else if (directionOfBall_isDown == false) 
        {ballPosY = (ballPosY - 1);}

        //redirects ball
        if (ballPosX > ballOnRightWall) 
        {directionOfBall_isRight = false;}

        else if (ballPosX < ballOnLeftWall) 
        {directionOfBall_isRight = true;} 

        if (ballPosY > ballOnBottomWall) 
        {directionOfBall_isDown = false;}

        else if (ballPosY < ballOnTopWall) 
        {directionOfBall_isDown = true;}

        //animates paddle across the screen
        if (directionOfPaddle_isLeft == true) 
        {paddlePosX = (paddlePosX - 1);}

        else if (directionOfPaddle_isLeft == false) 
        {paddlePosX = (paddlePosX + 1);}

        //redirects paddle
        if (paddlePosX < paddleOnLeftWall) 
        {directionOfPaddle_isLeft = false;}

        else if (paddlePosX > paddleOnRightWall) 
        {directionOfPaddle_isLeft = true;}
    }

});
}    
}
}

Answer 1

这可能是因为你在同一个线程上控制球和球拍。系统不能同时从单个线程做两件事！

我的乒乓球拍没有正常操作

1 个答案: