Question

我尝试运行一个项目，到目前为止，它也没有显示我想要的项目

在我的MainActivity类中

package com.tmd.game;

import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
WindowManager.LayoutParams.FLAG_FULLSCREEN);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(new GamePanel(this));
    }
}

在我的GamePanel类中

package com.tmd.game;

import android.content.Context;
import android.graphics.Canvas;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class GamePanel extends SurfaceView implements SurfaceHolder.Callback {
private MainThread thread;

public GamePanel(Context context){
    super(context);

    thread = new MainThread(getHolder(), this);

    setFocusable(true);
}

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

}

@Override
public void surfaceCreated(SurfaceHolder holder){
    thread = new MainThread(getHolder(), this);

    thread.setRunning(true);
    thread.start();
}

@Override
public void surfaceDestroyed(SurfaceHolder holder){
    boolean retry = true;
    while(true){
        try{
            thread.setRunning(false);
            thread.join();
        }catch(Exception e) {e.printStackTrace();}
        retry = false;
    }
}
@Override
public boolean onTouchEvent(MotionEvent event){
    return super.onTouchEvent(event);
}
public void update(){

}
@Override
public void draw(Canvas canvas){
    super.draw(canvas);
}
}

在我的MainThread类中

package com.tmd.game;

import android.graphics.Canvas;
import android.view.SurfaceHolder;

public class MainThread extends Thread {
    public static final int MAX_FPS = 30;
    private double averageFPS;
    private SurfaceHolder surfaceHolder;
    private GamePanel gamePanel;
private boolean running;
public static Canvas canvas;

public void setRunning(boolean running){
    this.running = running;
}

public MainThread(SurfaceHolder surfaceHolder, GamePanel gamePanel) {
    super();
    this.surfaceHolder = surfaceHolder;
    this.gamePanel = gamePanel;
}
@Override
public void run() {
    long startTime;
    long timeMillis = 1000 / MAX_FPS;
    long waitTime;
    int frameCount = 0;
    long totalTime = 0;
    long targetTime = 1000 / MAX_FPS;

    while (running) {
        startTime = System.nanoTime();
        canvas = null;

        try {
            canvas = this.surfaceHolder.lockCanvas();
            synchronized (surfaceHolder) {
                this.gamePanel.update();
                this.gamePanel.draw(canvas);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (canvas != null) {
                try {
                    surfaceHolder.unlockCanvasAndPost(canvas);
                } catch (Exception e) { e.printStackTrace(); }
            }
        }
        timeMillis = (System.nanoTime() - startTime) / 1000000;
        waitTime = targetTime - timeMillis;
        try{
            if(waitTime > 0)
                this.sleep(waitTime);
        }catch(Exception e) {e.printStackTrace();}

        totalTime += System.nanoTime() - startTime;
        frameCount++;
        if(frameCount == MAX_FPS){
            averageFPS = 1000/((totalTime/frameCount)/1000000);
            frameCount = 0;
            totalTime = 0;
            System.out.println(averageFPS);
        }
    }
}
}

因此，当我运行此代码时，没有收到任何错误消息，但奇怪的是，我似乎无法让System.out.println（averageFPS）显示平均值。

至少对我来说这很奇怪，但是如果有人可以帮助我，我真的很合适

（对不起，如果这个问题不是“符合标准”，我是刚开始在Stack Overflow上发布问题的人）

Android Studio无法显示system.out.println

0 个答案: