Question

我想在Android中做一个简单的动画。我按照本教程系列来设置基本的java代码：

https://www.youtube.com/watch?v=UH2OWnq7NQ4

为了能够控制帧速率，我添加了行thread.sleep(500);。但是，这条线用红色加下划线，如果我在它上方悬停，它会说：

Unhandled exception: java.lang.interruptedException

我做错了什么？谢谢！

public class AnimationActivity extends SurfaceView implements Runnable {

    Thread thread = null;
    boolean canDraw = false;

    Bitmap backgroundBlack;
    Canvas canvas;
    SurfaceHolder surfaceHolder;

    public AnimationActivity(Context context) {
        super(context);
        surfaceHolder = getHolder();
        backgroundBlack = BitmapFactory.decodeResource(getResources(), R.drawable.background_black);

    }

    @Override
    public void run() {
        while (canDraw) {
            if (!surfaceHolder.getSurface().isValid()) {
                continue;
            }

            canvas = surfaceHolder.lockCanvas();
            canvas.drawBitmap(backgroundBlack,0,0, null);

            //drawing stuff here

            surfaceHolder.unlockCanvasAndPost(canvas);

            thread.sleep(500)
        }
    }

    public void pause() {
        canDraw = false;

        while (true) {
            try {
                thread.join();
                break;
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        thread = null;
    }

    public void resume() {
        canDraw = true;
        thread = new Thread(this);
        thread.start();
    }
}

Answer 1

它不是“不工作” - 但它可能抛出一个InterruptedException，你要么必须声明要抛出（在方法签名中抛出InterruptedException），要么你应该抓住它：

try {
    Thread.sleep(500);
} catch (InterruptedException e) {
    e.printStackTrace();
}

PS：sleep是一个静态方法，应该以静态方式调用：Thread.sleep而不是thread.sleep

thread.sleep（long millis）在Android中不起作用

1 个答案: