无缝背景作为自定义视图组件，onDraw 不会被 invalidate() 调用

Question

朋友们，

我想制作一个无缝背景作为自定义视图组件。

我在调试过程中发现的问题是，

第一次在线程中调用 invalidate() 时，我的 onDraw 回调方法被调用。 其他时候，我的线程调用 invalidate() 时，不会调用 onDraw 回调方法。

所以它只是运行 invalidate() 方法，就像它根本不存在一样。

该应用程序显示无缝背景 png。但作为静态。它没有得到更新。

我发布了所有代码，因为错误可能位于线程之外，其中 invalidate() 位于或位于 onDraw 方法之外。

感谢任何形式的帮助！所以谢谢

              public class MyBringBackSurface extends View implements Runnable {

Bitmap bitmapResource;
int leftFrameX, rightFrameX, startX, stopX, bitmapPixelWidth,
        bitmapPixelHight;
int pixelPerFrame = 10;
int framerate = 100;
int threadSleepTime;
int offsetYInPixel = 200;
Thread ourthread = null;
boolean isrunning = false;

Canvas c;

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

    init();

}

public MyBringBackSurface(Context context, AttributeSet attrs) {
    super(context, attrs);

    init();

}

public MyBringBackSurface(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);

    init();

}

private void init() {


    // Set up Bitmap Resource

    bitmapResource = BitmapFactory.decodeResource(getResources(),
                    R.drawable.simelessbackground);


 //  c = new Canvas(bitmapResource);


    // Implementing leftFrameX and rightFrameX
    leftFrameX = 0;
    rightFrameX = bitmapResource.getWidth();

    // Calculating the Thread sleep time
    threadSleepTime = 1000 / framerate;



}

public void pause() { // destroy the currently running thread because
                        // anyways in the on resume will be created a
                        // new one again

    isrunning = false;
    while (true) {

        try { // goes through this thread until our thread died
            ourthread.join(); // Blocks the current Thread
                                // (Thread.currentThread()) until the
                                // receiver finishes its execution and
                                // dies.
        } catch (InterruptedException e) {

            e.printStackTrace();
        }
        break;
    }


}

public void resume() {

    isrunning = true;
    ourthread = new Thread(this);

    ourthread.start();

}

public void run() {

    while (isrunning) {

        try {
            Thread.sleep(threadSleepTime);
            // formula is 1000/ sleep time (here 5) = frame rate
        } catch (InterruptedException e) {

            e.printStackTrace();
        }

        invalidate();

        // Add pixelPerFrame and draw again
        leftFrameX = leftFrameX - pixelPerFrame;
        rightFrameX = rightFrameX - pixelPerFrame;

        // if picture is completely out of the screen, start over again
        if (leftFrameX <= -bitmapResource.getWidth()) {
            leftFrameX = 0;
            rightFrameX = bitmapResource.getWidth();
        }
    }
}

/**
 * Render the text
 * 
 * @see android.view.View#onDraw(android.graphics.Canvas)
 */
@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);


    canvas.drawRGB(255, 255, 255);

    // Draw Rectangle 1250 pixel
    Rect rect1000 = new Rect();
    rect1000.set(0, 0, 1250, 20);
    Paint blue = new Paint();
    blue.setColor(Color.BLUE);
    canvas.drawRect(rect1000, blue);

    // Draw first Bitmap
    Rect rectBitmapSource = new Rect(0, 0, bitmapResource.getWidth(),
            bitmapResource.getHeight());
    Rect rectBitmapDestinationFirst = new Rect(leftFrameX, offsetYInPixel,
            rightFrameX, offsetYInPixel + bitmapResource.getHeight());
    canvas.drawBitmap(bitmapResource, rectBitmapSource,
            rectBitmapDestinationFirst, null);

    // Draw second Bitmap

    Rect rectBitmapDestinationSecond = new Rect(
            (leftFrameX + bitmapResource.getWidth()), offsetYInPixel,
            (rightFrameX + bitmapResource.getWidth()), offsetYInPixel
                    + bitmapResource.getHeight());
    canvas.drawBitmap(bitmapResource, rectBitmapSource,
            rectBitmapDestinationSecond, null);



}

}

Answer 1

我在浏览了谷歌文档后找到了答案。

如果你想从 UI 线程外部使视图失效，你必须使用
postinvalidate() 命令而不是 invalidate()。

就是这样。它会像魅力一样发挥作用！