Question

我用runnable旋转图像。我希望旋转图像例如第4次然后暂停/停止旋转。我写了一些函数

public void rotateImage(final View myView, final int size) {

    runnable = new Runnable() {

        @Override
        public void run() {

            count++;
            myView.setRotation(myView.getRotation() + size);
            if (count ==3) {
                myHandler.removeCallbacks(runnable);
            }

            myHandler.postDelayed(this, 100);
            // 1000 means 1 second duration
        }
    };
    myHandler.postDelayed(runnable, 100); 

}

我可以旋转图像，但我无法停止/暂停旋转.removeCallbacks暂时不工作如果有人知道解决方案，我的代码有什么问题请帮帮我

Answer 1

我的Handler / Runnable上有相同的逻辑。它也没有停止。

我做的是：在我的活动的OnDestroy上，我打电话给

myHandler.removeCallbacksAndMessages(null);

它终于停止了。

希望它有所帮助。

Answer 2

/**
 * <p>Removes the specified Runnable from the message queue.</p>
 *
 * @param action The Runnable to remove from the message handling queue
 *
 * @return true if this view could ask the Handler to remove the Runnable,
 *         false otherwise. When the returned value is true, the Runnable
 *         may or may not have been actually removed from the message queue
 *         (for instance, if the Runnable was not in the queue already.)
 *
 * @see #post
 * @see #postDelayed
 * @see #postOnAnimation
 * @see #postOnAnimationDelayed
 */
public boolean removeCallbacks(Runnable action)

removeCallbacks（）仅在runnable在消息队列中进行挂起时才有效。你要删除的runnable显然正在运行。

你最好自己阻止它。像：

public void rotateImage(final View myView, final int size) {

runnable = new Runnable() {

    @Override
    public void run() {

        count++;
        myView.setRotation(myView.getRotation() + size);
        if (count ==3) {
            //myHandler.removeCallbacks(runnable);
        } else {
            myHandler.postDelayed(this, 100);
        }
        // 1000 means 1 second duration
    }
};
myHandler.postDelayed(runnable, 100);

}

android处理程序removeCallbacks不起作用

2 个答案: