如何确保进度条已停止

Question

我知道要“停止” ProgressBar，需要将其可见性设置为View.GONE。但是……这真的能阻止它吗？背景中有一个动画可以为视图设置动画。一旦检测到进度条是GONE 或INVISIBILE，该动画是否会停止？我真的不希望在不需要时在后台连续运行进度条。这是对处理能力的浪费。

有人知道吗？

Answer 1

看着ProgressBar.java我发现：

/**
 * Returns whether the ProgressBar is animating or not. This is essentially the same
 * as whether the ProgressBar is {@link #isIndeterminate() indeterminate} and visible,
 * as indeterminate ProgressBars are always animating, and non-indeterminate
 * ProgressBars are not animating.
 *
 * @return true if the ProgressBar is animating, false otherwise.
 */
public boolean isAnimating() {
    return isIndeterminate() && getWindowVisibility() == VISIBLE && isShown();
}

void startAnimation() {
    if (getVisibility() != VISIBLE || getWindowVisibility() != VISIBLE) {
        return;
    }
    ...


@Override
protected void onDetachedFromWindow() {
    if (mIndeterminate) {
        stopAnimation();
    }
    ...

我认为，ProgressBar 隐藏后会停止动画。