谁能给我一个关于 Scroller 类的简单例子?据我了解,它封装了滚动,所以我需要开始计算然后手动更新必须 ScrollView 到新位置。所以我就试试
Scroller scroller = new Scroller(getApplicationContext());
scroller.startScroll(0, 0, 10, 10, 500);
for (int i = 0; i < 100; i++) {
Log.d("scroller", scroller.getCurrX()+" "+ scroller.getCurrY());
}
我所有的输出都是零。我的错误在哪里?
最佳答案
private class Flinger implements Runnable {
private final Scroller scroller;
private int lastX = 0;
Flinger() {
scroller = new Scroller(getActivity());
}
void start(int initialVelocity) {
int initialX = scrollingView.getScrollX();
int maxX = Integer.MAX_VALUE; // or some appropriate max value in your code
scroller.fling(initialX, 0, initialVelocity, 0, 0, maxX, 0, 10);
Log.i(TAG, "starting fling at " + initialX + ", velocity is " + initialVelocity + "");
lastX = initialX;
getView().post(this);
}
public void run() {
if (scroller.isFinished()) {
Log.i(TAG, "scroller is finished, done with fling");
return;
}
boolean more = scroller.computeScrollOffset();
int x = scroller.getCurrX();
int diff = lastX - x;
if (diff != 0) {
scrollingView.scrollBy(diff, 0);
lastX = x;
}
if (more) {
getView().post(this);
}
}
boolean isFlinging() {
return !scroller.isFinished();
}
void forceFinished() {
if (!scroller.isFinished()) {
scroller.forceFinished(true);
}
}
}
关于java - Android Scroller 简单示例,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11030639/