[英]How to animate seekbar thumb to move to a specific position
我定义了不同的锁定位置:
private static final int[] gears = new int[] { 0, 33, 66, 100 };
在onStopTrackingTouch
我计算出我的哪个锁定位置最接近我的SeekBar
的进度状态:
@Override
public void onStopTrackingTouch(final SeekBar seekBar) {
int progress = seekBar.getProgress();
int distance = Math.abs(gears[0] - progress);
int index = 0;
for(int i = 1; i < gears.length; i++) {
int tempDistance = Math.abs(gears[i] - progress);
if(tempDistance < distance) {
index = i;
distance = tempDistance;
}
}
int lock = gears[index];
}
现在,我需要使用平滑的动画以某种方式将SeekBar
的进度状态设置为我的锁定位置。
我如何实现该动画?
编辑
感谢@bwoogie的回答,这里是使用VerticalSeekBar
的完整工作示例
@Override
public void onStopTrackingTouch(final SeekBar seekBar) {
int progress = seekBar.getProgress();
int distance = Math.abs(gears[0] - progress);
int index = 0;
for(int i = 1; i < gears.length; i++) {
int tempDistance = Math.abs(gears[i] - progress);
if(tempDistance < distance) {
index = i;
distance = tempDistance;
}
}
final int lock = gears[index];
final int tick = 50;
final VerticalSeekBar verticalSeekBar = (VerticalSeekBar)seekBar;
new Thread(new Runnable() {
long now = System.currentTimeMillis();
public void run() {
while(seekBar.getProgress() != lock) {
if(now + tick < System.currentTimeMillis()) {
if(seekBar.getProgress() > lock) {
getActivity().runOnUiThread(new Runnable() {
public void run() {
verticalSeekBar.setMax(100);
verticalSeekBar.setProgressAndThumb(seekBar.getProgress() - 1);
}
});
} else if(seekBar.getProgress() < lock) {
getActivity().runOnUiThread(new Runnable() {
public void run() {
verticalSeekBar.setMax(100);
verticalSeekBar.setProgressAndThumb(seekBar.getProgress() + 1);
}
});
} else {
break;
}
now = System.currentTimeMillis();
}
}
}
}).start();
}
我要做的是创建一个循环(在新线程中),该循环每隔几毫秒检查一次是否经过了足够的时间,如果可以,那么我们可以更新seekBar。 这是基本思想,只需将其放入线程中并实现updateSeekBar()方法,因为它无法在线程中直接访问UI线程。
int newPos; // the new position we are seeking to
int ticks = 50; //how many milliseconds
long now = System.getCurrentTimeMillis();
while(seekBar.getPosition() != newPos) {
if(now + ticks < System.getCurrentTimeMillis()) {
if(seekBar.getPosition() > newPos) {
updateSeekbar(seekBar.getPosition()--);}
elseif(seekBar.getPosition() < newPos{
updateSeekbar(seekBar.getPosition()++;}
else {
break; // we've reached out goal
}
now = System.getCurrentTimeMillis(); //Edit - forgot to update the time!!
}
}
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