一个更简单、更清晰的解决方案是只使用在Android SDK 11中被引入的标准ObjectAnimator
。
淡入效果实现只需要一行代码:
ObjectAnimator.ofFloat(marker, "alpha", 0f, 1f).setDuration(500).start();
Animator animator = ObjectAnimator.ofFloat(marker, "alpha", 1f, 0f);
animator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationEnd(Animator animator) {
marker.remove();
}
@Override public void onAnimationStart(Animator animator) {}
@Override public void onAnimationCancel(Animator animator) {}
@Override public void onAnimationRepeat(Animator animator) {}
});
animator.setDuration(500).start();
Handler
发布一些 Runnable
来与 Marker.setAlpha
结合使用。setAlpha
而不是 setPosition
,就可以轻松完成。使用此代码进行淡入淡出
map.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 15));
map.animateCamera(CameraUpdateFactory.zoomTo(15), 2000, null);
这里是一个更完整的解决方案,专门针对添加标记时的淡入效果。需要注意的是requestNumber。如果您在移动地图时加载项目,则此功能非常有用。只需在每个服务调用中递增它,或者如果不需要它,则将其删除。
public void fadeInMarker(Activity activity,final GoogleMap map, final MarkerOptions markerOptions, final long duration,final int requestNumber){
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
if (currentRequestNumber != requestNumber){
return;
}
markerOptions.alpha(0);
final Marker marker = map.addMarker(markerOptions);
final AccelerateInterpolator accelartor = new AccelerateInterpolator();
final Long startTime = SystemClock.uptimeMillis();
final Handler handler = new Handler();
handler.post(new Runnable() {
@Override
public void run() {
float diff = SystemClock.uptimeMillis() - startTime;
float alpha = accelartor.getInterpolation(diff / duration);
if (alpha < 1) {
handler.postDelayed(this, 10);
}
else{
alpha = 1;
}
if (currentRequestNumber == requestNumber){
marker.setAlpha(alpha);
}
}
});
}
});
}