我想在每滚动50个像素后添加新的子视图，但语句scrollY = 149缺少某些值，即scrollY = 151和Log scrollY = 150但scrollY = 150丢失了。因此，代码不会为scrollY运行，也不会添加新的子视图。
虽然它适用于scrollY的大多数值，但对于public class MainActivity extends AppCompatActivity implements ScrollViewListener {
RelativeLayout parent;
TextView height;
ObservableScrollView scrollView;
int position=1;
View view1,view2;
@RequiresApi(api = Build.VERSION_CODES.M)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
parent = (RelativeLayout) findViewById(R.id.parent);
scrollView = (ObservableScrollView) findViewById(R.id.scroll_view);
LayoutInflater inflater = LayoutInflater.from(this);
view1 = inflater.inflate(R.layout.education,null, false);
view1.setId(R.id.parent+position);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.LEFT_OF,R.id.divider);
params.topMargin = 100;
params.rightMargin = 3;
parent.addView(view1, params);
position++;
final Animation leftAnimation = new TranslateAnimation(view1.getX()-50,view1.getX(),view1.getY()+100,view1.getY());
leftAnimation.setDuration(1000);
view1.setAnimation(leftAnimation);
scrollView.setOnScrollChangeListener(new View.OnScrollChangeListener() {
@Override
public void onScrollChange(View view, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
Log.d("scroll",scrollY+":"+oldScrollY);
if((scrollY-oldScrollY)>0 && scrollY%50 == 0)
{
Log.d("scroll","abcghfg");
if(position%2==0)
{
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.RIGHT_OF,R.id.divider);
// params.topMargin = (position-1)*(view1.getLayoutParams().height)+position*100;
params.topMargin = 30;
params.leftMargin = 3;
params.addRule(RelativeLayout.BELOW,parent.getChildAt(position-1).getId());
Log.d("scroll","abc");
view2 = LayoutInflater.from(MainActivity.this).inflate(R.layout.education,null,false);
view2.setId(R.id.parent+position);
Animation rightAimation = new TranslateAnimation(view2.getX()+50,view2.getX(),view2.getY()+100,view2.getY());
rightAimation.setDuration(1000);
view2.startAnimation(rightAimation);
parent.addView(view2, params);
}
else
{
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.LEFT_OF,R.id.divider);
//params.topMargin = (position-1)*(view1.getLayoutParams().height)+position*100;
params.topMargin = 30;
params.rightMargin = 3;
params.addRule(RelativeLayout.BELOW,parent.getChildAt(position-1).getId());
Log.d("scroll","def");
view2 = LayoutInflater.from(MainActivity.this).inflate(R.layout.education,null,false);
view2.setId(R.id.parent+position);
Animation animation = new TranslateAnimation(view2.getX()-50,view2.getX(),view2.getY()+100,view2.getY());
animation.setDuration(1000);
view2.startAnimation(animation);
parent.addView(view2, params);
}
position++;
}
}
});
}
}
的值很少，但事件未被触发。
我该如何解决这个问题？或者还有其他方法可以实现这一目标。
{{1}}
提前致谢。
答案 0 :(得分：0)
Android不会渲染滚动中的每个像素，因为它会对性能造成不利影响。如果滚动速度很慢，您将看到将为每个像素调用回调，但如果您快速滚动，则会在渲染触发时调用它。
在您的情况下，您需要检查自上次渲染上一个视图以来它是否渲染了50个或更多像素。