private void updateState(int scrollState) {
String stateName = "Undefined";
switch (scrollState) {
case RecyclerView.SCROLL_STATE_IDLE:
stateName = "Idle";
break;
case RecyclerView.SCROLL_STATE_DRAGGING:
stateName = "Dragging";
break;
case RecyclerView.SCROLL_STATE_SETTLING:
stateName = "Flinging";
break;
}
mPositionText.setText("currentPosition:" + mRecyclerView.getCurrentPosition());
mStateText.setText(stateName);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
final Activity activity = getActivity();
mToast = Toast.makeText(activity, "", Toast.LENGTH_SHORT);
mToast.setGravity(Gravity.CENTER, 0, 0);
mRecyclerView = (RecyclerViewPager) view.findViewById(R.id.list);
LinearLayoutManager layout =
new LinearLayoutManager(getActivity(), LinearLayoutManager.HORIZONTAL, false);
mRecyclerView.setLayoutManager(layout);
mRecyclerView.setAdapter(new LayoutAdapter(activity, mRecyclerView));
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLongClickable(true);
mPositionText = (TextView) view.getRootView().findViewById(R.id.position);
mCountText = (TextView) view.getRootView().findViewById(R.id.count);
mStateText = (TextView) view.getRootView().findViewById(R.id.state);
updateState(RecyclerView.SCROLL_STATE_IDLE);
mRecyclerView.setOnScrollListener(
new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int scrollState) {
updateState(scrollState);
}
@Override
public void onScrolled(RecyclerView recyclerView, int i, int i2) {
// mPositionText.setText("First: " +
// mRecyclerView.getFirstVisiblePosition());
int childCount = mRecyclerView.getChildCount();
int width = mRecyclerView.getChildAt(0).getWidth();
int padding = (mRecyclerView.getWidth() - width) / 2;
mCountText.setText("Count: " + childCount);
for (int j = 0; j < childCount; j++) {
View v = recyclerView.getChildAt(j);
// 往左 从 padding 到 -(v.getWidth()-padding) 的过程中，由大到小
float rate = 0;
;
if (v.getLeft() <= padding) {
if (v.getLeft() >= padding - v.getWidth()) {
rate = (padding - v.getLeft()) * 1f / v.getWidth();
} else {
rate = 1;
}
v.setScaleY(1 - rate * 0.1f);
} else {
// 往右 从 padding 到 recyclerView.getWidth()-padding 的过程中，由大到小
if (v.getLeft() <= recyclerView.getWidth() - padding) {
rate = (recyclerView.getWidth() - padding - v.getLeft()) * 1f / v.getWidth();
}
v.setScaleY(0.9f + rate * 0.1f);
}
}
}
});
mRecyclerView.addOnLayoutChangeListener(
new View.OnLayoutChangeListener() {
@Override
public void onLayoutChange(
View v,
int left,
int top,
int right,
int bottom,
int oldLeft,
int oldTop,
int oldRight,
int oldBottom) {
if (mRecyclerView.getChildCount() < 3) {
if (mRecyclerView.getChildAt(1) != null) {
View v1 = mRecyclerView.getChildAt(1);
v1.setScaleY(0.9f);
}
} else {
if (mRecyclerView.getChildAt(0) != null) {
View v0 = mRecyclerView.getChildAt(0);
v0.setScaleY(0.9f);
}
if (mRecyclerView.getChildAt(2) != null) {
View v2 = mRecyclerView.getChildAt(2);
v2.setScaleY(0.9f);
}
}
}
});
}