public void setHeader(View header) {
mPlaceholderView.setVisibility(View.VISIBLE);
mListView
.getViewTreeObserver()
.addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mQuickReturnHeight = mQuickReturnView.getHeight();
mListView.computeScrollY();
mCachedVerticalScrollRange = mListView.getListHeight();
}
});
mListView.setOnScrollListener(
new OnScrollListener() {
@SuppressLint("NewApi")
@Override
public void onScroll(
AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
mScrollY = 0;
int translationY = 0;
if (mListView.scrollYIsComputed()) {
mScrollY = mListView.getComputedScrollY();
}
int rawY =
mPlaceholderView.getTop()
- Math.min(mCachedVerticalScrollRange - mListView.getHeight(), mScrollY);
switch (mState) {
case STATE_OFFSCREEN:
if (rawY <= mMinRawY) {
mMinRawY = rawY;
} else {
mState = STATE_RETURNING;
}
translationY = rawY;
break;
case STATE_ONSCREEN:
if (rawY < -mQuickReturnHeight) {
mState = STATE_OFFSCREEN;
mMinRawY = rawY;
}
translationY = rawY;
break;
case STATE_RETURNING:
translationY = (rawY - mMinRawY) - mQuickReturnHeight;
if (translationY > 0) {
translationY = 0;
mMinRawY = rawY - mQuickReturnHeight;
}
if (rawY > 0) {
mState = STATE_ONSCREEN;
translationY = rawY;
}
if (translationY < -mQuickReturnHeight) {
mState = STATE_OFFSCREEN;
mMinRawY = rawY;
}
break;
}
/** this can be used if the build is below honeycomb * */
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.HONEYCOMB) {
TranslateAnimation anim = new TranslateAnimation(0, 0, translationY, translationY);
anim.setFillAfter(true);
anim.setDuration(0);
mQuickReturnView.startAnimation(anim);
} else {
mQuickReturnView.setTranslationY(translationY);
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {}
});
if (header != null) {
try {
mQuickReturnView.removeAllViews();
} catch (Exception e) {
e.printStackTrace();
}
mQuickReturnView.addView(header);
}
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mQuickReturnView.setText("Default");
mListView.addHeaderView(mHeader);
// adapter o day
String[] array =
new String[] {
"Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android",
"Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android"
};
mListView.setAdapter(
new ArrayAdapter<String>(getActivity(), R.layout.list_item, R.id.text1, array));
mListView
.getViewTreeObserver()
.addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mQuickReturnHeight = mQuickReturnView.getHeight();
mListView.computeScrollY();
mCachedVerticalScrollRange = mListView.getListHeight();
}
});
mListView.setOnScrollListener(
new OnScrollListener() {
@SuppressLint("NewApi")
@Override
public void onScroll(
AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
mScrollY = 0;
int translationY = 0;
if (mListView.scrollYIsComputed()) {
mScrollY = mListView.getComputedScrollY();
}
Log.e("------", mPlaceHolder.getTop() + "");
int rawY =
mPlaceHolder.getTop()
- Math.min(mCachedVerticalScrollRange - mListView.getHeight(), mScrollY);
switch (mState) {
case STATE_OFFSCREEN:
if (rawY <= mMinRawY) {
mMinRawY = rawY;
} else {
mState = STATE_RETURNING;
}
translationY = rawY;
break;
case STATE_ONSCREEN:
if (rawY < -mQuickReturnHeight) {
mState = STATE_OFFSCREEN;
mMinRawY = rawY;
}
translationY = rawY;
break;
case STATE_RETURNING:
translationY = (rawY - mMinRawY) - mQuickReturnHeight;
if (translationY > 0) {
translationY = 0;
mMinRawY = rawY - mQuickReturnHeight;
}
if (rawY > 0) {
mState = STATE_ONSCREEN;
translationY = rawY;
}
if (translationY < -mQuickReturnHeight) {
mState = STATE_OFFSCREEN;
mMinRawY = rawY;
}
break;
}
/** this can be used if the build is below honeycomb * */
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.HONEYCOMB) {
anim = new TranslateAnimation(0, 0, translationY, translationY);
anim.setFillAfter(true);
anim.setDuration(0);
mQuickReturnView.startAnimation(anim);
} else {
mQuickReturnView.setTranslationY(translationY);
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {}
});
}
