Java Code Examples for android.widget.listview#setSelectionFromTop()

@Override
public void onLoadFinished(@NonNull final Loader<Cursor> loader, final Cursor data) {
	// Here we have to restore the old saved scroll position, or scroll to the bottom if before adding new events it was scrolled to the bottom.  
	final ListView list = getListView();
	final int position = logScrollPosition;
	final boolean scrolledToBottom = position == LOG_SCROLLED_TO_BOTTOM || (list.getCount() > 0 && list.getLastVisiblePosition() == list.getCount() - 1);

	logAdapter.swapCursor(data);

	if (position > LOG_SCROLL_NULL) {
		list.setSelectionFromTop(position, 0);
	} else {
		if (scrolledToBottom)
			list.setSelection(list.getCount() - 1);
	}
	logScrollPosition = LOG_SCROLL_NULL;
}
 

@Override
public void scrollTargetBy(int deltaX, int deltaY) {
    final ListView target = mTarget;
    final int firstPosition = target.getFirstVisiblePosition();
    if (firstPosition == ListView.INVALID_POSITION) {
        return;
    }

    final View firstView = target.getChildAt(0);
    if (firstView == null) {
        return;
    }

    final int newTop = firstView.getTop() - deltaY;
    target.setSelectionFromTop(firstPosition, newTop);
}
 

@Override
public void scrollTargetBy(int deltaX, int deltaY) {
    final ListView target = mTarget;
    final int firstPosition = target.getFirstVisiblePosition();
    if (firstPosition == ListView.INVALID_POSITION) {
        return;
    }

    final View firstView = target.getChildAt(0);
    if (firstView == null) {
        return;
    }

    final int newTop = firstView.getTop() - deltaY;
    target.setSelectionFromTop(firstPosition, newTop);
}
 

@Override
public void scrollTargetBy(int deltaX, int deltaY) {
    final ListView target = mTarget;
    final int firstPosition = target.getFirstVisiblePosition();
    if (firstPosition == ListView.INVALID_POSITION) {
        return;
    }

    final View firstView = target.getChildAt(0);
    if (firstView == null) {
        return;
    }

    final int newTop = firstView.getTop() - deltaY;
    target.setSelectionFromTop(firstPosition, newTop);
}
 

public T smoothScrollTo(final int position) {
    if (view instanceof ListView) {
        final ListView listView = (ListView) view;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            listView.smoothScrollToPositionFromTop(position, 0);
            listView.postDelayed(new Runnable() {
                @Override
                public void run() {
                    // Mock touchEvent to stop listView Scrolling.
                    listView.onTouchEvent(MotionEvent.obtain(System.currentTimeMillis(),
                            System.currentTimeMillis(), MotionEvent.ACTION_DOWN, 0, 0, 0));
                }
            }, 150 - 20);

            listView.postDelayed(new Runnable() {
                @Override
                public void run() {
                    listView.setSelectionFromTop(position, 0);
                }
            }, 150);
        } else {
            listView.setSelectionFromTop(position, 0);
        }
    }
    return self();
}
 

@Override
public void scrollTargetBy(int deltaX, int deltaY) {
    final ListView target = mTarget;
    final int firstPosition = target.getFirstVisiblePosition();
    if (firstPosition == ListView.INVALID_POSITION) {
        return;
    }

    final View firstView = target.getChildAt(0);
    if (firstView == null) {
        return;
    }

    final int newTop = firstView.getTop() - deltaY;
    target.setSelectionFromTop(firstPosition, newTop);
}
 

@Override
public void onActivityCreated(Bundle savedInstanceState) {
	super.onActivityCreated(savedInstanceState);
	
	if (getView() != null && savedInstanceState != null) {
		final ListView commitList = (ListView) getView().findViewById(R.id.git_history_commit_list);

		if (commitList != null) {
			commitList.setSelectionFromTop(savedInstanceState.getInt("listIndex", 0), savedInstanceState.getInt("listTop", 0));
			
			selectItem(savedInstanceState.getInt("selectedItem", -1));
		}
	}
}
 

/**
 * listview滚动到顶部
 *
 * @param animate 是否动画
 * @return
 */
public UDBaseListOrRecyclerView scrollToTop( int offset,  boolean animate) {
     ListView lv = getListView();
    if (lv != null) {
        if (animate) {
            if (lv.getFirstVisiblePosition() > 7) {//hack fast scroll
                lv.setSelection(7);
            }
            lv.smoothScrollToPositionFromTop(0, offset);
        } else {
            lv.setSelectionFromTop(0, offset);
        }
    }
    return this;
}
 

private void applyToListView (final ListView lv) {
	// NOTE if this seems unreliable try wrapping setSelection*() calls in lv.post(...).
	final ListAdapter adapter = lv.getAdapter();

	if (this.itemId >= 0L) {
		for (int i = 0; i < adapter.getCount(); i++) {
			if (adapter.getItemId(i) == this.itemId) {
				lv.setSelectionFromTop(i, this.top);
				return;
			}
		}
	}

	// Also search by time before giving up.
	if (this.itemTime > 0L && adapter instanceof TweetListCursorAdapter) {
		final TweetListCursorAdapter tlca = (TweetListCursorAdapter) adapter;
		for (int i = 0; i < tlca.getCount(); i++) {
			final long itime = tlca.getItemTime(i);
			if (itime > 0L && itime <= this.itemTime) {
				lv.setSelectionFromTop(i, 0);
				return;
			}
		}
		LOG.w("Failed to restore scroll state %s to list of %s items.", this, tlca.getCount());
	}
	else {
		LOG.w("Failed to restore scroll state %s.", this);
	}

	lv.setSelection(lv.getCount() - 1);
}
 

public boolean refresh() {
	if (ListUtil.isEmpty(newInboxList) && ListUtil.isEmpty(newOutboxList)) {
		return false;
	}

	addCacheToFirst(newInboxList);
	addCacheToFirst(newOutboxList);
	int offset = newInboxList.size() + newOutboxList.size();
	newInboxList.clear();
	newOutboxList.clear();
	newCount = 0;

	ListView lvMicroBlog = (ListView)((Activity)context).findViewById(R.id.lvMicroBlog);
	if (lvMicroBlog == null) {
		return true;
	}
	Adapter adapter = lvMicroBlog.getAdapter();
	if (adapter instanceof HeaderViewListAdapter) {
		adapter = ((HeaderViewListAdapter)adapter).getWrappedAdapter();
	}
	if (lvMicroBlog != null 
		&& adapter == this) {
		int position = lvMicroBlog.getFirstVisiblePosition();
		View view = lvMicroBlog.getChildAt(0);
		int y = 0;
		if (view != null && position >= 1) {
		    y = view.getTop();
		    position += offset;
		    lvMicroBlog.setSelectionFromTop(position, y);
		}
	}

	return true;
}
 

public boolean refresh() {
	if (listNewBlogs == null || listNewBlogs.size() == 0) {
		return false;
	}

	addCacheToFirst(listNewBlogs);
	int offset = listNewBlogs.size();
	listNewBlogs.clear();

	ListView lvMicroBlog = (ListView)((Activity)context).findViewById(R.id.lvMicroBlog);
	if (lvMicroBlog == null) {
		return true;
	}
	Adapter adapter = lvMicroBlog.getAdapter();
	if (adapter instanceof HeaderViewListAdapter) {
		adapter = ((HeaderViewListAdapter)adapter).getWrappedAdapter();
	}
	if (adapter == this) {
		int position = lvMicroBlog.getFirstVisiblePosition();
		View view = lvMicroBlog.getChildAt(0);
		int y = 0;
		if (view != null && position >= 1) {
		    y = view.getTop();
		    //System.out.println("y:" + y + " position:" + position);
		    position += offset;
		    lvMicroBlog.setSelectionFromTop(position, y);
		}
	}

	return true;
}
 

public boolean refresh() {
	if (ListUtil.isEmpty(listNewComments)) {
		return false;
	}

	addCacheToFirst(listNewComments);
	int offset = listNewComments.size();
	listNewComments.clear();
	newCount = 0;

	ListView lvMicroBlog = (ListView)((Activity)context).findViewById(R.id.lvMicroBlog);
	if (lvMicroBlog == null) {
		return true;
	}
	Adapter adapter = lvMicroBlog.getAdapter();
	if (adapter instanceof HeaderViewListAdapter) {
		adapter = ((HeaderViewListAdapter)adapter).getWrappedAdapter();
	}
	if (lvMicroBlog != null &&
		adapter == this
	) {
		int position = lvMicroBlog.getFirstVisiblePosition();
		View view = lvMicroBlog.getChildAt(0);
		int y = 0;
		if (view != null && position >= 1) {
		    y = view.getTop();
		    position += offset;
		    lvMicroBlog.setSelectionFromTop(position, y);
		}
	}

	return true;
}
 

public boolean refresh() {
	if (listNewBlogs == null || listNewBlogs.size() == 0) {
		return false;
	}

	addCacheToFirst(listNewBlogs);
	int offset = listNewBlogs.size();
	listNewBlogs.clear();
	newCount = 0;

	ListView lvMicroBlog = (ListView)((Activity)context).findViewById(R.id.lvMicroBlog);
	if (lvMicroBlog == null) {
		return true;
	}
	Adapter adapter = lvMicroBlog.getAdapter();
	if (adapter instanceof HeaderViewListAdapter) {
		adapter = ((HeaderViewListAdapter)adapter).getWrappedAdapter();
	}
	if (lvMicroBlog != null &&
		adapter == this
	) {
		int position = lvMicroBlog.getFirstVisiblePosition();
		View view = lvMicroBlog.getChildAt(0);
		int y = 0;
		if (view != null && position >= 1) {
		    y = view.getTop();
		    position += offset;
		    lvMicroBlog.setSelectionFromTop(position, y);
		}
	}

	return true;
}
 

public static void setSelection(final ListView listView, int pos, boolean jumpToBottom) {
	if (jumpToBottom) {
		final View lastChild = listView.getChildAt(listView.getChildCount() - 1);
		if (lastChild != null) {
			listView.setSelectionFromTop(pos, -lastChild.getHeight());
			return;
		}
	}
	listView.setSelection(pos);
}
 

public void apply(final ListView listView) {
	if (listView.getHeight() == 0) {
		listView.post(() -> listView.setSelectionFromTop(position, y));
	} else {
		listView.setSelectionFromTop(position, y);
	}
}
 

public static void setSelection(final ListView listView, int pos, boolean jumpToBottom) {
    if (jumpToBottom) {
        final View lastChild = listView.getChildAt(listView.getChildCount() - 1);
        if (lastChild != null) {
            listView.setSelectionFromTop(pos, -lastChild.getHeight());
            return;
        }
    }
    listView.setSelection(pos);
}
 

/**
 * listview滚动到某个位置
 *
 * @param section
 * @param rowInSection
 * @param offset
 * @return
 */
public UDBaseListOrRecyclerView scrollToItem( int section,  int rowInSection,  int offset,  boolean animate) {
     ListView lv = getListView();
    if (lv != null) {
        if (animate) {
            lv.smoothScrollToPositionFromTop(getPositionBySectionAndRow(section, rowInSection), offset);
        } else {
            lv.setSelectionFromTop(getPositionBySectionAndRow(section, rowInSection), offset);
        }
    }
    return this;
}
 

@Override
protected void onResume() {
	super.onResume();
       SharedPreferences prefs = getSharedPreferences("PrettyGoodMusicPlayer", MODE_PRIVATE);
       prefs.edit();
       File bestGuessMusicDir = Utils.getBestGuessMusicDirectory();
       String prefDir = prefs.getString("ARTIST_DIRECTORY", bestGuessMusicDir.getAbsolutePath());
       ListView lv = (ListView) findViewById(R.id.artistListView);
       if(!prefDir.equals(baseDir)){
       	baseDir = prefDir;
       	populateArtists(baseDir);
           
           simpleAdpt = new SimpleAdapter(this, artists,  R.layout.pgmp_list_item, new String[] {"artist"}, new int[] {R.id.PGMPListItemText});
           lv.setAdapter(simpleAdpt);
       }
       
       int top = prefs.getInt("ARTIST_LIST_TOP", Integer.MIN_VALUE);
       int index = prefs.getInt("ARTIST_LIST_INDEX", Integer.MIN_VALUE);
       if(top > Integer.MIN_VALUE && index > Integer.MIN_VALUE){
       	Log.i(TAG, "Setting position from saved preferences");
       	lv.setSelectionFromTop(index, top);
       } else {
       	Log.i(TAG, "No saved position found");
       }

       SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
       String theme = sharedPref.getString("pref_theme", getString(R.string.light));
       String size = sharedPref.getString("pref_text_size", getString(R.string.medium));
       Log.i(TAG, "got configured theme " + theme);
       Log.i(TAG, "Got configured size " + size);
       if(currentTheme == null){
       	currentTheme = theme;
       } 
       
       if(currentSize == null){
       	currentSize = size;
       }
       if(!currentTheme.equals(theme) || !currentSize.equals(size)) {
		finish();
		startActivity(getIntent());
	}
}
 

void setFilteredTasks(boolean reload) {
	if (reload) {
		try {
			taskBag.reload();
		} catch (Exception e) {
			Log.e(TAG, e.getMessage(), e);
		}
	}

	if (mScrollPosition < 0) {
		calculateScrollPosition();
	}

	m_adapter.clear();
	for (Task task : taskBag.getTasks(FilterFactory.generateAndFilter(
			m_app.m_prios, m_app.m_contexts, m_app.m_projects,
			m_app.m_search, false), m_app.sort.getComparator())) {
		m_adapter.add(task);
	}

	ListView lv = getListView();
	lv.setSelectionFromTop(mScrollPosition, mScrollTop);

	final TextView filterText = (TextView) findViewById(R.id.filter_text);
	final LinearLayout actionbar = (LinearLayout) findViewById(R.id.actionbar);
	final ImageView actionbar_icon = (ImageView) findViewById(R.id.actionbar_icon);

	if (filterText != null) {
		if (m_app.m_filters.size() > 0) {
			String filterTitle = getString(R.string.title_filter_applied)
					+ " ";
			int count = m_app.m_filters.size();

			for (int i = 0; i < count; i++) {
				filterTitle += m_app.m_filters.get(i) + " ";
			}

			if (!Strings.isEmptyOrNull(m_app.m_search)) {
				filterTitle += getString(R.string.filter_tab_search);
			}

			actionbar_icon.setImageResource(R.drawable.ic_actionbar_filter);

			actionbar.setVisibility(View.VISIBLE);
			filterText.setText(filterTitle);
		} else if (!Strings.isEmptyOrNull(m_app.m_search)) {
			if (filterText != null) {
				actionbar_icon
						.setImageResource(R.drawable.ic_actionbar_search);
				filterText.setText(getString(R.string.title_search_results)
						+ " " + m_app.m_search);

				actionbar.setVisibility(View.VISIBLE);
			}
		} else {
			filterText.setText("");
			actionbar.setVisibility(View.GONE);
		}
	}

	m_swipeList.setEnabled(!inActionMode());
}
 

public static boolean scrollCompat(View view, float deltaY) {
    if (view != null) {
        if (view instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) view;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                absListView.scrollListBy((int) deltaY);
            } else if (absListView instanceof ListView) {
                // {@link android.support.v4.widget.ListViewCompat#scrollListBy(ListView,
                // int)}
                final ListView listView = (ListView) absListView;
                final int firstPosition = listView.getFirstVisiblePosition();
                if (firstPosition == ListView.INVALID_POSITION) {
                    return false;
                }
                final View firstView = listView.getChildAt(0);
                if (firstView == null) {
                    return false;
                }
                final int newTop = (int) (firstView.getTop() - deltaY);
                listView.setSelectionFromTop(firstPosition, newTop);
            } else {
                absListView.smoothScrollBy((int) deltaY, 0);
            }
            return true;
        } else if (view instanceof WebView
                || view instanceof ScrollView
                || view instanceof NestedScrollView) {
            view.scrollBy(0, (int) deltaY);
            return true;
        } else if (ViewCatcherUtil.isRecyclerView(view)) {
            RecyclerView recyclerView = (RecyclerView) view;
            if (!(recyclerView.getOnFlingListener() instanceof PagerSnapHelper)) {
                // Fix the problem of adding new data to RecyclerView while in Fling state,
                // the new items will continue to Fling
                if (recyclerView.getScrollState() == RecyclerView.SCROLL_STATE_SETTLING) {
                    recyclerView.stopScroll();
                }
                view.scrollBy(0, (int) deltaY);
            }
            return true;
        }
    }
    return false;
}