Java Code Examples for android.widget.ListView#getAdapter()

/**
 * 设置ListView全部显示的高度
 * @param listView 要设置的ListView
 */
public static void setListViewHeightBasedOnChildren(ListView listView) {
       //获取ListView对应的Adapter
    ListAdapter listAdapter = listView.getAdapter(); 
    if (listAdapter == null) {
        // pre-condition
        return;
    }

    int totalHeight = 0;
    for (int i = 0, len = listAdapter.getCount(); i < len; i++) {   //listAdapter.getCount()返回数据项的数目
        View listItem = listAdapter.getView(i, null, listView);
        listItem.measure(0, 0);  //计算子项View 的宽高
        totalHeight += listItem.getMeasuredHeight();  //统计所有子项的总高度
    }

    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
    //listView.getDividerHeight()获取子项间分隔符占用的高度
    //params.height最后得到整个ListView完整显示需要的高度
    listView.setLayoutParams(params);
}
 

@Override
public void onRestart() {
    super.onRestart();
    try {
        StarbuzzDatabaseHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(this);
        db = starbuzzDatabaseHelper.getReadableDatabase();
        Cursor newCursor = db.query("DRINK",
                                    new String[] { "_id", "NAME"},
                                    "FAVORITE = 1",
                                    null, null, null, null);
        ListView listFavorites = (ListView)findViewById(R.id.list_favorites);
        CursorAdapter adapter = (CursorAdapter) listFavorites.getAdapter();
        adapter.changeCursor(newCursor);
        favoritesCursor = newCursor;
    } catch(SQLiteException e) {
        Toast toast = Toast.makeText(this, "Database unavailable", Toast.LENGTH_SHORT);
        toast.show();
    }
}
 

/**
 * 使用自定义的Listview不用调用该方法
 * */
public void setListViewHeightBasedOnChildren(ListView listView) {
    // 获取ListView对应的Adapter
    ListAdapter listAdapter = listView.getAdapter();
    if (listAdapter == null) {
        return;
    }

    int totalHeight = 0;
    for (int i = 0, len = listAdapter.getCount(); i < len; i++) {
        // listAdapter.getCount()返回数据项的数目
        View listItem = listAdapter.getView(i, null, listView);
        // 计算子项View 的宽高
        listItem.measure(0, 0);
        // 统计所有子项的总高度
        totalHeight += listItem.getMeasuredHeight();
    }

    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight+ (listView.getDividerHeight() * (listAdapter.getCount() - 1));
    // listView.getDividerHeight()获取子项间分隔符占用的高度
    // params.height最后得到整个ListView完整显示需要的高度
    listView.setLayoutParams(params);
}
 

public static void setListViewHeightBasedOnChildren(ListView listView) {
    ListAdapter listAdapter = listView.getAdapter();
    if (listAdapter == null) {
        // pre-condition
        return;
    }

    int totalHeight = 0;
    for (int i = 0; i < listAdapter.getCount(); i++) {
        View listItem = listAdapter.getView(i, null, listView);
        listItem.measure(0, 0);
        totalHeight += listItem.getMeasuredHeight() + 50;
    }

    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() -1));
    listView.setLayoutParams(params);
}
 

/**** Method for Setting the Height of the ListView dynamically.
 **** Hack to fix the issue of not showing all the items of the ListView
 **** when placed inside a ScrollView  ****/
public static void setListViewHeightBasedOnChildren(ListView listView) {
    ListAdapter mAdapter = listView.getAdapter();

    int totalHeight = 0;

    for (int i = 0; i < mAdapter.getCount(); i++) {
        View mView = mAdapter.getView(i, null, listView);

        mView.measure(
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),

                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));

        totalHeight += mView.getMeasuredHeight();
        Log.w("HEIGHT" + i, String.valueOf(totalHeight));

    }

    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight
            + (listView.getDividerHeight() * (mAdapter.getCount() - 1));
    listView.setLayoutParams(params);
    listView.requestLayout();
}
 

/**
 * @author sunglasses
 * @param listView
 * @category 计算listview高度
 */
public static void setListViewHeightBasedOnChildren(ListView listView) {
	ListAdapter listAdapter = listView.getAdapter();
	if (listAdapter == null) {
		return;
	}

	int totalHeight = 0;
	for (int i = 0; i < listAdapter.getCount(); i++) {
		View listItem = listAdapter.getView(i, null, listView);
		listItem.measure(0, 0);
		totalHeight += listItem.getMeasuredHeight();
	}

	ViewGroup.LayoutParams params = listView.getLayoutParams();
	params.height = totalHeight
			+ (listView.getDividerHeight() * (listAdapter.getCount() - 1));
	listView.setLayoutParams(params);
}
 

public int setRecentUnlocksHeightBasedOnListView(ListView listView) {
    ListAdapter listAdapter = listView.getAdapter();

    if (listAdapter == null) {
        return (int) pxFromDp(550);
    } else {

        int totalHeight = listView.getPaddingTop() + listView.getPaddingBottom();
        for (int i = 0; i < listAdapter.getCount(); i++) {
            View listItem = listAdapter.getView(i, null, listView);
            if (listItem instanceof ViewGroup) {
                listItem.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
            }
            listItem.measure(0, 0);
            totalHeight += listItem.getMeasuredHeight();
        }

        totalHeight += mCardTitle.getMeasuredHeight();
        totalHeight += pxFromDp(16); // Add the paddings as well
        totalHeight += pxFromDp(48); // Add the more items button

        return totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
    }
}
 

/**
 * * Method for Setting the Height of the ListView dynamically.
 * *** Hack to fix the issue of not showing all the items of the ListView
 * *** when placed inside a ScrollView  ***
 */
public static void setListViewHeightBasedOnChildren(ListView listView) {
    ListAdapter listAdapter = listView.getAdapter();
    if (listAdapter == null)
        return;

    int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(), View.MeasureSpec.UNSPECIFIED);
    int totalHeight = 0;
    View view = null;
    for (int i = 0; i < listAdapter.getCount(); i++) {
        view = listAdapter.getView(i, view, listView);
        if (i == 0)
            view.setLayoutParams(new ViewGroup.LayoutParams(desiredWidth, ViewGroup.LayoutParams.WRAP_CONTENT));

        view.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
        totalHeight += view.getMeasuredHeight();
    }
    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
    listView.setLayoutParams(params);
    listView.requestLayout();
}
 

/**
 * 判断 ListView 是否已经滚动到底部
 *
 * @param listView 需要被判断的 ListView
 * @return
 */
public static boolean isListViewAlreadyAtBottom(ListView listView) {
    if (listView.getAdapter() == null || listView.getHeight() == 0) {
        return false;
    }

    if (listView.getLastVisiblePosition() == listView.getAdapter().getCount() - 1) {
        View lastItemView = listView.getChildAt(listView.getChildCount() - 1);
        if (lastItemView != null && lastItemView.getBottom() == listView.getHeight()) {
            return true;
        }
    }
    return false;
}
 

private void updateList() {
    ListView notesList = (ListView) findViewById(R.id.notes_list);
    CursorAdapter adapter = (CursorAdapter) notesList.getAdapter();
    String selection = DbContract.NoteEntry.COLUMN_TRASH + " = ?";
    String[] selectionArgs = { "1" };
    adapter.changeCursor(DbAccess.getCursorAllNotes(getBaseContext(), selection, selectionArgs));
}
 

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    FileSelectListAdapter adapter = (FileSelectListAdapter)l.getAdapter();
    File f = (File)adapter.getItem(position);
    if (f.isDirectory()) {
        this.setRoot(f);
    }
    else {
        Intent data = new Intent();
        data.putExtra(KEY_SELECTED_FILE_PATH, f.getAbsolutePath());
        setResult(RESULT_OK, data);
        finish();
    }
}
 

private final List<String> getSelectedReceiverIDs(final ListView listView) {
    final List<String> receiverIDs = new ArrayList<>();

    final Adapter adapter = listView.getAdapter();
    final SparseBooleanArray checkedItems = listView.getCheckedItemPositions();
    for (int i = 0; i < adapter.getCount(); i++) {
        if (checkedItems.get(i)) {
            receiverIDs.add(((Receiver) adapter.getItem(i)).id);
        }
    }

    return receiverIDs;
}
 

@Override
public void onReceive(Context context, Intent intent) {
    ListView peopleNearbyList = container.findViewById(R.id.list_people_nearby);
    if (peopleNearbyList != null) {
        ArrayAdapter<Peer> peopleNearbyAdapter = (ArrayAdapter<Peer>) peopleNearbyList.getAdapter();
        peopleNearbyAdapter.add((Peer) intent.getParcelableExtra(BluetoothManager.EXTRA_PEER));
    }
}
 

public boolean isEmpty() {
    ListView listView = getRefreshableView();
    if (listView == null) {
        return true;
    }
    ListAdapter adapter = listView.getAdapter();
    if (adapter == null) {
        return true;
    }
    return adapter.isEmpty();
}
 

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    FileListAdapter adapter = (FileListAdapter) l.getAdapter();
    if (adapter != null) {
        File file = (File) adapter.getItem(position);
        mPath = file.getAbsolutePath();
        mListener.onFileSelected(file);
    }
}
 

public static boolean setListViewHeightBasedOnItems(ListView listView) {

        DrawerItemCustomAdapter listAdapter = (DrawerItemCustomAdapter) listView.getAdapter();
        if (listAdapter != null) {

            int numberOfItems = listAdapter.getCount();

            // Get total height of all items.
            int totalItemsHeight = 0;
            for (int itemPos = 0; itemPos < numberOfItems; itemPos++) {
                View item = listAdapter.getView(itemPos, null, listView);
                item.measure(0, 0);
                totalItemsHeight += item.getMeasuredHeight();
            }

            // Get total height of all item dividers.
            int totalDividersHeight = listView.getDividerHeight() *
                    (numberOfItems - 1);

            // Set list height.
            ViewGroup.LayoutParams params = listView.getLayoutParams();
            params.height = totalItemsHeight + totalDividersHeight;
            listView.setLayoutParams(params);
            listView.requestLayout();

            return true;

        } else {
            return false;
        }

    }
 

/**
 * This method adjusts the height of the given listView to match the combined height of all if its
 * children and the dividers between list items.  This is used to set the height of the mash step
 * list such that it does not scroll, since it is encompassed by a ScrollView.
 *
 * @param listView
 *         ListView to adjust.
 */
public static void setListViewHeightBasedOnChildren(ListView listView) {
  ListAdapter listAdapter = listView.getAdapter();
  if (listAdapter == null) {
    return;
  }

  int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(), View.MeasureSpec.UNSPECIFIED);
  int totalHeight = listView.getPaddingTop() + listView.getPaddingBottom();
  View view = null;
  for (int i = 0; i < listAdapter.getCount(); i++) {
    view = listAdapter.getView(i, view, listView);

    view.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);

    if (i == 0) {
      view.setLayoutParams(new ViewGroup.LayoutParams(desiredWidth, ViewGroup.LayoutParams.WRAP_CONTENT));
      //totalHeight += view.getMeasuredHeight();
    }

    totalHeight += view.getMeasuredHeight();
  }
  ViewGroup.LayoutParams params = listView.getLayoutParams();
  params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
  listView.setLayoutParams(params);
  listView.requestLayout();
}
 

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;
}
 

@UiThread
public static int measureHeight(@NonNull ListView listView) {
    ListAdapter listAdapter = listView.getAdapter();

    if (listAdapter == null) {
        return 0;
    }

    int listItemsCount = listAdapter.getCount();

    int listItemViewsHeight = 0;

    for (int listItemViewPosition = 0; listItemViewPosition < listItemsCount; listItemViewPosition++) {
        View listItemView = listAdapter.getView(listItemViewPosition, null, listView);

        listItemViewsHeight += Views.measureHeight(listItemView);
    }

    int listDividerViewsHeight = listView.getDividerHeight() * (listItemsCount - 1);

    return listItemViewsHeight + listDividerViewsHeight;
}
 

private void navigateToFolder(FileInfo fileInfo) {
    Log.d("navigateToFolder", "BEGIN");
    if (indexBrowser.isRoot() && PathUtils.isParent(fileInfo.getPath())) {
        showAllFoldersListView(); //navigate back to folder list
    } else {
        if (fileInfo.isDirectory()) {
            indexBrowser.navigateTo(fileInfo);
            FileInfo newFileInfo=PathUtils.isParent(fileInfo.getPath())?indexBrowser.getCurrentPathInfo():fileInfo;
            if (!indexBrowser.isCacheReadyAfterALittleWait()) {
                Log.d("navigateToFolder", "load folder cache bg");
                new AsyncTask<Void, Void, Void>() {
                    @Override
                    protected void onPreExecute() {
                        updateMainProgressBar(true,"open directory: " + (indexBrowser.isRoot() ? folderBrowser.getFolderInfo(indexBrowser.getFolder()).getLabel() : indexBrowser.getCurrentPathFileName()));
                    }

                    @Override
                    protected Void doInBackground(Void... voids) {
                        indexBrowser.waitForCacheReady();
                        return null;
                    }

                    @Override
                    protected void onPostExecute(Void aVoid) {
                        Log.d("navigateToFolder", "cache ready, navigate to folder");
                        updateMainProgressBar(false,null);
                        navigateToFolder(newFileInfo);
                    }
                }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
            } else {
                List<FileInfo> list = indexBrowser.listFiles();
                Log.i("navigateToFolder", "list for path = '" + indexBrowser.getCurrentPath() + "' list = " + list.size() + " records");
                Log.d("navigateToFolder", "list for path = '" + indexBrowser.getCurrentPath() + "' list = " + list);
                checkArgument(!list.isEmpty());//list must contain at least the 'parent' path
                ListView listView = (ListView) findViewById(R.id.main_folder_and_files_list_view);
                ArrayAdapter adapter = (ArrayAdapter) listView.getAdapter();
                adapter.clear();
                adapter.addAll(list);
                adapter.notifyDataSetChanged();
                listView.setSelection(0);
                saveCurrentFolder();
                ((TextView) findViewById(R.id.main_header_folder_label)).setText(indexBrowser.isRoot()
                        ?folderBrowser.getFolderInfo(indexBrowser.getFolder()).getLabel()
                        :newFileInfo.getFileName());
            }
        } else {
            pullFile(fileInfo);
        }
    }
    Log.d("navigateToFolder", "END");
}