If you are overriding this method with your own custom content, + * consider including the standard layout {@link android.R.layout#list_content} + * in your layout file, so that you continue to retain all of the standard + * behavior of ListFragment. In particular, this is currently the only + * way to have the built-in indeterminant progress state be shown. + */ + @Override + public View onCreateView(LayoutInflater inflater, ViewGroup container, + Bundle savedInstanceState) { + final Context context = getActivity(); + + FrameLayout root = new FrameLayout(context); + + // ------------------------------------------------------------------ + + LinearLayout pframe = new LinearLayout(context); + pframe.setId(INTERNAL_PROGRESS_CONTAINER_ID); + pframe.setOrientation(LinearLayout.VERTICAL); + pframe.setVisibility(View.GONE); + pframe.setGravity(Gravity.CENTER); + + ProgressBar progress = new ProgressBar(context, null, + android.R.attr.progressBarStyleLarge); + pframe.addView(progress, new FrameLayout.LayoutParams( + ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); + + root.addView(pframe, new FrameLayout.LayoutParams( + ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); + + // ------------------------------------------------------------------ + + FrameLayout lframe = new FrameLayout(context); + lframe.setId(INTERNAL_LIST_CONTAINER_ID); + + TextView tv = new TextView(getActivity()); + tv.setId(INTERNAL_EMPTY_ID); + tv.setGravity(Gravity.CENTER); + lframe.addView(tv, new FrameLayout.LayoutParams( + ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); + + GridView lv = new GridView(getActivity()); + lv.setId(android.R.id.list); + lv.setDrawSelectorOnTop(false); + lv.setColumnWidth(convertDpToPixels(60, getActivity())); + lv.setStretchMode(GridView.STRETCH_COLUMN_WIDTH); + lv.setNumColumns(GridView.AUTO_FIT); + lv.setHorizontalSpacing(convertDpToPixels(20, getActivity())); + lv.setVerticalSpacing(convertDpToPixels(20, getActivity())); + lv.setSmoothScrollbarEnabled(true); + + // disable overscroll + if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) { + lv.setOverScrollMode(ListView.OVER_SCROLL_NEVER); + } + + lframe.addView(lv, new FrameLayout.LayoutParams( + ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); + + root.addView(lframe, new FrameLayout.LayoutParams( + ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); + + // ------------------------------------------------------------------ + + root.setLayoutParams(new FrameLayout.LayoutParams( + ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); + + return root; + } + + /** + * Attach to grid view once the view hierarchy has been created. + */ + @Override + public void onViewCreated(View view, Bundle savedInstanceState) { + super.onViewCreated(view, savedInstanceState); + ensureGrid(); + } + + /** + * Detach from {@link GridView} + */ + @Override + public void onDestroyView() { + mHandler.removeCallbacks(mRequestFocus); + mGrid = null; + mGridShown = false; + mEmptyView = mProgressContainer = mGridContainer = null; + mStandardEmptyView = null; + super.onDestroyView(); + } + + public static int convertDpToPixels(float dp, Context context){ + Resources resources = context.getResources(); + return (int) TypedValue.applyDimension( + TypedValue.COMPLEX_UNIT_DIP, + dp, + resources.getDisplayMetrics() + ); + } + + /** + * This method will be called when an item in the grid is selected. + * Subclasses should override. Subclasses can call + * getGridView().getItemAtPosition(position) if they need to access the + * data associated with the selected item. + * + * @param g The {@link GridView} where the click happened + * @param v The view that was clicked within the {@link GridView} + * @param position The position of the view in the grid + * @param id The row id of the item that was clicked + */ + public void onGridItemClick(GridView g, View v, int position, long id) { + + } + + /** + * Provide the cursor for the {@link GridView}. + */ + public void setGridAdapter(ListAdapter adapter) { + final boolean hadAdapter = (mAdapter != null); + mAdapter = adapter; + if (mGrid != null) { + mGrid.setAdapter(adapter); + if (!mGridShown && !hadAdapter) { + // The grid was hidden, and previously didn't have an + // adapter. It is now time to show it. + setGridShown(true, (getView().getWindowToken() != null)); + } + } + } + + /** + * Set the currently selected grid item to the specified + * position with the adapter's data + * + * @param position + */ + public void setSelection(int position) { + ensureGrid(); + mGrid.setSelection(position); + } + + /** + * Get the position of the currently selected grid item. + */ + public int getSelectedItemPosition() { + ensureGrid(); + return mGrid.getSelectedItemPosition(); + } + + /** + * Get the cursor row ID of the currently selected grid item. + */ + public long getSelectedItemId() { + ensureGrid(); + return mGrid.getSelectedItemId(); + } + + /** + * Get the activity's {@link GridView} widget. + */ + public GridView getGridView() { + ensureGrid(); + return mGrid; + } + + /** + * The default content for a ListFragment has a TextView that can + * be shown when the grid is empty. If you would like to have it + * shown, call this method to supply the text it should use. + */ + public void setEmptyText(CharSequence text) { + ensureGrid(); + if (mStandardEmptyView == null) { + throw new IllegalStateException("Can't be used with a custom content view"); + } + mStandardEmptyView.setText(text); + if (mEmptyText == null) { + mGrid.setEmptyView(mStandardEmptyView); + } + mEmptyText = text; + } + + /** + * Control whether the grid is being displayed. You can make it not + * displayed if you are waiting for the initial data to show in it. During + * this time an indeterminant progress indicator will be shown instead. + * + *
Applications do not normally need to use this themselves. The default + * behavior of ListFragment is to start with the grid not being shown, only + * showing it once an adapter is given with {@link #setGridAdapter(ListAdapter)}. + * If the grid at that point had not been shown, when it does get shown + * it will be do without the user ever seeing the hidden state. + * + * @param shown If true, the grid view is shown; if false, the progress + * indicator. The initial value is true. + */ + public void setGridShown(boolean shown) { + setGridShown(shown, true); + } + + /** + * Like {@link #setGridShown(boolean)}, but no animation is used when + * transitioning from the previous state. + */ + public void setGridShownNoAnimation(boolean shown) { + setGridShown(shown, false); + } + + /** + * Control whether the grid is being displayed. You can make it not + * displayed if you are waiting for the initial data to show in it. During + * this time an indeterminant progress indicator will be shown instead. + * + * @param shown If true, the grid view is shown; if false, the progress + * indicator. The initial value is true. + * @param animate If true, an animation will be used to transition to the + * new state. + */ + private void setGridShown(boolean shown, boolean animate) { + ensureGrid(); + if (mProgressContainer == null) { + throw new IllegalStateException("Can't be used with a custom content view"); + } + if (mGridShown == shown) { + return; + } + mGridShown = shown; + if (shown) { + if (animate) { + mProgressContainer.startAnimation(AnimationUtils.loadAnimation( + getActivity(), android.R.anim.fade_out)); + mGridContainer.startAnimation(AnimationUtils.loadAnimation( + getActivity(), android.R.anim.fade_in)); + } else { + mProgressContainer.clearAnimation(); + mGridContainer.clearAnimation(); + } + mProgressContainer.setVisibility(View.GONE); + mGridContainer.setVisibility(View.VISIBLE); + } else { + if (animate) { + mProgressContainer.startAnimation(AnimationUtils.loadAnimation( + getActivity(), android.R.anim.fade_in)); + mGridContainer.startAnimation(AnimationUtils.loadAnimation( + getActivity(), android.R.anim.fade_out)); + } else { + mProgressContainer.clearAnimation(); + mGridContainer.clearAnimation(); + } + mProgressContainer.setVisibility(View.VISIBLE); + mGridContainer.setVisibility(View.GONE); + } + } + + /** + * Get the ListAdapter associated with this activity's {@link GridView}. + */ + public ListAdapter getGridAdapter() { + return mAdapter; + } + + private void ensureGrid() { + if (mGrid != null) { + return; + } + View root = getView(); + if (root == null) { + throw new IllegalStateException("Content view not yet created"); + } + if (root instanceof GridView) { + mGrid = (GridView) root; + } else { + mStandardEmptyView = (TextView)root.findViewById(INTERNAL_EMPTY_ID); + if (mStandardEmptyView == null) { + mEmptyView = root.findViewById(android.R.id.empty); + } else { + mStandardEmptyView.setVisibility(View.GONE); + } + mProgressContainer = root.findViewById(INTERNAL_PROGRESS_CONTAINER_ID); + mGridContainer = root.findViewById(INTERNAL_LIST_CONTAINER_ID); + View rawGridView = root.findViewById(android.R.id.list); + if (!(rawGridView instanceof GridView)) { + if (rawGridView == null) { + throw new RuntimeException( + "Your content must have a GridView whose id attribute is " + + "'android.R.id.list'"); + } + throw new RuntimeException( + "Content has view with id attribute 'android.R.id.list' " + + "that is not a GridView class"); + } + mGrid = (GridView) rawGridView; + if (mEmptyView != null) { + mGrid.setEmptyView(mEmptyView); + } else if (mEmptyText != null) { + mStandardEmptyView.setText(mEmptyText); + mGrid.setEmptyView(mStandardEmptyView); + } + } + mGridShown = true; + mGrid.setOnItemClickListener(mOnClickListener); + if (mAdapter != null) { + ListAdapter adapter = mAdapter; + mAdapter = null; + setGridAdapter(adapter); + } else { + // We are starting without an adapter, so assume we won't + // have our data right away and start with the progress indicator. + if (mProgressContainer != null) { + setGridShown(false, false); + } + } + mHandler.post(mRequestFocus); + } +}