Code example for Fragment

Methods: getActivity, getView, onViewCreated

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     */ 
    @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(); 
    } 
 
    /** 
     * 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 l 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. 
     *  
     * <p>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);