Code example for Fragment

Methods: getActivity, getView, onViewCreated

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    /** 
     * 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 grid view. 
     */ 
    @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 gv 
     *            The GridView where the click happened 
     * @param v 
     *            The view that was clicked within the 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 gv, View v, int position, long id) {
    } 
 
    /** 
     * Provide the cursor for the grid view. 
     */ 
    public void setListAdapter(ListAdapter adapter) {
        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 grid view widget. 
     */ 
    public GridView getGridView() {
        ensureGrid(); 
        return mGrid;
    } 
 
    /** 
     * The default content for a GridFragment 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 GridFragment is to start with the grid not being shown, only 
     * showing it once an adapter is given with 
     * {@link #setListAdapter(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 GridView. 
     */ 
    public ListAdapter getListAdapter() {
        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;