Code example for ExpandableListView

Methods: setAdaptersetOnChildClickListenersetOnGroupCollapseListenersetOnGroupExpandListener, setEmptyView

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     */ 
    public void setListAdapter(ExpandableListAdapter adapter) {
        boolean hadAdapter = mAdapter != null;
        mAdapter = adapter;
        if (mExpandableList != null) {
            mExpandableList.setAdapter(adapter);
            if (!mExpandableListShown && !hadAdapter) {
                // The list was hidden, and previously didn't have an 
                // adapter. It is now time to show it. 
                setListShown(true, getView().getWindowToken() != null);
            } 
        } 
    } 
 
    /** 
     * Set the currently selected list item to the specified position with the adapter's data 
     *  
     * @param position 
     */ 
    public void setSelection(int position) {
        ensureList(); 
        mExpandableList.setSelection(position);
    } 
 
    /** 
     * Get the position of the currently selected list item. 
     */ 
    public int getSelectedItemPosition() { 
        ensureList(); 
        return mExpandableList.getSelectedItemPosition();
    } 
 
    /** 
     * Get the cursor row ID of the currently selected list item. 
     */ 
    public long getSelectedItemId() { 
        ensureList(); 
        return mExpandableList.getSelectedItemId();
    } 
 
    /** 
     * Get the activity's list view widget. 
     */ 
    public ExpandableListView getListView() {
        ensureList(); 
        return mExpandableList;
    } 
 
    /** 
     * The default content for a ListFragment has a TextView that can be shown when the list 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) {
        ensureList(); 
        if (mStandardEmptyView == null) {
            throw new IllegalStateException("Can't be used with a custom content view");
        } 
        mStandardEmptyView.setText(text);
        if (mEmptyText == null) {
            mExpandableList.setEmptyView(mStandardEmptyView);
        } 
        mEmptyText = text;
    } 
 
    /** 
     * Control whether the list 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 list not being shown, only showing it once an adapter is 
     * given with {@link #setListAdapter(ListAdapter)}. If the list 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 list view is shown; if false, the progress indicator. The initial 
     *            value is true. 
     */ 
    public void setListShown(boolean shown) {
        setListShown(shown, true);
    } 
 
    /** 
     * Like {@link #setListShown(boolean)}, but no animation is used when transitioning from the 
     * previous state. 
     */ 
    public void setListShownNoAnimation(boolean shown) {
        setListShown(shown, false);
    } 
 
    /** 
     * Control whether the list 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 list 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 setListShown(boolean shown, boolean animate) {
        ensureList(); 
        if (mProgressContainer == null) {
            throw new IllegalStateException("Can't be used with a custom content view");
        } 
        if (mExpandableListShown == shown) {
            return; 
        } 
        mExpandableListShown = shown;
        if (shown) {
            if (animate) {
                mProgressContainer.startAnimation(AnimationUtils.loadAnimation(getActivity(),
                        android.R.anim.fade_out));
                mExpandableListContainer.startAnimation(AnimationUtils.loadAnimation(getActivity(),
                        android.R.anim.fade_in));
            } else { 
                mProgressContainer.clearAnimation();
                mExpandableListContainer.clearAnimation();
            } 
            mProgressContainer.setVisibility(View.GONE);
            mExpandableListContainer.setVisibility(View.VISIBLE);
        } else { 
            if (animate) {
                mProgressContainer.startAnimation(AnimationUtils.loadAnimation(getActivity(),
                        android.R.anim.fade_in));
                mExpandableListContainer.startAnimation(AnimationUtils.loadAnimation(getActivity(),
                        android.R.anim.fade_out));
            } else { 
                mProgressContainer.clearAnimation();
                mExpandableListContainer.clearAnimation();
            } 
            mProgressContainer.setVisibility(View.VISIBLE);
            mExpandableListContainer.setVisibility(View.GONE);
        } 
    } 
 
    /** 
     * Get the ListAdapter associated with this activity's ListView. 
     */ 
    public ExpandableListAdapter getListAdapter() {
        return mAdapter;
    } 
 
    private void ensureList() { 
        if (mExpandableList != null) {
            return; 
        } 
        View root = getView();
        if (root == null) {
            throw new IllegalStateException("Content view not yet created");
        } 
        if (root instanceof ExpandableListView) {
            mExpandableList = (ExpandableListView) 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);
            mExpandableListContainer = root.findViewById(INTERNAL_LIST_CONTAINER_ID);
            View rawExpandableListView = root.findViewById(android.R.id.list);
            if (!(rawExpandableListView instanceof ExpandableListView)) {
                if (rawExpandableListView == null) {
                    throw new RuntimeException(
                            "Your content must have a ListView 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 ListView class"); 
            } 
            mExpandableList = (ExpandableListView) rawExpandableListView;
            if (mEmptyView != null) {
                mExpandableList.setEmptyView(mEmptyView);
            } else if (mEmptyText != null) {
                mStandardEmptyView.setText(mEmptyText);
                mExpandableList.setEmptyView(mStandardEmptyView);
            } 
        } 
        mExpandableListShown = true;
        mExpandableList.setOnItemClickListener(mOnClickListener);
        if (mAdapter != null) {
            ExpandableListAdapter adapter = mAdapter;
            mAdapter = null;
            setListAdapter(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) {
                setListShown(false, false); 
            } 
        } 
        mHandler.post(mRequestFocus);
    } 
 
    /** 
     * Override this to populate the context menu when an item is long pressed. menuInfo will 
     * contain an {@link android.widget.ExpandableListView.ExpandableListContextMenuInfo} whose 
     * packedPosition is a packed position that should be used with 
     * {@link ExpandableListView#getPackedPositionType(long)} and the other similar methods. 
     * <p> 
     * {@inheritDoc} 
     */ 
    @Override 
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
    } 
 
    /** 
     * Override this for receiving callbacks when a child has been clicked. 
     * <p> 
     * {@inheritDoc} 
     */ 
    public boolean onChildClick(ExpandableListView parent, View v, int groupPosition,
            int childPosition, long id) {
        return false; 
    } 
 
    /** 
     * Override this for receiving callbacks when a group has been collapsed. 
     */ 
    public void onGroupCollapse(int groupPosition) {
    } 
 
    /** 
     * Override this for receiving callbacks when a group has been expanded. 
     */ 
    public void onGroupExpand(int groupPosition) {
    } 
 
    // /** 
    // * Ensures the expandable list view has been created before Activity restores all 
    // * of the view states. 
    // * 
    // *@see Activity#onRestoreInstanceState(Bundle) 
    // */ 
    // @Override 
    // protected void onRestoreInstanceState(Bundle state) { 
    // ensureList(); 
    // super.onRestoreInstanceState(state); 
    // } 
 
    /** 
     * Updates the screen state (current list and other views) when the content changes. 
     *  
     * @see Activity#onContentChanged() 
     */ 
 
    public void onContentChanged() { 
        // super.onContentChanged(); 
        View emptyView = getView().findViewById(android.R.id.empty);
        mExpandableList = (ExpandableListView) getView().findViewById(android.R.id.list);
        if (mExpandableList == null) {
            throw new RuntimeException(
                    "Your content must have a ExpandableListView whose id attribute is " 
                            + "'android.R.id.list'"); 
        } 
        if (emptyView != null) {
            mExpandableList.setEmptyView(emptyView);
        } 
        mExpandableList.setOnChildClickListener(this);
        mExpandableList.setOnGroupExpandListener(this);
        mExpandableList.setOnGroupCollapseListener(this);
 
        if (mFinishedStart) {
            setListAdapter(mAdapter);
        } 
        mFinishedStart = true;