Code example for Fragment

Methods: getActivity, getView, onViewCreated

0
    /** 
     * Attach to list view once the view hierarchy has been created. 
     */ 
    @Override 
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        ensureList(); 
    } 
 
    /** 
     * Detach from list view. 
     */ 
    @Override 
    public void onDestroyView() { 
        mHandler.removeCallbacks(mRequestFocus);
        mAdapterView = null;
        mListShown = false;
        mEmptyView = mProgressContainer = mAdapterViewContainer = null;
        mStandardEmptyView = null;
        super.onDestroyView(); 
    } 
 
    /** 
     * This method will be called when an item in the list is selected. 
     * Subclasses should override. Subclasses can call 
     * getListView().getItemAtPosition(position) if they need to access the 
     * data associated with the selected item. 
     * 
     * @param l The ListView where the click happened 
     * @param v The view that was clicked within the ListView 
     * @param position The position of the view in the list 
     * @param id The row id of the item that was clicked 
     */ 
    public void onAdapterViewItemClick(AdapterView<?> l, View v, int position, long id) {
    } 
 
    /** 
     * Provide the cursor for the list view. 
     */ 
    public void setListAdapter(ListAdapter adapter) {
        boolean hadAdapter = mAdapter != null;
        mAdapter = adapter;
        if (mAdapterView != null) {
            mAdapterView.setAdapter(adapter);
            if (!mListShown && !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(); 
        mAdapterView.setSelection(position);
    } 
 
    /** 
     * Get the position of the currently selected list item. 
     */ 
    public int getSelectedItemPosition() { 
        ensureList(); 
        return mAdapterView.getSelectedItemPosition();
    } 
 
    /** 
     * Get the cursor row ID of the currently selected list item. 
     */ 
    public long getSelectedItemId() { 
        ensureList(); 
        return mAdapterView.getSelectedItemId();
    } 
 
    /** 
     * Get the activity's list view widget. 
     */ 
    public AdapterView getListView() { 
        ensureList(); 
        return mAdapterView;
    } 
 
    /** 
     * 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) {
            //TODO mAdapterView.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(android.widget.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 (mListShown == shown) {
            return; 
        } 
        mListShown = shown;
        if (shown) {
            if (animate) {
                mProgressContainer.startAnimation(AnimationUtils.loadAnimation(
                        getActivity(), android.R.anim.fade_out));
                mAdapterViewContainer.startAnimation(AnimationUtils.loadAnimation(
                        getActivity(), android.R.anim.fade_in));
            } else { 
                mProgressContainer.clearAnimation();
                mAdapterViewContainer.clearAnimation();
            } 
            mProgressContainer.setVisibility(View.GONE);
            mAdapterViewContainer.setVisibility(View.VISIBLE);
        } else { 
            if (animate) {
                mProgressContainer.startAnimation(AnimationUtils.loadAnimation(
                        getActivity(), android.R.anim.fade_in));
                mAdapterViewContainer.startAnimation(AnimationUtils.loadAnimation(
                        getActivity(), android.R.anim.fade_out));
            } else { 
                mProgressContainer.clearAnimation();
                mAdapterViewContainer.clearAnimation();
            } 
            mProgressContainer.setVisibility(View.VISIBLE);
            mAdapterViewContainer.setVisibility(View.GONE);
        } 
    } 
     
    /** 
     * Get the ListAdapter associated with this activity's ListView. 
     */ 
    public ListAdapter getListAdapter() {
        return mAdapter;
    } 
 
    private void ensureList() { 
        if (mAdapterView != null) {
            return; 
        } 
        View root = getView();
        if (root == null) {
            throw new IllegalStateException("Content view not yet created");
        } 
        if (root instanceof AdapterView) {
            mAdapterView = (AdapterView) root;