ActionBarExpandableListFragment.java

package dev.dworks.libs.actionbarplus.app;

import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.ExpandableListView;
import android.widget.ExpandableListAdapter;
import android.widget.TextView;
import dev.dworks.libs.actionbarplus.ActionBarFragment;
import dev.dworks.libs.actionbarplus.R;

public class ActionBarExpandableListFragment extends ActionBarFragment {
	private ExpandableListAdapter mAdapter;
	private CharSequence mEmptyText;
	private View mEmptyView;
	final private Handler mHandler = new Handler();
	private ExpandableListView mList;
	private View mListContainer;
	private boolean mListShown;
	final private AdapterView.OnItemClickListener mOnClickListener = new AdapterView.OnItemClickListener() {
		@Override
		public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
			onListItemClick((ExpandableListView) parent, v, position, id);
		}
	};
	private View mProgressContainer;
	final private Runnable mRequestFocus = new Runnable() {
		@Override
		public void run() {
			mList.focusableViewAvailable(mList);
		}
	};
	private TextView mStandardEmptyView;
	private TextView mLoadingView;

	private void ensureList() {
		if (mList != null) {
			return;
		}
		View root = getView();
		if (root == null) {
			throw new IllegalStateException("Content view not yet created");
		}
		if (root instanceof ExpandableListView) {
			mList = (ExpandableListView) root;
		} else {
			mStandardEmptyView = (TextView) root.findViewById(R.id.internalEmpty);
			if (mStandardEmptyView == null) {
				mEmptyView = root.findViewById(android.R.id.empty);
			} else {
				mStandardEmptyView.setVisibility(View.GONE);
			}
			mProgressContainer = root.findViewById(R.id.progressContainer);
			mLoadingView = (TextView) root.findViewById(R.id.loading);
			mListContainer = root.findViewById(R.id.listContainer);
			View rawListView = root.findViewById(android.R.id.list);
			if (rawListView == null) {
				throw new RuntimeException("Your content must have a ListView whose id attribute is " + "'android.R.id.list'");
			} else {
				try {
					@SuppressWarnings("unused")
					ExpandableListView list = (ExpandableListView) rawListView;
				} catch (Exception e) {
					throw new RuntimeException("Content has view with id attribute 'android.R.id.list' " + "that is not a ListView class");
				}
			}
			mList = (ExpandableListView) rawListView;
			if (mEmptyView != null) {
				mList.setEmptyView(mEmptyView);
			} else if (mEmptyText != null) {
				mStandardEmptyView.setText(mEmptyText);
				mList.setEmptyView(mStandardEmptyView);
			}
		}
		mListShown = true;
		mList.setOnItemClickListener(mOnClickListener);
		if (mAdapter != null) {
			ExpandableListAdapter adapter = mAdapter;
			mAdapter = null;
			setListAdapter(adapter);
		} else {
			if (mProgressContainer != null) {
				setListShown(false, false);
			}
		}
		mHandler.post(mRequestFocus);
	}

	protected View getEmptyView() {
		return mEmptyView;
	}

	public ExpandableListAdapter getListAdapter() {
		return mAdapter;
	}

	public ExpandableListView getListView() {
		ensureList();
		return mList;
	}

	public long getSelectedItemId() {
		ensureList();
		return mList.getSelectedItemId();
	}

	public int getSelectedItemPosition() {
		ensureList();
		return mList.getSelectedItemPosition();
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		return inflater.inflate(R.layout.abp_list_content, container, false);
	}

	@Override
	public void onDestroyView() {
		mHandler.removeCallbacks(mRequestFocus);
		mList = null;
		mListShown = false;
		mEmptyView = mProgressContainer = mListContainer = null;
		mStandardEmptyView = null;
		super.onDestroyView();
	}

	public void onListItemClick(ExpandableListView l, View v, int position, long id) {
	}

	@Override
	public void onViewCreated(View view, Bundle savedInstanceState) {
		super.onViewCreated(view, savedInstanceState);
		ensureList();
	}

	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) {
			mList.setEmptyView(mStandardEmptyView);
		}
		mEmptyText = text;
	}

	private void setLoadingText(CharSequence text) {
		ensureList();
		if (mLoadingView == null) {
			/*
			 * throw new IllegalStateException(
			 * "Can't be used with a custom content view");
			 */
			return;
		}
		mLoadingView.setText(text);
	}

	public void setListAdapter(ExpandableListAdapter adapter) {
		boolean hadAdapter = mAdapter != null;
		mAdapter = adapter;
		if (mList != null) {
			mList.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);
			}
		}
	}

	public void setListShown(boolean shown, String loading) {
		setLoadingText(loading);
		setListShown(shown, true);
	}

	public void setListShown(boolean shown) {
		setLoadingText(getString(R.string.loading));
		setListShown(shown, true);
	}

	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));
				mListContainer.startAnimation(AnimationUtils.loadAnimation(getActivity(), android.R.anim.fade_in));
			} else {
				mProgressContainer.clearAnimation();
				mListContainer.clearAnimation();
			}
			mProgressContainer.setVisibility(View.GONE);
			mListContainer.setVisibility(View.VISIBLE);
		} else {
			if (null != mStandardEmptyView) {
				mStandardEmptyView.setText("");
			}
			if (animate) {
				mProgressContainer.startAnimation(AnimationUtils.loadAnimation(getActivity(), android.R.anim.fade_in));
				mListContainer.startAnimation(AnimationUtils.loadAnimation(getActivity(), android.R.anim.fade_out));
			} else {
				mProgressContainer.clearAnimation();
				mListContainer.clearAnimation();
			}
			mProgressContainer.setVisibility(View.VISIBLE);
			mListContainer.setVisibility(View.GONE);
		}
	}

	public void setListShownNoAnimation(boolean shown) {
		setListShown(shown, false);
	}

	public void setSelection(int position) {
		ensureList();
		mList.setSelection(position);
	}
}