ListFragment.java

package com.WazaBe.HoloEverywhere.app;

import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.FrameLayout;
import android.widget.ListAdapter;
import android.widget.ListView;

import com.WazaBe.HoloEverywhere.LayoutInflater;
import com.WazaBe.HoloEverywhere.widget.LinearLayout;
import com.WazaBe.HoloEverywhere.widget.ProgressBar;
import com.WazaBe.HoloEverywhere.widget.TextView;

public class ListFragment extends Fragment {
	static final int INTERNAL_EMPTY_ID = 0x00ff0001;
	static final int INTERNAL_LIST_CONTAINER_ID = 0x00ff0003;
	static final int INTERNAL_PROGRESS_CONTAINER_ID = 0x00ff0002;

	private ListAdapter mAdapter;

	private CharSequence mEmptyText;

	private View mEmptyView;

	final private Handler mHandler = new Handler();
	private ListView 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((ListView) parent, v, position, id);
		}
	};
	private View mProgressContainer;
	final private Runnable mRequestFocus = new Runnable() {
		@Override
		public void run() {
			mList.focusableViewAvailable(mList);
		}
	};
	private TextView mStandardEmptyView;

	private void ensureList() {
		if (mList != null) {
			return;
		}
		View root = getView();
		if (root == null) {
			throw new IllegalStateException("Content view not yet created");
		}
		if (root instanceof ListView) {
			mList = (ListView) 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);
			mListContainer = root.findViewById(INTERNAL_LIST_CONTAINER_ID);
			View rawListView = root.findViewById(android.R.id.list);
			if (!(rawListView instanceof ListView)) {
				if (rawListView == 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");
			}
			mList = (ListView) 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) {
			ListAdapter adapter = mAdapter;
			mAdapter = null;
			setListAdapter(adapter);
		} else {
			if (mProgressContainer != null) {
				setListShown(false, false);
			}
		}
		mHandler.post(mRequestFocus);
	}

	public ListAdapter getListAdapter() {
		return mAdapter;
	}

	public ListView 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) {
		final Context context = getActivity();
		FrameLayout root = new FrameLayout(context);
		LinearLayout pframe = new LinearLayout(context);
		pframe.setId(INTERNAL_PROGRESS_CONTAINER_ID);
		pframe.setOrientation(android.widget.LinearLayout.VERTICAL);
		pframe.setVisibility(View.GONE);
		pframe.setGravity(Gravity.CENTER);
		ProgressBar progress = new ProgressBar(context, null,
				android.R.attr.progressBarStyleLarge);
		pframe.addView(progress, new FrameLayout.LayoutParams(
				ViewGroup.LayoutParams.WRAP_CONTENT,
				ViewGroup.LayoutParams.WRAP_CONTENT));
		root.addView(pframe, new FrameLayout.LayoutParams(
				ViewGroup.LayoutParams.MATCH_PARENT,
				ViewGroup.LayoutParams.MATCH_PARENT));
		FrameLayout lframe = new FrameLayout(context);
		lframe.setId(INTERNAL_LIST_CONTAINER_ID);
		TextView tv = new TextView(getActivity());
		tv.setId(INTERNAL_EMPTY_ID);
		tv.setGravity(Gravity.CENTER);
		lframe.addView(tv, new FrameLayout.LayoutParams(
				ViewGroup.LayoutParams.MATCH_PARENT,
				ViewGroup.LayoutParams.MATCH_PARENT));
		ListView lv = new ListView(getActivity());
		lv.setId(android.R.id.list);
		lv.setDrawSelectorOnTop(false);
		lframe.addView(lv, new FrameLayout.LayoutParams(
				ViewGroup.LayoutParams.MATCH_PARENT,
				ViewGroup.LayoutParams.MATCH_PARENT));
		root.addView(lframe, new FrameLayout.LayoutParams(
				ViewGroup.LayoutParams.MATCH_PARENT,
				ViewGroup.LayoutParams.MATCH_PARENT));
		root.setLayoutParams(new FrameLayout.LayoutParams(
				ViewGroup.LayoutParams.MATCH_PARENT,
				ViewGroup.LayoutParams.MATCH_PARENT));
		return root;
	}

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

	public void onListItemClick(ListView 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;
	}

	public void setListAdapter(ListAdapter 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) {
		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 (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);
	}
}