/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.example.android.apis.view;import com.example.android.apis.R;import android.app.ListActivity;import android.content.Context;import android.graphics.PixelFormat;import android.os.Bundle;import android.os.Handler;import android.view.View;import android.view.LayoutInflater;import android.view.WindowManager;import android.view.WindowManager.LayoutParams;import android.widget.AbsListView;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.TextView;/** * Another variation of the list of cheeses. In this case, we use * {@link AbsListView#setOnScrollListener(AbsListView.OnScrollListener)  * AbsListView#setOnItemScrollListener(AbsListView.OnItemScrollListener)} to display the * first letter of the visible range of cheeses. */public class List9 extends ListActivity implements ListView.OnScrollListener {    private final class RemoveWindow implements Runnable {        public void run() {            removeWindow();        }    }    private RemoveWindow mRemoveWindow = new RemoveWindow();    Handler mHandler = new Handler();    private WindowManager mWindowManager;    private TextView mDialogText;    private boolean mShowing;    private boolean mReady;    private char mPrevLetter = Character.MIN_VALUE;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        mWindowManager = (WindowManager)getSystemService(Context.WINDOW_SERVICE);                // Use an existing ListAdapter that will map an array        // of strings to TextViews        setListAdapter(new ArrayAdapter<String>(this,                android.R.layout.simple_list_item_1, mStrings));                getListView().setOnScrollListener(this);                LayoutInflater inflate = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);                mDialogText = (TextView) inflate.inflate(R.layout.list_position, null);        mDialogText.setVisibility(View.INVISIBLE);                mHandler.post(new Runnable() {            public void run() {                mReady = true;                WindowManager.LayoutParams lp = new WindowManager.LayoutParams(                        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,                        WindowManager.LayoutParams.TYPE_APPLICATION,                        WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE                                | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,                        PixelFormat.TRANSLUCENT);                mWindowManager.addView(mDialogText, lp);            }});    }        @Override    protected void onResume() {        super.onResume();        mReady = true;    }        @Override    protected void onPause() {        super.onPause();        removeWindow();        mReady = false;    }    @Override    protected void onDestroy() {        super.onDestroy();        mWindowManager.removeView(mDialogText);        mReady = false;    }               public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {        int lastItem = firstVisibleItem + visibleItemCount - 1;        if (mReady) {            char firstLetter = mStrings[firstVisibleItem].charAt(0);                        if (!mShowing && firstLetter != mPrevLetter) {                mShowing = true;                mDialogText.setVisibility(View.VISIBLE);                           }            mDialogText.setText(((Character)firstLetter).toString());            mHandler.removeCallbacks(mRemoveWindow);            mHandler.postDelayed(mRemoveWindow, 3000);            mPrevLetter = firstLetter;        }    }        public void onScrollStateChanged(AbsListView view, int scrollState) {    }            private void removeWindow() {        if (mShowing) {            mShowing = false;            mDialogText.setVisibility(View.INVISIBLE);        }    }    private String[] mStrings = {            "Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam",            "Abondance", "Ackawi", "Acorn", "Adelost", "Affidelice au Chablis",            "Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre",            "Allgauer Emmentaler", "Alverca", "Ambert", "American Cheese",            "Ami du Chambertin", "Anejo Enchilado", "Anneau du Vic-Bilh",            "Anthoriro", "Appenzell", "Aragon", "Ardi Gasna", "Ardrahan",            "Armenian String", "Aromes au Gene de Marc", "Asadero", "Asiago",            "Aubisque Pyrenees", "Autun", "Avaxtskyr", "Baby Swiss", "Babybel",            "Baguette Laonnaise", "Bakers", "Baladi", "Balaton", "Bandal",            "Banon", "Barry's Bay Cheddar", "Basing", "Basket Cheese",            "Bath Cheese", "Bavarian Bergkase", "Baylough", "Beaufort",            "Beauvoorde", "Beenleigh Blue", "Beer Cheese", "Bel Paese",            "Bergader", "Bergere Bleue", "Berkswell", "Beyaz Peynir",            "Bierkase", "Bishop Kennedy", "Blarney", "Bleu d'Auvergne",            "Bleu de Gex", "Bleu de Laqueuille", "Bleu de Septmoncel",            "Bleu Des Causses", "Blue", "Blue Castello", "Blue Rathgore",