android高分段进阶攻略（8）音乐播放器代码实现一SlidingDrawer实现

本节继上节之后，应介绍用代码如何实现sildemenu这个抽屉效果，但是有点纠结，因为有些代码不是我写的，我看得头都昏了，还是没研究懂别人的想法，讲的不好的地方还求大家指正，顺便询问大家，哪里有Canvas和Paints的教程，我对这方面不是很在行，还希望大家给点学习意见。先贴下代码吧：

public class MusicPlayActivity extends Activity implementsIOnServiceConnectComplete {/** Called when the activity is first created. */private final static String TAG = "MusicPlayActivity";private final String BROCAST_NAME = "com.aimn.musicplay.brocast";private final static int REFRESH_PROGRESS_EVENT = 0x100;private final static int ABOUT_DIALOG_ID = 1;private Handler mHandler;private UIManager mUIManager;private ServiceManager mServiceManager;private MusicTimer mMusicTimer;private MusicPlayStateBrocast mPlayStateBrocast;private SDStateBrocast mSDStateBrocast;private List<MusicData> m_MusicFileList;private ListViewAdapter mListViewAdapter;private boolean mIsSdExist = false;private boolean mIsHaveData = false;private int mCurMusicTotalTime = 0;private int mCurPlayMode = MusicPlayMode.MPM_LIST_LOOP_PLAY;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);long time1 = System.currentTimeMillis();init();long time2 = System.currentTimeMillis();Log.i(TAG, "initViewcost = " + (time2 - time1));}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();mMusicTimer.stopTimer();unregisterReceiver(mPlayStateBrocast);unregisterReceiver(mSDStateBrocast);mServiceManager.disconnectService();}public void onResume() {super.onResume();Log.i(TAG, "onResume");}public void onStart() {super.onStart();Log.i(TAG, "onStart");}@Overrideprotected Dialog onCreateDialog(int id) {// TODO Auto-generated method stubswitch (id) {case ABOUT_DIALOG_ID: {Dialog aboutDialog = new AlertDialog.Builder(MusicPlayActivity.this).setIcon(R.drawable.about_dialog_icon).setTitle(R.string.about_title_name).setMessage(R.string.about_content).setPositiveButton("确定",new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog,int whichButton) {/* User clicked OK so do some stuff */}}).create();return aboutDialog;}default:break;}return null;}@Overridepublic void onBackPressed() {// TODO Auto-generated method stubmUIManager.Back();}public void init() {mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubswitch (msg.what) {case REFRESH_PROGRESS_EVENT:mUIManager.setPlayInfo(mServiceManager.getCurPosition(),mCurMusicTotalTime, null);break;default:break;}}};mUIManager = new UIManager();mServiceManager = new ServiceManager(this);mServiceManager.setOnServiceConnectComplete(this);mServiceManager.connectService();mMusicTimer = new MusicTimer(mHandler, REFRESH_PROGRESS_EVENT);m_MusicFileList = new ArrayList<MusicData>();mListViewAdapter = new ListViewAdapter(this, m_MusicFileList);mUIManager.mListView.setAdapter(mListViewAdapter);mPlayStateBrocast = new MusicPlayStateBrocast();IntentFilter intentFilter1 = new IntentFilter(BROCAST_NAME);registerReceiver(mPlayStateBrocast, intentFilter1);mSDStateBrocast = new SDStateBrocast();IntentFilter intentFilter2 = new IntentFilter();intentFilter2.addAction(Intent.ACTION_MEDIA_MOUNTED);intentFilter2.addAction(Intent.ACTION_MEDIA_UNMOUNTED);intentFilter2.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);intentFilter2.addAction(Intent.ACTION_MEDIA_EJECT);intentFilter2.addDataScheme("file");registerReceiver(mSDStateBrocast, intentFilter2);}private List<MusicData> getMusicFileList() {List<MusicData> list = new ArrayList<MusicData>();String[] projection = new String[] { MediaStore.Audio.Media._ID,MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.DURATION,MediaStore.Audio.Media.DATA, MediaStore.Audio.Media.ARTIST };long time1 = System.currentTimeMillis();Cursor cursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, projection, null,null, null);if (cursor != null) {cursor.moveToFirst();int colNameIndex = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);int colTimeIndex = cursor.getColumnIndex(MediaStore.Audio.Media.DURATION);int colPathIndex = cursor.getColumnIndex(MediaStore.Audio.Media.DATA);int colArtistIndex = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);int fileNum = cursor.getCount();for (int counter = 0; counter < fileNum; counter++) {MusicData data = new MusicData();data.mMusicName = cursor.getString(colNameIndex);data.mMusicTime = cursor.getInt(colTimeIndex);data.mMusicPath = cursor.getString(colPathIndex);data.mMusicAritst = cursor.getString(colArtistIndex);list.add(data);cursor.moveToNext();}cursor.close();}long time2 = System.currentTimeMillis();Log.i(TAG, "seach filelist cost = " + (time2 - time1));return list;}public void showNoData() {Toast.makeText(this, "No Music Data...", Toast.LENGTH_SHORT).show();}public void rePlay() {if (mIsHaveData == false) {showNoData();} else {mServiceManager.rePlay();}}public void play(int position) {if (mIsHaveData == false) {showNoData();} else {mServiceManager.play(position);}}public void pause() {mServiceManager.pause();}public void stop() {mServiceManager.stop();}public void playPre() {if (mIsHaveData == false) {showNoData();} else {mServiceManager.playPre();}}public void playNext() {if (mIsHaveData == false) {showNoData();} else {mServiceManager.playNext();}}public void seekTo(int rate) {mServiceManager.seekTo(rate);}public void exit() {mServiceManager.exit();finish();}public void modeChange() {mCurPlayMode++;if (mCurPlayMode > MusicPlayMode.MPM_RANDOM_PLAY) {mCurPlayMode = MusicPlayMode.MPM_SINGLE_LOOP_PLAY;}mServiceManager.setPlayMode(mCurPlayMode);mUIManager.setPlayMode(mCurPlayMode, true);}public void onMenuItemClick(int pos) {switch (pos) {case 0: // 设置Toast.makeText(this, "该功能尚未开放,请下版本再试", Toast.LENGTH_SHORT).show();break;case 1: // 关于showDialog(ABOUT_DIALOG_ID);break;case 2: // 云同步Toast.makeText(this, "该服务尚未开通,请购买后使用", Toast.LENGTH_SHORT).show();break;case 3: // 退出exit();break;default:break;}}@Overridepublic void OnServiceConnectComplete() {// TODO Auto-generated method stubLog.i(TAG, "OnServiceConnectComplete.......");// long time3 = System.currentTimeMillis();String state = Environment.getExternalStorageState().toString();if (state.equals(Environment.MEDIA_MOUNTED)) {mIsSdExist = true;} else {Toast.makeText(this, "SD卡未安装，建议安装SD卡", Toast.LENGTH_SHORT).show();return;}int playState = mServiceManager.getPlayState();switch (playState) {case MusicPlayState.MPS_NOFILE:m_MusicFileList = getMusicFileList();mServiceManager.refreshMusicList(m_MusicFileList);break;case MusicPlayState.MPS_INVALID:case MusicPlayState.MPS_PREPARE:case MusicPlayState.MPS_PLAYING:case MusicPlayState.MPS_PAUSE:long time1 = System.currentTimeMillis();m_MusicFileList = mServiceManager.getFileList();long time2 = System.currentTimeMillis();Log.i(TAG, "mServiceManager.getFileList()cost = "+ (time2 - time1));mServiceManager.sendPlayStateBrocast();break;default:break;}if (m_MusicFileList.size() > 0) {mIsHaveData = true;}mListViewAdapter.refreshAdapter(m_MusicFileList);mUIManager.setPlayMode(mServiceManager.getPlayMode(), false);}class SDStateBrocast extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubString action = intent.getAction();if (action.equals(Intent.ACTION_MEDIA_MOUNTED)) {mIsSdExist = true;} else if (action.equals(Intent.ACTION_MEDIA_UNMOUNTED)) {mIsSdExist = false;} else if (Intent.ACTION_MEDIA_SCANNER_FINISHED.equals(action)) {if (mIsSdExist) {m_MusicFileList = getMusicFileList();mServiceManager.refreshMusicList(m_MusicFileList);if (m_MusicFileList.size() > 0) {mIsHaveData = true;}mListViewAdapter.refreshAdapter(m_MusicFileList);}} else if (Intent.ACTION_MEDIA_EJECT.equals(action)) {m_MusicFileList.clear();mListViewAdapter.refreshAdapter(m_MusicFileList);mIsHaveData = false;mUIManager.emptyPlayInfo();}}}class MusicPlayStateBrocast extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubString action = intent.getAction();if (action.equals(BROCAST_NAME)) {TransPlayStateEvent(intent);}}public void TransPlayStateEvent(Intent intent) {MusicData data = new MusicData();int playState = intent.getIntExtra(MusicPlayState.PLAY_STATE_NAME,-1);Bundle bundle = intent.getBundleExtra(MusicData.KEY_MUSIC_DATA);if (bundle != null) {data = bundle.getParcelable(MusicData.KEY_MUSIC_DATA);}int playIndex = intent.getIntExtra(MusicPlayState.PLAY_MUSIC_INDEX,-1);switch (playState) {case MusicPlayState.MPS_INVALID:mMusicTimer.stopTimer();Toast.makeText(MusicPlayActivity.this, "当前音乐文件无效",Toast.LENGTH_SHORT).show();mUIManager.setPlayInfo(0, data.mMusicTime, data.mMusicName);mUIManager.showPlay(true);break;case MusicPlayState.MPS_PREPARE:mMusicTimer.stopTimer();mCurMusicTotalTime = data.mMusicTime;if (mCurMusicTotalTime == 0) {mCurMusicTotalTime = mServiceManager.getDuration();}mUIManager.setPlayInfo(0, data.mMusicTime, data.mMusicName);mUIManager.showPlay(true);break;case MusicPlayState.MPS_PLAYING:mMusicTimer.startTimer();if (mCurMusicTotalTime == 0) {mCurMusicTotalTime = mServiceManager.getDuration();}mUIManager.setPlayInfo(mServiceManager.getCurPosition(),data.mMusicTime, data.mMusicName);mUIManager.showPlay(false);break;case MusicPlayState.MPS_PAUSE:mMusicTimer.stopTimer();if (mCurMusicTotalTime == 0) {mCurMusicTotalTime = mServiceManager.getDuration();}mUIManager.setPlayInfo(mServiceManager.getCurPosition(),data.mMusicTime, data.mMusicName);mUIManager.showPlay(true);break;default:break;}mUIManager.setSongNumInfo(playIndex, m_MusicFileList.size());mListViewAdapter.setPlayState(playIndex, playState);}}public boolean onMenuOpened(int featureId, Menu menu) { // 截获菜单事件// TODO Auto-generated method stubmUIManager.showMenuWindow();return false; // 返回为true 则显示系统menu}public boolean onCreateOptionsMenu(Menu menu) {// TODO Auto-generated method stubmenu.add("menu");// 必须创建一项return super.onCreateOptionsMenu(menu);}class UIManager implements OnItemClickListener {private final static String TAG = "UIManager";private SliderDrawerManager mSliderDrawerManager;private PopMenuManager mPopMenuManager;public ListView mListView;private View mMusicListView;private int mModeDrawableIDS[] = { R.drawable.mode_single_loop,R.drawable.mode_order, R.drawable.mode_list_loop,R.drawable.mode_random };private String modeToasts[] = { "单曲循环", "顺序播放", "列表循环", "随机播放" };public UIManager() {initView();}private void initView() {mListView = (ListView) findViewById(R.id.listView);mListView.setOnItemClickListener(this);mMusicListView = findViewById(R.id.ListLayout);mSliderDrawerManager = new SliderDrawerManager();mPopMenuManager = new PopMenuManager();}public void setPlayInfo(int curTime, int totalTime, String musicName) {curTime /= 1000;totalTime /= 1000;int curminute = curTime / 60;int cursecond = curTime % 60;String curTimeString = String.format("%02d:%02d", curminute,cursecond);int totalminute = totalTime / 60;int totalsecond = totalTime % 60;String totalTimeString = String.format("%02d:%02d", totalminute,totalsecond);int rate = 0;if (totalTime != 0) {rate = (int) ((float) curTime / totalTime * 100);}mSliderDrawerManager.mPlayProgress.setProgress(rate);mSliderDrawerManager.mcurtimeTextView.setText(curTimeString);mSliderDrawerManager.mtotaltimeTextView.setText(totalTimeString);if (musicName != null) {mSliderDrawerManager.mPlaySongTextView.setText(musicName);}}public void emptyPlayInfo() {mSliderDrawerManager.mPlayProgress.setProgress(0);mSliderDrawerManager.mcurtimeTextView.setText("00:00");mSliderDrawerManager.mtotaltimeTextView.setText("00:00");mSliderDrawerManager.mPlaySongTextView.setText(R.string.default_title_name);}public void setSongNumInfo(int curPlayIndex, int totalSongNum) {String str = String.valueOf(curPlayIndex + 1) + "/"+ String.valueOf(totalSongNum);mSliderDrawerManager.mSongNumTextView.setText(str);}public void showPlay(boolean flag) {if (flag) {mSliderDrawerManager.mBtnPlay.setVisibility(View.VISIBLE);mSliderDrawerManager.mBtnPause.setVisibility(View.GONE);mSliderDrawerManager.mBtnHandlePlay.setVisibility(View.VISIBLE);mSliderDrawerManager.mBtnHandlePause.setVisibility(View.INVISIBLE);} else {mSliderDrawerManager.mBtnPlay.setVisibility(View.GONE);mSliderDrawerManager.mBtnPause.setVisibility(View.VISIBLE);mSliderDrawerManager.mBtnHandlePlay.setVisibility(View.INVISIBLE);mSliderDrawerManager.mBtnHandlePause.setVisibility(View.VISIBLE);}}public void ShowHandlePanel(boolean flag) {if (flag) {mSliderDrawerManager.mHandlePane.setVisibility(View.VISIBLE);} else {mSliderDrawerManager.mHandlePane.setVisibility(View.INVISIBLE);}}public void setPlayMode(int mode, Boolean bShowToast) {if (mode >= MusicPlayMode.MPM_SINGLE_LOOP_PLAY&& mode <= MusicPlayMode.MPM_RANDOM_PLAY) {mSliderDrawerManager.mBtnModeSet.setImageResource(mModeDrawableIDS[mode]);if (bShowToast) {Toast.makeText(MusicPlayActivity.this, modeToasts[mode],Toast.LENGTH_SHORT).show();}}}public void Back() {if (mSliderDrawerManager.mSlidingDrawer.isOpened()) {mSliderDrawerManager.mSlidingDrawer.close();} else {finish();}}public void showMenuWindow() {mPopMenuManager.showMenuWindow();}@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int pos,long arg3) {// TODO Auto-generated method stubplay(pos);}class SliderDrawerManager implements OnClickListener,OnSeekBarChangeListener, OnDrawerOpenListener,OnDrawerCloseListener, IOnSliderHandleViewClickListener {public MySlidingDrawer mSlidingDrawer;public ImageButton mBtnHandle;public ImageButton mBtnHandlePlay;public ImageButton mBtnHandlePause;public TextView mSongNumTextView;public View mHandlePane;public TextView mPlaySongTextView;public ImageButton mBtnModeSet;public ImageButton mBtnVolumnSet;public SeekBar mPlayProgress;public TextView mcurtimeTextView;public TextView mtotaltimeTextView;public ImageButton mBtnPlay;public ImageButton mBtnPause;public ImageButton mBtnStop;public ImageButton mBtnPlayNext;public ImageButton mBtnPlayPre;public ImageButton mBtnMenu;private boolean mPlayAuto = true;private GalleryFlow mGalleryFlow1;private GalleryFlow mGalleryFlow2;public SliderDrawerManager() {initView();}private void initView() {mBtnPlay = (ImageButton) findViewById(R.id.buttonPlay);mBtnPause = (ImageButton) findViewById(R.id.buttonPause);mBtnStop = (ImageButton) findViewById(R.id.buttonStop);mBtnPlayPre = (ImageButton) findViewById(R.id.buttonPlayPre);mBtnPlayNext = (ImageButton) findViewById(R.id.buttonPlayNext);mBtnMenu = (ImageButton) findViewById(R.id.buttonMenu);mBtnModeSet = (ImageButton) findViewById(R.id.buttonMode);mBtnVolumnSet = (ImageButton) findViewById(R.id.buttonVolumn);mBtnHandle = (ImageButton) findViewById(R.id.handler_icon);mBtnHandlePlay = (ImageButton) findViewById(R.id.handler_play);mBtnHandlePause = (ImageButton) findViewById(R.id.handler_pause);mBtnPlay.setOnClickListener(this);mBtnPause.setOnClickListener(this);mBtnStop.setOnClickListener(this);mBtnPlayPre.setOnClickListener(this);mBtnPlayNext.setOnClickListener(this);mBtnStop.setOnClickListener(this);mBtnMenu.setOnClickListener(this);mBtnModeSet.setOnClickListener(this);mBtnVolumnSet.setOnClickListener(this);mPlaySongTextView = (TextView) findViewById(R.id.textPlaySong);mcurtimeTextView = (TextView) findViewById(R.id.textViewCurTime);mtotaltimeTextView = (TextView) findViewById(R.id.textViewTotalTime);mSongNumTextView = (TextView) findViewById(R.id.textSongNum);mPlayProgress = (SeekBar) findViewById(R.id.seekBar);mPlayProgress.setOnSeekBarChangeListener(this);mSlidingDrawer = (MySlidingDrawer) findViewById(R.id.slidingDrawer);mSlidingDrawer.setOnDrawerOpenListener(this);mSlidingDrawer.setOnDrawerCloseListener(this);mSlidingDrawer.setHandleId(R.id.handler_icon);mSlidingDrawer.setTouchableIds(new int[] { R.id.handler_play,R.id.handler_pause });mSlidingDrawer.setOnSliderHandleViewClickListener(this);mHandlePane = findViewById(R.id.handle_panel);Integer[] images1 = { R.drawable.ablumlayout_bg };ImageAdapter adapter1 = new ImageAdapter(MusicPlayActivity.this, images1);adapter1.createReflectedImages();mGalleryFlow1 = (GalleryFlow) findViewById(R.id.imageGallery1);mGalleryFlow1.setAdapter(adapter1);Integer[] images2 = { R.drawable.ablum_deflaut };ImageAdapter adapter2 = new ImageAdapter(MusicPlayActivity.this, images2);adapter2.createReflectedImages(23);mGalleryFlow2 = (GalleryFlow) findViewById(R.id.imageGallery2);mGalleryFlow2.setAdapter(adapter2);}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.buttonPlay:rePlay();break;case R.id.buttonPause:pause();break;case R.id.buttonStop:stop();break;case R.id.buttonPlayPre:playPre();break;case R.id.buttonPlayNext:playNext();break;case R.id.buttonMenu:showMenuWindow();break;case R.id.buttonMode:modeChange();break;case R.id.buttonVolumn:Toast.makeText(MusicPlayActivity.this, "暂时不支持gaigong的",Toast.LENGTH_SHORT).show();;break;default:break;}}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stubif (mPlayAuto == false) {mServiceManager.seekTo(progress);}}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubmPlayAuto = false;}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubmPlayAuto = true;}@Overridepublic void onDrawerOpened() {// TODO Auto-generated method stubmMusicListView.setVisibility(View.INVISIBLE);mBtnHandle.setImageResource(R.drawable.handle_down);ShowHandlePanel(false);}@Overridepublic void onDrawerClosed() {// TODO Auto-generated method stubmMusicListView.setVisibility(View.VISIBLE);mBtnHandle.setImageResource(R.drawable.handle_up);ShowHandlePanel(true);}@Overridepublic void onViewClick(View view) {// TODO Auto-generated method stubswitch (view.getId()) {case R.id.handler_play:rePlay();break;case R.id.handler_pause:pause();break;default:break;}}}class PopMenuManager implementsandroid.widget.PopupWindow.OnDismissListener {MenuItemData mMenuItemData;private GridView mMenuGrid; // 弹出菜单GRIDVIEWprivate View mMenuView; // 弹出菜单视图private GridViewAdapter mGridViewAdapter; // 弹出菜单适配器private PopupWindow mPopupWindow; // 弹出菜单WINDOWprivate View mPopBackgroundView;public PopMenuManager() {initView();}private void initView() {mPopBackgroundView = findViewById(R.id.VirtualLayout);String[] menu_name_array1 = getResources().getStringArray(R.array.menu_item_name_array);LevelListDrawable levelListDrawable1 = (LevelListDrawable) getResources().getDrawable(R.drawable.menu_image_list);mMenuItemData = new MenuItemData(levelListDrawable1,menu_name_array1, menu_name_array1.length);LayoutInflater inflater = getLayoutInflater();mMenuView = inflater.inflate(R.layout.menu, null);mMenuGrid = (GridView) mMenuView.findViewById(R.id.menuGridView);mGridViewAdapter = new GridViewAdapter(MusicPlayActivity.this,mMenuItemData);mMenuGrid.setAdapter(mGridViewAdapter);mMenuGrid.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {// TODO Auto-generated method stubonMenuItemClick(position);}});mMenuGrid.setOnKeyListener(new OnKeyListener() {@Overridepublic boolean onKey(View v, int keyCode, KeyEvent event) {// TODO Auto-generated method stubswitch (keyCode) {case KeyEvent.KEYCODE_MENU:showMenuWindow();break;}return false;}});mPopupWindow = new PopupWindow(mMenuView,LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);mPopupWindow.setFocusable(true); // 如果没有获得焦点menu菜单中的控件事件无法响应// 以下两行加上去后就可以使用BACK键关闭POPWINDOWColorDrawable dw = new ColorDrawable(0x00);mPopupWindow.setBackgroundDrawable(dw);mPopupWindow.setAnimationStyle(android.R.style.Animation_Toast);mPopupWindow.setOnDismissListener(this);}public void showMenuWindow() {if (mPopupWindow.isShowing()) {mPopupWindow.dismiss();mPopBackgroundView.setVisibility(View.INVISIBLE);} else {mPopupWindow.showAsDropDown(findViewById(R.id.mainLayout),0, -125);mPopBackgroundView.setVisibility(View.VISIBLE);}}@Overridepublic void onDismiss() {// TODO Auto-generated method stubmPopBackgroundView.setVisibility(View.INVISIBLE);}}}}

这只是mainactivity，不要害怕代码多，我们一点一点分析，我们顺序来看，mainactivity继承了IOnServiceConnectComplete接口，这是AIDL接口，关于AIDL的内容后续我们会详细介绍，今天就暂不介绍，然后是init（）方法，初始化mainactivity信息，找到该方法，发现这个方法首先生成了一个UIManager实例，发现UIManager是个内部类，发现它的构造方法也是调用了一个initView（），然后发现它又生成了一个SliderDrawerManager()的实例，而这个SliderDrawerManager();就是我们今天的重点，实现昨天的自定义SliderDrawer。

找到SliderDrawerManager这个内部类，代码如下：

class SliderDrawerManager implements OnClickListener,OnSeekBarChangeListener, OnDrawerOpenListener,OnDrawerCloseListener, IOnSliderHandleViewClickListener {public MySlidingDrawer mSlidingDrawer;public ImageButton mBtnHandle;public ImageButton mBtnHandlePlay;public ImageButton mBtnHandlePause;public TextView mSongNumTextView;public View mHandlePane;public TextView mPlaySongTextView;public ImageButton mBtnModeSet;public ImageButton mBtnVolumnSet;public SeekBar mPlayProgress;public TextView mcurtimeTextView;public TextView mtotaltimeTextView;public ImageButton mBtnPlay;public ImageButton mBtnPause;public ImageButton mBtnStop;public ImageButton mBtnPlayNext;public ImageButton mBtnPlayPre;public ImageButton mBtnMenu;private boolean mPlayAuto = true;private GalleryFlow mGalleryFlow1;private GalleryFlow mGalleryFlow2;public SliderDrawerManager() {initView();}private void initView() {mBtnPlay = (ImageButton) findViewById(R.id.buttonPlay);mBtnPause = (ImageButton) findViewById(R.id.buttonPause);mBtnStop = (ImageButton) findViewById(R.id.buttonStop);mBtnPlayPre = (ImageButton) findViewById(R.id.buttonPlayPre);mBtnPlayNext = (ImageButton) findViewById(R.id.buttonPlayNext);mBtnMenu = (ImageButton) findViewById(R.id.buttonMenu);mBtnModeSet = (ImageButton) findViewById(R.id.buttonMode);mBtnVolumnSet = (ImageButton) findViewById(R.id.buttonVolumn);mBtnHandle = (ImageButton) findViewById(R.id.handler_icon);mBtnHandlePlay = (ImageButton) findViewById(R.id.handler_play);mBtnHandlePause = (ImageButton) findViewById(R.id.handler_pause);mBtnPlay.setOnClickListener(this);mBtnPause.setOnClickListener(this);mBtnStop.setOnClickListener(this);mBtnPlayPre.setOnClickListener(this);mBtnPlayNext.setOnClickListener(this);mBtnStop.setOnClickListener(this);mBtnMenu.setOnClickListener(this);mBtnModeSet.setOnClickListener(this);mBtnVolumnSet.setOnClickListener(this);mPlaySongTextView = (TextView) findViewById(R.id.textPlaySong);mcurtimeTextView = (TextView) findViewById(R.id.textViewCurTime);mtotaltimeTextView = (TextView) findViewById(R.id.textViewTotalTime);mSongNumTextView = (TextView) findViewById(R.id.textSongNum);mPlayProgress = (SeekBar) findViewById(R.id.seekBar);mPlayProgress.setOnSeekBarChangeListener(this);mSlidingDrawer = (MySlidingDrawer) findViewById(R.id.slidingDrawer);mSlidingDrawer.setOnDrawerOpenListener(this);mSlidingDrawer.setOnDrawerCloseListener(this);mSlidingDrawer.setHandleId(R.id.handler_icon);mSlidingDrawer.setTouchableIds(new int[] { R.id.handler_play,R.id.handler_pause });mSlidingDrawer.setOnSliderHandleViewClickListener(this);mHandlePane = findViewById(R.id.handle_panel);Integer[] images1 = { R.drawable.ablumlayout_bg };ImageAdapter adapter1 = new ImageAdapter(MusicPlayActivity.this, images1);adapter1.createReflectedImages();mGalleryFlow1 = (GalleryFlow) findViewById(R.id.imageGallery1);mGalleryFlow1.setAdapter(adapter1);Integer[] images2 = { R.drawable.ablum_deflaut };ImageAdapter adapter2 = new ImageAdapter(MusicPlayActivity.this, images2);adapter2.createReflectedImages(23);mGalleryFlow2 = (GalleryFlow) findViewById(R.id.imageGallery2);mGalleryFlow2.setAdapter(adapter2);}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.buttonPlay:rePlay();break;case R.id.buttonPause:pause();break;case R.id.buttonStop:stop();break;case R.id.buttonPlayPre:playPre();break;case R.id.buttonPlayNext:playNext();break;case R.id.buttonMenu:showMenuWindow();break;case R.id.buttonMode:modeChange();break;case R.id.buttonVolumn:Toast.makeText(MusicPlayActivity.this, "暂时不支持该功能的",Toast.LENGTH_SHORT).show();;break;default:break;}}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stubif (mPlayAuto == false) {mServiceManager.seekTo(progress);}}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubmPlayAuto = false;}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubmPlayAuto = true;}@Overridepublic void onDrawerOpened() {// TODO Auto-generated method stubmMusicListView.setVisibility(View.INVISIBLE);mBtnHandle.setImageResource(R.drawable.handle_down);ShowHandlePanel(false);}@Overridepublic void onDrawerClosed() {// TODO Auto-generated method stubmMusicListView.setVisibility(View.VISIBLE);mBtnHandle.setImageResource(R.drawable.handle_up);ShowHandlePanel(true);}@Overridepublic void onViewClick(View view) {// TODO Auto-generated method stubswitch (view.getId()) {case R.id.handler_play:rePlay();break;case R.id.handler_pause:pause();break;default:break;}}}

前面都是绑定昨天SliderDrawer的UI控件的id，如下图

看到这里mSlidingDrawer = (MySlidingDrawer) findViewById(R.id.slidingDrawer);我们绑定了上节中我们设置的slidingDrawer，然后实现了setOnDrawerOpenListener和setOnDrawerCloseListener方法，虽然昨天我们自定义的MySlidingDrawer里面没有这两个方法，但是这是继承了父类SlidingDrawer的方法，SlidingDrawer一共有三个监听事件，注意三者的执行顺序,总的原则是: 滑动完成后,打开(或者关闭)抽屉。所以:执行的顺序 1 setOnDrawerScrollListener，2setOnDrawerOpenListener或setOnDrawerCloseListener。其实到这里我们就已经可以知道我们如何实现slidingDrawer，我们总结下：

     自定义slidingDrawer，然后再xml实现它，包括抽屉头，hand，抽屉内容view，然后实例化SlidingDrawer，在

setOnDrawerOpenListener和setOnDrawerCloseListener里面写控件的变化，最终实现抽屉效果。

     后面的imageAdapter是个UI设计Adapter就是绘画中间那个音乐符的UI，代码如下：

public class ImageAdapter extends BaseAdapter {int mGalleryItemBackground;private Context mContext;private Integer[] mImageIds;private ImageView[] mImages;private int mCount;public ImageAdapter(Context c, Integer[] ImageIds) {mContext = c;mImageIds = ImageIds;mImages = new ImageView[mImageIds.length];mCount = mImageIds.length;}public boolean createReflectedImages() {return createReflectedImages(0);}public boolean createReflectedImages(int padding) {final int reflectionGap = 4;int index = 0;for (int imageId : mImageIds) {Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);if (originalImage == null){mCount--;continue;}int width = originalImage.getWidth();int height = originalImage.getHeight();Matrix matrix = new Matrix();//matrix.setRotate(30);matrix.preScale(1, -1);Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,height / 2, width, height / 2, matrix, false);Bitmap bitmapWithReflection = Bitmap.createBitmap(width,(height + height / 2), Config.ARGB_8888);Canvas canvas = new Canvas(bitmapWithReflection);canvas.drawBitmap(originalImage, 0, 0, null);Paint deafaultPaint = new Paint();// 抗锯齿的方法// deafaultPaint.setAntiAlias(true);canvas.drawRect(0, height, width, height + reflectionGap,deafaultPaint);canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);Paint paint = new Paint();// 抗锯齿的方法// paint.setAntiAlias(true);LinearGradient shader = new LinearGradient(0,originalImage.getHeight(), 0,bitmapWithReflection.getHeight() + reflectionGap,0x70ffffff, 0x00ffffff, TileMode.CLAMP);paint.setShader(shader);paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()+ reflectionGap, paint);ImageView imageView = new ImageView(mContext);imageView.setImageBitmap(bitmapWithReflection);imageView.setLayoutParams(new GalleryFlow.LayoutParams(180, 240));// imageView.setScaleType(ScaleType.MATRIX);imageView.setPadding(padding, padding, padding, padding);mImages[index++] = imageView;}return true;}private Resources getResources() {// TODO Auto-generated method stubreturn null;}public int getCount() {return mCount;}public Object getItem(int position) {return position;}public long getItemId(int position) {return position;}public View getView(int position, View convertView, ViewGroup parent) {return mImages[position];}public float getScale(boolean focused, int offset) {return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));}}

     这里不是我写的，所以我也不知道具体绘画内容，到此SlidingDrawer抽屉效果讲解完了，下一节我们将详细分析这个mainactivity，看它是如何传递消息的。