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public class FragmentFile extends FragmentBase implements OnItemClickListener {

private FileAdapter mAdapter;
    private TextView first_letter_overlay;
    private ImageView alphabet_scroller;

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = super.onCreateView(inflater, container, savedInstanceState);
        // ~~~~~~~~~ 绑定控件
        first_letter_overlay = (TextView) v.findViewById(R.id.first_letter_overlay);
        alphabet_scroller = (ImageView) v.findViewById(R.id.alphabet_scroller);

// ~~~~~~~~~ 绑定事件
        alphabet_scroller.setClickable(true);
        alphabet_scroller.setOnTouchListener(asOnTouch);
        mListView.setOnItemClickListener(this);

// ~~~~~~~~~ 加载数据
        if (new SQLiteHelper(getActivity()).isEmpty())
            new ScanVideoTask().execute();
        else
            new DataTask().execute();

return v;
    }

/** 单击启动播放 */
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        final PFile f = mAdapter.getItem(position);
        Intent intent = new Intent(getActivity(), VideoViewDemo.class);
        intent.putExtra("path", f.path);
        startActivity(intent);
    }

private class DataTask extends AsyncTask<Void, Void, ArrayList<PFile>> {

@Override
        protected void onPreExecute() {
            super.onPreExecute();
            mLoadingLayout.setVisibility(View.VISIBLE);
            mListView.setVisibility(View.GONE);
        }

@Override
        protected ArrayList<PFile> doInBackground(Void... params) {
            return FileBusiness.getAllSortFiles(getActivity());
        }

@Override
        protected void onPostExecute(ArrayList<PFile> result) {
            super.onPostExecute(result);

mAdapter = new FileAdapter(getActivity(), FileBusiness.getAllSortFiles(getActivity()));
            mListView.setAdapter(mAdapter);

mLoadingLayout.setVisibility(View.GONE);
            mListView.setVisibility(View.VISIBLE);
        }
    }

/** 扫描SD卡 */
    private class ScanVideoTask extends AsyncTask<Void, File, ArrayList<PFile>> {
        private ProgressDialog pd;
        private ArrayList<File> files = new ArrayList<File>();

@Override
        protected void onPreExecute() {
            super.onPreExecute();
            pd = new ProgressDialog(getActivity());
            pd.setMessage("正在扫描视频文件...");
            pd.show();
        }

@Override
        protected ArrayList<PFile> doInBackground(Void... params) {
            // ~~~ 遍历文件夹
            eachAllMedias(Environment.getExternalStorageDirectory());

// ~~~ 入库
            SQLiteHelper sqlite = new SQLiteHelper(getActivity());
            SQLiteDatabase db = sqlite.getWritableDatabase();
            try {
                db.beginTransaction();

SQLiteStatement stat = db.compileStatement("INSERT INTO files(" + FilesColumns.COL_TITLE + "," + FilesColumns.COL_TITLE_PINYIN + "," + FilesColumns.COL_PATH + "," + FilesColumns.COL_LAST_ACCESS_TIME + ") VALUES(?,?,?,?)");
                for (File f : files) {
                    String name = FileUtils.getFileNameNoEx(f.getName());
                    int index = 1;
                    stat.bindString(index++, name);//title
                    stat.bindString(index++, PinyinUtils.chineneToSpell(name));//title_pinyin
                    stat.bindString(index++, f.getPath());//path
                    stat.bindLong(index++, System.currentTimeMillis());//last_access_time
                    stat.execute();
                }
                db.setTransactionSuccessful();
            } catch (BadHanyuPinyinOutputFormatCombination e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                db.endTransaction();
                db.close();
            }

// ~~~ 查询数据
            return FileBusiness.getAllSortFiles(getActivity());
        }

@Override
        protected void onProgressUpdate(final File... values) {
            File f = values[0];
            files.add(f);
            pd.setMessage(f.getName());
        }

/** 遍历所有文件夹，查找出视频文件 */
        public void eachAllMedias(File f) {
            if (f != null && f.exists() && f.isDirectory()) {
                File[] files = f.listFiles();
                if (files != null) {
                    for (File file : f.listFiles()) {
                        if (file.isDirectory()) {
                            eachAllMedias(file);
                        } else if (file.exists() && file.canRead() && FileUtils.isVideoOrAudio(file)) {
                            publishProgress(file);
                        }
                    }
                }
            }
        }

@Override
        protected void onPostExecute(ArrayList<PFile> result) {
            super.onPostExecute(result);
            mAdapter = new FileAdapter(getActivity(), result);
            mListView.setAdapter(mAdapter);
            pd.dismiss();
        }
    }

private class FileAdapter extends ArrayAdapter<PFile> {

public FileAdapter(Context ctx, ArrayList<PFile> l) {
            super(ctx, l);
        }

@Override
        public View getView(int position, View convertView, ViewGroup parent) {
            final PFile f = getItem(position);
            if (convertView == null) {
                final LayoutInflater mInflater = getActivity().getLayoutInflater();
                convertView = mInflater.inflate(R.layout.fragment_file_item, null);
            }
            ((TextView) convertView.findViewById(R.id.title)).setText(f.title);
            return convertView;
        }

}

/**
     * A-Z
     */
    private OnTouchListener asOnTouch = new OnTouchListener() {

@Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:// 0
                alphabet_scroller.setPressed(true);
                first_letter_overlay.setVisibility(View.VISIBLE);
                mathScrollerPosition(event.getY());
                break;
            case MotionEvent.ACTION_UP:// 1
                alphabet_scroller.setPressed(false);
                first_letter_overlay.setVisibility(View.GONE);
                break;
            case MotionEvent.ACTION_MOVE:
                mathScrollerPosition(event.getY());
                break;
            }
            return false;
        }
    };

/**
     * 显示字符
     * 
     * @param y
     */
    private void mathScrollerPosition(float y) {
        int height = alphabet_scroller.getHeight();
        float charHeight = height / 28.0f;
        char c = 'A';
        if (y < 0)
            y = 0;
        else if (y > height)
            y = height;

int index = (int) (y / charHeight) - 1;
        if (index < 0)
            index = 0;
        else if (index > 25)
            index = 25;

String key = String.valueOf((char) (c + index));
        first_letter_overlay.setText(key);

int position = 0;
        if (index == 0)
            mListView.setSelection(0);
        else if (index == 25)
            mListView.setSelection(mAdapter.getCount() - 1);
        else {
            for (PFile item : mAdapter.getAll()) {
                if (item.title_pinyin.startsWith(key)) {
                    mListView.setSelection(position);
                    break;
                }
                position++;
            }
        }
    }