内容提供者从本地数据库获取音乐数据

内容提供者从本地数据库获取音乐数据

 

第一步：

ContentResolver resolver = getContentResolver()；

获取contentResolver

 

第二步：

Cursor cursor = resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null,null,null,null);

if (cursor != null){    while (cursor.moveToNext()){            String _data = cursor.getString(cursor.getColumnIndex("_data"));        String _display_name = cursor.getString(cursor.getColumnIndex("_display_name"));        String artist = cursor.getString(cursor.getColumnIndex("artist"));        String album = cursor.getString(cursor.getColumnIndex("album"));        long _size = Long.parseLong(cursor.getString(cursor.getColumnIndex("_size")));        MusicContent musicContent = new MusicContent(_data,_display_name,artist,album,_size);        arrayList.add(musicContent);

从数据库拿音乐文件

 

第三步：

public class MyAdapter extends BaseAdapter {    Context context;    ArrayList<MusicContent> arrayList;    public MyAdapter(Context context, ArrayList<MusicContent> arrayList) {        this.context = context;        this.arrayList = arrayList;    }    @Override    public int getCount() {        return arrayList.size();    }    @Override    public Object getItem(int position) {        return arrayList.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        convertView =  LayoutInflater.from(context).inflate(R.layout.list_item,null);        TextView textView = (TextView) convertView.findViewById(R.id.tv_item);        textView.setText((CharSequence) arrayList.get(position));        return convertView;    }

 

定义Adapter给listview设置数据。

 

 

给liveview设置数据在界面上展示：

MyAdapter myAdapter = new MyAdapter(this,arrayList);lv_view.setAdapter(myAdapter);