Android 是否要从contentProvider获取特定行？

我试图创建多个表，方法是为表中的每一列插入一个标记，然后根据标记名对它们进行排序

• 例如：
• 标签=食物
• 食用香蕉
• 食用苹果

• 标签=电影

• 电影E.T
• 电影蜘蛛侠

我知道如何在常规方法中使用一些for循环来实现这一点，例如：

public ArrayList<Items> getall(String tag ,boolean first) {
    open();
    ArrayList<Items> list = new ArrayList<Items>();
    Cursor cur = myDb.query(TABLE_NOTES, null, null, null, null, null, null, null);
    while (cur.moveToNext()) {
        if (first) {
        Items data = new Items(cur.getString(1),cur.getString(2),cur.getFloat(3),cur.getString(4));
        list.add(data);
        }
        if(cur.getString(2).equals(tag)&&!first){
            Items data = new Items(cur.getString(1),cur.getString(2),cur.getFloat(3),cur.getString(4));
        list.add(data);
        }
    }
    close();
    return list;
}

公共类DbHandler扩展了SQLiteOpenHelper{

    public static final String DBName = "noteDb.db";
    public static final int Version = 1;


    public static final String TABLE = "Notes";
    public static final String ID = "_id";
    public static final String NOTES = "myNotes";
    public static final String TAGS = "myTags";
    public static final String SET1 = "set1";
    public static final String SET2 = "set2";

    private static final String CREATE_TABLE_NOTES = "CREATE TABLE "
            + TABLE + "(" + ID + " INTEGER PRIMARY KEY," + NOTES
            + " TEXT,"+TAGS + " TEXT,"+SET1+ " REAL,"+SET2+" TEXT)";


    public DbHandler(Context context) {
        super(context, DBName, null, Version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE_NOTES);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + TABLE);
        onCreate(db);
    }



}

编辑：

    static int MY_LOADER_ID = 1;
    DbHandler myDb;

    ListView lv;
    CustomCursorAdapter adapter;
    ArrayList<Notes> list = new ArrayList<Notes>();
    Spinner sp;
    String[] spData;
     ArrayList<String> sortedList;
     ArrayAdapter<String> adapterSpinner;

      String category = "";
      String note = "";
      float set1 = 0;
      String set2 = ""; 
      Cursor cursor;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv = (ListView) findViewById(R.id.listView1);
        lv.setOnItemClickListener(this);

        cursor = getContentResolver().query(StatusProvider.CONTENT_URI, null, null, null, null);
        adapter = new CustomCursorAdapter(this, cursor, 0);
        lv.setAdapter(adapter);

        getLoaderManager().initLoader(MY_LOADER_ID, null, this);

        sp = (Spinner) findViewById(R.id.spinner1);
        adapterSpinner = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, setSpinnerTags());
        sp.setAdapter(adapterSpinner);
        sp.setOnItemSelectedListener(this);

    }



    //Set the tags names on the spinner
    private String[] setSpinnerTags() {
        ArrayList<String> result = new ArrayList<String>();
        while (cursor.moveToNext()) {
            String tagGet = cursor.getString(cursor.getColumnIndex(DbHandler.TAGS));
            if(!result.contains(tagGet)){
                result.add(tagGet);
            }
        }
        spData = new String[result.size()];
        for (int i = 0; i < result.size(); i++) {
            spData[i] = result.get(i);
        }
        return spData;
    }



    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position,
            long id) {

//HERE is the title of th tags 
        String theTitle = spData[position];

        //?????? What i do need the write here?

            switch (position) {
            case 0:

                break;

            default:
                break;
            }
    }


    @Override
    public void onNothingSelected(AdapterView<?> parent) {
    }



    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        return new CursorLoader(this, StatusProvider.CONTENT_URI, null, null, null, null);
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        adapter.swapCursor(data);

    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        adapter.swapCursor(null);

    }
    public void refreshList(){
        getLoaderManager().restartLoader(MY_LOADER_ID, null, this);
    }

}

static int MY_LOADER_ID=1；
数据库处理器myDb；
ListView lv；
自定义游标适配器；
ArrayList=新建ArrayList（）；
纺纱机；
字符串[]spData；
ArrayList分类列表；
阵列适配器；
字符串类别=”；
字符串注释=”；
浮动设置1=0；
字符串set2=“”；
光标；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
lv=（ListView）findViewById（R.id.listView1）；
lv.setOnItemClickListener（本）；
cursor=getContentResolver（）.query（StatusProvider.CONTENT\u URI，null，null，null）；
适配器=新的CustomCursorAdapter（这个，游标，0）；
低压设置适配器（适配器）；
getLoaderManager（）.initLoader（我的加载程序ID，null，this）；
sp=（喷丝器）findViewById（R.id.spinner1）；
adapterSpinner=new ArrayAdapter（这个，android.R.layout.simple_list_item_1，setSpinnerTags（））；
sp.setAdapter（adapterSpinner）；
sp.setOnItemSelectedListener（此）；
}
//在微调器上设置标记名称
私有字符串[]setPinnerTags（）{
ArrayList结果=新建ArrayList（）；
while（cursor.moveToNext（））{
String tagGet=cursor.getString（cursor.getColumnIndex（DbHandler.TAGS））；
如果（！result.contains（tagGet））{
结果。添加（标记）；
}
}
spData=新字符串[result.size（）]；
对于（int i=0；i

请参阅选择和SelectionAgs paramsIm，内容提供商有点新功能。你能给我举个例子吗？这和内容提供商没什么关系，我是说db.QUERI不能理解你的意思。。（创建一个选择，其中第二列=标记）

    static int MY_LOADER_ID = 1;
    DbHandler myDb;

    ListView lv;
    CustomCursorAdapter adapter;
    ArrayList<Notes> list = new ArrayList<Notes>();
    Spinner sp;
    String[] spData;
     ArrayList<String> sortedList;
     ArrayAdapter<String> adapterSpinner;

      String category = "";
      String note = "";
      float set1 = 0;
      String set2 = ""; 
      Cursor cursor;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv = (ListView) findViewById(R.id.listView1);
        lv.setOnItemClickListener(this);

        cursor = getContentResolver().query(StatusProvider.CONTENT_URI, null, null, null, null);
        adapter = new CustomCursorAdapter(this, cursor, 0);
        lv.setAdapter(adapter);

        getLoaderManager().initLoader(MY_LOADER_ID, null, this);

        sp = (Spinner) findViewById(R.id.spinner1);
        adapterSpinner = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, setSpinnerTags());
        sp.setAdapter(adapterSpinner);
        sp.setOnItemSelectedListener(this);

    }



    //Set the tags names on the spinner
    private String[] setSpinnerTags() {
        ArrayList<String> result = new ArrayList<String>();
        while (cursor.moveToNext()) {
            String tagGet = cursor.getString(cursor.getColumnIndex(DbHandler.TAGS));
            if(!result.contains(tagGet)){
                result.add(tagGet);
            }
        }
        spData = new String[result.size()];
        for (int i = 0; i < result.size(); i++) {
            spData[i] = result.get(i);
        }
        return spData;
    }



    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position,
            long id) {

//HERE is the title of th tags 
        String theTitle = spData[position];

        //?????? What i do need the write here?

            switch (position) {
            case 0:

                break;

            default:
                break;
            }
    }


    @Override
    public void onNothingSelected(AdapterView<?> parent) {
    }



    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        return new CursorLoader(this, StatusProvider.CONTENT_URI, null, null, null, null);
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        adapter.swapCursor(data);

    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        adapter.swapCursor(null);

    }
    public void refreshList(){
        getLoaderManager().restartLoader(MY_LOADER_ID, null, this);
    }

}