Question

我从活动中获取数据，将其保存到sqlite db并在listview中显示。但我希望它以相反的顺序显示列表。这是我的列表视图查看活动。我无法理解我应该为逆序列表视图添加什么

编辑：我应该在哪里添加Collection.reverse（arraylist）;

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

        LISTVIEW = (ListView) findViewById(R.id.listView1);

        ID_Array = new ArrayList<String>();

        NAME_Array = new ArrayList<String>();

        PHONE_NUMBER_Array = new ArrayList<String>();

        sqLiteHelper = new SQLiteHelper(this);

        LISTVIEW.setOnItemClickListener(new AdapterView.OnItemClickListener()
        {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                // TODO Auto-generated method stub

                Intent intent = new Intent(getApplicationContext(),ShowSingleRecordActivity.class);

                intent.putExtra("ListViewClickedItemValue", ListViewClickItemArray.get(position).toString());

                startActivity(intent);

            }
        });

    }

    @Override
    protected void onResume() {

        ShowSQLiteDBdata() ;

        super.onResume();
    }

    private void ShowSQLiteDBdata() {

        sqLiteDatabase = sqLiteHelper.getWritableDatabase();

        cursor = sqLiteDatabase.rawQuery("SELECT * FROM "+SQLiteHelper.TABLE_NAME+"", null);

        ID_Array.clear();
        NAME_Array.clear();
        PHONE_NUMBER_Array.clear();

        if (cursor.moveToFirst()) {
            do {

                ID_Array.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.Table_Column_ID)));

                //Inserting Column ID into Array to Use at ListView Click Listener Method.
                ListViewClickItemArray.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.Table_Column_ID)));

                NAME_Array.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.Table_Column_1_Name)));

                PHONE_NUMBER_Array.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.Table_Column_2_PhoneNumber)));


            } while (cursor.moveToNext());
        }

        listAdapter = new ListAdapter(DisplaySQLiteDataActivity.this,

                ID_Array,
                NAME_Array,
                PHONE_NUMBER_Array
        );

        LISTVIEW.setAdapter(listAdapter);

        cursor.close();
    }
}

Answer 1

只需修改您的代码，如下所示：

Collections.reverse(ID_Array);
Collections.reverse(NAME_Array);
Collections.reverse(PHONE_NUMBER_Array);
listAdapter = new ListAdapter(DisplaySQLiteDataActivity.this,    
                ID_Array,
                NAME_Array,
                PHONE_NUMBER_Array
        );    
LISTVIEW.setAdapter(listAdapter);

这就是你需要的，这样你的列表甚至可以在初始化适配器之前被反转，然后你的适配器将具有相反的值，这基本上意味着一个反转的适配器。

自定义列表视图的顺序相反

1 个答案: