Android Data Adapter

Last Update:2015-09-22 Source: Internet

Author: User

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Populate the specified view interface with complex data (arrays, linked lists, databases, collections, and so on). Arrayadapter (array adapter): used to bind some Single-format data, data sources: data or Collections.Private ListView ListView ; Private arrayadapter<string> Adapter ; Private Simpleadapter Simpleadapter; @Override protected void onCreate (Bundle Savedinstancestate) { Super. OnCreate (savedinstancestate);Setcontentview (r.layout. Activity_main); ListView= (ListView) Findviewbyid (r.id. ListView1); /*** Create a new data adapter* arrayadapter(context, The corresponding data source for each list item that is loaded by the current ListView , corresponding to the layout File) */string[] data={ "az","az1" }; Adapter= New arrayadapter<string> ( this , Android. R.layout.simple_list_item_1, data); //use View (listview) to load adapter ListView. Setadapter ( Adapter); }Simpleadapter (simple adapter): used to bind some format complex adapter, data source: can only be a specific generic Collection.Private ListView ListView ;Private Simpleadapter Simpleadapter ; /*** context: Contexts* data: datasource (specific generic Collection) list<? extends map<string, a List collection of?>> data a Map*, Each map corresponds to a row in the ListView list, and the Kay in each map must contain all the keys specified in the from* Key name in From:map* resource: layout file for list items* To: The ID in the bound data view, corresponding to the from */ DataList= New arraylist<map<string, object>> (); Simpleadapter=New Simpleadapter ( this, GetData (), R.layout.Activity_main , New string[]{"image", "text"}, New int[]{r.id.ImageView1 , R.id.TextView1}); ListView. Setadapter ( Simpleadapter);Private list<map<string, object>> getdata () { for (int i = 0; I <; i++) {map<string, object>map= New hashmap<string,object> ();Map.put ( "image", R.drawable.Ic_launcher);Map.put ( "text", "az" ); DataList. Add (map); } return DataList ; }A data adapter is a bridge between a linked data source and a view interface. Implementation Process: new Adapter--add data source to Adapter--view load adapter Android Data Adapter

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