java - Use two ArrayAdapter in the same ListView -
i have these activities: coffeeactivity , drinkactivity
this main activity, has listview
public class calculationhistorylistactivity extends appcompatactivity { save savedata; listview listview; arraylist arraylistdrink,arraylistcoffee; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_calculation_history_list); // toasts test ad message on screen. remove after defining own ad unit id. // toast.maketext(this, toast_text, toast.length_long).show(); //sqlite database savedata = new save(calculationhistorylistactivity.this); //listview listview = (listview) findviewbyid(r.id.list); //coffee list arraylistcoffee = savedata.getallcoffeecalculation(); arrayadapter coffeearrayadapter = new arrayadapter(calculationhistorylistactivity.this, r.layout.list_view_item_coffee, r.id.total_money_coffee, arraylistcoffee); listview.setadapter(coffeearrayadapter); //drink list arraylistdrink = savedata.getalldrinkcalculation(); arrayadapter drinkarrayadapter = new arrayadapter(calculationhistorylistactivity.this, r.layout.list_view_item_coffee, r.id.total_money_drink,arraylist); listview.setadapter(drinkarrayadapter); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate menu; adds items action bar if present. getmenuinflater().inflate(r.menu.menu_calculation_history_list, menu); return true; } @override public boolean onoptionsitemselected(menuitem item) { // handle action bar item clicks here. action bar // automatically handle clicks on home/up button, long // specify parent activity in androidmanifest.xml. int id = item.getitemid(); if (id == r.id.action_settings) { return true; } return super.onoptionsitemselected(item); } } this database helper
public class save extends sqliteopenhelper { private static final string database_name = "my.db"; private static final string table = "mytable"; private static final string coffee = "coffee"; private static final string drink = "drink"; public save(context context) { super(context, database_name, null, 1); } @override public void oncreate(sqlitedatabase sqlitedatabase) { string query ; query = "create table " +table+ "(" +coffee+ " text, " +drink+ " text " + ")"; sqlitedatabase.execsql(query); } @override public void onupgrade(sqlitedatabase sqlitedatabase, int i, int i1) { sqlitedatabase.execsql(" drop file if exists " + table); oncreate(sqlitedatabase); } //this coffee section public boolean adddatabasetocoffee(int i){ sqlitedatabase sqlitedatabase = getwritabledatabase(); contentvalues contentvalues = new contentvalues(); contentvalues.put(coffee,i); long chaker = sqlitedatabase.insert(table,null,contentvalues); if (chaker == -1){ return false; }else { return true; } } //this drink section public boolean adddatabasetodrink(int i){ sqlitedatabase sqlitedatabase = getwritabledatabase(); contentvalues contentvalues = new contentvalues(); contentvalues.put(drink,i); long chaker = sqlitedatabase.insert(table,null,contentvalues); if (chaker == -1){ return false; }else { return true; } } //coffee public arraylist<string> getallcoffeecalculation() { arraylist<string> array_list = new arraylist<string>(); //hp = new hashmap(); sqlitedatabase db = this.getreadabledatabase(); cursor res = db.rawquery("select * " + table,null); res.movetofirst(); while(res.isafterlast() == false){ array_list.add(res.getstring(res.getcolumnindex(coffee))); res.movetonext(); } return array_list; } //drink public arraylist<string> getalldrinkcalculation() { arraylist<string> array_list = new arraylist<string>(); //hp = new hashmap(); sqlitedatabase db = this.getreadabledatabase(); cursor res = db.rawquery("select * " + table,null); res.movetofirst(); while(res.isafterlast() == false){ //array_list.add(res.getstring(res.getcolumnindex(drink))); res.movetonext(); } return array_list; } } my problem have 2 activities, , when use coffee or drink activity single time it's ok, if want use 2 activities both @ once, app crashes
my logcat
java.lang.nullpointerexception: attempt invoke virtual method 'java.lang.string java.lang.object.tostring()' on null object reference @ android.widget.arrayadapter.createviewfromresource(arrayadapter.java:401) @ android.widget.arrayadapter.getview(arrayadapter.java:369) @ android.widget.abslistview.obtainview(abslistview.java:3065) @ android.widget.listview.makeandaddview(listview.java:1945) @ android.widget.listview.filldown(listview.java:719) @ android.widget.listview.fillfromtop(listview.java:785) @ android.widget.listview.layoutchildren(listview.java:1735) @ android.widget.abslistview.onlayout(abslistview.java:2852) @ android.view.view.layout(view.java:17995) @ android.view.viewgroup.layout(viewgroup.java:5817) @ android.widget.linearlayout.setchildframe(linearlayout.java:1742) @ android.widget.linearlayout.layoutvertical(linearlayout.java:1585) @ android.widget.linearlayout.onlayout(linearlayout.java:1494) @ android.view.view.layout(view.java:17995) @ android.view.viewgroup.layout(viewgroup.java:5817) @ android.widget.framelayout.layoutchildren(framelayout.java:344) @ android.widget.framelayout.onlayout(framelayout.java:281) @ android.widget.scrollview.onlayout(scrollview.java:2537) @ android.view.view.layout(view.java:17995) @ android.view.viewgroup.layout(viewgroup.java:5817) @ android.widget.relativelayout.onlayout(relativelayout.java:1080) @ android.view.view.layout(view.java:17995) @ android.view.viewgroup.layout(viewgroup.java:5817) @ android.widget.framelayout.layoutchildren(framelayout.java:344) @ android.widget.framelayout.onlayout(framelayout.java:281) @ android.view.view.layout(view.java:17995) @ android.view.viewgroup.layout(viewgroup.java:5817) @ android.widget.linearlayout.setchildframe(linearlayout.java:1742) @ android.widget.linearlayout.layoutvertical(linearlayout.java:1585) @ android.widget.linearlayout.onlayout(linearlayout.java:1494) @ android.view.view.layout(view.java:17995) @ android.view.viewgroup.layout(viewgroup.java:5817) @ android.widget.framelayout.layoutchildren(framelayout.java:344) @ android.widget.framelayout.onlayout(framelayout.java:281) @ android.view.view.layout(view.java:17995) @ android.view.viewgroup.layout(viewgroup.java:5817)
your error coming inside adapter.
java.lang.nullpointerexception: attempt invoke virtual method 'java.lang.string java.lang.object.tostring()' on null object reference --> @ android.widget.arrayadapter.createviewfromresource(arrayadapter.java:401) --> @ android.widget.arrayadapter.getview(arrayadapter.java:369) --> @ android.widget.abslistview.obtainview(abslistview.java:3065) firstly, drink list empty... commented line
//array_list.add(res.getstring(res.getcolumnindex(drink))); and arraylist here?
arraylistdrink = savedata.getalldrinkcalculation(); arrayadapter drinkarrayadapter = new arrayadapter(calculationhistorylistactivity.this, r.layout.list_view_item_coffee, r.id.total_money_drink,arraylist); ^^^ and should drop table, not file...
sqlitedatabase.execsql(" drop file if exists " + table); if database worked, see nothing else wrong have. clear app data recreate database, fix these issues, should see list of drink values.
anyways, no cannot show 2 adapters in 1 listview.
you can add both columns of database 1 arraylist , display both in 1 adapter.
// coffee , drink public arraylist<string> getallcoffeecalculation() { arraylist<string> array_list = new arraylist<string>(); sqlitedatabase db = this.getreadabledatabase(); cursor res = db.rawquery("select * " + table,null); res.movetofirst(); while(res.isafterlast() == false){ string c = res.getstring(res.getcolumnindex(coffee)); string d = res.getstring(res.getcolumnindex(drink)); array_list.add(c + "\t" + d); res.movetonext(); } return array_list; } then, in activity.
savedata = new save(calculationhistorylistactivity.this); listview = (listview) findviewbyid(r.id.list); arraylistcoffee = savedata.getallcoffeecalculation(); arrayadapter<string> coffeearrayadapter = new arrayadapter<string>( calculationhistorylistactivity.this, android.r.layout.simple_list_item_1, arraylistcoffee); listview.setadapter(coffeearrayadapter);
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