android - getting object from SQlite database? -


im trying data database , have checked there data in table.

im getting error:

 process: com.example.olev.shoppinglist, pid: 4636     java.lang.outofmemoryerror: failed allocate 13571692 byte allocation 3197016 free bytes , 3mb until oom             @ java.util.arraylist.add(arraylist.java:118)             @ com.example.olev.shoppinglist.dbhandler.getproductsfromdb(dbhandler.java:63)             @ com.example.olev.shoppinglist.mainactivity.getproductsfromdb(mainactivity.java:66)             @ com.example.olev.shoppinglist.mainactivity.oncreate(mainactivity.java:39)             @ android.app.activity.performcreate(activity.java:5933)             @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1105)             @ android.app.activitythread.performlaunchactivity(activitythread.java:2251)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2360)             @ android.app.activitythread.access$800(activitythread.java:144)             @ android.app.activitythread$h.handlemessage(activitythread.java:1278)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5221)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:899)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:694)

my dbhandler:

public void oncreate(sqlitedatabase db) {         string query= "create table " + table_products + " ("+                 column_id + " integer primary key autoincrement," +                 column_productname + " text," +                 column_ischecked + " boolean" +                 ");";         db.execsql(query);     } public arraylist<product> getproductsfromdb(){         arraylist<product> products= new arraylist<>();         sqlitedatabase db=getwritabledatabase();         string query= "select * "+ table_products +";";          cursor c= db.rawquery(query,null);         c.movetofirst();         while (!c.isafterlast()){             if(c.getstring(c.getcolumnindex("productname"))!=null){                 product product=new product(integer.parseint(c.getstring(c.getcolumnindex(column_id))),column_productname,boolean.valueof(c.getstring(c.getcolumnindex(column_ischecked))));                 products.add(product);             }         }         db.close();         return products;     }

and main: 

arrayadapter<product> adapter;     arraylist<product> productnames=new arraylist<>();     dbhandler dbhandler;          @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         listview productlist=(listview)findviewbyid(android.r.id.list);          dbhandler=new dbhandler(this,null,null,1);         getproductsfromdb();         adapter= new customadapter(this,productnames);         productlist.setadapter(adapter);      }     public void getproductsfromdb() {             arraylist<product> products=dbhandler.getproductsfromdb();             productnames.addall(products);             adapter.notifydatasetchanged();     }

so sum getproductsfromdb() somehow producing error.

you forgot c.movetonext();. means read first row database again , again, , create same product again , again, , add list again , again forever, , out of memory error. this:

[...]  while (!c.isafterlast()){    if(c.getstring(c.getcolumnindex("productname"))!=null) {       product product=new product(integer.parseint(c.getstring(c.getcolumnindex(column_id))),column_productname,boolean.valueof(c.getstring(c.getcolumnindex(column_ischecked))));       products.add(product);    }    c.movetonext(); }

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