java - How to put a ListView into a Fragment -
i'm trying put listview in fragment, app crash. followed this guide learn how put listview in activity, want put in fragment changed code bit. fragment:
public class faqfragment extends fragment {
public static fragment newinstance() { faqfragment fragment = new faqfragment(); bundle args = new bundle(); fragment.setarguments(args); return fragment; } private listview listview1; @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { view v = inflater.inflate(r.layout.fragment_faq, container, false); element element_data[] = new element[] { new element(r.drawable.goccia, "goccia1"), new element(r.drawable.goccia, "goccia2"), new element(r.drawable.goccia, "goccia3"), new element(r.drawable.goccia, "goccia4"), new element(r.drawable.goccia, "goccia5") }; elementadapter adapter = new elementadapter(getactivity(), android.r.layout.simple_list_item_1, element_data); listview1 = (listview)v.findviewbyid(r.id.listview1); view header = (view)getlayoutinflater(savedinstancestate).inflate(r.layout.element, null); listview1.addheaderview(header); listview1.setadapter(adapter); return v; } this arrayadapter:
public class elementadapter extends arrayadapter<element>{ fragmentactivity context; int layoutresourceid; element data[] = null; public elementadapter(fragmentactivity fragmentactivity, int layoutresourceid, element[] data) { super(fragmentactivity, layoutresourceid, data); this.layoutresourceid = layoutresourceid; this.context = fragmentactivity; this.data = data; } @override public view getview(int position, view convertview, viewgroup parent) { view row = convertview; weatherholder holder = null; if(row == null) { layoutinflater inflater = ((fragmentactivity)context).getlayoutinflater(); row = inflater.inflate(layoutresourceid, parent, false); holder = new weatherholder(); holder.imgicon = (imageview)row.findviewbyid(r.id.imgicon); holder.txttitle = (textview)row.findviewbyid(r.id.txttitle); row.settag(holder); } else { holder = (weatherholder)row.gettag(); } element element = data[position]; holder.txttitle.settext(element.title); holder.imgicon.setimageresource(element.icon); return row; } static class weatherholder { imageview imgicon; textview txttitle; } }
and element:
public class element { public int icon; public string title; public element(){ super(); } public element(int icon, string title) { super(); this.icon = icon; this.title = title; } }
the app has 3 tabs, app crash when swipe tab code i've wrote (fragment).
in logcat there error:
03-13 11:25:39.455: e/androidruntime(2840): @ com.example.bluhackathon.elementadapter.getview(elementadapter.java:47)
i tried delete lines 47, 48 , 49 of arrayadapter , app didn't crash (of course there list empty elements.
lines 47, 48, 49:
element element = data[position]; holder.txttitle.settext(element.title); holder.imgicon.setimageresource(element.icon);
you can use listfragment implement it, below answer implement "put listview fragment, , data mysql", wrote yesterday , hope can solve problem.
package com.ecnu.vendingmachine; import java.util.arraylist; import java.util.hashmap; import java.util.list; import org.apache.http.namevaluepair; import org.json.jsonarray; import org.json.jsonexception; import org.json.jsonobject; import android.app.listfragment; import android.app.progressdialog; import android.os.asynctask; import android.os.bundle; import android.util.log; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.listview; import android.widget.simpleadapter; import com.ecnu.vendingmachine.widgets.jsonparser; public class vendingfragment extends listfragment { private string tag = "vendingfragment"; private static final string tag_success = "success"; private listview listview; // progress dialog private progressdialog pdialog; // creating json parser object jsonparser jsonparser = new jsonparser(); jsonarray vendingmachine = null; arraylist<hashmap<string, string>> vendinglist; // url products list mainactivity main = new mainactivity(); private string url_all_vendingmachine = main.getip() + "vendingmachine/get_all_vendingmachine.php"; // products jsonarray @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { return inflater.inflate(r.layout.vending_main, container, false); } @override public void onviewcreated (view view, bundle savedinstancestate) { vendinglist = new arraylist<hashmap<string, string>>(); //listview = (listview) view.findviewbyid(r.id.list); listview = getlistview(); new get_all_vendingmachine().execute(); } class get_all_vendingmachine extends asynctask<string, string, string> { /** * before starting background thread show progress dialog * */ @override protected void onpreexecute() { super.onpreexecute(); pdialog = new progressdialog(getactivity()); pdialog.setmessage("creating product.."); pdialog.setindeterminate(false); pdialog.setcancelable(true); pdialog.show(); log.i(tag, "pdialog"); } protected string doinbackground(string... args) { // building parameters list<namevaluepair> params = new arraylist<namevaluepair>(); log.i(tag, url_all_vendingmachine); // getting json object // note create product url accepts post method jsonobject json = jsonparser.makehttprequest( url_all_vendingmachine, "get", params); // check log cat response log.i(tag, json.tostring()); // check success tag try { int success = json.getint(tag_success); if (success == 1) { // ada record data (success = 1) // getting array of vendingmachine vendingmachine = json.getjsonarray("vendings"); // looping through vendingmachine (int = 0; < vendingmachine.length(); i++) { jsonobject c = vendingmachine.getjsonobject(i); // storing each json item in variable string id = c.getstring("vmid"); string name = c.getstring("name"); string address = c.getstring("address"); log.i(tag, id); log.i(tag, name); log.i(tag, address); // creating new hashmap hashmap<string, string> map = new hashmap<string, string>(); // adding each child node hashmap key => value map.put("vmid", id); map.put("name", name); map.put("address", address); // adding hashlist arraylist vendinglist.add(map); } } else { // failed create product getactivity().finish(); } } catch (jsonexception e) { e.printstacktrace(); } return null; } /** * after completing background task dismiss progress dialog * **/ protected void onpostexecute(string file_url) { // dismiss dialog once done pdialog.dismiss(); getactivity().runonuithread(new runnable() { @override public void run() { // updating listview // hashmap<string, string>ä¸çš„key string[] = { "name", "address", "vmid" }; // list_item.xmlä¸å¯¹åº”的控件id int[] = { r.id.vending_name, r.id.vending_address, r.id.vending_id }; log.i(tag, from[0]); simpleadapter adapter = new simpleadapter(getactivity(), vendinglist, r.layout.vending_list, from, to); listview.setadapter(adapter); } }); } } } the vending_main_xml:
<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@color/whitecolor" > <include android:id="@+id/layout_buy_title_actionbar" layout="@layout/headbar_title" /> <listview android:id="@id/android:list" android:layout_below="@id/layout_buy_title_actionbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:cachecolorhint="@android:color/transparent" android:divider="@drawable/reader_item_divider" android:listselector="@android:color/transparent" > </listview> </relativelayout> the vending_list.xml:
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="@dimen/selectvmlistcell_height" android:orientation="vertical" > <relativelayout android:layout_width="fill_parent" android:layout_height="@dimen/selectvmlistcell_height" android:layout_gravity="center_vertical" android:background="@drawable/bg_listview" android:gravity="center_vertical" android:paddingleft="@dimen/layout_margin_10" > <linearlayout android:id="@+id/imagetypelayout" android:layout_width="@dimen/smallimage_hw_45" android:layout_height="fill_parent" android:layout_alignparentleft="true" android:layout_centervertical="true" android:gravity="center_vertical" android:orientation="vertical" > <imageview android:id="@+id/vendingimage" style="@style/smallimagestyle" android:src="@drawable/buy_main_not_shop" /> <textview android:id="@+id/distancetext" style="@style/smalltxtstyle" android:layout_gravity="center_horizontal" android:gravity="center" android:singleline="true" android:textcolor="@color/lightorangecolor" /> </linearlayout> <relativelayout android:id="@+id/vendingsave" android:layout_width="47.0dip" android:layout_height="fill_parent" android:layout_alignparentright="true" android:layout_centervertical="true" > <imageview android:id="@+id/vendingsaveimage" android:layout_width="27.0dip" android:layout_height="27.0dip" android:layout_centerinparent="true" android:layout_centervertical="true" android:background="@drawable/bg_favor_btn" /> </relativelayout> <linearlayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_centervertical="true" android:layout_marginleft="@dimen/layout_margin_10" android:layout_toleftof="@id/vendingsave" android:layout_torightof="@id/imagetypelayout" android:gravity="center_vertical" android:orientation="vertical" > <textview android:id="@+id/vending_name" style="@style/middarkgraytxtstyle" android:layout_width="fill_parent" /> <textview android:id="@+id/vending_address" style="@style/smalllightgraytxtstyle" android:layout_width="fill_parent" android:maxlines="2" /> <linearlayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <textview style="@style/smalllightgraytxtstyle" android:text="number：" /> <textview android:id="@+id/vending_id" style="@style/smalllightgraytxtstyle" /> </linearlayout> </linearlayout> </relativelayout> </linearlayout> hope can find how put listview fragment. element in listview complex, if want single row, it's more simple code.
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