I don't see any errors and the debug is not very useful. How can I fix that error?
This is part of the code and the error appears inside the last line
Thanks in advance!
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_selfie_list);
mMatrixCursor = new MatrixCursor(new String[]{"_id","_data","_details"});
ListView lVThumbnail = (ListView) findViewById(R.id.selfie_list_layout);
mAdapter = new SimpleCursorAdapter(
getBaseContext(),
R.layout.activity_selfie_list,
null,
new String[] { "_data","_details"} ,
new int[] { R.id.img_thumbnail,R.id.tv_details},
0
);
lVThumbnail.setAdapter(mAdapter);
And this are the layouts used, the first one is the list fragment (since I use a list and detailed fragments), and the second is the list layout. :
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/selfie_list"
android:name="com.lordpato.dailyselfie.SelfieListFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
tools:context="com.lordpato.dailyselfie.SelfieListActivity"
tools:layout="#layout/lv_layout" />
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:id="#+id/selfie_list_layout"
android:layout_height="75dp" >
<ImageView
android:id="#+id/img_thumbnail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:adjustViewBounds="true"
android:padding="5dp"
/>
<TextView
android:id="#+id/tv_details"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/img_thumbnail"
android:padding="5dp"
/>
</RelativeLayout>
selfie_list_layout is not a ListView.
ListView lVThumbnail = (ListView) findViewById(R.id.selfie_list_layout);
...
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:id="#+id/selfie_list_layout"
android:layout_height="75dp" >
Related
Have a DashBoardActivity that extends a custom MainActivity but i get NullPointerException when trying to access certain views from the DashBoardActivity. Any idea why this could be happening or something am not seeing here?. Thanks
MainActivity:
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.dashboard_layout);
linearlayout = (LinearLayout)findViewById(R.id.footer_container_id);
actionlayout = (LinearLayout)findViewById(R.id.actionbar_container_id);
mainboard = (ImageView)findViewById(R.id.image_dashboard_id);
dashboard = (ImageView)findViewById(R.id.image_comparison_id);
graph = (ImageView)findViewById(R.id.image_graph_id);
contact = (ImageView)findViewById(R.id.image_contact_id);
actionbar = getSupportActionBar();
actionbarView = getLayoutInflater().inflate(R.layout.actionbar, null);
actionbar.setCustomView(actionbarView, new ActionBar.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
actionbar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
}
public void setSelectedDashBoard(){
mainboard.setSelected(true);
}
DashBoardActivity:
public class DashBoardActivity extends MainActivity implements OnClickListener {
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
int orientation = getResources().getConfiguration().orientation;
sessionmanager = new SessionManager(this);
prefs = getSharedPreferences(PREFS_NAME,0);
String cached_username = prefs.getString(USERNAME, "");
mainboard.setSelected(true); // NullPointerException here.
dashboard_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:orientation="horizontal"
android:id="#+id/footer_container_id"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
<include layout="#layout/footer"></include>
</LinearLayout>
<FrameLayout
android:id="#+id/dashboard_fragment_container_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#id/footer_container_id"
android:layout_alignParentTop="true">
</FrameLayout>
</RelativeLayout>
part of footer.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/layout_footer_id" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:layout_alignParentBottom="true"
android:background="#292929" android:orientation="horizontal">
<LinearLayout android:id="#+id/ytd_container_id"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_weight="1" android:orientation="vertical">
<ImageView android:id="#+id/image_dashboard_id"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center" android:src="#drawable/footer_icons_ytd" />
<TextView android:id="#+id/ytd_text_id" android:layout_width="match_parent"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_marginBottom="5dp" android:layout_marginLeft="5dp"
android:clickable="false" android:paddingLeft="10dp" android:text="Year to Date"
android:textColor="#FFFFFF" android:textSize="10sp">
</TextView>
"
</LinearLayout>
Update
if i use the method setSelectedDashBoard() instead, which i just added from the MainActivity class, i don't get the NullPointerException. don't understand it..
dashboard = (ImageView)findViewById(R.id.image_comparison_id);
the only reason for dashboard to be null is R.id.image_comparison_id does not belongs to R.layout.dashboard_layout
It looks like a typical error of subclass member variable obscuration. You should check if you re-declared the variable dashboard in DashBoardActivity. The subclass is just substituting the inherited variable with a local one which is not initialised.
It is the character " , unless it is a typo.
</TextView>
**"**
</LinearLayout>
I am having problems with ListView on android. I have an Activity with an EditText view and a button. The idea is user should enter some info in the EditText field, touch the Search button which retrieves a list from a web service that it is displayed in the same activity below the EditText and the Button. Everything fine, I got the data from Internet but items weren't displaying. I was using the notifyDataSetChanged(). After a couple of hours with no success, I decided trying to put some items manually and it turns out that again nothing was displayed, hence I think I am doing something wrong when I am trying to set the listview and the adapter. So here is the code..
the xml of the activity activity_search.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="5dp">
<EditText
android:id="#+id/edit_search"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="5"
android:inputType="text"
android:hint="Enter info"
android:ems="10" >
<requestFocus />
</EditText>
<Button
android:id="#+id/button_search"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#android:drawable/ic_menu_search"
android:contentDescription="Search"
android:ems="10" />
</LinearLayout>
<ListView
android:id="#+id/listview_items"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawSelectorOnTop="false" />
The XML of the item row.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_margin="5dp">
<TextView
android:id="#+id/row_code"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/Common_TextContent"
android:textAppearance="#android:style/TextAppearance.Holo.Medium" />
<TextView
android:id="#+id/row_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="#string/Common_TextContent"
android:textAppearance="#android:style/TextAppearance.Holo.Small" /></LinearLayout>
the custom Adapter:
public class ItemsListAdapter extends ArrayAdapter<ItemsList> {
private int[] colors = new int[] { 0x30ffffff, 0x30808080 };
public AssetListAdapter(Context context,
List<ItemsList> itemsList) {
super(context, 0, itemsList);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.row, null);
}
convertView.setBackgroundColor(colors[position % colors.length]);
TextView code = (TextView) convertView.findViewById(R.id.row_code);
code.setText(getItem(position).getCode());
TextView name = (TextView) convertView.findViewById(R.id.row_name);
name.setText(getItem(position).getName());
return convertView;
}
and the onCreate method on the Activity
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
_listView = (ListView) findViewById(R.id.listview_items);
_listItems = new ArrayList<ItemsList>();
_listItems.add(new ItemsList ("cosa1", "cosa1", "cosa1", "cosa1"));
_listItems.add(new ItemsList ("cosa2", "cosa2", "cosa2", "cosa2"));
_listItems.add(new ItemsList ("cosa3", "cosa3", "cosa3", "cosa3"));
_adapter = new ItemsListAdapter(this, _listItems);
_listView.setAdapter(_adapter);
}
The ItemsList is just an Object with 4 strings with all the getters implemented.
When I debug in the getView method of the Adapter, the view (convertView) is created and it has the right information. It is just that is not showing those in the screen. What am I doing wrong?
Thanks...
Your second LinearLayout has a height of match_parent. Try wrap_content instead.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp">
I try to do simplest listView. I create layout:
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/history_menu_item"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:padding="60dp" >
</TextView>
And ListActivity:
public class HistoryMenu extends ListActivity {
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
String[] values = new String[] { "Edit", "Send" };
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
R.layout.history_menu, values);
setListAdapter(adapter);
}
}
Element of listView highlight not fully, only where text.
How to fix it?
Use this as your list item layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/history_menu_item"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:padding="60dp" >
</TextView>
</LinearLayout>
Make changes in Textview
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/history_menu_item"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:padding="60dp" />
I'm stumped as to how to properly implement an adapter that can pull a column of data from my sqlite database and add it to a listview (based on the android-provided multiple checkbox). All of the existing examples use the following:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String[] myList = new String[] {"Hello","World","Foo","Bar"};
ListView lv = new ListView(this);
lv.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,myList));
setContentView(lv);
}
However, I don't want a string. Here's my code:
public class ListGroups extends Activity {
/** Called when the activity is first created. */
private ExpensesDbAdapter mDBHelper;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view);
ListView lv = (ListView)findViewById(R.id.list1);
mDBHelper = new ExpensesDbAdapter(ListGroups.this);
mDBHelper.open();
Cursor c = mDBHelper.fetchAllGroups();
startManagingCursor(c);
String[] from = new String[] {ExpensesDbAdapter.KEY_GROUPNAME};
int[] to = new int[] {R.id.groupname};
ListAdapter ladapter = new SimpleCursorAdapter(ListGroups.this, R.layout.grouprow, c, from, to);
lv.setAdapter(ladapter);
lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
}
}
Here's the view.xml file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center">
<TextView android:id="#+id/header01"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:text="Select Groups"/>
<ListView
android:id="#+id/list1"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/footerbutton01"
android:text="Get Expense Reports" />
</LinearLayout>
And, because the SimpleCursorAdapter asks for it, here's the grouprow.xml:
<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/groupname"
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:textAppearance="?android:attr/textAppearanceLarge"
android:gravity="center_vertical"
android:checkMark="?android:attr/listChoiceIndicatorMultiple"
android:paddingLeft="6dip"
android:paddingRight="6dip"/>
If I use a ListActivity and don't invoke the layout on Creation, I can get it to work, but I need the wrappers around that ListView, and I can't make the .addHeader and .addFooter methods work for me. Any help on creating the proper adapter would be appeciated.
Answered it with some help. Several things were wrong, mostly in the list.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center">
<TextView android:id="#+id/header01"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:text="Select Groups"/>
<ListView
android:id="#android:id/android:list"
android:layout_width="match_parent"
android:layout_height="wrap_around"
android:layout_weight="1" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/footerbutton01"
android:text="Get Expense Reports" />
</LinearLayout>
This allows you to tie the ListView to that element in the xml. You don't have a name for it, but you can use getListView() in the onCreate method to access it.
I have an app whose main class extends ListActivity:
public class GUIPrototype extends ListActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Cursor c = managedQuery(People.CONTENT_URI, null, null, null, null);
String[] from = new String[] {People.NAME};
int[] to = new int[] { R.id.row_entry };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,R.layout.drawer,c,from,to);
setListAdapter(adapter);
getListView().setTextFilterEnabled(true);
}
}
I have a sliding drawer included in my XML, and I'm trying to get a separate listview to appear in the sliding drawer. I'm trying to populate the second listview using an inflater:
View inflatedView = View.inflate(this, R.layout.main, null);
ListView namesLV = (ListView) inflatedView.findViewById(R.id.content);
String[] names2 = new String[] { "CS 345", "New Tag", "Untagged" };
ArrayAdapter<String> bb = new ArrayAdapter<String>(this, R.layout.main, R.id.row_entry, names2);
namesLV.setAdapter(bb);
This compiles, and runs, but the slidingdrawer is completely blank. My XML follows:
<SlidingDrawer
android:id="#+id/drawer"
android:handle="#+id/handle"
android:content="#+id/content"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_gravity="bottom">
<ImageView
android:id="#id/handle"
android:layout_width="48px"
android:layout_height="48px" android:background="#drawable/icon"/>
<ListView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#id/content"/>
</SlidingDrawer>
I feel like I'm missing a vital step. I haven't found any resources on my problem by Googling, so any help would be greatly appreciated.
Edit: This was for a problem a long time ago, and the solution I found was to just redesign my layout. I am unable to accept an answer as I don't have the means to test them.
I Suppose I might have found the solution.
All these above solutions did not worked for me.
But then, what I did was add onClickListener to actual view which I return from adapter and BAM it started working for me.
Here is the sample code:
May layout XML (Not complete one....)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/details"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<ScrollView
android:id = "#+id/scrolling"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:paddingBottom="30dip"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/listingIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"/>
............
</ScrollView>
<SlidingDrawer
android:id="#+id/slidingDrawerShowMore"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:topOffset="132dip"
android:handle="#+id/handle"
android:content="#+id/content">
<LinearLayout
android:id="#+id/handle"
android:padding = "5dip"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#android:color/black">
<TextView
android:id="#+id/title"
android:layout_alignParentRight="true"
android:textSize="14dp"
android:layout_below="#id/rate"
android:singleLine="true"
android:textColor="#3F48CC"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/show_more"/>
</LinearLayout>
<LinearLayout
android:id="#id/content"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical" android:gravity="center"
android:background="#android:color/black">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center_vertical"
android:background="#drawable/dark_header">
<TextView
android:id="#+id/otherTitle"
android:layout_alignParentRight="true"
android:layout_below="#id/rate"
android:singleLine="true"
android:textSize="21px"
android:paddingLeft="10px"
android:textColor="#EBEBEB"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:layout_weight="0.6"
android:text="#string/someString"/>
<ProgressBar
android:id="#+id/pbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#android:style/Widget.ProgressBar.Small"
android:layout_gravity="center_vertical"/>
</LinearLayout>
<ListView
android:id="#+id/listview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
</SlidingDrawer>
</RelativeLayout>
Now to handle click events all I had to do was to add onClickListener in my adapter
public View getView(int position, View convertView, ViewGroup parent) {
convertView.setOnClickListener(this);
}
That's it. Problem is I could not get my onItemClickListener working for this ListView. But right now on click listener works for me. One day I would love to find out reason behind this.
It looks like the problem could be that you are inflating a new instance of a ListView rather than using the one in your view.
Try getting the ListView with ListView listView = (ListView) findViewById(R.id.content);
Then apply your adapter to it.
Have you tried
View inflatedView = View.inflate(this, R.layout.main, null);
SlidingDrawer sliding=(SlidingDrawer) inflatedView.findViewById(R.id.drawer);
ListView namesLV = (ListView) sliding.findViewById(R.id.content);