Android :: Cannot Understand NullPointerException With Custom Adapter
Apr 28, 2010
I am trying to create a list view which as TextView that can display html content , an WebView and other basic TextViews.I tried to extend SimpleAdapter but i struck with the problem ,I will be glad if someone can point out the mistake i am doing.
In onCreate method:
CODE:.............
And my row.xml file looks like:
CODE:.............
The error i was getting was:
CODE:..................................
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Jun 12, 2009
I created a custom SurfaceView called CaptureView and tried to add it into main.xml file.The application seems to work fine but if I switch from main.xml tab to Layout in Eclipse the text NullPointerException appears instead of layout preview.Does anyone know how this issue could be solved?
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Jun 18, 2010
I have seen examples implementing a custom Filter. The Android developer docs talk about implementing a Filterable interface. Does anyone have any advice and/or sample code on the best way to implement filtering in a ListView ?
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Jun 8, 2010
I cannot for the life of me figure out why I'm getting a NullPointerException.
When a user clicks on a particular image, a dialog window is supposed to pop-up and display a larger version of said image:
CODE:..............
The associated onCreateDialog looks like this:
CODE:.........
For reference, this is cover_dialog.xml:
CODE:....................
Now, when the image previously described is clicked, the application immediately crashes and throws the following error through LogCat:
CODE:......................
The line in question refers to this line inside of onCreateDialog:
coverLarge.setImageBitmap(book.getCover());
I don't get why coverLarge is null at that point.
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Jan 31, 2010
How do I set row height if text of some rows more than one line when writing custom ArrayAdapter?
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Feb 25, 2010
I have a custom adapter for an arraylist.
CODE:...........
But when i try to access to the progress bar in the adapter
CODE:............
It always return null, like it doesn't find the progress bar. However, the progress bar is shown in the list, but i need to access to it inside the adapter.
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Jun 7, 2010
I seem to be having trouble with the linkify I am using in my Custom Adapter. For some reason I recieve the following stack track when I click on one of the links:
CODE:......
Here is the code that is calling it:
CODE:.......
I understand what the error is saying but I am not sure how to fix it.
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Jan 31, 2009
I want to create custom View showing possibly several items. i think using Adapter interface would be good idea.
My question is: should i extend AdapterView? if so, what is the most imortant when doing this (e.g. AdapterView is ViewGroup, so how should i manage children)?
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May 25, 2010
I have a Custom Cursor Adapter. It shows a list of installed applications with an icon, name and checkbox on each line item. I cache the list of applications in a database for faster retrieve and to store the state of the checkbox. However, I can't store the application icon in the db because sqlite doesn't support blobs. They list works rather well except that it is "janky" as described by Brad Fitzpatrick at Google IO (https://wave.google.com/wave/waveref/ googlewave.com/w+3kgmObZwO ). I'm trying to make my app non-janky by following the tutorial here: [url]... but I'm having trouble.
The reason my list is janky is because I look up each icon as you scroll down the list. drawable = pm.getApplicationIcon(c.getString(c.getColumnIndex(SmartLockDbAdapter.KEY_PACKAGE)));
getApplicationIcon takes too long to return to make for a smooth scrolling list. I would like to perform the action in the background with an AsyncTask but because bindView gets called repeatedly in a short time span, my icons end up with the wrong list item. I need help.
I've posted my whole ListActivity below in hopes that it helps other people. It's much harder to find an example of a working CursorAdapter then it is an ArrayAdapter.
CODE:........................
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Aug 4, 2010
I have a listview with a custom arrayadapter that handles about 15 strings. The style of each row alternates (between labels and values for those labels--for example row 1 could be "email address" and row 2 would be the actual email address). I'm changing the style of each row to alternate like this in the arrayadapter's getView() method. So if the item at the current position is a label, I'll change the styling from the default row style (which is what the values have applied to them). When the listview first loads, the styling is perfect and just how I want it to be. If I scroll the list slowly up or down, it stays that way. However, if I scroll the list fast up and down, the styling of the value rows starts changing to that of the label ones until all of the rows have the styling of a label row. I've used custom adapters on other listviews in the app with no problems like this. Found out that it also changes all of the rows to the label styling on portrait->landscape orientation changes. Doesn't do this on landscape->portrait changes. Below is the adapter I'm using.
public class DetailsAdapter extends ArrayAdapter<String> { private TextView text = null; private String item = null;
public DetailsAdapter(Context context, int resource, int textViewResourceId, String[] objects) { super(context, resource, textViewResourceId, objects);
} @Override public View getView(int position, View convertView, ViewGroup parent) { text = (TextView) super.getView(position, convertView, parent); item = getItem(position);
if (item.equals("Name") || item.equals("Mobile") || item.equals("Home") || item.equals("Email") || item.equals("Address")) { text.setBackgroundColor(0xFF575757); text.setTextSize(15);
text.setTypeface(null, Typeface.BOLD); text.setPadding(8, 5, 0, 5);
} else { text.setPadding(15, 15, 0, 15); } return text;
} @Override public boolean isEnabled(int position) { item = getItem(position);
if (item.equals("Name") || item.equals("Mobile") || item.equals("Home") || item.equals("Email") || item.equals("Address")) { return false;
} else { return true; } } }
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Jul 1, 2010
I'm making a custom adapter so that I can display a list of items with icons which looks like the menu that comes up when you long click the home screen. For some reason though the list items are not clickable. The can be navigated to with the D-pad but they cannot be clicked in any way. I thought maybe the problem was with the AlertDialog I was using so I replaced a working adapter I had elsewhere but I have the same issue there. My adapter looks like this:
ArrayList<IconListItem> mItems; LayoutInflater mInflater;
public IconListAdapter(Context context, ArrayList<IconListItem> items) {
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mItems = items;
} public IconListAdapter(Context context) {
this(context, new ArrayList<IconListItem>());
} public void add(IconListItem item) { mItems.add(item);
notifyDataSetChanged(); return item;
} public void remove(IconListItem item) { mItems.remove(item); notifyDataSetChanged();
} @Override public int getCount() { return mItems.size();
} @Override public IconListItem getItem(int position) { return mItems.get(position);
} @Override public long getItemId(int position) { return position;
} @Override public View getView(int position, View convertView, ViewGroup parent) { View view;
if(convertView == null){ view = mInflater.inflate(R.layout.two_line_icon_list_item, null);
} else { view = convertView; } IconListItem item = mItems.get(position);
TextView lineOne = (TextView) view.findViewById(R.id.firstLine);
TextView lineTwo = (TextView) view.findViewById(R.id.secondLine);
ImageView iconImage = (ImageView) view.findViewById(R.id.icon);
lineOne.setVisibility(View.VISIBLE); lineTwo.setVisibility(View.VISIBLE);
iconImage.setVisibility(View.VISIBLE); lineOne.setText(item.getText());
if (item.getSubtext() == null) lineTwo.setVisibility(View.GONE);
else lineTwo.setText(item.getSubtext());
if (item.getIcon() == null) iconImage.setVisibility(View.GONE);
else iconImage.setImageDrawable(item.getIcon());
return view; }
And the XML it's inflating:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="6dip" >
<ImageView android:id="@+id/icon" android:layout_width="wrap_content"
android:layout_height="fill_parent" android:layout_marginRight="6dip" />
<LinearLayout android:orientation="vertical" android:layout_width="wrap_content"
android:layout_weight="1" android:layout_height="fill_parent" >
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content"
android:layout_weight="1"android:gravity="center_vertical"
android:id="@+id/firstLine" android:ellipsize="marquee" android:inputType="text" />
<TextView android:layout_width="wrap_content" android:layout_height="0dip"
android:layout_weight="1" android:ellipsize="marquee"
android:id="@+id/secondLine" android:inputType="text" />
</LinearLayout> </LinearLayout>
When I say they are not clickable, I mean that they items do not highlight in orange when I press them nor does onItemClick ever get called. In my code I have this, a different adapter for another purpose and it works perfectly
this.foos= foos; fa = new FooAdapter(this.foos); fooList.setAdapter(fa);
// View the details for an item when it is selected
fooList.setOnItemClickListener(new OnItemClickListener() {
@Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
Intent i = new Intent(MyActivity.this, MyOtherActivity.class);
i.putExtra("foo", ((fooAdapter)arg0.getAdapter()).getItem(arg2));
i.putExtra("list_position", arg2);
MyActivity.this.startActivityForResult(i, 0);
} } );
But when I swap out the first 3 lines for
IconListAdapter ila = new IconListAdapter(this);
ila.add(0, "Test 1", android.R.drawable.ic_menu_mylocation);
ila.add(0, "Test 2", android.R.drawable.ic_menu_edit);
ila.add(0, "Test 3", android.R.drawable.ic_menu_search);
groupList.setAdapter(ila);
I t stops working.
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Dec 7, 2009
I have implemented a custom adapter the extends from the BaseAdapter and implements the getView method. It works fine except for one thing, not once do I get the convert View (a parameter to the getView method) that is not null (that can be reused).
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Jun 29, 2009
I been using custom adapters based on the BaseAdapter and I usually populate my data at the getView() funtion.
Now I'm trying to write my custom adapter for my database cursor which now will be based on a CursorAdapter.
I'm getting confused where I should do the populating work? Along with how do I implement my inflating and populating "smart/efficient code based on RomainGuy presentation."
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Nov 1, 2010
I have a listView using a custom adapter. Each row contains a button and some other Views. I want to be able to click either on the button, or on the row itself (to edit the item of the list that is clicked).
Setting an onItemClickListener in the activity won't work because of this problem
I think I have to set an onClickListener in the getView() method of my adapter for it to work properly.
I would like to use my activity's onClickListener, in order to use a startActivityForResult() when the row is clicked, in order to have something returned to my activity when the item edition activity is over.
How can I do that?
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Sep 10, 2010
I have a custom list adapter contains a layout with controls in it. I was wondering how I can get each individual controls id? I am planning on changing the color of some textviews. code...
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Mar 25, 2010
I have a ListView with a custom Adapter that extends ArrayAdapter. It's ArrayAdapter of Type Artist. (There are about 1200 artists in my list). Artist is a very small class that has a name and an id. The Artist Class has toString() overridden to return just the name. I have an EditText. The EditText has an TextChangeListener where I call .getFilter().filter(chars, callback) on my adapter. In the Filter.Filterlistener().onComplete() callback i print the count and it looks really good. As i type the count decreases. So it seams everything works as advertised, but the List stays the same. I tried to call artistAdapter.notifyDataSetChanged() to force the list to redraw, but nothing happens. [see 2.)]. I am tinkering around for days now! I am desperate. Hopefully someone can have a look on my code and tell me what I am doing wrong! How can I force the list to be redrawn?
Here is what I have done:
1.) Defined a ListView and an EditText like this:
<EditText xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_search_text"
android:layout_width="fill_parent"
android:layout_height="35dip"
android:layout_below="@id/header">
</EditText>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_search"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ListView>
2.) Setup my ListView in the Activities onCreate():
private ListView listView = null;
private ArtistAdapter artistAdapter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_artists);
artistAdapter = new ArtistAdapter(this, R.layout.row, list); // 'list' is an ArrayList<Artist>
listView = (ListView) findViewById(R.id.list_search);
listView.setAdapter(artistAdapter);
listView.setFastScrollEnabled(true);
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> av, View v, int position, long id) {
// do something } });
EditText txtSearch = (EditText) findViewById(R.id.list_search_text); txtSearch.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable arg0) { }
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { }
public void onTextChanged(CharSequence chars, int start, int before, int count) {
artistAdapter.getFilter().filter(chars, new Filter.FilterListener() {
public void onFilterComplete(int count) {
Log.d(Config.LOG_TAG, "filter complete! count: " + count);
artistAdapter.notifyDataSetChanged();
}});
}});
}
3.) This is my ArtistAdapter in short. I added an remove() and add() method:
public class ArtistAdapter extends ArrayAdapter<Artist> implements SectionIndexer {
private List<Artist> items;
/* other stuff like overridden getView, getPositionForSection,
getSectionForPosition and so on */
@Override
public void remove(Artist object) {
super.remove(object);
items.remove(object);
}
@Override
public void add(Artist object) {
super.add(object);
items.add(object);
} }
4.) My artist has also the toString() overridden:
public class Artist implements Comparable<Artist> {
public String uid;
public String name;
public Artist(String id, String name) {
this.uid = id;
this.name = name; }
public int compareTo(Artist another) {
return this.name.compareToIgnoreCase(another.name);
}
@Override
public String toString() {
return this.name;
} }
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Jun 2, 2009
I developed a List View with a custom adapter (which extends Array Adapter). The problem is that i can't selected or highlighted items. Is there a attribute to fix in the list View Layout or something else?
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May 11, 2010
made a custom list adapter extending the Base adapter. Each item in the list has an imagebutton, 2 textviews and a button. I tried to add the context menu to the list so as to display some options for an item in the list. registerForContextMenu(getListView()); I used a MenuInflater object to inflate the context menu xml file. But on clicking the items in the list nothing shows up or the usual highlighting of the item of list on click isn't shown. Is it that the context menu doesn't work for custom list views? Any help would be much appreciated.
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Oct 13, 2010
I've got a schedule Class, which is simply a custom ViewGroup (with custom onMeasure() and onLayout()), which enables me to place childs(=events) with LayoutParams for column/row start and column/row end. The number of childs and their LayoutParams depend on database entries.
Now I'm trying to add childs (events) from my database. I'd have to use a Cursor Adapter, so my schedule Class has to extend ListView, right? I tried that but the newView() method of the adapter is never called. Why not? My custom ListView doesn't ask the adapter for childs, no childs are added. I also can't add the childs by hand calling schedule.addView() if I extend from AdapterView.
How can I add events to the schedule with the data from the cursor?
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Jul 3, 2010
I'd like to make a list adapter that formats views like this:
I want to be able to fire a different onClick when the user clicks the image. I have defined the onClick on the image itself in the getView() override, but how do I then get the position of the line that was clicked so I can update the record in the database to record the action?
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Sep 13, 2010
When creating a custom account and/or sync adapter, raw_contacts that belong to your custom account can be created. But it looks like that they then cannot be edited with the Contact app! Is this a known limitation, or a problem in my code?
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Nov 14, 2010
I have made customAdapter (which extends BaseAdapter). I want to reuse the old views..
So I am checking:
CODE:........................
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Oct 28, 2010
I'm have a custom GridView Array Adapter. The problem for me is that when the grid list gets large enough to scroll off the screen the gridview and arraylist get out of sync. For instance in my case I have code that checks if an actor is of type director the text color should be red. if you scroll up and down my list enough times all the actors text in my gridview will become red. The thing is that the Gridview appearance actually looks fine its the backing data. Here is the complete class. In the code you can see where I tried to override getItem and getItemId but that didn't fix anything. Code...
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Oct 26, 2009
I've seen posts on how, but don't understand what rooting is. Been anxiously awaiting the first VZW android phones, so am now trying to quickly immerse myself.
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Aug 17, 2009
I have an application that uses an extended Broadcast Receiver class inside the Activity. I have the extended Broadcast Receiver class as a member variable of the Activity class. But it looks like the receiver references keep changing between its construction and 'on Receive' method call. I would like to understand this better. Here are some details. public class MyEventReceiver extends Broadcast Receiver
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Aug 24, 2010
We have written an Android application which sends stack traces to our server, if any occur. Sometimes we get weird stack traces that seem not to be an exception from our application.
For example:
CODE:........
There is no mention of our own classes, only Android's standard classes. It's obvious that this exception takes place when scrolling of item list (ListView) occurs, but I can't even uderstand how I can fix this bug. I can't reproduce this bug.
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Nov 18, 2010
I am using a system() call in a program , that is in c library. For 1st 9 calls it returns '0'(zero) after 10th call it returns 256. I do not know what does it mean. Please anybody help me. Following is the line of code int returnValue= system("/system/bin/cat /dev/graphics/fb0 > /tmpdata/Screenshot/screenshot.bin");
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Nov 3, 2010
I did not understand the notepad sample in android.when i import this to my workspace it shows there are no projects.Its having sqlite code i want to see how this application running,Please explain it once.
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Jun 6, 2010
In order to use hotspot a rep tells me I have to sign up for $29/month fee.. it will connect up to 8 devices or so.I also see peeps tethering their ipad etc. I doubt they are paying the fee.i also hear it will soon be free with an upcoming update?
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Apr 6, 2010
Below are the only instructions i managed to find from google on how to install the android NDK, it is written as if we all run Linux and presumes we all understand what these obscure tools are. My comments and questions appear in Italics if somone who knows unix and windows would translate for google that would be great!
Android NDK Installation
Introduction:
Please read docs/OVERVIEW.TXT to understand what the Android NDK is and is not. This file gives instructions on how to properly setup your NDK.
I. Requirements:
The Android NDK currently requires a Linux, OS X or Windows host operating system. Windows users will need to install Cygwin (http://www.cygwin.com) to use it. Note that running the NDK under MSys is not supported.
You will need to have the Android SDK and its dependencies installed. The NDK cannot generate final application packages (.apk files), only the shared library files that can go into them.
IMPORTANT:
The Android NDK can only be used to target system images using the Cupcake (1.5) or later releases of the platform. This is due to subtle toolchain and ABI related changed that make it incompatible with 1.0 and 1.1 system images.
The NDK requires GNU Make 3.81 or later being available on your development system. Earlier versions of GNU Make might work but have not been tested.
You can check this by running 'make -v' from the command-line. The output should look like:
GNU Make 3.81 Copyright (C) 2006 Free Software Foundation, Inc.
...
On certain systems, GNU Make might be available through a different command like 'gmake' or 'gnumake'. For these systems, replace 'make' by the appropriate command when invoking the NDK build system as described in the documentation.
Great some strange thing called gnu make.. if your not going to tell me what it does maybe you then at least you could give me a URL to it?
The NDK also requires a Nawk or GNU Awk executable being available on your development system. Note that the original 'awk' program doesn't implement the 'match' and 'substr' functions used by the NDK build system.
Ok another tool, with 1 of 2 possible names, but not the third... and again where should i download this?
On Windows, you will need to install a recent release of Cygwin to use the NDK.
See http://www.cygwin.com for instructions.
Woohoo a URL! download took about a day because these install instructions do not specify what parts to download.
II. Preparing your installation prebuilt cross-toolchain binaries:
After installing and unarchiving the NDK, you will need to run the following
command from the root folder:
build/host-setup.sh
hello? windows dont run nothing but .exe .com or .dll, just tell me how you want me to run it..
This will test your setup and make sure the NDK can work properly.
Nothing is said about where any of these things need to be installed to (what directory)
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