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ViewPager for images on SD card not working

I am a newbie in android app development and I am following this tutorial to create an image gallery.
https://deepshikhapuri.wordpress.com/2017/03/20/get-all-images-from-gallery-in-android-programmatically/.
It's working perfectly but now I want to display images in ViewPager for being able to display images by swiping left/right.I am using an adapter for doing it.
I have tried doing it but its not working I dont know why.I am not able to swipe images. Can anyone help me with it ? Am i using correct path for the images?
This project is available on github here :
https://github.com/avi003/MyApp0-master-master
ImageGallery.java:
public class ImageGallery extends AppCompatActivity {
public static ArrayList<Model_images> al_images = new ArrayList<>();
boolean boolean_folder;
Adapter_PhotosFolder obj_adapter;
GridView gv_folder;
private static final int REQUEST_PERMISSIONS = 100;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_gallery);
gv_folder = (GridView)findViewById(R.id.gv_folder);
gv_folder.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(getApplicationContext(), PhotosActivity.class);
intent.putExtra("value",i);
startActivity(intent);
}
});
if ((ContextCompat.checkSelfPermission(getApplicationContext(),
Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) && (ContextCompat.checkSelfPermission(getApplicationContext(),
Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)) {
if ((ActivityCompat.shouldShowRequestPermissionRationale(ImageGallery.this,
Manifest.permission.WRITE_EXTERNAL_STORAGE)) && (ActivityCompat.shouldShowRequestPermissionRationale( ImageGallery.this,
Manifest.permission.READ_EXTERNAL_STORAGE))) {
} else {
ActivityCompat.requestPermissions( ImageGallery.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE},
REQUEST_PERMISSIONS);
}
}else {
Log.e("Else","Else");
fn_imagespath();
}
}
public ArrayList<Model_images> fn_imagespath() {
al_images.clear();
int int_position = 0;
Uri uri;
Cursor cursor;
int column_index_data, column_index_folder_name;
String absolutePathOfImage;
uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
String[] projection = {MediaStore.MediaColumns.DATA, MediaStore.Images.Media.BUCKET_DISPLAY_NAME};
final String orderBy = MediaStore.Images.Media.DATE_TAKEN;
cursor = getApplicationContext().getContentResolver().query(uri, projection, null, null, orderBy + " DESC");
column_index_data = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
column_index_folder_name = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
while (cursor.moveToNext()) {
absolutePathOfImage = cursor.getString(column_index_data);
Log.e("Column", absolutePathOfImage);
Log.e("Folder", cursor.getString(column_index_folder_name));
for (int i = 0; i < al_images.size(); i++) {
if (al_images.get(i).getStr_folder().equals(cursor.getString(column_index_folder_name))) {
boolean_folder = true;
int_position = i;
break;
} else {
boolean_folder = false;
}
}
if (boolean_folder) {
ArrayList<String> al_path = new ArrayList<>();
al_path.addAll(al_images.get(int_position).getAl_imagepath());
al_path.add(absolutePathOfImage);
al_images.get(int_position).setAl_imagepath(al_path);
} else {
ArrayList<String> al_path = new ArrayList<>();
al_path.add(absolutePathOfImage);
Model_images obj_model = new Model_images();
obj_model.setStr_folder(cursor.getString(column_index_folder_name));
obj_model.setAl_imagepath(al_path);
al_images.add(obj_model);
}
}
for (int i = 0; i < al_images.size(); i++) {
Log.e("FOLDER", al_images.get(i).getStr_folder());
for (int j = 0; j < al_images.get(i).getAl_imagepath().size(); j++) {
Log.e("FILE", al_images.get(i).getAl_imagepath().get(j));
}
}
obj_adapter = new Adapter_PhotosFolder(getApplicationContext(),al_images);
gv_folder.setAdapter(obj_adapter);
return al_images;
}
#Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST_PERMISSIONS: {
for (int i = 0; i < grantResults.length; i++) {
if (grantResults.length > 0 && grantResults[i] == PackageManager.PERMISSION_GRANTED) {
fn_imagespath();
} else {
Toast.makeText(ImageGallery.this, "The app was not allowed to read or write to your storage. Hence, it cannot function properly. Please consider granting it this permission", Toast.LENGTH_LONG).show();
}
}
}
}
}
}
PhotosActivity.java:
public class PhotosActivity extends AppCompatActivity {
int int_position;
private GridView gridView;
GridViewAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_gallery);
gridView = (GridView)findViewById(R.id.gv_folder);
int_position = getIntent().getIntExtra("value", 0);
adapter = new GridViewAdapter(this, al_images,int_position);
gridView.setAdapter(adapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String abc = "file://" + al_images.get(int_position).getAl_imagepath().get(position);
Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
i.putExtra("id", position);
i.putExtra("abc",abc);
startActivity(i);
}
});
}
}
GridViewAdapter.java:
public class GridViewAdapter extends ArrayAdapter<Model_images> {
Context context;
ViewHolder viewHolder;
ArrayList<Model_images> al_menu = new ArrayList<>();
int int_position;
public GridViewAdapter(Context context, ArrayList<Model_images> al_menu,int int_position) {
super(context, R.layout.activity_adapter__photos_folder, al_menu);
this.al_menu = al_menu;
this.context = context;
this.int_position = int_position;
}
#Override
public int getCount() {
Log.e("ADAPTER LIST SIZE", al_menu.get(int_position).getAl_imagepath().size() + "");
return al_menu.get(int_position).getAl_imagepath().size();
}
#Override
public int getItemViewType(int position) {
return position;
}
#Override
public int getViewTypeCount() {
if (al_menu.get(int_position).getAl_imagepath().size() > 0) {
return al_menu.get(int_position).getAl_imagepath().size();
} else {
return 1;
}
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = LayoutInflater.from(getContext()).inflate(R.layout.activity_adapter__photos_folder, parent, false);
viewHolder.tv_foldern = (TextView) convertView.findViewById(R.id.tv_folder);
viewHolder.tv_foldersize = (TextView) convertView.findViewById(R.id.tv_folder2);
viewHolder.iv_image = (ImageView) convertView.findViewById(R.id.iv_image);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.tv_foldern.setVisibility(View.GONE);
viewHolder.tv_foldersize.setVisibility(View.GONE);
Glide.with(context).load("file://" + al_menu.get(int_position).getAl_imagepath().get(position))
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
.into(viewHolder.iv_image);
return convertView;
}
private static class ViewHolder {
TextView tv_foldern, tv_foldersize;
ImageView iv_image;
}
}
Adapter_PhotosFolder.java:
public class Adapter_PhotosFolder extends ArrayAdapter<Model_images> {
Context context;
ViewHolder viewHolder;
ArrayList<Model_images> al_menu = new ArrayList<>();
public Adapter_PhotosFolder(Context context, ArrayList<Model_images> al_menu) {
super(context, R.layout.activity_adapter__photos_folder, al_menu);
this.al_menu = al_menu;
this.context = context;
}
#Override
public int getCount() {
Log.e("ADAPTER LIST SIZE", al_menu.size() + "");
return al_menu.size();
}
#Override
public int getItemViewType(int position) {
return position;
}
#Override
public int getViewTypeCount() {
if (al_menu.size() > 0) {
return al_menu.size();
} else {
return 1;
}
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = LayoutInflater.from(getContext()).inflate(R.layout.activity_adapter__photos_folder, parent, false);
viewHolder.tv_foldern = (TextView) convertView.findViewById(R.id.tv_folder);
viewHolder.tv_foldersize = (TextView) convertView.findViewById(R.id.tv_folder2);
viewHolder.iv_image = (ImageView) convertView.findViewById(R.id.iv_image);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.tv_foldern.setText(al_menu.get(position).getStr_folder());
viewHolder.tv_foldersize.setText(al_menu.get(position).getAl_imagepath().size()+"");
Glide.with(context).load("file://" + al_menu.get(position).getAl_imagepath().get(0))
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
.into(viewHolder.iv_image);
return convertView;
}
private static class ViewHolder {
TextView tv_foldern, tv_foldersize;
ImageView iv_image;
}
}
Model_images.java:
public class Model_images {
String str_folder;
ArrayList<String> al_imagepath;
public String getStr_folder() {
return str_folder;
}
public void setStr_folder(String str_folder) {
this.str_folder = str_folder;
}
public ArrayList<String> getAl_imagepath() {
return al_imagepath;
}
public void setAl_imagepath(ArrayList<String> al_imagepath) {
this.al_imagepath = al_imagepath;
}
}
FullImageActivity.java:
public class FullImageActivity extends AppCompatActivity {
ImageView images;
int position;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_full_image);
Intent i = getIntent();
images = (ImageView) findViewById(R.id.fullImage);
// Selected image id
position = i.getExtras().getInt("id");
Bundle extras = getIntent().getExtras();
String value = extras.getString("abc");
Glide.with(FullImageActivity.this)
.load(value)
.skipMemoryCache(false)
.into(images);
ViewPager mViewPager = (ViewPager) findViewById(R.id.viewpager);
mViewPager.setAdapter(new TouchImageAdapter(this,al_images));
}
}
activity_full_image.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/jazzy_pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/fullImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:scaleType="centerCrop"
/>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
TouchImageAdapter.java:
class TouchImageAdapter extends PagerAdapter {
Context context;
String filename;
ArrayList<Model_images> al_menu = new ArrayList<>();
int position,int_position;
public TouchImageAdapter(Context context,ArrayList<Model_images> al_menu){
this.al_menu = al_menu;
this.context = context;
}
#Override
public int getCount() {
return al_menu.size();
}
#Override
public View instantiateItem(ViewGroup container, int position) {
ImageView img = new ImageView(container.getContext());
img.setImageDrawable(getImageFromSdCard(filename,position));
container.addView(img, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
return img;
}
public int getItemPosition(Object object) {
return POSITION_NONE;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
public Drawable getImageFromSdCard(String imageName,int position) {
Drawable d = null;
try {
String path = al_menu.get(int_position).getAl_imagepath().get(position)
+ "/";
Bitmap bitmap = BitmapFactory.decodeFile(path + "/" + imageName
+ ".jpeg");
d = new BitmapDrawable(context.getResources(),bitmap);
} catch (IllegalArgumentException e) {
// TODO: handle exception
}
return d;
}
}

Here you are not passing count of images inside that folder, So in TouchImageAdapter you have passing the count of folder like :
al_menu.size() // it always give you size of folder,
al_menu.get(int_position).getAl_imagepath().size();
// passing the folder position so that correct folder images are to be shown.
public TouchImageAdapter(Context context,ArrayList<Model_images> al_menu, int position){
this.al_menu = al_menu;
this.context = context;
this.int_position = position;
}
#Override
public int getCount() {
return al_menu.get(int_position).getAl_imagepath().size();
}
Here is the updated code I pushed on
https://github.com/redviper00/game

try this
String[] filenames = new String[0];
File path = new File(Environment.getExternalStorageDirectory() + "/your folder");
if (path.exists()) {
filenames = path.list();
}
for (int i = 0; i < filenames.length; i++) {
imagesPathArrayList.add(path.getPath() + "/" + filenames[i]);
Log.e("FAV_Images", imagesPathArrayList.get(i));
adapter = new ImageAdapter(FavActivity.this, imagesPathArrayList);
myviewpager.setAdapter(adapter);
}
create adapter class like this
public class ImageAdapter extends PagerAdapter {
Context context;
ArrayList<String> arrayList;
ImageAdapter(Context context, ArrayList<String> arrayList) {
this.context = context;
this.arrayList = arrayList;
}
#Override
public int getCount() {
return arrayList.size();
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == ((ImageView) object);
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
viewPagerImageView = new ImageView(context);
viewPagerImageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
Bitmap bitmap = BitmapFactory.decodeFile(arrayList.get(position));
viewPagerImageView.setImageBitmap(bitmap);
((ViewPager) container).addView(viewPagerImageView, 0);
return viewPagerImageView;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView((ImageView) object);
}
}

It seems like you are showing Imageview above view pager
images = (ImageView) findViewById(R.id.fullImage);
that is why when you are trying to swipe imageview handle your tocuh action instead of view pager. Remove it.

detecting ParseObject in Custom List View

In each row, I have a button and a textView. When the Button is clicked, It successfully sets the textView to a new value in that row. However, When I call ParseQuery() in GetView(); and try to do object.put("objectName", num) The only value that is populated to my Parse-Server is the last row. My SetTag(); and GetTag(); and ViewHolder class is correct When I click the button, I believe android studio is unsure of which row's TextView to populate so it just automatically populates the last row's TextView.
Custom ListView Adapter Class
public class CustomFeedListViewAdapter extends BaseAdapter {
String likesString;
int position;
private Context mContext;
private ArrayList<HashMap<String, String>> feed;
private static LayoutInflater inflater = null;
ParseObject parseObFeed;
public CustomFeedListViewAdapter(Context context, ArrayList<HashMap<String, String>> data) {
super();
this.mContext = context;
this.feed = data;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return feed.size();
}
#Override
public Object getItem(int i) {
return feed.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(final int i, View view, ViewGroup viewGroup) {
position = i;
final ViewHolder holder;
if (view == null) {
view = inflater.inflate(R.layout.feed_list_row, viewGroup, false);
holder = new ViewHolder();
holder.feedProfilePic = (ImageView) view.findViewById(R.id.feedProfilePic);
holder.feedUsername = (TextView) view.findViewById(R.id.feedUsernameId);
holder.feedNumOfLikes = (TextView) view.findViewById(R.id.feedNumofLikes);
holder.feedUpVoteButton = (Button) view.findViewById(R.id.feedUpVoteButton);
view.setTag(holder);
HashMap<String, String> mFeed = new HashMap<>();
mFeed = feed.get(i);
holder.feedNumOfLikes.setText(mFeed.get("likes"));
likesString = mFeed.get("likes");
holder.mLikes = Integer.valueOf(likesString);
position = i;
}
else{
position = i;
holder = (ViewHolder) view.getTag();
}
holder.feedUpVoteButton.setTag(position);
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("FeedItem");
query.addDescendingOrder("createdAt");
query.findInBackground(new FindCallback<ParseObject>() {
#Override
public void done(List<ParseObject> objects, ParseException e) {
if(e == null){
for (final ParseObject object : objects) {
holder.feedUpVoteButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ParseObject[] mParseObject = new ParseObject[feed.size()];
int pos = (Integer) v.getTag();
mParseObject[pos] = object;
holder.likes[pos] = holder.mLikes;
mParseObject[pos].put("likes", holder.likes[pos]);
mParseObject[pos].saveInBackground();
holder.feedNumOfLikes.setText(String.valueOf(holder.likes[pos]
));
}
});
}
}
}
});
return view;
}
class ViewHolder {
ImageView feedProfilePic;
TextView feedUsername;
TextView feedNumOfLikes;
TextView feedFeedItem;
TextView feedDate;
TextView feedNumofReplies;
Button feedUpVoteButton;
Button feedDownVoteButton;
Button feedCommentButton;
ListView feedListView;
int likes[] = new int[feed.size()];
int mLikes;
}
}

Selected item not changed in the custom ListPreference

It seems setChecked is invoked every time I click the preference and the selected item changes but in the dialog the selected item remains unchanged for some reason. I have no idea what's going on. Relaunching the application can make the selected item change but that's not the expected behavior. :~
Here's the class:
public class IconListPreference extends ListPreference {
private Context mContext;
private LayoutInflater mInflater;
private Drawable[] mEntryIcons = null;
private String mKey;
private int selectedEntry = -1;
public IconListPreference(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public IconListPreference(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs);
mContext = context;
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.IconPreference, defStyle, 0);
int entryIconsResId = a.getResourceId(R.styleable.IconPreference_entryIcons, -1);
if (entryIconsResId != -1) setEntryIcons(entryIconsResId);
mInflater = LayoutInflater.from(context);
mKey = getKey();
a.recycle();
}
public void setEntryIcons(Drawable[] entryIcons) {
mEntryIcons = entryIcons;
}
public void setEntryIcons(int entryIconsResId) {
TypedArray icons_array = mContext.getResources().obtainTypedArray(entryIconsResId);
Drawable[] icon_ids_array = new Drawable[icons_array.length()];
for (int i = 0; i < icons_array.length(); i++) icon_ids_array[i] = icons_array.getDrawable(i);
setEntryIcons(icon_ids_array);
icons_array.recycle();
}
#Override
protected void onPrepareDialogBuilder(Builder builder) {
CharSequence[] entries = getEntries(), entryValues = getEntryValues();
if (entries.length != entryValues.length) throw new IllegalStateException
("ListPreference requires an entries array and an entryValues array which are both the same length");
if (mEntryIcons != null && entries.length != mEntryIcons.length) throw new IllegalStateException
("IconListPreference requires the icons entries array be the same length than entries or null");
IconListPreferenceScreenAdapter iconListPreferenceAdapter = new IconListPreferenceScreenAdapter();
if (mEntryIcons != null) {
String selectedValue = getPreferenceManager().getSharedPreferences().getString(mKey, "");
for (int i = 0; i < entryValues.length; i++) {
if (selectedValue.compareTo((String) entryValues[i]) == 0) {
selectedEntry = i;
break;
}
}
builder.setAdapter(iconListPreferenceAdapter, null);
}
super.onPrepareDialogBuilder(builder);
}
private class IconListPreferenceScreenAdapter extends BaseAdapter {
public int getCount() {
return mEntryIcons.length;
}
class CustomHolder {
private CheckedTextView text = null;
CustomHolder(View row, int position) {
text = (CheckedTextView) row.findViewById(android.R.id.text1);
text.setText(getEntries()[position]);
text.setChecked(selectedEntry == position);
if (mEntryIcons != null)
text.setCompoundDrawablesWithIntrinsicBounds(mEntryIcons[position], null, null, null);
}
}
public Object getItem(int position) {
return getEntries()[position];
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) convertView = mInflater.inflate(Resources.getSystem()
.getIdentifier("select_dialog_singlechoice_holo", "layout", "android"), parent, false);
CustomHolder holder;
final int p = position;
holder = new CustomHolder(convertView, position);
convertView.setTag(holder);
convertView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
v.requestFocus();
getDialog().dismiss();
IconListPreference.this.callChangeListener(getEntryValues()[p]);
SharedPreferences.Editor editor = getPreferenceManager().getSharedPreferences().edit();
editor.putString(mKey, getEntryValues()[p].toString());
selectedEntry = p;
editor.apply();
}
});
return convertView;
}
}
}
And res/values/attrs.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="IconPreference">
<attr name="entryIcons" format="reference" />
</declare-styleable>
</resources>
EDIT: Updated my code with a bugfix, but still don't work sthough. A temporary solution found: invoke setValue((String) newValue) in OnPreferenceChangeListener.onPreferenceChange.

OK I finally get it. You need to do the following to make your customized preference work:
callChangeListener before setting user-supplied values;
notifyChanged if you need to update user interface, i.e. whenever value changes.

value not updating from field but identical one does

I have this weird bug that I cannot seem to diagnose, I have 2 fields one is getting the value from the DB and the other one is not.
My problem is that "friends[position].userPresence" isn't returning any values from DB, but an Identical one called "friends[position].userStatus" is returning values, but when I assign userPresence's column name to userStatus, then userStatus is returning the correct info for the column.
Any help would be highly appreciated!
public class FriendList extends ListActivity {
private static final int ADD_NEW_FRIEND_ID = Menu.FIRST;
private static final int EXIT_APP_ID = Menu.FIRST + 1;
private IAppManager imService = null;
private FriendListAdapter friendAdapter;
public String ownusername = new String();
private class FriendListAdapter extends BaseAdapter {
class ViewHolder {
TextView text;
TextView status;
ImageView avatar;
ImageView onlstatus;
}
private LayoutInflater mInflater;
private Bitmap mOnlineIcon;
private Bitmap mOfflineIcon;
private Bitmap mAwayIcon;
private Bitmap mPersonPic;
private FriendInfo[] friends = null;
public FriendListAdapter(Context context) {
super();
mInflater = LayoutInflater.from(context);
mOnlineIcon = BitmapFactory.decodeResource(context.getResources(),
R.drawable.online);
mOfflineIcon = BitmapFactory.decodeResource(context.getResources(),
R.drawable.offline);
mAwayIcon = BitmapFactory.decodeResource(context.getResources(),
R.drawable.away);
mPersonPic = BitmapFactory.decodeResource(context.getResources(),
R.drawable.no_photo_icon_big);
}
public void setFriendList(FriendInfo[] friends) {
this.friends = friends;
}
#Override
public int getCount() {
return friends.length;
}
#Override
public FriendInfo getItem(int position) {
return friends[position];
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// A ViewHolder keeps references to children views to avoid
// unneccessary calls
// to findViewById() on each row.
ViewHolder holder;
// When convertView is not null, we can reuse it directly, there is
// no need
// to reinflate it. We only inflate a new View when the convertView
// supplied
// by ListView is null.
if (convertView == null) {
convertView = mInflater.inflate(R.layout.friend_list_screen,
null);
// Creates a ViewHolder and store references to the two children
// views
// we want to bind data to.
holder = new ViewHolder();
holder.text = (TextView) convertView
.findViewById(R.id.userName);
holder.status = (TextView) convertView
.findViewById(R.id.userStatusMsg);
holder.onlstatus = (ImageView) convertView
.findViewById(R.id.icon_status);
holder.avatar = (ImageView) convertView.findViewById(R.id.icon);
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Bind the data efficiently with the holder.
holder.text.setText(friends[position].userName);
holder.onlstatus
.setImageBitmap(friends[position].userStatus == "Available" ? mOnlineIcon :
friends[position].userStatus == "Busy" ? mOfflineIcon : mAwayIcon);
holder.avatar.setImageBitmap(mPersonPic);
holder.status.setText(friends[position].userPresence);
/*
* holder.icon .setImageBitmap(friends[position].status ==
* STATUS.ONLINE ? mOnlineIcon : mOfflineIcon);
*/
return convertView;
}
}
FriendInfo
public class FriendList extends ListActivity {
private static final int ADD_NEW_FRIEND_ID = Menu.FIRST;
private static final int EXIT_APP_ID = Menu.FIRST + 1;
private IAppManager imService = null;
private FriendListAdapter friendAdapter;
public String ownusername = new String();
private class FriendListAdapter extends BaseAdapter {
class ViewHolder {
TextView text;
TextView status;
ImageView avatar;
ImageView onlstatus;
}
private LayoutInflater mInflater;
private Bitmap mOnlineIcon;
private Bitmap mOfflineIcon;
private Bitmap mAwayIcon;
private Bitmap mPersonPic;
private FriendInfo[] friends = null;
public FriendListAdapter(Context context) {
super();
mInflater = LayoutInflater.from(context);
mOnlineIcon = BitmapFactory.decodeResource(context.getResources(),
R.drawable.online);
mOfflineIcon = BitmapFactory.decodeResource(context.getResources(),
R.drawable.offline);
mAwayIcon = BitmapFactory.decodeResource(context.getResources(),
R.drawable.away);
mPersonPic = BitmapFactory.decodeResource(context.getResources(),
R.drawable.no_photo_icon_big);
}
public void setFriendList(FriendInfo[] friends) {
this.friends = friends;
}
#Override
public int getCount() {
return friends.length;
}
#Override
public FriendInfo getItem(int position) {
return friends[position];
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// A ViewHolder keeps references to children views to avoid
// unneccessary calls
// to findViewById() on each row.
ViewHolder holder;
// When convertView is not null, we can reuse it directly, there is
// no need
// to reinflate it. We only inflate a new View when the convertView
// supplied
// by ListView is null.
if (convertView == null) {
convertView = mInflater.inflate(R.layout.friend_list_screen,
null);
// Creates a ViewHolder and store references to the two children
// views
// we want to bind data to.
holder = new ViewHolder();
holder.text = (TextView) convertView
.findViewById(R.id.userName);
holder.status = (TextView) convertView
.findViewById(R.id.userStatusMsg);
holder.onlstatus = (ImageView) convertView
.findViewById(R.id.icon_status);
holder.avatar = (ImageView) convertView.findViewById(R.id.icon);
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Bind the data efficiently with the holder.
holder.text.setText(friends[position].userName);
holder.onlstatus
.setImageBitmap(friends[position].userStatus == "Available" ? mOnlineIcon :
friends[position].userStatus == "Busy" ? mOfflineIcon : mAwayIcon);
holder.avatar.setImageBitmap(mPersonPic);
holder.status.setText(friends[position].userPresence);
/*
* holder.icon .setImageBitmap(friends[position].status ==
* STATUS.ONLINE ? mOnlineIcon : mOfflineIcon);
*/
return convertView;
}
}
public class MessageReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Log.i("Broadcast receiver ", "received a message");
Bundle extra = intent.getExtras();
if (extra != null) {
String action = intent.getAction();
if (action.equals(IMService.FRIEND_LIST_UPDATED)) {
// taking friend List from broadcast
// String rawFriendList =
// extra.getString(FriendInfo.FRIEND_LIST);
// FriendList.this.parseFriendInfo(rawFriendList);
FriendList.this.updateData(
FriendController.getFriendsInfo(),
FriendController.getUnapprovedFriendsInfo());
}
}
}
};
public MessageReceiver messageReceiver = new MessageReceiver();
private ServiceConnection mConnection = new ServiceConnection() {
#Override
public void onServiceConnected(ComponentName className, IBinder service) {
imService = ((IMService.IMBinder) service).getService();
FriendInfo[] friends = FriendController.getFriendsInfo(); // imService.getLastRawFriendList();
if (friends != null) {
FriendList.this.updateData(friends, null); // parseFriendInfo(friendList);
}
// setTitle(imService.getUsername() + "'s friend list");
CommonUtility.setCustomTitlebar(FriendList.this, imService);
ownusername = imService.getUsername();
((LinearLayout)findViewById(R.id.actionbar_layout)).setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(FriendList.this,UserProfile.class));
}
});
}
#Override
public void onServiceDisconnected(ComponentName className) {
imService = null;
Toast.makeText(FriendList.this, R.string.local_service_stopped,
Toast.LENGTH_SHORT).show();
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.list_screen);
friendAdapter = new FriendListAdapter(this);
}
public void updateData(FriendInfo[] friends, FriendInfo[] unApprovedFriends) {
if (friends != null) {
friendAdapter.setFriendList(friends);
setListAdapter(friendAdapter);
}
if (unApprovedFriends != null) {
NotificationManager NM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
if (unApprovedFriends.length > 0) {
String tmp = new String();
for (int j = 0; j < unApprovedFriends.length; j++) {
tmp = tmp.concat(unApprovedFriends[j].userName).concat(",");
}
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
this).setSmallIcon(R.drawable.ic_launcher) // TODO Redo
// friend
// notification
.setContentTitle(
getText(R.string.new_friend_request_exist));
/*
* Notification notification = new
* Notification(R.drawable.stat_sample,
* getText(R.string.new_friend_request_exist),
* System.currentTimeMillis());
*/
Intent i = new Intent(this, UnApprovedFriendList.class);
i.putExtra(FriendInfo.FRIEND_LIST, tmp);
PendingIntent contentIntent = PendingIntent.getActivity(this,
0, i, 0);
mBuilder.setContentText("You have new friend request(s)");
/*
* notification.setLatestEventInfo(this,
* getText(R.string.new_friend_request_exist),
* "You have new friend request(s)", contentIntent);
*/
mBuilder.setContentIntent(contentIntent);
NM.notify(R.string.new_friend_request_exist, mBuilder.build());
} else {
// if any request exists, then cancel it
NM.cancel(R.string.new_friend_request_exist);
}
}
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent i = new Intent(this, Messaging.class);
FriendInfo friend = friendAdapter.getItem(position);
i.putExtra(FriendInfo.USERNAME, friend.userName);
i.putExtra(FriendInfo.PORT, friend.port);
i.putExtra(FriendInfo.IP, friend.ip);
startActivity(i);
}
#Override
protected void onPause() {
unregisterReceiver(messageReceiver);
unbindService(mConnection);
super.onPause();
}
#Override
protected void onResume() {
super.onResume();
bindService(new Intent(FriendList.this, IMService.class), mConnection,
Context.BIND_AUTO_CREATE);
IntentFilter i = new IntentFilter();
// i.addAction(IMService.TAKE_MESSAGE);
i.addAction(IMService.FRIEND_LIST_UPDATED);
registerReceiver(messageReceiver, i);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
boolean result = super.onCreateOptionsMenu(menu);
menu.add(0, ADD_NEW_FRIEND_ID, 0, R.string.add_new_friend);
menu.add(0, EXIT_APP_ID, 0, R.string.exit_application);
return result;
}
#Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch (item.getItemId()) {
case ADD_NEW_FRIEND_ID: {
Intent i = new Intent(FriendList.this, AddFriend.class);
startActivity(i);
return true;
}
case EXIT_APP_ID: {
imService.exit();
finish();
return true;
}
}
return super.onMenuItemSelected(featureId, item);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
}
The XML Handler
public void startElement(String uri, String localName, String name,
Attributes attributes) throws SAXException {
if (localName == "friend") {
FriendInfo friend = new FriendInfo();
friend.userName = attributes.getValue(FriendInfo.USERNAME);
String status = attributes.getValue(FriendInfo.STATUS);
friend.ip = attributes.getValue(FriendInfo.IP);
friend.port = attributes.getValue(FriendInfo.PORT);
friend.userPresence = attributes.getValue(FriendInfo.USER_PRESENCE);
friend.userStatus = attributes.getValue(FriendInfo.USER_STATUS);
friend.userDisplayName = attributes.getValue(FriendInfo.USER_DISPNAME);
friend.userKey = attributes.getValue(FriendInfo.USER_KEY);
friend.expire = attributes.getValue("expire");
if (status != null && status.equals("online")) {
friend.status = STATUS.ONLINE;
mOnlineFriends.add(friend);
} else if (status.equals("unApproved")) {
friend.status = STATUS.UNAPPROVED;
mUnapprovedFriends.add(friend);
} else {
friend.status = STATUS.OFFLINE;
mFriends.add(friend);
}
} else if (localName == "user") {
this.userKey = attributes.getValue(FriendInfo.USER_KEY);
} else if (localName == "message") {
MessageInfo message = new MessageInfo();
message.userid = attributes.getValue(MessageInfo.USERID);
message.sendt = attributes.getValue(MessageInfo.SENDT);
message.messagetext = attributes.getValue(MessageInfo.MESSAGETEXT);
Log.i("MessageLOG", message.userid + message.sendt
+ message.messagetext);
mUnreadMessages.add(message);
}
super.startElement(uri, localName, name, attributes);
}
FriendInfo Class
public class FriendInfo {
public static final String FRIEND_LIST = "friendList";
public static final String USERNAME = "username";
public static final String IP = "IP";
public static final String PORT = "port";
public static final String USER_KEY = "userKey";
public static final String USER_DISPNAME = "displayname";
public static final String MESSAGE = "message"; // this should not be in
// here
public static final String STATUS = "status";
public static final String USER_STATUS = "status_msg";
public static final String USER_PRESENCE = "status_msg2";
public STATUS status;
public String userStatus;
public String userPresence;
public String userDisplayName;
public String userName;
public String ip;
public String port;
public String userKey;
public String expire;
};

I don't see what the solution is. However, I would suggest you flood your program with System.out.println() statements to see what values are throughout your program. Alternately (and better) is to use your IDE's debugger and set breakpoints to examine values.

Saving text and checkbox state in custom list

I am making a custom list and I want to save the text of some TextFile which is in R.id.quantity.
I also want to save the state of a checkbox. I tried to manage checked state of a checkbox in a list.
The List contains other view controls. I have put them in a Viewholder class. I am initializing qtyTxtV with some initial array value, once an event occurs in this code the value of the array changes but the list contents gets erased. Please help out.
Now this code is giving me a null pointer exception:
class MyAdapter1 extends BaseAdapter {
Context context;
ArrayList<Integer> price = new ArrayList<Integer>();
ArrayList<String> names = new ArrayList<String>();
public static HashMap<Integer, String> myList = new HashMap<Integer, String>();
static class ViewHolder {
public TextView tvQuantityName, tvPrice, tvDishName;
public ImageView imv1, imv2, imv3, imv4, imv5;
public EditText edtQty;
public CheckBox chkAdd;
}
public MyAdapter1(VegDetail vegDetail, ArrayList<String> names2,
ArrayList<Integer> price2) {
this.context = vegDetail;
this.names = names2;
this.price = price2;
}
#Override
public int getCount() {
return names.size();
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#SuppressWarnings("null")
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
View row = convertView;
ViewHolder holder = null;
// View row = inflater.inflate(R.layout.rowlayout, parent, false);
if (row == null) {
LayoutInflater inflater = LayoutInflater.from(context);
row = inflater.inflate(R.layout.rowlayout, parent, false);
holder.edtQty = (EditText) row.findViewById(R.id.quantity);
holder.imv1 = (ImageView) row.findViewById(R.id.star1);
holder.imv2 = (ImageView) row.findViewById(R.id.star2);
holder.imv3 = (ImageView) row.findViewById(R.id.star3);
holder.imv4 = (ImageView) row.findViewById(R.id.star4);
holder.imv5 = (ImageView) row.findViewById(R.id.star5);
holder.tvDishName = (TextView) row.findViewById(R.id.item_name);
holder.tvPrice = (TextView) row.findViewById(R.id.price1);
holder.tvQuantityName = (TextView) row.findViewById(R.id.qtyTxtV);
holder.chkAdd = (CheckBox) row.findViewById(R.id.chkAdd);
EditText edtQty = (EditText) row.findViewById(R.id.quantity);
edtQty.setText(VegDetail.qtyArray[position].toString());
CheckBox chkAdd = (CheckBox) row.findViewById(R.id.chkAdd);
chkAdd.setSelected(VegDetail.chkArray[position]);
holder.edtQty.addTextChangedListener(new TextWatcher() {
public void onTextChanged(final CharSequence s,
final int start, final int before, final int count) {
}
public void afterTextChanged(final Editable s) {
int newValue;
final String boxContents = s.toString();
if (!boxContents.isEmpty()) {
try {
newValue = Integer.parseInt(boxContents);
VegDetail.qtyArray[position] = newValue;
} catch (final Exception exc) {
VegDetail.qtyArray[position] = 0;
} finally {
}
} else {
VegDetail.qtyArray[position] = 0;
}
}
public void beforeTextChanged(final CharSequence s,
final int start, final int count, final int after) {
}
});
row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
}
CheckBox chkAdd=(CheckBox)row.findViewById(R.id.chkAdd);
chkAdd.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
//VegDetail is another class where I gonna use checked list's states
VegDetail.chkArray[position] = isChecked;
}
});
final TextView tv1 = (TextView) row.findViewById(R.id.item_name);
TextView tv2 = (TextView) row.findViewById(R.id.price1);
final TextView tvQty = (TextView) row.findViewById(R.id.quantity);
tv1.setText(names.get(position));
tv1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context,
"itme name is=>" + tv1.getText().toString(),
Toast.LENGTH_LONG).show();
}
});
tv2.setText("Rs:" + price.get(position));
return row;
}
}

The NPE must be at line :
holder.edtQty = (EditText) row.findViewById(R.id.quantity);
since holder is NULL as you have just defined above...ViewHolder holder = null