This is my BaseAdapater class in which I am using ViewHolder.
public class CategoryAdapter extends BaseAdapter {
private Context mContext;
public int[] mThumbIds = {R.drawable.shoes,R.drawable.dress,R.drawable.purse,
R.drawable.shoes,R.drawable.dress,R.drawable.purse ,
R.drawable.shoes,R.drawable.dress,R.drawable.purse };
public WishbookCategoryAdapter(Context c){
mContext = c;
}
#Override
public int getCount() {
return mThumbIds.length;
}
#Override
public Object getItem(int position) {
return mThumbIds[position];
}
#Override
public long getItemId(int position) {
return (long)position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if(convertView==null){
holder = new ViewHolder();
LayoutInflater li = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = li.inflate(R.layout.wishbook_gridview_items, null);
holder.Category = (TextView)convertView.findViewById(R.id.wishbook_grid_category);
holder.items = (TextView)convertView.findViewById(R.id.wishbook_grid_category_number);
holder.iv = (ImageView)convertView.findViewById(R.id.wishbook_category_image);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder)convertView.getTag();
}
holder.iv.setImageDrawable(mContext.getResources().getDrawable(mThumbIds[position]));
holder.iv.setScaleType(ScaleType.FIT_XY);
holder.Category.setText("Category");
holder.items.setText("items");
return convertView;
}
private static class ViewHolder {
protected ImageView iv;
protected TextView Category;
protected TextView items;
}
}
Related
I would like to display video from database into a grid view i managed to do it with images but have no idea how to do it with a videoview , i would like to do the same but for videos
public class Photoadapter extends BaseAdapter {
private Context context;
private int layout;
private ArrayList<Photo> photoList;
#Override
public int getCount() {
return photoList.size();
}
#Override
public Object getItem(int position) {
return photoList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
private class ViewHolder {
ImageView imageView;
}
#Override
public View getView(int position, View view, ViewGroup viewGroup) {
View row = view;
ViewHolder holder = new ViewHolder();
if (row == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(layout, null);
holder.imageView = (ImageView) row.findViewById(R.id.imageViewList);
row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
}
final Photo photo = photoList.get(position);
final byte[] photoImage = photo.getImage();
final Bitmap bitmap = BitmapFactory.decodeByteArray(photoImage, 0, photoImage.length);
holder.imageView.setImageBitmap(bitmap);
return row;
}
public Photoadapter(Context context, int layout, ArrayList<Photo> photoList) {
this.context = context;
this.layout = layout;
this.photoList = photoList;
}
}
when i was trying tutorial checkbox in listview theres some error on my adapter
public View getView(int position, View convertView, ViewGroup parent) {
ViewTag viewTag;
if (convertView == null) {
//取得listItem容器 view
convertView = myInflater.inflate(R.layout.list_item_pegawai, null);
//建構listItem內容view
viewTag = new ViewTag(
(TextView) convertView.findViewById(R.id.txt_namapegawai),
(CheckBox) convertView.findViewById(R.id.checkBox_pegawai));
//設置容器內容
convertView.setTag(viewTag);
} else {
viewTag = (ViewTag) convertView.getTag();
}
complete code
public class CustomAdapter extends BaseAdapter {
private Context context;
public static ArrayList<Model> modelArrayList;
public CustomAdapter(Context context, ArrayList<Model> modelArrayList) {
this.context = context;
CustomAdapter.modelArrayList = modelArrayList;
}
#Override
public int getViewTypeCount() {
return getCount();
}
#Override
public int getItemViewType(int position) {
return position;
}
#Override
public int getCount() {
return modelArrayList.size();
}
#Override
public Object getItem(int position) {
return modelArrayList.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_item_select, null, true);
holder.checkBox = convertView.findViewById(R.id.checkBox);
holder.tvName = convertView.findViewById(R.id.textView7);
holder.Tvnumber = convertView.findViewById(R.id.textView8);
convertView.setTag(holder);
} else {
// the getTag returns the viewHolder object set as a tag to the view
holder = (ViewHolder) convertView.getTag();
}
holder.tvName.setText(modelArrayList.get(position).getName());
holder.Tvnumber.setText(modelArrayList.get(position).getPhone());
holder.checkBox.setChecked(modelArrayList.get(position).getSelected());
holder.checkBox.setTag(R.integer.btnplusview, convertView);
holder.checkBox.setTag(position);
holder.checkBox.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
View tempview = (View) holder.checkBox.getTag(R.integer.btnplusview);
TextView tv = tempview.findViewById(R.id.textView7);
Integer pos = (Integer) holder.checkBox.getTag();
if (modelArrayList.get(pos).getSelected()) {
modelArrayList.get(pos).setSelected(false);
} else {
modelArrayList.get(pos).setSelected(true);
}
}
});
return convertView;
}
private class ViewHolder {
protected CheckBox checkBox;
private TextView tvName;
private TextView Tvnumber;
}
}
public class ListViewAdapter extends BaseAdapter {
private Context context;
private LocationDetails[] locationDetails;
public ListViewAdapter(Context c, LocationDetails[] locationDetails) {
context = c;
this.locationDetails = locationDetails;
}
#Override
public int getCount() {
return locationDetails.length;
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
View list;
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (view == null) {
list = new View(context);
list = inflater.inflate(R.layout.listview_layout, null);
TextView name = (TextView) list.findViewById(R.id.location_name);
TextView desc = (TextView) list.findViewById(R.id.location_desc);
ImageView img = (ImageView) list.findViewById(R.id.location_image);
name.setText(locationDetails[i].getLocationName());
desc.setText(locationDetails[i].getLocationDesc());
img.setImageResource(locationDetails[i].getLocationIcon());
} else {
list = (View) view;
}
return list;
}
}
This code is the code before I use viewholder, it works fine. Then I tried to modify it with the use of viewholder, and compile it with gradle, all the image and textviews disappeared, I don't know what's wrong with the code below. Why can't I get any thing shown on the screen?
public class LocationAdapter extends BaseAdapter {
private Context context;
private LocationDetails[] locationDetails;
public LocationAdapter(Context c, LocationDetails[] locationDetails) {
context = c;
this.locationDetails = locationDetails;
}
#Override
public int getCount() {
return locationDetails.length;
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
View list = view;
ViewHolder vh;
if (list == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
list = inflater.inflate(R.layout.listview_layout, null);
vh = new ViewHolder();
vh.name = (TextView) list.findViewById(R.id.location_name);
vh.desc = (TextView) list.findViewById(R.id.location_desc);
vh.img = (ImageView) list.findViewById(R.id.location_image);
list.setTag(vh);
} else {
vh = (ViewHolder) list.getTag();
}
return list;
}
static class ViewHolder {
TextView name;
TextView desc;
ImageView img;
}
}
public class LocationAdapter extends BaseAdapter {
private Context context;
private LocationDetails[] locationDetails;
Object model;
public LocationAdapter(Context c, LocationDetails[] locationDetails) {
context = c;
this.locationDetails = locationDetails;
}
#Override
public int getCount() {
return locationDetails.length;
}
#Override
public Object getItem(int i) {
return i;
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
View list = view;
ViewHolder vh;
if (list == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
list = inflater.inflate(R.layout.listview_layout, null);
vh = new ViewHolder();
vh.name = (TextView) list.findViewById(R.id.location_name);
vh.desc = (TextView) list.findViewById(R.id.location_desc);
vh.img = (ImageView) list.findViewById(R.id.location_image);
list.setTag(vh);
} else {
vh = (ViewHolder) list.getTag();
}
model = getItem(i);
vh.name.setText(model.getLocationName());
vh.desc.setText(model.getLocationDesc());
// same as image...
return list;
}
static class ViewHolder {
TextView name;
TextView desc;
ImageView img;
}
}
I am working on an app with multiple TextViews in a ListView, but I seem to have encountered a problem. The list does not appear to get modified.
I'm attachig my code now
public class MainActivity extends ActionBarActivity {
private List<CustomItem> myItem = new ArrayList<>();
ListView listView;
EditText edit;
Button insert;
String getText;
StringTokenizer st;
private String text1,text2;
List<CustomItem> customItem = new ArrayList<CustomItem>();
ArrayAdapter<CustomItem> adapter_List;
CompleteAdapter completeAdapter;
CustomItem obj;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edit = (EditText) findViewById(R.id.editText);
insert = (Button)findViewById(R.id.addBtn);
populate();
listView = (ListView) findViewById(R.id.listView);
completeAdapter = new CompleteAdapter(customItem, this);
listView.setAdapter(completeAdapter);
}
private void populate() {
customItem.add(new CustomItem("Testing","Application"));
}
public void addToList(View view) {
getText = edit.getText().toString();
st = new StringTokenizer(getText," ");
text1 = st.nextToken().toString();
text2 = st.nextToken().toString();
MainActivity.this.customItem.add(new CustomItem(text1,text2));
MainActivity.this.completeAdapter.notifyDataSetChanged();
}
/*
private class MyListAdapter extends ArrayAdapter<CustomItem> {
private MyListAdapter() {
super(MainActivity.this, R.layout.item_row,myItem);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View itemView = convertView;
if(itemView== null){
itemView = getLayoutInflater().inflate(R.layout.item_row,parent,false);
}
CustomItem customItem = myItem.get(position);
TextView t1 = (TextView) itemView.findViewById(R.id.text1);
TextView t2 = (TextView) itemView.findViewById(R.id.text2);
t1.setText(customItem.getName());
t2.setText(customItem.getAddress());
return itemView;
}
}*/
}
this is my adapter class
class CompleteAdapter extends ArrayAdapter<CustomItem>{
private List<CustomItem> items;
private Context context;
CompleteAdapter(List<CustomItem> items, Context context) {
super (context,R.layout.item_row,items);
this.items = items;
this.context = context;
}
#Override
public int getCount() {
return 0;
}
#Override
public CustomItem getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View v= convertView;
Holder holder = new Holder();
if(convertView == null){
LayoutInflater inflater = (LayoutInflater) context.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.item_row, null);
TextView name_text = (TextView)v.findViewById(R.id.name);
TextView address_text = (TextView)v.findViewById(R.id.address);
holder.nameView = name_text;
holder.addView = address_text;
v.setTag(holder);
}
else
holder = (Holder)v.getTag();
CustomItem custom = items.get(position);
holder.nameView.setText(custom.getName());
holder.addView.setText(custom.getAddress());
return v;
}
private class Holder {
public TextView nameView;
public TextView addView;
}
}
This is my CustomIte.java
class CustomItem{
private String name;
private String address;
CustomItem(String name, String address) {
this.name = name;
this.address = address;
}
public String getName() {
return name;
}
public String getAddress() {
return address;
}}
As you can see I've tried with 2 adapters with the same result. There is data contained in the Strings being passed, so I think the problem is with the adapter. (The ids of all the components are perfect) What changes should I make?
Should change in your Adapter
#Override
public int getCount() {
return 0;
}
#Override
public CustomItem getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
to
#Override
public int getCount() {
return items.size();
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public CustomItem getItem(int position) {
return items.get(position);
}
The problem is in your adapter which return a null view (v)
#Override
public int getCount() {
return items.size();
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public CustomItem getItem(int position) {
return items.get(position);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder;
if(convertView == null){
convertView =LayoutInflater.from(context).inflate(R.layout.item_row, null);
TextView name_text = (TextView)v.findViewById(R.id.name);
TextView address_text = (TextView)v.findViewById(R.id.address);
holder = new Holder();
holder.nameView = name_text;
holder.addView = address_text;
v.setTag(holder);
}
else
holder = (Holder)v.getTag();
CustomItem custom = items.get(position);
holder.nameView.setText(custom.getName());
holder.addView.setText(custom.getAddress());
return convertView ;
}
Hop it helps ;)
I have a listView (vertical) and every list item has a horizontal list view (horizontal).
But the problem is when i scroll the horizontal scrollview in the row the vertical list is also calling getView()...
So, there is a huge performance hit..
So , can any one tell me a better solution to it ..
public class GridViewAdapter extends BaseAdapter {
List<List<Hotel>> gridDatasource;
Context mContext;
public GridViewAdapter(List<List<Hotel>> gridDatasource, Context context) {
this.gridDatasource = gridDatasource;
this.mContext = context;
}
public void setGridDatasource(List<List<Hotel>> gridDatasource) {
this.gridDatasource = gridDatasource;
}
#Override
public int getCount() {
if (gridDatasource == null) {
return 0;
}
return gridDatasource.size();
}
#Override
public Object getItem(int position) {
return gridDatasource.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
GridViewHolder holder;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.gridview_table_cell,
null);
holder = new GridViewHolder();
holder.headerView = (TextView) convertView
.findViewById(R.id.gridViewRowHeader);
holder.listView = (HorizontalListView) convertView
.findViewById(R.id.gridViewHorizontalListView);
convertView.setTag(holder);
} else {
holder = (GridViewHolder) convertView.getTag();
Log.d("TAG", "Reaching Here");
}
holder.headerView.setText("Hello From Sandeep");
HorizontalListViewAdapter adapter = new HorizontalListViewAdapter(
mContext, gridDatasource.get(position));
holder.listView.setAdapter(adapter);
return convertView;
}
}
static class GridViewHolder {
TextView headerView;
HorizontalListView listView;
}
public class HorizontalListViewAdapter extends BaseAdapter {
Context mContext;
List<Hotel> mHotels;
public HorizontalListViewAdapter(Context context, List<Hotel> hotels) {
this.mContext = context;
this.mHotels = hotels;
}
#Override
public int getCount() {
if (mHotels == null) {
return 0;
}
return mHotels.size();
}
#Override
public Object getItem(int position) {
return mHotels.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
HotelCell cell = (HotelCell) convertView;
if (cell == null) {
cell = new HotelCell(mContext);
} else {
Log.d("TAG", "Reached here 2");
}
cell.setHotel(mHotels.get(position));
cell.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(mContext,
HotelDetailActivity.class);
intent.putExtra("DATA", ((HotelCell) v).getHotel());
startActivity(intent);
}
});
cell.setPadding(0, 0, 10, 0);
return cell;
}
}
Dear i suggest to try My this Code
public View getView(final int position, View convertView, ViewGroup parent)
{
View v = convertView;
ViewHolder holder;
if (v == null)
{
v = inflater.inflate(R.layout.custom_image_layout, null);
holder = new ViewHolder();
holder.txtFileName = (TextView) v.findViewById(R.id.txtFileName);
holder.imageView = (ImageView) v.findViewById(R.id.imgView);
v.setTag(holder);
} else
{
holder = (ViewHolder) v.getTag();
}
holder.imageView.setImageBitmap(bm);
holder.txtFileName.setText(""+nameoffile);
return v;
}
static class ViewHolder
{
public ImageView imageView;
public TextView txtFileName;
}
Use The Holder Class