I am trying to create an onDisimiss listener to my app as for now this is what i have
The activity
public class listview_test extends Activity {
ListView list;
String[] web = {
"Google Plus",
"Twitter",
"Windows",
} ;
Integer[] imageId = {
R.drawable.ic_launcher,
R.drawable.icon,
R.drawable.ic_launcher,
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_test);
final CustomList adapter = new
CustomList(listview_test.this, web, imageId);
list=(ListView)findViewById(R.id.list);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(listview_test.this, "You Clicked at " +web[+ position], Toast.LENGTH_SHORT).show();
}
});
SwipeDismissListViewTouchListener touchListener =
new SwipeDismissListViewTouchListener(
list,
new SwipeDismissListViewTouchListener.DismissCallbacks() {
#Override
public boolean canDismiss(int position) {
return true;
}
#Override
public void onDismiss(ListView listView, int[] reverseSortedPositions) {
for (int position : reverseSortedPositions) {
adapter.remove(adapter.getItem(position));
}
adapter.notifyDataSetChanged();
}
}
);
list.setOnTouchListener(touchListener);
// Setting this scroll listener is required to ensure that during ListView scrolling,
// we don't look for swipes.
list.setOnScrollListener(touchListener.makeScrollListener());
}
}
And the custom adapter
public class CustomList extends ArrayAdapter<String>{
private final Activity context;
private final String[] web;
private final Integer[] imageId;
public CustomList(Activity context,
String[] web, Integer[] imageId) {
super(context, R.layout.weather_item, web);
this.context = context;
this.web = web;
this.imageId = imageId;
}
#Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View rowView= inflater.inflate(R.layout.weather_item, null, true);
TextView txtTitle = (TextView) rowView.findViewById(R.id.city);
ImageView imageView = (ImageView) rowView.findViewById(R.id.info_image);
txtTitle.setText(web[position]);
imageView.setImageResource(imageId[position]);
return rowView;
}
For some reason every time i am swiping an item to dismiss it force closes and gives me this exception
java.lang.UnsupportedOperationException
In this line
adapter.remove(adapter.getItem(position));
java.lang.UnsupportedOperationException
is thrown when you back an Adapter by an array or non-modifiable List. Since you cannot change their size, deleting is impossible.
Instead, modify your Adapter so it accepts a List instead of an array and make sure that the List you pass off is fully flexible.
Something like
List <String> web = new ArrayList <String> ();
web.add ("Google Plus");
web.add ("Twitter");
//etc.
is enough to ensure a flexible list.
This means that your CustomList adapter should also call up to the superclass constructor that also accepts in a List, which in this case is
public ArrayAdapter (Context context, int resource, List<T> objects)
For more information refer to the ArrayAdapter documentation.
Related
I am an intern at this company and I have a task assigned to me by my team leader where I need to make an app that displays a list of items that I can add to and edit/delete the items on the list. I am following the requirements given to me on what the app needs to do.
The problem I'm having is that I need to pass values from an item when clicked on a ListView which uses a custom adapter, and have them sent to a new activity and displayed on the new activity's textviews and imageview. I have tried using putExtras() methods in the list click method and getting the values using getExtras() methods but they didn't work and I've already deleted those codes, so they are no longer there. If you need more of the classes/activities I'm using please let me know. I am using Android Studio 3.1.4
ItemListView.java
public class ItemListView extends AppCompatActivity {
DatabaseHelper myDB;
ArrayList<Item> itemList;
ListView listView;
Item item;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_item_list_view);
listView = (ListView) findViewById(R.id.listView);
myDB = new DatabaseHelper(this);
itemList = new ArrayList<>();
Cursor data = myDB.getListContents();
int numRows = data.getCount();
if(numRows == 0){
Toast.makeText(ItemListView.this, "There is nothing in the database.", Toast.LENGTH_LONG).show();
} else {
while(data.moveToNext()){
item = new Item(data.getString(1), data.getString(2), data.getString(3));
itemList.add(item);
}
Row_ListAdapter adapter = new Row_ListAdapter(this, R.layout.list_adapter_view, itemList);
listView = (ListView) findViewById(R.id.listView);
listView.setAdapter(adapter);
}
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(ItemListView.this, ViewItemClicked.class);
startActivity(intent);
}
});
}
ViewItemClicked.java
I want the values displayed onto the layout of this activity when a row is clicked.
public class ViewItemClicked extends AppCompatActivity {
ImageView image;
TextView name, desc;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_item_clicked);
}
}
Other classes I used:
Row_ListAdapter.java
public class Row_ListAdapter extends ArrayAdapter<Item> {
private LayoutInflater mInflater;
private ArrayList<Item> items;
private int mViewResourceId;
ImageView image;
TextView name;
TextView description;
public Row_ListAdapter(Context context, int textViewResourceId, ArrayList<Item> items){
super(context, textViewResourceId, items);
this.items = items;
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mViewResourceId = textViewResourceId;
}
public View getView(int position, View convertView, ViewGroup parents){
convertView = mInflater.inflate(mViewResourceId, null);
Item item = items.get(position);
if(item != null){
image = (ImageView) convertView.findViewById(R.id.iconIV);
name = (TextView) convertView.findViewById(R.id.nameTV);
description = (TextView) convertView.findViewById(R.id.descTV);
if(image != null){
image.setImageBitmap(item.getImage());
}
if(name != null){
name.setText(item.getName());
}
if(description != null){
description.setText(item.getDescription());
}
}
return convertView;
}
}
Link to GUI: https://i.stack.imgur.com/wHfgv.png
Before you pass the data, implement your Item Class with Serializable like this:
public class Item implements Serializable{
/*your class code here*/
}
Then pass the data in the listView.setOnItemClicklistener like this
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Item passItem = itemList.get(position);
Intent intent = new Intent(ItemListView.this, ViewItemClicked.class);
Bundle itemBundle = new Bundle();
itemBundle.putSerializable("dataItem",passItem)// put the data and define the key
intent.putExtras(itemBundle)
startActivity(intent);
}
});
and to open the data in the ViewItemClicked.Class
public class ViewItemClicked extends AppCompatActivity {
ImageView image;
TextView name, desc;
Item item;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
item = (Item) getIntent().getSerializableExtra("dataItem"); // use the key
setContentView(R.layout.activity_view_item_clicked);
/*now u can use the item data*/
}
}
Try the codes below:
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(ItemListView.this, ViewItemClicked.class);
String name = itemList.get(position).getString(1);
String description = itemList.get(position).getString(2);
String something_else = itemList.get(position).getString(3);
intent.putExtra("name", name);
intent.putExtra("description", description);
intent.putExtra("something_else", something_else);
startActivity(intent);
}
In your Details Activity:
Intent intent = getIntent();
String name = intent.getStringExtra("name");
String description = intent.getStringExtra("description");
String something_else = intent.getStringExtra("something_else");
Now use the strings to show the values in the desired places.
as
edittext.setText(name);
WHAT FORMAT TYPE OF IMAGE YOUR ARE USING
Is it Base64 or Bitmap if it is Base64 try this code..
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(ItemListView.this, ViewItemClicked.class);
String name = list.get(position).getName();
String description = list.get(position).getDescription();
String image= list.get(position).getImage();
startActivity(intent);
}
In Your Second Activity use this code..
Intent intent = getIntent();
String name = intent.getStringExtra("name");
String description = intent.getStringExtra("description");
String image = intent.getStringExtra("image");
Convert here Base64 to Bitmap..
byte[] decodedString = Base64.decode(image, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0,
decodedString.length);
Define an interface for listening item click event
public class Row_ListAdapter extends ArrayAdapter<Item> {
private LayoutInflater mInflater;
private ArrayList<Item> items;
private int mViewResourceId;
ImageView image;
TextView name;
TextView description;
OnItemListener mListener;
public Row_ListAdapter(Context context, int textViewResourceId, ArrayList<Item> items){
super(context, textViewResourceId, items);
this.items = items;
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mViewResourceId = textViewResourceId;
}
public View getView(int position, View convertView, ViewGroup parents){
convertView = mInflater.inflate(mViewResourceId, null);
Item item = items.get(position);
if(item != null){
image = (ImageView) convertView.findViewById(R.id.iconIV);
name = (TextView) convertView.findViewById(R.id.nameTV);
description = (TextView) convertView.findViewById(R.id.descTV);
if(image != null){
image.setImageBitmap(item.getImage());
}
if(name != null){
name.setText(item.getName());
}
if(description != null){
description.setText(item.getDescription());
}
}
convertView.setOnClickListener((v) -> {
if(mListener != null) {
mListener.onItemClick(v, item);
}
})
return convertView;
}
public void setOnItemListener(OnItemListener listener) {
mListener = listener;
}
public interface OnItemClickListener {
void onItemClick(View v, Item item);
}
}
Then, implement OnItemClickListener in the activity and set it to the adapter:
Row_ListAdapter adapter = new Row_ListAdapter(this, R.layout.list_adapter_view, itemList);
adapter.setOnItemListener("your implement");
I want to hide the 2nd option from the list on switch on off, I know how switch works, just tell me how to hide-unhide the option from the list. I want to hide list view item by item position or something like that.
New query : Is it possible to add two different adapter and switch them on switch preference change? if yes then how to do that?
This is 100% possible.
String [] titles = {"abc","def","ghi"};
String [] descriptions = {"abc","def","ghi"};
int [] images = {R.drawable.ic_abc,R.drawable.ic_def,R.drawable.ic_ghi};
ListView lv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view);
lv = (ListView) findViewById(R.id.listView);
final Adapter adapter = new Adapter(getApplicationContext(), titles, descriptions, images);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
});
}
List view adapter
class Adapter extends ArrayAdapter {
int[] imageArray;
String[] titleArray;
String[] descriptionArray;
public Adapter(Context context, String[] titles1, String [] description1, int[] img1) {
super(context, R.layout.list_row, R.id.Titles, titles1);
this.imageArray = img1;
this.titleArray = titles1;
this.descriptionArray = description1;
}
#NonNull
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = inflater.inflate(R.layout.list_row,parent,false);
ImageView myImage = (ImageView) row.findViewById(R.id.Icons);
TextView myTitle = (TextView) row.findViewById(R.id.Titles);
TextView myDescription = (TextView) row.findViewById(R.id.Descriptions);
myImage.setImageResource(imageArray[position]);
myTitle.setText(titleArray[position]);
myDescription.setText(descriptionArray[position]);
return row;
}
}
Switch preference
public SwitchPreference sw;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.pref_sw);
sw = (SwitchPreference) findPreference("001");
}
on switch on/off in main activity
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
boolean sw = sharedPreferences.getBoolean("001", true);
if (sw) {
//hide list view item (only one)
} else {
//unhide list view item (only one)
}
Well, take a look, so you can call remove properly:
class Adapter extends ArrayAdapter {
List<ItemObject> data = new ArrayList();
public Adapter(Context context, String[] titles1, String [] description1, int[] img1) {
super(context, R.layout.list_row, R.id.Titles, titles1);
for(int i = 0; i < titles1.lenght; i++)
data.add(new ItemObject(titles1[i], description1[i], img1[i]);
}
static class ItemObject {
String title, description;
int image;
ItemObject(String ti, String desc, int img) {
title = ti;
description = desc;
image = img;
}
}
//plus the rest of your class
And change at getView
ItemObject row = data.get(position);
myImage.setImageResource(row.image);
myTitle.setText(row.title);
myDescription.setText(row.description);
And add this method in the adapter:
public void removeObject(int at) {
data.remove(at);
notifyDataSetChanged();
}
So you can call removeObject with a position.
I made a listview in Android Studio. The listview has a image in every item but I don't know how to make it clickable. I did browse the internet for a solution but the hard part seems to be implementing it in my own code. I cannot figure that out.
Image in question = ex_img
-- Keep in mind when the image is clicked, it should also know its position in the list.
Thanks for reading and I hope you can help me out.
Adapter for list:
public class CustomList extends ArrayAdapter<String> {
private String[] ex_name;
private String[] ex_diff;
private String[] ex_muscle;
private String[] ex_dpr;
private Integer[] ex_img;
private Activity context;
public CustomList(Activity context, String[] ex_name, String[] ex_diff, String[] ex_muscle, String[] ex_dpr,
Integer[] ex_img) {
super(context, R.layout.row_layout, ex_name);
this.context = context;
this.ex_name = ex_name;
this.ex_muscle = ex_muscle;
this.ex_diff = ex_diff;
this.ex_dpr = ex_dpr;
this.ex_img = ex_img;
}
//LIST --> XML
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View listViewItem = inflater.inflate(R.layout.row_layout, null, true);
TextView list_name = (TextView) listViewItem.findViewById(R.id.ex_name);
TextView list_diff = (TextView) listViewItem.findViewById(R.id.ex_diff);
TextView list_muscle = (TextView) listViewItem.findViewById(R.id.ex_muscle);
ImageView list_image = (ImageView) listViewItem.findViewById(R.id.ex_img);
TextView list_dpr = (TextView) listViewItem.findViewById(R.id.ex_dpr);
list_name.setText(ex_name[position]);
list_muscle.setText(ex_muscle[position]);
list_diff.setText(ex_diff[position]);
list_dpr.setText(ex_dpr[position]);
list_image.setImageResource(ex_img[position]);
return listViewItem;
}
}
Part from MainActivity that might be needed:
private Integer img[] = {
R.drawable.ic_favorite_white_24dp,
R.drawable.ic_location_on_white_24dp,
R.drawable.ic_update_white_24dp,
R.drawable.ic_local_dining_white_24dp,
R.drawable.ic_local_dining_white_24dp
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CustomList customList = new CustomList(this, name, diff, muscle, dpr, img);
listView = (ListView) findViewById(R.id.listview);
listView.setAdapter(customList);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Toast.makeText(getApplicationContext(),"You Clicked "+name[i],Toast.LENGTH_SHORT).show();
}
});
}
Add onClickListener to your ImageView in getView() -
list_image.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//Here you have the position too.
});
Just make the position parameter final in getView()
I have a ListActivity and a custom adapter that extends BaseAdapter.
On each row of the ListView, there is a button and a few more views. onClickListener is declared in the adapter.
How can I refresh list view after button is clicked ?
Here is the code
List Activity:
.........
super.onCreate(savedInstanceState);
here im reading content from a file and then creating adapter with that content
adapter = new UvArrayAdapter(this, strarray3, strarray2, intarray);
setListAdapter(adapter);
..........
Adapter:
.......
public class UvArrayAdapter extends BaseAdapter {
private Context mContext;
private LayoutInflater linflater;
private TextView txt_1, txt_2, txt_3;
private ProgressBar pr1;
private String[] str1;
private String[] str2;
private String[] str3;
private Integer[] int1;
private class OnItemClickListener implements OnClickListener{
private int mPosition;
OnItemClickListener(int position){
mPosition = position;
}
#Override
public void onClick(View arg0) {
Log.v("TAG", "onItemClick at position" + mPosition);
}
}
public UvArrayAdapter(Context context, String[] s1, String[] s2, Integer[] i1) {
mContext = context;
str1 = s1;
str2 = s2;
int1 = i1;
linflater = LayoutInflater.from(context);
}
#Override
public int getCount() {
return str1.length;
}
#Override
public Object getItem(int arg0) {
return str1[arg0];
}
#Override
public long getItemId(int arg0) {
return arg0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = linflater.inflate(R.layout.uv_rowlayout, null);
}
convertView.setOnClickListener(new OnItemClickListener(position));
txt_1 = (TextView) convertView.findViewById(R.id.textView1);
pr1 = (ProgressBar) convertView.findViewById(R.id.progressBar1);
pr1.setProgress(int1[position]);
txt_1.setText(str1[position]);
txt_2 = (TextView) convertView.findViewById(R.id.textView2);
txt_2.setText(str2[position]+"mV");
Button btn = (Button) convertView.findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
Log.v("onClickListener", "button - clicked at position " position);
do some changes in mentioned file and after that i need to update the list view with new data
}});
return convertView;
}
}
adapter.notifyDataSetChanged(); // to notify the adapter that your data has been updated
Note: If you get any errors with the above line, you could try the following code (where mListView is the name of my ListView object)
((BaseAdapter) mListView.getAdapter()).notifyDataSetChanged();
Another way would be to invalidate the List so that it is redrawn form the updated data set once again.
mListView=(ListView) findViewById(R.id.MyListView);
mListView.invalidate();
Use notifyDataSetChanged()
adapter = new UvArrayAdapter(this, strarray3, strarray2, intarray);
setListAdapter(adapter);
UvArrayAdapter.notifyDataSetChanged();
// To make the adapter aware of the changes
Hi its my first post here nad my first a little bit more advanced app for my Android phone... I know that this subject was mentioned here, google knows many examples, however they are not exacty what im looking form ;(
I admit I'm a n00000b... in terms of Android coding... I started... ust few days ago, please forgive me :)
The problem is that my listview element is not beeing populated. App compiles and runs without errors, BUT it doesnt lunch getView. From what i have read on the web... I need this to display my beloved listview with its content...
Please help :)
package com.test.stackParser;
public class StackParserActivity extends Activity {
/** Called when the activity is first created. */
private ProgressDialog pd;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//final TextView tv = (TextView) findViewById(R.id.textView1);
//tv.setMovementMethod(new ScrollingMovementMethod());
Button button = (Button)findViewById(R.id.button1);
button.setOnClickListener(myListener);
}
private OnClickListener myListener = new OnClickListener() {
public void onClick(View v) {
pd = ProgressDialog.show(StackParserActivity.this, "Working...", "request to server", true, false);
new ParseSite().execute("http://multikino.pl/pl/repertuar/warszawa-ursynow/2011-09-02/");
}
};
private class ParseSite extends AsyncTask<String, Void, List<String>> {
protected List<String> doInBackground(String... arg) {
List<String> output = new ArrayList<String>();
try
{
HtmlHelper hh = new HtmlHelper(new URL(arg[0]));
List<TagNode> links = hh.getLinksByClass("title");
for (Iterator<TagNode> iterator = links.iterator(); iterator.hasNext();)
{
TagNode divElement = (TagNode) iterator.next();
output.add(divElement.getText().toString());
}
Log.d("dupa", "siteParsed");
}
catch(Exception e)
{
e.printStackTrace();
}
return output;
}
protected void onPostExecute(List<String> output) {
pd.dismiss();
Log.d("dupa", "postExecute");
ListView listview = (ListView) findViewById(R.id.listViewData);
//listview.setAdapter(new ArrayAdapter<String>(StackParserActivity.this, android.R.layout.simple_list_item_1 , output));
MyAdapter dupa = new MyAdapter(StackParserActivity.this, android.R.layout.simple_list_item_1, R.id.movieTitle, output);
dupa.notifyDataSetChanged();
listview.setAdapter(dupa);
dupa.notifyDataSetChanged();
}
}
private class MyAdapter extends ArrayAdapter<string> {
String[] tabObj;
public MyAdapter(Context context, int resource, int textViewResourceId, List<String> output) {
super(context, resource, textViewResourceId);
tabObj = output.toArray(new String[]{});
Log.d("dupa", tabObj[2].toString());
notifyDataSetChanged();
// TODO Auto-generated constructor stub
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Log.d("dupa", "!!!!getView");
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = inflater.inflate(R.layout.row_layout,parent,false);
TextView tv = (TextView) row.findViewById(R.id.movieTitle);
tv.setText(tabObj[position]);
//Button buton1 = (Button) row.findViewById(R.id.buttonInfo);
//Button button2 = (Button) row.findViewById(R.id.buttonReserve);
return super.getView(position, convertView, parent);
}
};
}
Return row from getView method. Also remove the notifyDatasetChanged() from the MyAdapter constructor.
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Log.d("dupa", "!!!!getView");
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = inflater.inflate(R.layout.row_layout,parent,false);
TextView tv = (TextView) row.findViewById(R.id.movieTitle);
tv.setText(tabObj[position]);
//Button buton1 = (Button) row.findViewById(R.id.buttonInfo);
//Button button2 = (Button) row.findViewById(R.id.buttonReserve);
return row;
}
EDIT :
Try overriding getCount in adapter where you return the size() of tabObj
Since you set the adapter onPostExecute, there is no need to set notifyDataChanged in any of the places that you call it.
The reason that notifyDataChanged is used is to notify the adapter that has been set to a listview that the data have changed and you should update it. Hope this helps!
private class MyAdapter extends ArrayAdapter<string> {
String[] tabObj;
public MyAdapter(Context context, int resource, int textViewResourceId, List<String> output) {
super(context, resource, textViewResourceId);
tabObj = output.toArray(new String[]{});
When we are creating a custom arrayadapter we must be using either
public ArrayAdapter (Context context, int textViewResourceId, T[] objects)
public ArrayAdapter (Context context, int resource, int textViewResourceId, T[] objects)
public ArrayAdapter (Context context, int textViewResourceId, List<T> objects)
public ArrayAdapter (Context context, int resource, int textViewResourceId, List<T> objects)
if we are not using above mention adapter, we need to override getCount() method.
In your case,
super(context, resource, textViewResourceId,output);
will solve your problem.