I am new to developing for android, I'm trying to make a ListActivity with title and subtitle.
So far only managed to make the title:
this.data = new ArrayList<String>();
// add some objects into the array list
this.data.add("YOU WILL HEAR");
this.data.add("USEFUL PHRASES");
this.data.add("VOCABULARY");
this.data.add("DIALOGUES");
this.data.add("INFORMATION");
this.port = new ArrayList<String>();
this.port.add("BEM VINDO");
this.port.add("FRASES ÚTEIS");
this.port.add("VOCABULÁRIO");
this.port.add("DIÁLOGOS");
this.port.add("VOCABULÁRIO");
this.setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item,R.id.title,this.data));
ListView lv = getListView();
this code is in the onCreate method.
My question is, how i can populate the R.id.subtitle with the second array?
try the following code:
public ListView lv;
lv = (ListView) findViewById(R.id.ListView01);
lv.setAdapter(adapter);
lv.setTextFilterEnabled(true);
lv.setBackgroundResource(R.drawable.background);
lv.setCacheColorHint(00000000);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
}
});
class MySimpleArrayAdapter extends ArrayAdapter<String> {
private Context context;
public MySimpleArrayAdapter(Context context) {
super(context, R.layout.list);
this.context = context;
}
public int getCount() {
return names.size();
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
if (rowView == null) {
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowView = vi.inflate(R.layout.list, null);
}
TextView name = (TextView) rowView.findViewById(R.id.Name);
TextView number = (TextView) rowView.findViewById(R.id.no);
return rowView;
}
}
Related
I have 3 classes relating to my checkbox section of my app in Android studio, atm the check box loads, but when selecting and deselecting the value doesn't save when I go bak into it from the main menu. any help would great!!!
public class WatchList extends AppCompatActivity {
ArrayList dataModels;
ListView listView;
private WatchListAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
Log.i("watchlist", "created watchlist activity");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_watch_list);
listView = (ListView) findViewById(R.id.listview2);
dataModels = new ArrayList();
dataModels.add(new WatchListClass(R.drawable.kookaburra,"Kookaburra","Albury", false));
dataModels.add(new WatchListClass(R.drawable.cockatoo, "Cockatoo" , "Bathurst", true));
dataModels.add(new WatchListClass(R.drawable.emu,"Emu", "Echuca", true));
dataModels.add(new WatchListClass(R.drawable.magpie, "Magpie", "Sydney", true));
adapter = new WatchListAdapter(dataModels, getApplicationContext());
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
WatchListClass dataModel= (WatchListClass) dataModels.get(position);
dataModel.checked = !dataModel.checked;
adapter.notifyDataSetChanged();
}
});
}
}
public class WatchListAdapter extends ArrayAdapter {
private ArrayList dataSet;
Context mContext;
private static class ViewHolder {
TextView birdWatchName, birdWatchLocation;
ImageView birdWatchImage;
CheckBox checkBox;
}
public WatchListAdapter(ArrayList data, Context context) {
super(context, R.layout.watch_list, data);
this.dataSet = data;
this.mContext = context;
}
#Override
public int getCount() {
return dataSet.size();
}
#Override
public WatchListClass getItem(int position) {
return (WatchListClass) dataSet.get(position);
}
#Override
public View getView(int position, View convertView, #NonNull ViewGroup parent) {
ViewHolder viewHolder;
final View result;
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.watch_list, parent, false);
viewHolder.birdWatchImage = (ImageView) convertView.findViewById(R.id.birdWatchImage);
viewHolder.birdWatchName = (TextView) convertView.findViewById(R.id.birdWatchName);
viewHolder.birdWatchLocation = (TextView) convertView.findViewById(R.id.birdWatchLocation);
viewHolder.checkBox = (CheckBox) convertView.findViewById(R.id.checkbox);
result=convertView;
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
result=convertView;
}
WatchListClass item = getItem(position);
viewHolder.birdWatchImage.setImageResource(item.birdWatchImage);
viewHolder.birdWatchName.setText(item.birdWatchName);
viewHolder.birdWatchLocation.setText(item.birdWatchLocation);
viewHolder.checkBox.setChecked(item.checked);
return result;
}
}
public class WatchListClass {
public String birdWatchName, birdWatchLocation;
int birdWatchImage;
boolean checked;
WatchListClass(int birdWatchImage, String birdWatchName,String birdWatchLocation, boolean checked) {
this.birdWatchName = birdWatchName;
this.birdWatchLocation = birdWatchLocation;
this.birdWatchImage = birdWatchImage;
this.checked = checked;
}
}
u can user shared preferences for check Box
try this one
How to save checkbox value with shared preferences?
you can use local database in app to store check box values and retrieve it back.
I have a ListView and a CustomAdapter. The elements are all successfully loaded into the list. Now I want to change the background color of a certain element of the list by clicking on an external button. But I do not know how to access a specific item in the list.
Here is the CustomAdapter class:
public class CustomAdapter extends BaseAdapter {
private Context ctx;
private int resource;
private List<ItemModel> items;
public PreorderListAdapter(Context context, int resource, List<ItemModel> items){
this.ctx = context;
this.resource = resource;
this.items = items;
}
#Override
public int getCount() {
return items.size();
}
#Override
public ItemModel getItem(int position) {
return items.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#NonNull
#Override
public View getView(int i, View convertView, #NonNull ViewGroup parent) {
View view = convertView;
if(view == null){
LayoutInflater inflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(resource, null);
}
TextView text1 = (TextView) view.findViewById(R.id.text1);
TextView text2 = (TextView) view.findViewById(R.id.text2);
TextView text3 = (TextView) view.findViewById(R.id.text3);
ItemModel item = items.get(i);
text1.setText(item.getName());
text2.setText(item.getOption2());
text3.setText(item.getOption3());
return view;
}
}
You can do it like this inside your getView() method
view.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
view.setBackgroundColor(ContextCompat.getColor(this, R.color.yourcolor));
}
});
If you have a button on your view then performs the listener on that button
If you want to get your selected item view from your parent activity then :
yourlistview.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> parent,View view, int position, long id)
{
selectedposition = position ;
}
});
View view = listView.getAdapter().getView(selectedposition,null,listview);
Then change its background:
view.setBackgroundColor(ContextCompat.getColor(this, R.color.yourcolor));
please define your color in your color.xml file
If you have more than one view then , create an ArrayList<View> and do some loop
create a custom listener interface in your activity and your
adapter will implement this.
public interface OnClickListenerFromActivity {
void onActivityButtonClick(int position);
}
on click in your button call your listener's method
mOnClickListenerFromActivity.onActivityButtonClick(mList.getItem(yourPostion));
implement this listener into your adapter
public class CustomAdapter extends BaseAdapter implements Activity.OnClickListenerFromActivity {
private Context ctx;
private int resource;
private List<ItemModel> items;
public PreorderListAdapter(Context context, int resource, List<ItemModel> items){
this.ctx = context;
this.resource = resource;
this.items = items;
}
#Override
public int getCount() {
return items.size();
}
#Override
public ItemModel getItem(int position) {
return items.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#NonNull
#Override
public View getView(int i, View convertView, #NonNull ViewGroup parent) {
View view = convertView;
if(view == null){
LayoutInflater inflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(resource, null);
}
TextView text1 = (TextView) view.findViewById(R.id.text1);
TextView text2 = (TextView) view.findViewById(R.id.text2);
TextView text3 = (TextView) view.findViewById(R.id.text3);
ItemModel item = items.get(i);
text1.setText(item.getName());
text2.setText(item.getOption2());
text3.setText(item.getOption3());
return view;
}
public void onActivityButtonClick(int position) {
// get your item through position and
// set your color here
}
}
I want to add every element of an arrayList to a listView ,Here I am passing an arrayList to the adapter which contains package name and size ,
How to iterate and display all the items in the listView.
public class CCacheAdapter extends ArrayAdapter<CCacheInfo>
{
private ArrayList<CCacheInfo> arrayList;
private Context mContext;
public CCacheAdapter(Context context, ArrayList<CCacheInfo> cacheInfos)
{
super(context,0, cacheInfos);
mContext=context;
arrayList=cacheInfos;
}
#NonNull
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
CCacheInfo cCacheInfo = getItem(position);
ViewHolder oViewHolder;
if (convertView == null)
{
convertView = LayoutInflater.from(getContext()).inflate(R.layout.cache_items, parent, false);
oViewHolder =new ViewHolder();
oViewHolder.mPackageName = (TextView)convertView.findViewById(R.id.package_name);
oViewHolder.mPackageSize = (TextView)convertView.findViewById(R.id.package_size);
oViewHolder.mPackageIcon = (ImageView)convertView.findViewById(R.id.appIcon);
oViewHolder.mCheckbox = (CheckBox)convertView.findViewById(R.id.checkbox);
convertView.setTag(oViewHolder);
}else
{
oViewHolder = (ViewHolder)convertView.getTag();
}
oViewHolder.mPackageName.setText(cCacheInfo.m_szAppName);
oViewHolder.mPackageSize.setText(CCleanTool.formatShortFileSize(mContext, cCacheInfo.m_nSize));
return convertView;
}
private class ViewHolder
{
TextView mPackageName;
TextView mPackageSize;
CheckBox mCheckbox;
ImageView mPackageIcon;
}
}
Just set the adapter to ListView, like the following
ArrayList<CCacheInfo> cacheInfos = ... // you get your data from somewhere
ListView listView = (ListView) findViewById(R.id.list_view);
CCacheAdapter adapter = new CCacheAdapter(this, cacheInfos);
listView.setAdapter(adapter);
Android not parsing JSON data into ListView, I am using this tutorial and just made few changes in ListViewAdapter.java
Like in my new implementation i used ViewHolder, and my code looks like this:
public class ListViewAdapter extends BaseAdapter {
// Declare Variables
Context context;
ArrayList<HashMap<String, String>> data;
ImageLoader imageLoader;
HashMap<String, String> resultp = new HashMap<String, String>();
ViewHolder holder;
public ListViewAdapter(Context context,
ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
data = arraylist;
imageLoader = new ImageLoader(context);
}
#Override
public int getCount() {
return data.size();
}
#Override
public Object getItem(int position) {
return data.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
static class ViewHolder {
public ViewHolder(View convertView) {
// TODO Auto-generated constructor stub
}
TextView rank;
TextView country;
TextView population;
ImageView flag;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// Declare Variables
// Avoid unneccessary calls to findViewById() on each row, which is expensive!
holder = null;
/*
* If convertView is not null, we can reuse it directly, no inflation required!
* We only inflate a new View when the convertView is null.
*/
if (convertView == null) {
convertView = ((Activity) context).getLayoutInflater().inflate(R.layout.listview_item, null);
// Create a ViewHolder and store references to the two children views
holder = new ViewHolder(convertView);
holder.rank = (TextView) convertView.findViewById(R.id.rank);
holder.country = (TextView) convertView.findViewById(R.id.country);
holder.population = (TextView) convertView.findViewById(R.id.population);
// Locate the ImageView in listview_item.xml
holder.flag = (ImageView) convertView.findViewById(R.id.flag);
// The tag can be any Object, this just happens to be the ViewHolder
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Capture position and set results to the TextViews
holder.rank.setText(resultp.get(MainActivity.RANK));
holder.country.setText(resultp.get(MainActivity.COUNTRY));
holder.population.setText(resultp.get(MainActivity.POPULATION));
// Capture position and set results to the ImageView
// Passes flag images URL into ImageLoader.class
imageLoader.DisplayImage(resultp.get(MainActivity.FLAG), holder.flag);
// Capture ListView item click
return convertView;
}
}
Edited: Click on ListItem code
#Override
protected void onPostExecute(Void args) {
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listview);
// Pass the results into ListViewAdapter.java
adapter = new ListViewAdapter(MainActivity.this, arraylist);
// Set the adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
listview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// code to handle click
}
});
}
But i don't no why i am not getting data into ListView !
The issue is that you are not assigning the HashMap to `resultp that has the information you want to display
public View getView(final int position, View convertView, ViewGroup parent) {
holder = null;
if (convertView == null) {
convertView = ((Activity) context).getLayoutInflater().inflate(R.layout.listview_item, null);
holder = new ViewHolder(convertView);
holder.rank = (TextView) convertView.findViewById(R.id.rank);
holder.country = (TextView) convertView.findViewById(R.id.country);
holder.population = (TextView) convertView.findViewById(R.id.population);
holder.flag = (ImageView) convertView.findViewById(R.id.flag);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// Here's the change
resultp = data.get(position);
// Here's the change
holder.rank.setText(resultp.get(MainActivity.RANK));
holder.country.setText(resultp.get(MainActivity.COUNTRY));
holder.population.setText(resultp.get(MainActivity.POPULATION));
imageLoader.DisplayImage(resultp.get(MainActivity.FLAG), holder.flag);
return convertView;
}
To attach OnItemClickListener to your ListView, in the Activity that contains the ListView, add the following:
public class MyActivity implements OnItemClickListener{
ListView lv;
#Override
public void onCreate(Bundle savedInstanceState() {
....
....
// lv initialized here
// adapter of lv set here
attachListeners();
}
private void attachListeners() {
....
....
// attach listeners to other views if you like
lv.setOnItemClickListener(this);
}
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// code to handle click
}
}
Or, if you don't want your Activity to implement OnItemClickListener, then,
public class MyActivity {
ListView lv;
#Override
public void onCreate(Bundle savedInstanceState() {
....
....
// lv initialized here
// adapter of lv set here
attachListeners();
}
private void attachListeners() {
....
....
// attach listeners to other views if you like
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// code to handle click
}
});
}
}
First of all try to fix this:
#Override
public Object getItem(int position) {
return data.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
Instead of using images like in this example I found from Android Developer Site, I want to use edit texts in the gridView. What kind of adapter would I use? Do I even need an adapter?
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new ImageAdapter(this));
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
Toast.makeText(HelloGridView.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
}
Ok, so i tried doing it, but its not working. It keeps crashing.
#imports....
public class MainActivity extends Activity{
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scout);
GridView gridView = (GridView) findViewById(R.id.gridView);
//final String[] letters = new String[]{"A", "B", "C", "D", "E", "F", "G", "H", "I"};
//ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, letters);
gridView.setAdapter(new ImageAdapter(this));
gridView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
Toast.makeText(getApplicationContext(), ((TextView) v).getText(), Toast.LENGTH_SHORT).show();
}
});
}
}
ImageAdapter.java
//used for adding Edit texts to the grid view in the main activity
#imports....
public class ImageAdapter extends BaseAdapter{
Context context;
public ImageAdapter(Context context)
{
this.context = context;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View gridView;
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if(convertView == null)
{
gridView = new View(context);
gridView = inflater.inflate(R.layout.grid_items, null);
EditText editText = (EditText) gridView.findViewById(R.id.grid_item_edit_text);
}
gridView = (View)convertView;
return gridView;
}
#Override
public int getCount() {
return 9;//only 9 pegs on the center rack
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
}
You need a custom Gridview. In another word a Custom Adapter
This tutorial will help you.