Develop Reference

Start chronometer on each row of Listview in android

I have list items on one list layout among items i have there is a chronometer that i need to start on each row ,other items come from database, but when activity launches Chronometer stays on 00:00. Please help me , i did many research some tell me that in can use adapter but i am not familiar with it, i don't know if there is not another way to do it without using adapter .
MainActivity .java:
private ArrayList<HashMap<String, String>> userList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myList = (ListView)findViewById(R.id.listView);
inflatedView =
getLayoutInflater().inflate(R.layout.payement_timing_list_adapter_view, null);
chronometer = (Chronometer)
inflatedView.findViewById(R.id.chronometer);
if (userList.size() != 0) {
//Set the User Array list in ListView
adapter = new SimpleAdapter(getApplicationContext(), userList, R.layout.payement_timing_list_adapter_view,
new String[]{"Driver_fullname", "plate_no", "parking_name"},
new int[]{R.id.drivername, R.id.plateno, R.id.pname});
myList.setAdapter(adapter);
}
myList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent,
View view, int position, long id) {
Log.d("My POSITION",""+position);
((Chronometer)inflatedView.findViewById(R.id.chronometer)).myList.
(position).start();
chronometer.start();
}
});

You will need to use a custom adapter for your ListView, and declare the Chronometer in the getView method for each row.
A custom adapter could be onle like this:
public class CustomAdapter extends BaseAdapter{
ArrayList<HashMap<String, String>> users;
Context context;
private static LayoutInflater inflater=null;
public CustomAdapter(MainActivity mainActivity, ArrayList<HashMap<String, String>> usersList) {
// TODO Auto-generated constructor stub
users = usersList;
context=mainActivity;
inflater = ( LayoutInflater )context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return items.length;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public class Holder
{
TextView tv;
...
Chronometer cr;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder holder=new Holder();
View rowView;
//Create a custom layout for your row view with the chronometer on it and get it here
rowView = inflater.inflate(R.layout.custom_row_item, null);
holder.tv=(TextView) rowView.findViewById(R.id.textView1);
...
holder.cr=(Chronometer) rowView.findViewById(R.id.chronometer);
cr.start();
holder.tv.setText("GET THE TEXT YOU NEED FROM USERS LIST HERE");
return rowView;
}
}
Then declare and use your custom adapter like:
CustomAdapter myAdapter = new CustomAdapter(YourActivity.this, userList);
myList.setAdapter(myAdapter);
Hope it helps :)

NullPointerException on trying to save SparceBooleanArray

Here's the code of my baseadapter which shows contacts' name, phone number and checkboxes alongside them.
class MyAdapter extends BaseAdapter implements CompoundButton.OnCheckedChangeListener
{ public SparseBooleanArray mCheckStates;
LayoutInflater mInflater;
TextView tv1,tv;
CheckBox cb;
int mPos;
MyAdapter()
{
if (mCheckStates==null){
mCheckStates = new SparseBooleanArray(name1.size());
}else {
mCheckStates = (SparseBooleanArray) bundle.getParcelable("myBooleanArray");
}
mInflater = (LayoutInflater) ContactActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return name1.size();
}
public void setPosition(int p){
mPos = p;
}
public int getPosition(){
return mPos;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View vi=convertView;
if(convertView==null)
vi = mInflater.inflate(R.layout.row, null);
tv= (TextView) vi.findViewById(R.id.textView1);
tv1= (TextView) vi.findViewById(R.id.textView2);
cb = (CheckBox) vi.findViewById(R.id.checkBox1);
tv.setText("Name :"+ name1.get(position));
tv1.setText("Phone No :"+ phno1.get(position));
cb.setTag(position);
cb.setChecked(mCheckStates.get(position, false));
setPosition(position);
cb.setOnCheckedChangeListener(this);
return vi;
}
public boolean isChecked(int position) {
return mCheckStates.get(position, false);
}
public void setChecked(int position, boolean isChecked) {
mCheckStates.put(position, isChecked);
}
public void toggle(int position) {
setChecked(position, !isChecked(position));
}
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
}
}
Activity code:
#Override
public void onDestroy(){
bundle.putParcelable("myBooleanArray", new SparseBooleanArrayParcelable(adapter.mCheckStates));
//adapter is the MyAdapter object created in parent class
super.onDestroy();
}
Note that I'm using bundle.putParcelable("myBooleanArray", new SparseBooleanArrayParcelable(adapter.mCheckStates)); and mCheckStates = (SparseBooleanArray) bundle.getParcelable("myBooleanArray");, to store and retrieve the SparseBooleanArray on activity being destroyed and recreated. The onDestroy() method is of the parent class, which is an activity. I haven't pasted that, because I thought it was irrelevant. Please ask if it's needed.
I'm also using a SparseBooleanArrayParcelable class that helps me mCheckStates on destruction, and retrieve on creation.
According to the logs, the NullPointerException occurs within onDestroy() when trying to execute bundle.putParcelable("myBooleanArray", new SparseBooleanArrayParcelable(adapter.mCheckStates));
Help will be appreciated. Thank you!
EDIT: I had initialized bundle wrong. Now I do not get any sort of errors, but the checkbox state isn't saved. I could use some help with that. Thank you!

why android mycustom adapter not working

mycustom adapter which extends from baseadapter but when i run my main java file it shows main activity no
list view item
public class MyCustomadapter extends BaseAdapter{
private Context mycontext;
String[] mystringlist;
public MyCustomadapter(Context context,String[] strText) {
this.mycontext=context;
this.mystringlist = strText;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return mystringlist.length;
}
#Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
LayoutInflater inflater = (LayoutInflater) mycontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowView = inflater.inflate(R.layout.each_row, parent,false);
TextView tv = (TextView) rowView.findViewById(R.id.rowtxt);
tv.setText(mystringlist[position]);
return rowView;
}
}
mycustom adapter which extends from baseadapter but when i run my main java file it shows main activity no
list view item

problem:
return 0;
You are return 0 means there would be no list items to be displayed in your ListView thus giving you 0 result.
You need to return the number of item in your array or the length of it.
sample:
#Override
public int getCount() {
// TODO Auto-generated method stub
return mystringlist.length;
}

#Override
public int getCount()
{
// TODO Auto-generated method stub
return mystringlist.length();
}

My idea is extending ArrayAdapter, Have a look at the following codes
public class MyAdapter extends ArrayAdapter<String>{
public MyAdapter(Context context, String[] items) {
super(context, 0, items);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// your codes for generating rows
String thisItem = getItem(position);
}
}
You're done, also you're no longer need to override other methods!

Just as an addendum your getItem() method is incorrect. It should read as follows:
#Override
public Object getItem(int arg0) {
return mystringlist[position];
}

buttons doesn't work inside a ListView

I have a Button inside a ListView.
I want to go to another Activity when it is clicked.
But I get this error:
No enclosing instance of the type Appointment is accessible in scope
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.item_row, null);
TextView txtsection = (TextView)vi.findViewById(R.id.section);
TextView txtdoctor = (TextView)vi.findViewById(R.id.doctor);
TextView txtdate = (TextView)vi.findViewById(R.id.date);
TextView txttime = (TextView)vi.findViewById(R.id.time);
btchange = (Button)vi.findViewById(R.id.change);
btchange.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(context, Available.class);
startActivity(i);
}
});
btdelete = (Button)vi.findViewById(R.id.delete);
txtsection.setText(item.section);
txtdoctor.setText(item.doctor);
txtdate.setText(item.date);
txttime.setText(item.time);
return vi; }}

At line
Intent i = new Intent(Appointment.this,Available.class);
Appointment.this is valid only if the adaptar is an inner class of Appointment.
If is not the case, use the Context passed to the adapter.
Intent i = new Intent(context, Available.class);
Declare a private field, named context, in your adapter:
private Context context;
In the adapter constructor, assign the context passed to it:
this.context = context;
Change the getView method to this:
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if( convertView == null ){
convertView = inflater.inflate(R.layout.yourListLayout, parent, false);
}
Button btchange = (Button)convertView.findViewById(R.id.yourbuttonid);
btchange.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(context, Available.class);
startActivity(i);
}
});
return convertView;
}
EDIT
btChange also need to point to the button that has clicked as playmaker420 said.
I edited the code to accomplish that.
EDIT 2
Change your code adapter to this:
package com.example.clinic;
public class CustomListViewAdapter extends BaseAdapter
{
private Context context;
Button btchange,btdelete;
LayoutInflater inflater;
List<ListViewItem> items;
public CustomListViewAdapter(Activity context, List<ListViewItem> items) {
super();
this.context = context;
this.items = items;
this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return items.size();
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.item_row, null);
//add
ListViewItem item = items.get(position);
TextView txtsection = (TextView)vi.findViewById(R.id.section);
TextView txtdoctor = (TextView)vi.findViewById(R.id.doctor);
TextView txtdate = (TextView)vi.findViewById(R.id.date);
TextView txttime = (TextView)vi.findViewById(R.id.time);
btchange = (Button)vi.findViewById(R.id.change);
btchange.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(context, Available.class);
//updated
context.startActivity(i);
}
});
btdelete = (Button)vi.findViewById(R.id.delete);
txtsection.setText(item.section);
txtdoctor.setText(item.doctor);
txtdate.setText(item.date);
txttime.setText(item.time);
return vi;
}

Intent i = new Intent(Appointment.this,Available.class);
startActivity(i);

Listview click is not fire.

I created custom adapter for listview which contain text and images, on click of particular list item I have to open another activity, but I am not able to fire listview click event, below is my code.
Thanks.
Adapter
public class ImageAndTextAdapter extends ArrayAdapter<String> {
private LayoutInflater mInflater;
private Context myCtx;
private String[] mStrings;
private TypedArray mIcons;
private int mViewResourceId;
public ImageAndTextAdapter(Context ctx, int viewResourceId,
String[] strings, TypedArray icons) {
super(ctx, viewResourceId, strings);
myCtx = ctx;
mInflater = (LayoutInflater)ctx.getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
mStrings = strings;
mIcons = icons;
mViewResourceId = viewResourceId;
}
#Override
public int getCount() {
return mStrings.length;
}
#Override
public String getItem(int position) {
return mStrings[position];
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = mInflater.inflate(mViewResourceId, null);
ImageView iv = (ImageView)convertView.findViewById(R.id.option_icon);
iv.setImageDrawable(mIcons.getDrawable(position));
TextView tv = (TextView)convertView.findViewById(R.id.option_text);
tv.setText(mStrings[position]);
return convertView;
}
}
Main acitivity
public class OurWishingWellActivity extends ListActivity implements OnClickListener{
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.list_view_image);
Context ctx = getApplicationContext();
Resources res = ctx.getResources();
String[] options = res.getStringArray(R.array.reg_item_names);
TypedArray icons = res.obtainTypedArray(R.array.reg_icons);
setListAdapter(new ImageAndTextAdapter(ctx, R.layout.list_item,
options, icons));
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}

Respected Aafag#
You have write onclick of listview like below.
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
Toast.makeText(AdvancedListViewActivity.this, "working", Toast.LENGTH_SHORT).show();
System.out.println("working!!!!!!!!!");
}

Add listener
#Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = mInflater.inflate(mViewResourceId, null);
ImageView iv = (ImageView)convertView.findViewById(R.id.option_icon);
iv.setImageDrawable(mIcons.getDrawable(position));
TextView tv = (TextView)convertView.findViewById(R.id.option_text);
tv.setText(mStrings[position]);
convertView .setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity();
}
});
return convertView;
}