Develop Reference

check one box multiple boxes are checked

I am using custom listViewAdapter class and I want to check one box in a single row, but it is checking multiple checks in multiple rows which is not my requirement. Please tell me how can I resolve it.
CourseActivity.java
package com.technerdshub.vusocial.Activities;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.SaveCallback;
import com.technerdshub.vusocial.DBHelper;
import com.technerdshub.vusocial.Models.Course;
import com.technerdshub.vusocial.Models.StudyProgramModel;
import com.technerdshub.vusocial.Models.User;
import com.technerdshub.vusocial.R;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
public class CourseActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
ListView list;
EditText editsearch;
ArrayList arrayList = new ArrayList();
CourseViewAdapter adapter;
Course courseObject;
boolean isChecked;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.course_activity);
List<Course> courseList;
DBHelper db = new DBHelper(this);
courseList = db.getAllCourses();
list = (ListView) findViewById(R.id.listview1);
for (Course c : courseList) {
arrayList.add(c);
}
adapter = new CourseViewAdapter(this, arrayList);
adapter.courseActivity = this;
list.setAdapter(adapter);
editsearch = (EditText) findViewById(R.id.searchF);
editsearch.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String text = editsearch.getText().toString().toLowerCase(Locale.getDefault());
adapter.filter(text);
}
#Override
public void afterTextChanged(Editable s) {
}
});
User user = User.getInstance();
saveUserOnParse(user);
}
private void saveUserOnParse(User user) {
ParseObject parseUser = new ParseObject("UserData");
parseUser.put("name", user.getName());
parseUser.put("vuId", user.getVuId());
parseUser.put("studyProgram", user.getStudyProgram());
parseUser.put("facebookId", user.getFacebookId());
parseUser.put("facebookEmail", user.getFacebookEmail());
parseUser.saveInBackground(new SaveCallback() {
#Override
public void done(ParseException e) {
if (e == null) {
// Intent i = new Intent(getContext(), StudentDashboardActivity.class);
//// i.putExtra("E-mail", "abc");
// startActivity(i);
} else {
Toast temp = Toast.makeText(CourseActivity.this, "Data is not saved.", Toast.LENGTH_SHORT);
temp.show();
}
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// check if the request code is same as what is passed here it is 4
if (requestCode == 2) {
courseObject = (Course) data.getExtras().getSerializable("SelectedCourse");
}
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
CheckBox cb = (CheckBox) view.findViewById(R.id.checkBox);
//  TextView tv = (TextView) v.findViewById(R.id.textView1);
cb.performClick();
if (cb.isChecked()) {
// checkedValue.add(tv.getText().toString());
} else if (!cb.isChecked()) {
// checkedValue.remove(tv.getText().toString());
}
}
}
CourseViewAdapter.java
package com.technerdshub.vusocial.Activities;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.TextView;
import com.technerdshub.vusocial.Models.Course;
import com.technerdshub.vusocial.Models.StudyProgramModel;
import com.technerdshub.vusocial.R;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
/**
* Created by Saroosh on 7/16/2016.
*/
public class CourseViewAdapter extends BaseAdapter {
protected CourseActivity courseActivity;
Context mContext;
LayoutInflater inflater;
private List<Course>worldpopulationlist=null;
private ArrayList<Course> arraylist;
public CourseViewAdapter(Context context, List<Course>worldpopulationlist){
mContext = context;
this.worldpopulationlist = worldpopulationlist;
inflater = LayoutInflater.from(mContext);
this.arraylist = new ArrayList<Course>();
this.arraylist.addAll(worldpopulationlist);
}
public class ViewHolder {
TextView courseCode;
TextView courseName;
CheckBox checkBox;
}
#Override
public int getCount() {
return worldpopulationlist.size();
}
#Override
public Course getItem(int position) {
return worldpopulationlist.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
public View getView(final int position, View view, ViewGroup parent) {
final ViewHolder holder;
if (view == null) {
holder = new ViewHolder();
view = inflater.inflate(R.layout.c_list_item, null);
// Locate the TextViews in listview_item.xml
holder.courseName = (TextView) view.findViewById(R.id.course_name);
holder.courseCode = (TextView) view.findViewById(R.id.course_code);
holder.checkBox= (CheckBox) view.findViewById(R.id.checkBox);
// holder.duration = (TextView) view.findViewById(R.id.program_duration);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
// Set the results into TextViews
holder.courseName.setText(worldpopulationlist.get(position).getCourseName());
holder.courseCode.setText(worldpopulationlist.get(position).getCourseCode());
//holder.duration.setText(worldpopulationlist.get(position).getDuration());
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// Send single item click data to SingleItemView Class
Intent intent = new Intent(mContext, CourseActivity.class);
// Pass all data ran
intent.putExtra("SelectedCourse", worldpopulationlist.get(position));
// Pass all data country
courseActivity.setResult(2,intent);
courseActivity.finish();
}
});
return view;
}
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
worldpopulationlist.clear();
if (charText.length() == 0) {
worldpopulationlist.addAll(arraylist);
}
else
{
for (Course wp : arraylist)
{
if (wp.getCourseName().toLowerCase(Locale.getDefault()).contains(charText))
{
worldpopulationlist.add(wp);
}
}
}
notifyDataSetChanged();
}
}

Write all your checkbox logic inside you adapter getView method. That will work .

Accessing an element-Button in grid view

I am supposed to access a button of an element in a grid view and supposed to capture the onItemClick() activity of that button, but somehow I am not able to do it. Help me out. I am posting my code below. Please check it.
package com.nik.cardone;
import java.util.ArrayList;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.GridView;
import android.widget.TextView;
public class Fragment2 extends Fragment{
GridView fragment2Grid;
POJOMenuGrid pojo;
ArrayList<POJOMenuGrid> arr;
String[] name = {"Manchow Soup","Clear Soup","Mushroom Soup","Corn Soup","Tomato Soup"};
String[] desc = {"Soya water with capsicum , carrots , medium spicy"};
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View v = inflater.inflate(R.layout.new_order_fragment_2, null);
initialize();
fragment2Grid = (GridView)v.findViewById(R.id.fragment2Grid);
fragment2Grid.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
View v = arg0.getChildAt(arg2);
// TODO Auto-generated method stub
System.out.println("In grid :");
}
});
for(int i=0;i<5;i++){
arr.add(new POJOMenuGrid(name[i], desc[0], R.drawable.t2));
}
System.out.println(arr.get(0).getName()+" "+arr.get(0).getDescription()+" ");
CustomGridAdapter adapter = new CustomGridAdapter(v.getContext(), arr);
fragment2Grid.setAdapter(adapter);
System.out.println("adapter set");
return v;
}
private void initialize() {
// TODO Auto-generated method stub
arr = new ArrayList<POJOMenuGrid>();
}
}
Custom Adapter
package com.nik.cardone;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class CustomGridAdapter extends BaseAdapter{
Context context;
ArrayList<POJOMenuGrid> arr;
LayoutInflater inflater;
TextView itemName;
TextView itemDescription;
ImageView itemImage;
Button plus;
Button minus;
TextView counter;
public CustomGridAdapter(Context context, ArrayList<POJOMenuGrid> arr) {
super();
this.context = context;
this.arr = arr;
inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
System.out.println("in constructor");
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return arr.size();
}
#Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return arr.get(arg0);
}
#Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
#Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
System.out.println("in adapter 1");
arg1 = inflater.inflate(R.layout.grid_single_item, null);
System.out.println("in adapter 2");
itemName = (TextView)arg1.findViewById(R.id.itemName);
itemDescription = (TextView)arg1.findViewById(R.id.itemDescription);
//counter = (TextView)arg1.findViewById(R.id.counter);
itemImage = (ImageView)arg1.findViewById(R.id.itemImage);
plus = (Button)arg1.findViewById(R.id.plus);
minus = (Button)arg1.findViewById(R.id.minus);
plus.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
System.out.println("In plus :");
// TODO Auto-generated method stub
TextView counter = (TextView)arg0.findViewById(R.id.counter);
int counter1 = Integer.parseInt(counter.getText().toString());
counter1++;
counter.setText(""+counter1);
}
});
minus.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
TextView counter = (TextView)arg0.findViewById(R.id.counter);
int counter1 = Integer.parseInt(counter.getText().toString());
counter1--;
counter.setText(""+counter1);
}
});
System.out.println("in adapter 3");
itemName.setText(arr.get(arg0).getName());
itemDescription.setText(arr.get(arg0).getDescription());
itemImage.setImageResource(arr.get(arg0).getImage());
System.out.println("in adapter 4");
return arg1;
}
}

Android onClick event on RadioButton not working

I want to make a list of restaurants and have radiobutton besides each name. so i have made two xml files. In the first one there is a listview and another there is a single radioButton.
Now i want to set the onClick listener on each radioButton.Please suggest me about how to do it. I am posting my code below.
MainActivity.java
package com.example.radiogroup;
import java.util.ArrayList;
import java.util.HashMap;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.app.Activity;
import android.content.Context;
import android.database.DataSetObserver;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
import android.os.Build;
public class MainActivity extends Activity {
private ArrayList<HashMap<String,Object>> data;
private ListAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView lv=(ListView)findViewById(R.id.listView1);
data=new ArrayList<HashMap<String, Object>>();
prepareListData();
adapter = new ListAdapter(this,data);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id)
{
RadioButton rb=(RadioButton)findViewById(R.id.radioButton1);
{
if(position==0)
{
Toast.makeText(getApplicationContext(), "Move forward",
Toast.LENGTH_SHORT).show();
}
}
}
});
}
private void prepareListData()
{
HashMap<String,Object> row1=new HashMap<String,Object>();
row1.put("ID",1 );
row1.put("NAME","Taj Mahal");
data.add(row1);
HashMap<String,Object> row2=new HashMap<String,Object>();
row2.put("ID",2 );
row2.put("NAME","Agra Fort");
data.add(row2);
HashMap<String,Object> row3=new HashMap<String,Object>();
row3.put("ID",3 );
row3.put("NAME","Ram Baugh");
data.add(row3);
HashMap<String,Object> row4=new HashMap<String,Object>();
row4.put("ID",4 );
row4.put("NAME","Panch Mahal");
data.add(row4);
HashMap<String,Object> row5=new HashMap<String,Object>();
row5.put("ID",5 );
row5.put("NAME","Musamman Burj");
data.add(row5);
}
class ListAdapter extends BaseAdapter
{
private Context context;
private ArrayList<HashMap<String,Object>> list;
public ListAdapter(Context context,ArrayList<HashMap<String,Object>> list){
this.context = context;
this.list = list;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder;
if(convertView == null){
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.row,null,false);
holder.rb = (RadioButton) convertView.findViewById(R.id.radioButton1);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.rb.setText(list.get(position).get("NAME").toString());
return convertView;
}
class ViewHolder
{
RadioButton rb;
}
}
}

Use it in ListAdapter-
holder.rb.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "" + position,
Toast.LENGTH_LONG).show();
}
});

Create Custom BaseAdapter in Android 2.3.3

I want To Create my custom baseadapter So I try the following :
MainActivity.java
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Spinner;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import java.util.ArrayList;
public class SignupActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
String [] arr = {"USA","Canda","Germany","Italy"};
Spinner S1 = (Spinner) findViewById(R.id.Spinner_Signup);
CustomCountryAdpater adapter = new CustomCountryAdpater(this, arr);
S1.setAdapter(adapter);
}
}
CustomCountryAdpater.java
import android.view.View;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.content.Context;
import java.util.ArrayList;
import android.widget.TextView;
public class CustomCountryAdpater extends BaseAdapter {
public Context con;
//public ArrayList<Country> tempList;
String [] arr;
public LayoutInflater myInflater;
public CustomCountryAdpater (Context C,String [] arr)
{
this.con = C;
this.arr = arr;
this.myInflater = (LayoutInflater) C.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return this.arr.length;
}
#Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return this.arr[arg0];
}
#Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
#Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
if (arg1==null)
{
arg1 = myInflater.inflate(android.R.layout.simple_list_item_1, arg2, false);
TextView TT = (TextView) arg1.findViewById(android.R.id.text1);
TT.setText(this.arr[arg0]);
}
return arg1;
}
}
when I click on the spinner for first time I got the correct list :
but if I choose Germany, For example and click on the spinner again I get the following list that have no Germany !!!
can anyone told me Why ?!!!

Because you conditionally update text. arg1 you use might be an old, cached View.
Move these lines after if:
TextView TT = (TextView) arg1.findViewById(android.R.id.text1);
TT.setText(this.arr[arg0]);

Show all installed app in a grid view [duplicate]

This question already has answers here:
Duplicates When Showing Installed Applications in Android
(2 answers)
Closed 7 months ago.
Hello guys can you help me show all installed apps on the main screen? Can you give me some source code of a simple grid view?

Look at this code.
package com.example.android.apis.view;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import java.util.List;
import com.example.android.apis.R;
public class Grid1 extends Activity {
GridView mGrid;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
loadApps(); // do this in onresume?
setContentView(R.layout.grid_1);
mGrid = (GridView) findViewById(R.id.myGrid);
mGrid.setAdapter(new AppsAdapter());
}
private List<ResolveInfo> mApps;
private void loadApps() {
Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
mApps = getPackageManager().queryIntentActivities(mainIntent, 0);
}
public class AppsAdapter extends BaseAdapter {
public AppsAdapter() {
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i;
if (convertView == null) {
i = new ImageView(Grid1.this);
i.setScaleType(ImageView.ScaleType.FIT_CENTER);
i.setLayoutParams(new GridView.LayoutParams(50, 50));
} else {
i = (ImageView) convertView;
}
ResolveInfo info = mApps.get(position);
i.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));
return i;
}
public final int getCount() {
return mApps.size();
}
public final Object getItem(int position) {
return mApps.get(position);
}
public final long getItemId(int position) {
return position;
}
}
}
Source API demo..