Develop Reference

How to update Custom ListView by button click

I am try to show Custom List View using Custom Adapter. that is showing data nicely but when i try to add new Item form EditTxt on click of Button then getting error.
Could not execute method for android:onClick
i am not able to add new Item in this list. here name will come form EditText and other item will constant. i try many method but not getting my solution. Another issue is , Activity is opening little late. can you tell me issue behind this.. please check Code...
Activity_phone_book.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<EditText
android:layout_width="280dp"
android:layout_height="40dp"
android:layout_gravity="left"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:gravity="center|center_horizontal|center_vertical"
android:text="Type Your Name"
android:textSize="14sp"
android:id="#+id/addNewName"/>
<Button
android:layout_width="100dp"
android:id="#+id/addNew"
android:onClick="addNewData"
android:layout_height="40dp"
android:layout_marginLeft="10dp"
android:text="Add New" />
</LinearLayout>
<ListView
android:id="#+id/listView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
activity_array.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="#+id/userImage"
android:layout_width="109dp"
android:layout_height="90dp"
android:padding="5dp" />
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/userName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView"
android:textAppearance="?android:attr/textAppearanceMedium"
android:layout_marginLeft="10dp"/>
<TextView
android:id="#+id/profile"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
android:padding="2dp"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#4d4d4d"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
PhoneBook Activity
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
public class PhoneBook extends AppCompatActivity {
// Declare variable types
int[] images={R.drawable.pankaj,R.drawable.logo_red,R.drawable.about_us,R.drawable.buddy_1,
R.drawable.buddy_2,R.drawable.contact_us,R.drawable.head_659651_640,R.drawable.login1,
R.drawable.login2,R.drawable.login3};
String[] names={"Pankaj Kumar","Rahul","Prabhash","Rima","Kum","Rupali","Amrawati","Nabhya",
"Nidhi","Sonu"};
String[] profiles={ "Web Developer","Software Developer","Web Developer","Software Developer",
"Web Developer","Software Developer","Web Developer","Software Developer",
"Web Developer","Software Developer" };
Button addNew ;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_phone_book);
ListView listview = (ListView) findViewById(R.id.listView);
CustomAdapter customAdapter = new CustomAdapter();
listview.setAdapter(customAdapter);
}
// here i want to add new Item using this function
public void addNewData( View v)
{
Toast.makeText(this, "length " + images.length, Toast.LENGTH_SHORT).show();
# here i am try to add new item in Array. but getting error. many method applied here but now worked.please tell me how can i add new item form Edit Text...
images = new int[R.drawable.login3];
}
class CustomAdapter extends BaseAdapter{
#Override
public int getCount() {
return images.length;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#SuppressLint("ViewHolder")
#Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = getLayoutInflater().inflate(R.layout.activity_array ,null);
ImageView imageView = (ImageView)convertView.findViewById(R.id.userImage);
TextView textView = (TextView)convertView.findViewById(R.id.userName);
TextView textView1 = (TextView)convertView.findViewById(R.id.profile);
imageView.setImageResource(images[position]);
textView.setText(names[position]);
textView1.setText(profiles[position]);
return convertView;
}
}
class CustomAdapter1 extends BaseAdapter
{
#Override
public int getCount() {
return images.length;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#SuppressLint("ViewHolder")
#Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = getLayoutInflater().inflate(R.layout.activity_array ,null);
ImageView imageView = (ImageView)convertView.findViewById(R.id.userImage);
TextView textView = (TextView)convertView.findViewById(R.id.userName);
TextView textView1 = (TextView)convertView.findViewById(R.id.profile);
imageView.setImageResource(images[position]);
textView.setText(names[position]);
textView1.setText(profiles[position]);
return convertView;
}
}
}

getView() is not called in custom list adapter?

This is my homepage.xml - where list view is placed:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/background"
android:orientation="vertical"
tools:context="com.andapps.azaz.e_recommender.HomePage">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Select Category:"
android:textStyle="bold|italic"
android:layout_marginLeft="15sp"
android:layout_marginRight="14sp"
android:textColor="#color/textColor"
/>
<Spinner
android:id="#+id/spcategorieshomepage"
android:layout_width="match_parent"
android:layout_height="35sp"
android:layout_marginRight="14sp"
android:spinnerMode="dropdown"
android:textColor="#color/textColor"
>
</Spinner>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="#+id/llhome"
android:gravity="center"
android:layout_marginLeft="15sp"
android:layout_marginRight="14sp">
<ListView
android:id="#+id/listView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
</LinearLayout>
</LinearLayout>
And also my customlist.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Product ID:"
android:textStyle="bold|italic"
android:layout_marginLeft="15sp"
android:layout_marginRight="14sp"
android:textColor="#color/textColor"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold|italic"
android:layout_marginLeft="15sp"
android:layout_marginRight="14sp"
android:textColor="#color/textColor"
android:id="#+id/tvproductid"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Product Name:"
android:textStyle="bold|italic"
android:layout_marginLeft="15sp"
android:layout_marginRight="14sp"
android:textColor="#color/textColor"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold|italic"
android:layout_marginLeft="15sp"
android:layout_marginRight="14sp"
android:textColor="#color/textColor"
android:id="#+id/tvproductname"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Product Rating:"
android:textStyle="bold|italic"
android:layout_marginLeft="15sp"
android:layout_marginRight="14sp"
android:textColor="#color/textColor"
/>
<RatingBar
android:id="#+id/ratingBar"
style="?android:attr/ratingBarStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15sp"
android:layout_marginRight="14sp"
android:max="5"
android:numStars="5" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold|italic"
android:layout_marginLeft="15sp"
android:layout_marginRight="14sp"
android:textColor="#color/textColor"
android:id="#+id/tvproductdesc"
/>
<ImageView
android:layout_width="300dp"
android:layout_height="300dp"
android:id="#+id/imageView"
android:layout_marginLeft="15sp"
android:layout_marginRight="14sp"
/>
</LinearLayout>
My homepage.java contains code which is using AsyncTask to consume REST API and fill arrays of data and send it to customAdapter.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_page);
lv=(ListView) findViewById(R.id.listView);
Bundle emailbundle=getIntent().getExtras();
email=emailbundle.get("email").toString();
initializer();
addingItemstoSpinner();
}
protected void onPostExecute(String result) {
try {
jsonArray = new JSONArray(result);
} catch (JSONException e) {
e.printStackTrace();
}
len= jsonArray.length();
pdLoading.dismiss();
if (len != 0) {
try {
String [] productIDListArr= new String[len];
String [] productNameListArr= new String[len];
String [] productDescListArr= new String[len];
String [] productImagesArr= new String[len];
String [] productStarsArr= new String[len];
for (int i=0;i<len;i++)
{
objectInArray = jsonArray.getJSONObject(i);
productIDListArr[i]=(objectInArray.getString("productId"));
productNameListArr[i]=(objectInArray.getString("productName"));
productDescListArr[i]=(objectInArray.getString("stars"));
productImagesArr[i]=(objectInArray.getString("productId"));
productStarsArr[i]=(objectInArray.getString("stars")+" out of 5");
if(i==len-1)
{
createdAt=objectInArray.getString("createdAt");
}
}
lv.setAdapter(new CustomAdapter(HomePage.this, productIDListArr,productNameListArr,productDescListArr,productImagesArr,productStarsArr,email));
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Toast.makeText(getApplicationContext(), "Server is down please try again later", Toast.LENGTH_LONG).show();
}
My customAdapter.java is
package com.andapps.azaz.e_recommender;
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.ImageView;
import android.widget.RatingBar;
import android.widget.TextView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
/**
* Created by M.Azaz on 30-Mar-17.
*/
public class CustomAdapter extends BaseAdapter {
String [] productIDListArr,productNameListArr,productDescListArr,productImagesArr,productStarsArr;
Context context;
String email;
private static LayoutInflater inflater=null;
public CustomAdapter(HomePage homePage, String[] productIDList, String[] productNameList, String[] productDescList, String[] productImages, String[] productStars,String emailMain) {
// TODO Auto-generated constructor stub
productIDListArr=productIDList;
productNameListArr=productNameList;
productDescListArr=productDescList;
productImagesArr=productImages;
productStarsArr=productStars;
context=homePage;
email=emailMain;
inflater = ( LayoutInflater )context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return productIDListArr.length;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return productIDListArr[position];
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public class Holder
{
TextView tvproductname, tvproductid, tvproductdesc;
ImageView imageView;
RatingBar ratingBar;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder holder=new Holder();
View rowView;
rowView = inflater.inflate(R.layout.activity_custom_list, null);
holder.tvproductname=(TextView) rowView.findViewById(R.id.tvproductname);
holder.tvproductid=(TextView) rowView.findViewById(R.id.tvproductid);
holder.tvproductdesc=(TextView) rowView.findViewById(R.id.tvproductdesc);
holder.imageView=(ImageView) rowView.findViewById(R.id.imageView);
holder.ratingBar=(RatingBar) rowView.findViewById(R.id.ratingBar);
holder.tvproductname.setText(productNameListArr[position]);
holder.tvproductid.setText(productIDListArr[position]);
holder.tvproductdesc.setText(productDescListArr[position]);
holder.ratingBar.setRating(Integer.parseInt(productStarsArr[position]));
Picasso.with(context).load(context.getString(R.string.imageip) + productImagesArr[position]+".jpg").into(holder.imageView);
rowView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(context, "You Clicked "+productIDListArr[position], Toast.LENGTH_LONG).show();
Intent intent = new Intent("com.andapps.azaz.e_recommender.RATINGS");
intent.putExtra("tag",productIDListArr[position]);
intent.putExtra("email", email);
context.startActivity(intent);
}
});
return rowView;
}
}
But when I run the code, it actually calls customAdapter.java but right after calling getCount() from customAdapter Its not calling getView and the application terminates.
One more thing... how can I update more items into existing list?

You app may crash in getCount method when productIDListArr is null. So add if condition in your getCount method before returning count.
For example :
public int getCount(){
if(productIDListArr==null){
return 0;
}else{
return productIDListArr.length;
}
}
Tips : Create a class for holding your response data and pass the list of that model class to the adapter and each time when there is any change in your data update that list and call notify method of adapter.
For example :
Class Item{
public String productIDListArr;
public String productNameListArr;
public String productDescListArr;
public String productImagesArr;
public String productStarsArr;
}
ArrayList<Item> items=new ArrayList<Item>();
for (int i=0;i<len;i++)
{
objectInArray = jsonArray.getJSONObject(i);
Item item=new Item();
item.productIDListArr=(objectInArray.getString("productId"));
.......
}
CustomAdapter extend BaseAdapter{
ArrayList<Item> items;
public CustomAdapter(ArrayList<Item> items){
this.items=items;
}
public int getCount(){
return items==null?0:items.size()
}

How to create custom adapter for custom listview with Hashmap

How i can create a custom adapter for this xml.Can someone guide me on how to create a custom adapter or give me a sample code on how to do it. Please help me i need to learn how to create custom adapter.Help me please. Thanks in advance.
This is my MainActivity.java
package com.example.work.listviewadapter;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class MainActivity extends ActionBarActivity {
private static final String PRODUCTLIST_URL ="http://192.168.56.1/productlist.php";
private ProgressDialog pDialog;
public static final JSONParser jParser = new JSONParser();
private static final String GET_PRODUCT = "message";
private static final String GET_ID = "ID";
private static final String GET_BRAND = "Brand";
private static final String GET_CATEGORY = "Category";
private static final String GET_DESCRIPTION = "Description";
private static final String GET_CODE = "Code";
private static final String GET_QUANTITY = "Quantity";
private static final String GET_UNIT = "Unit";
private static final String GET_UNITPRICE = "Unitprice";
private JSONArray order = null;
ListView list;
private ArrayList<HashMap<String, String>> orderlist;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.productlist);
new LoadComments().execute();
}
public void updateJSONdata() {
orderlist = new ArrayList<HashMap<String, String>>();
JSONObject json = jParser.getJSONFromUrl(PRODUCTLIST_URL);
try {
order = json.getJSONArray(GET_PRODUCT);
for (int i = 0; i < order.length(); i++) {
JSONObject c = order.getJSONObject(i);
String id = c.getString(GET_ID);
String brand = c.getString(GET_BRAND);
String category = c.getString(GET_CATEGORY);
String description = c.getString(GET_DESCRIPTION);
String code = c.getString(GET_CODE);
String quantity = c.getString(GET_QUANTITY);
String unit = c.getString(GET_UNIT);
String unitprice = c.getString(GET_UNITPRICE);
HashMap<String, String> map = new HashMap<String, String>();
map.put(GET_ID,id);
map.put(GET_BRAND, brand);
map.put(GET_CATEGORY, category);
map.put(GET_DESCRIPTION, description);
map.put(GET_CODE, code);
map.put(GET_QUANTITY, quantity);
map.put(GET_UNIT, unit);
map.put(GET_UNITPRICE, unitprice);
orderlist.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
private void updateList() {
//this is for my custom listview
}
final public class LoadComments extends AsyncTask<Void, Void, Boolean> {
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Loading Order...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected Boolean doInBackground(Void... arg0) {
//we will develop this method in version 2
updateJSONdata();
return null;
}
#Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
pDialog.dismiss();
//we will develop this method in version 2
updateList();
}
}
}
This is my Custom ListView.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dip"
android:background="#drawable/list_selector"
>
<TextView
android:id="#+id/Quantity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="10000"
android:textSize="24dip"
android:textStyle="bold"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginTop="24dp"
android:layout_marginRight="51dp"
>
</TextView>
<TextView
android:id="#+id/Unit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Gal."
android:layout_alignParentRight="true"
android:layout_marginTop="26dp"
android:textSize="20dp"
android:layout_marginRight="15dp"
/>
<TextView
android:id="#+id/Description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="White"
android:textColor="#040404"
android:typeface="sans"
android:textSize="20dip"
android:textStyle="bold"/>
<TextView
android:id="#+id/Code"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Wpu-01"
android:layout_marginTop="2dp"
android:layout_below="#+id/Description"
android:layout_marginLeft="10dp"/>
<TextView
android:id="#+id/Brand"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/Code"
android:layout_marginLeft="10dp"
android:layout_marginTop="2dp"
android:text="Weber"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Urethane"
android:layout_below="#+id/Code"
android:layout_marginTop="2dp"
android:layout_toRightOf="#+id/Brand"
android:layout_marginLeft="5dp"
android:id="#+id/Category" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/Category"
android:text="P"
android:layout_marginLeft="12dp"
android:paddingRight="5dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:textStyle="italic"
android:id="#+id/P"
/>
<TextView
android:id="#+id/Price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="10000.00"
android:layout_below="#+id/Brand"
android:layout_toRightOf="#+id/P"
android:layout_marginTop="2dp"
android:layout_marginLeft="2dp"
/>
<TextView
android:id="#+id/ID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="11"
android:layout_alignParentRight="true"
android:visibility="invisible"
/>
</RelativeLayout>
This for the listview
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<EditText
android:id="#+id/search"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Search"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:singleLine="true"/>
<ListView
android:layout_below="#+id/search"
android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#fff"
android:divider="#ff5873ff"
android:dividerHeight="3dp" />

You can design your BaseAdapter like below code, also you can optimize listview performance using ViewHolder pattern
private class MyAdapter extends BaseAdapter{
private LayoutInflater mlayoutInflater;
public MyAdapter(Context context) {
mlayoutInflater = LayoutInflater.from(context); //Dynamic layout mapping
}
#Override
public int getCount() {
return orderlist.size();
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = mlayoutInflater.inflate(R.layout.listitem, null); // According to the layout of the document to instantiate view
TextView tv = (TextView)convertView.findViewById(R.id.textView);
tv.setText(orderlist.get(position).get(GET_BRAND).toString());
return convertView;
}
}

I'll use a custom adapter I've made as an example. It may solve your problem if you follow the steps and shape it to your needs.
When you want to make a custom ListView, you have to write your own adapter. In this particular case I'm subclassing the BaseAdapter class.
This custom adapter will take hold of my data model, and will inflate the data to my ListView rows.
First, I'll create the XML of my custom row. You can see the code below.
item_mail.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Test text"
android:id="#+id/tv_mail"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/iv_icon"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:src="#android:drawable/ic_menu_report_image" />
</RelativeLayout>
Here I've created a row that displays a text and an image.
Now, I'll create my custom adapter to handle this XML. As you can see below.
MailAdapter.java
public class MailAdapter extends BaseAdapter {
private static final String LOG_TAG = MailAdapter.class.getSimpleName();
private Context context_;
private ArrayList<ArrayList<String>> mailitems;
public MailAdapter(Context context, ArrayList<ArrayList<String>> mailitems) {
this.context_ = context;
this.mailitems = mailitems;
}
#Override
public int getCount() {
return mailitems.size();
}
#Override
public Object getItem(int position) {
return mailitems.get(position).get(0);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater)
context_.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.item_mail, null);
}
TextView tv_mail = (TextView) convertView.findViewById(R.id.tv_mail);
ImageView iv_icon = (ImageView) convertView.findViewById(R.id.iv_icon);
String mail = mailitems.get(position).get(0);
String icon = mailitems.get(position).get(1);
Log.d(LOG_TAG,"Mail: " + mail + " mail_icon: " + icon);
tv_mail.setText(mail);
// iv_icon.setImageURI(); Here you can do whatever logic you want to update your image, using URI's, ID's, or something else.
return convertView;
}
}
Ok. Now we have everything to make this work. In your Activity class, do something like that:
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity">
<TextView
android:text="#string/hello_world"
android:id="#+id/tv_header"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/tv_header">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add mail"
android:id="#+id/button"
android:layout_gravity="center" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/listView" />
</LinearLayout>
</RelativeLayout>
MainActivity.java
public class MainActivity extends ActionBarActivity {
private int numMail = 1; // Dummy int to create my items with different numbers.
private MailAdapter mailAdapter; // Your custom adapter.
private ArrayList<ArrayList<String>> mailItems; // This is going to be your data structure, everytime you change it, call the notifyDataSetChanged() method.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bt = (Button) findViewById(R.id.button);
ListView lv_mail = (ListView) findViewById(R.id.listView);
mailItems = new ArrayList<>();
mailAdapter = new MailAdapter(this,mailItems);
lv_mail.setAdapter(mailAdapter);
bt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addItem(); // The method I'm using to insert the item. Look for it below.
}
});
}
// Here I'm creating a new ArrayList, and appending it to my 'mailItems' Array. After that, I'm notifying the adapter that my data changed.
private void addItem() {
ArrayList<String> mail = new ArrayList<>();
mail.add(0,"mail " + numMail++);
mail.add(1,"path_to_image"); // Depending on what you want to do, put your path, URI, or whatever other way you want to store that image data.
mailItems.add(mail); // Inserting the data on the ArrayList.
mailAdapter.notifyDataSetChanged(); // Notifying the adapter that my ArrayList was modified.
}
}
This should do the trick.
You can read a little more about that here and I've found a similar question here, which you can read as well.
Edit: Another related question, which might be an interesting read.

Gridview Listener is not working

In my application, I have grid view and I wrote a listener to get position of clicked item in the grid view. I tried many ways to solve it but it is noting working.I'm looking solutions or help I have checked everything but i'm not able to clear it.I don't know where I have done mistake. anyone help me out with is.
rowitems xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="30dp"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:background="#drawable/customborder"
android:gravity="center_vertical"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" >
<ImageView
android:id="#+id/product_img"
android:layout_width="350dp"
android:layout_height="150dp"
android:layout_alignParentLeft="true"
android:src="#drawable/ic_launcher"
android:focusable="false"
android:focusableInTouchMode="false"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_weight="0.5"
android:background="#D7D7D7" >
<TextView
android:id="#+id/product_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="37dp"
android:text="#string/pname"
android:textAppearance="?android:attr/textAppearanceMedium"
android:focusable="false"
android:focusableInTouchMode="false"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="75dp" >
<Button
android:id="#+id/product_decribe_cart"
style="?android:attr/buttonStyleSmall"
android:layout_width="75dp"
android:layout_height="30dp"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="46dp"
android:background="#D41A37"
android:text="#string/cart"
android:textColor="#android:color/white"
android:textSize="8dp"
android:focusable="false"
android:focusableInTouchMode="false"/>
<TextView
android:id="#+id/product_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="40dp"
android:text="#string/rate"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#D41A37"
android:focusable="false"
android:focusableInTouchMode="false"/>
</RelativeLayout>
</LinearLayout>
<RelativeLayout
android:layout_width="262dp"
android:layout_height="113dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:layout_marginTop="10dp"
android:background="#drawable/customborder" >
<TextView
android:id="#+id/product_detail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="16dp"
android:text="Product details"
android:textAppearance="?android:attr/textAppearanceMedium"
android:focusable="false"
android:focusableInTouchMode="false"/>
</RelativeLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.GridView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class ProductActivity extends Activity
{
JSONArray results;
JSONObject jobj;
CustomProdAdapter adapter1;
ArrayList<String> a1,a2,a3,a4;
ArrayList<String> pname=new ArrayList<String>();
ArrayList<String> productdescription=new ArrayList<String>();
ArrayList<String> pimage=new ArrayList<String>();
ArrayList<String> pprice=new ArrayList<String>();
Button add;
String pid;
GridView gView;
#Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.product_activity);
a1=new ArrayList<String>();
a2=new ArrayList<String>();
a3=new ArrayList<String>();
a4=new ArrayList<String>();
Intent in=getIntent();
pid=in.getStringExtra("Dialoog");
System.out.println("productid"+pid);
gView = (GridView)findViewById(R.id.pa_grid);
/* gView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
System.out.println("inside listener");
}
});*/
new Producttask().execute();
}
private class Producttask extends AsyncTask<String, String, JSONObject>
{
private ProgressDialog pDialog;
#Override
protected void onPreExecute()
{
super.onPreExecute();
pDialog = new ProgressDialog(ProductActivity.this);
pDialog.setMessage("Loading Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args)
{
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl("my link");
return json;
}
#Override
protected void onPostExecute(JSONObject json)
{
System.out.println("---------------return product list json------------"+json);
pDialog.dismiss();
try
{
jobj=json.getJSONObject("response");
// Getting Array of Contacts
results = jobj.getJSONArray("obejects");
System.out.println("In product Activity after JSON");
// looping through All Contacts
for(int i = 0; i < results.length(); i++)
{
JSONObject c = results.getJSONObject(i);
pname.add(c.getString("product_name"));
pimage.add(c.getString("product_image"));
pprice.add(c.getString("product_price"));
productdescription.add(c.getString("Description"));
}
}
catch (JSONException e)
{
e.printStackTrace();
}
adapter1 = new CustomProdAdapter(getApplicationContext(), R.layout.product_describe, pname, pimage,productdescription,pprice);
gView.setAdapter(adapter1);
gView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
// TODO Auto-generated method stub
System.out.println("outside on click"+position);
}
});
/*gv=(GridView)findViewById(R.id.product_decribe_cart);
gv.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent i = new Intent(ProductActivity.this,product_details.class);
startActivity(i);
}
});
*/ }
}
}

Grid view listner set in oncreate method
new Producttask().execute();
gView = (GridView)findViewById(R.id.pa_grid);
gView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
// TODO Auto-generated method stub
System.out.println("outside on click"+position);
}
});
Or set you click listener on row , like that
public View getView(int position, View convertView, ViewGroup parent)
{
// TODO Auto-generated method stub
View row=convertView;
ViewHolder vh;
if(row==null)
{
row=inflater.inflate(R.layout.custom_product_activity, parent, false);
vh=new ViewHolder();
vh.pname=(TextView)row.findViewById(R.id.product_name);
vh.image1=(ImageView) row.findViewById(R.id.imageView1);
row.setTag(vh);
}
else
{
vh = (ViewHolder) row.getTag();
row=convertView;
}
vh.pname.setText(c_pname.get(position));
iloader.DisplayImage(c_pimage.get(position), vh.image1);
row.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
System.out.println("outside on click"+"position");
}
});
return row;
}

Color of listview item is very faint

Sorry if i am repeating the question.
I am reading SMS/s from inbox and showing them in the listview.
I can see the SMS/s in the listview as listview item after execution.
Only problem is that, the text color of listview item is vary pale.(text i am getting is not readable/visible).
I tried to change it, but nothing happened.
How i can change this color to black or to any other color ?
Here is my activity_view_task.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/tv_tasks"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="Tasks"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ListView
android:id="#+id/lv_view_task"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/tv_tasks"
android:layout_centerHorizontal="true"
android:cacheColorHint="#000000"
android:textColor="#000000">
</ListView>
</RelativeLayout>
Here is my java file from where I am adding the items to the listview :
package com.example.myapp;
import java.util.ArrayList;
import java.util.List;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.database.Cursor;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class ViewTask extends Activity {
TextView tv_view_task;
ListView lv_view_task;
static String sms = "";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_task);
tv_view_task=(TextView) findViewById(R.id.tv_view_task);
lv_view_task=(ListView) findViewById(R.id.lv_view_task);
List<String> msgList = getSms();
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(),android.R.layout.select_dialog_singlechoice, msgList);
lv_view_task.setAdapter(adapter);
}
public List<String> getSms() {
List<String> labeles = new ArrayList<String>();
Uri uri = Uri.parse("content://sms/inbox");
Cursor c = getContentResolver().query(uri, null, null, null, null);
// Read the sms data and store it in the list
if (c.moveToFirst()) {
do {
String body = c.getString(c.getColumnIndex("body"));
String address = c.getString(c.getColumnIndex("address"));
sms = "From : " + address + " : " + body;
labeles.add(sms);
} while (c.moveToNext());
}
c.close();
return labeles;
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_view_task, menu);
return true;
}
}
After executing it looks like this :

You will need to create a custom layout for your ListView items where you set your desired textcolor.
In this way, you do not even need a custom-adapter.
e.g. custom_textview.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:gravity="center"
android:layout_height="wrap_content"
>
<TextView
android:id="#+id/tv"
android:textColor="#color/white"
android:layout_width="fill_parent"
android:gravity="center"
android:layout_height="fill_parent"/>
</LinearLayout>
Then, you can use your layout with the ArrayAdapter:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, R.layout.custom_textview, aa);
lv.setAdapter(adapter);

Make Custom layout name row_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:ignore="HardcodedText,UselessParent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:orientation="horizontal" >
<TextView
android:id="#+id/tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center|left"
android:layout_marginLeft="10dp"
android:text="Medium Text"
android:textColor="#000000"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>
Make Custom Adapter globally like:
MyAdapter adp;
now initialize it on onCreate() method:
adp = new MyAdapter (YourActivity.this, yourArrayList);
class MyAdapter extends BaseAdapter {
Context c;
String[] yourarraylist;
LayoutInflater mInflater;
public CustomAdapter(Context fullImage, String[] yourarraylist) {
// TODO Auto-generated constructor stub
this.c = fullImage;
this.yourarraylist= yourarraylist;
mInflater = LayoutInflater.from(c);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return yourarraylist.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;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if (convertView == null) {
convertView = mInflater.inflate(R.layout.row_item, parent,
false);
TextView tv = (TextView) convertView.findViewById(R.id.tv);
// set text here
}
return convertView;
}
}

Add this to your activity_view_task.xml:
android:textColor="#000000"