Develop Reference

Howto Add Integers to a Listview With Custom Adapter

i have one list view with two text views inside it, one edit text that is in the same activity but not in the list view and two buttons one to add to the list view and the other to delete from it.
how to add integers to the first text view, the sum of all integers to the second one, and to be from a custom adapter.
thank you.
Activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical">
<EditText
android:id="#+id/edit_ten"
android:hint="Score"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/btn_add"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Add"/>
<Button
android:id="#+id/btn_delete"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Undo"/>
</LinearLayout>
<ListView
android:id="#+id/list_sinhvien"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</LinearLayout>
item_layout.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">
<LinearLayout
android:orientation="vertical"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/text_ten"
android:textSize="20dp"
android:text="Score"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/text_sdt"
android:textSize="20dp"
android:text="Total"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
MainActivity.java
package com.example.addanddelete;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
ListView listSinhvien;
EditText editTen;
Button btnThem , btnSua;
ArrayList<Sinhvien> arraySinhvien;
CustomAdapter myadapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
anhxa();
arraySinhvien = new ArrayList<Sinhvien>();
myadapter = new CustomAdapter(this , R.layout.item_layout,arraySinhvien);
listSinhvien.setAdapter(myadapter);
btnSua.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final int count = myadapter.getCount();
myadapter.remove(myadapter.getItem(count -1));
myadapter.notifyDataSetChanged();
return;}});
}
private void anhxa(){
listSinhvien = (ListView)findViewById(R.id.list_sinhvien);
editTen = (EditText)findViewById(R.id.edit_ten);
btnThem = (Button)findViewById(R.id.btn_add);
btnSua = (Button)findViewById(R.id.btn_undo);
btnThem.setOnClickListener(this);
btnSua.setOnClickListener(this);
}
#Override
public void onClick(View view) {
switch (view.getId()){
case R.id.btn_add:
Toast.makeText(this, "clicked", Toast.LENGTH_SHORT).show();
String ten = editTen.getText().toString();
String sdt = editTen.getText().toString();
Sinhvien temp = new Sinhvien(R.mipmap.ic_launcher,ten , sdt);
arraySinhvien.add(temp);
myadapter.notifyDataSetChanged();
break;
}
}
}
CustomAdapter.java
package com.example.addanddelete;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import java.util.ArrayList;
public class CustomAdapter extends ArrayAdapter {
Activity activity;
int layout;
ArrayList<Sinhvien> arrSinhVien;
public CustomAdapter(#NonNull Activity activity, int layout, #NonNull ArrayList<Sinhvien> arrSinhVien) {
super(activity, layout, arrSinhVien);
this.activity = activity;
this.layout = layout;
this.arrSinhVien = arrSinhVien;
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
LayoutInflater layoutInflater = activity.getLayoutInflater();
convertView = layoutInflater.inflate(layout, null);
TextView ten = (TextView) convertView.findViewById(R.id.text_score);
TextView sdt = (TextView) convertView.findViewById(R.id.text_total);
ten.setText(arrSinhVien.get(position).getTenSinhvien());
sdt.setText(arrSinhVien.get(position).getSdtSinhvien());
return convertView;
}
}
Sinhvien.java
package com.example.addanddelete;
public class Sinhvien {
String tenSinhvien;
String sdtSinhvien;
public Sinhvien(String iclauncher,String ten, String sdt) {
}
public Sinhvien(int iclauncher,String tenSinhvien, String sdtSinhvien) {
this.tenSinhvien = tenSinhvien;
this.sdtSinhvien = sdtSinhvien;
}
public String getTenSinhvien() {
return tenSinhvien;
}
public void setTenSinhvien(String tenSinhvien) {
this.tenSinhvien = tenSinhvien;
}
public String getSdtSinhvien() {
return sdtSinhvien;
}
public void setSdtSinhvien(String sdtSinhvien) {
this.sdtSinhvien = sdtSinhvien;
}
}

The general behaviour/implementation that you've outlined in your question is very well documented. That said, I'd suggest considering utilising a RecyclerView with associated custom item view and adapter, as opposed to a ListView. There are a few reasons why I'd suggest this.
I did a little searching and found several examples that cover the general idea of your implementation. This example does a great job of illustrating how to achieve what you're seeking. The article begins by outlining some reasons to work with a RecyclerView over a ListView or GridView, then proceeds to give an in-depth run-down on how to implement a RecyclerView with custom adapter (and associated item view and item class).
At a glance, your implementation would require:
An Activity containing your RecyclerView, two Buttons (used for adding and deleting elements from the RecyclerView) and an EditText for taking user input.
A custom item View representing individual items of your RecyclerView list. This would contain the two TextView views (one for displaying the integer and the other for displaying the sum of all integers).
A custom item model Class to represent the data model for the above custom item View. This would hold an integer value and likely some logic for displaying the sum.
A custom RecyclerView adapter (which ties all of the above together). This will need to handle the task of binding data from your dataset (that grows and shrinks based on user input) to instances of your custom items that are to appear in the RecyclerView list. This adapter could also be used by your add and delete item buttons to modify the elements in the RecyclerView list.
The above is outlined in far greater depth in the link I provided earlier.
I sincerely hope that helps!

How to implement clickable listview and show list details in different fragment layout?

I've managed to develop list view.I don't know how to make it clickable and show the clicked list details in different layout pages. Give me a solution to achieve this.
here is my MainActivity.java
import android.app.ListActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import android.app.Activity;
public class ActivityList extends Activity {
ListView list;
String[] web = {
"Design",
"Centers",
"Products",
"Search",
"Clients",
"About Us"
} ;
Integer[] imageId = {
R.drawable.ic_sws,
R.drawable.ic_centers,
R.drawable.ic_pc,
R.drawable.ic_fmc,
R.drawable.ic_person,
R.drawable.ic_bhs,
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.homelist);
CustomList adapter = new CustomList(ActivityList.this, web, imageId);
list=(ListView)findViewById(R.id.list);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(ActivityList.this, "You Clicked at " + web[+position], Toast.LENGTH_SHORT).show();
}
});
}
}
Here is CustomList.java
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class CustomList extends ArrayAdapter<String>{
private final Activity context;
private final String[] web;
private final Integer[] imageId;
public CustomList(Activity context,
String[] web, Integer[] imageId) {
super(context, R.layout.list_single, web);
this.context = context;
this.web = web;
this.imageId = imageId;
}
#Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View rowView= inflater.inflate(R.layout.list_single, null, true);
TextView txtTitle = (TextView) rowView.findViewById(R.id.txt);
ImageView imageView = (ImageView) rowView.findViewById(R.id.img);
txtTitle.setText(web[position]);
imageView.setImageResource(imageId[position]);
return rowView;
}
}
Hers is homelist.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ListView
android:id="#+id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</ListView>
</RelativeLayout>
here is list_single.xml
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TableRow>
<ImageView
android:id="#+id/img"
android:layout_width="50dp"
android:layout_height="50dp"
android:paddingLeft="7dp"/>
<TextView
android:id="#+id/txt"
android:layout_width="wrap_content"
android:layout_height="55dp"
android:paddingLeft="16dp"
android:paddingTop="12dp"
android:textSize="18dp"
android:textAlignment="viewEnd"
/>
</TableRow>
</TableLayout>

Making a view clickable is easy as follows;
yourView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
//Do something here
}
});
In your case, you can make your imageViews and textViews clickable. Or, you may wrap them in a button and make them completely clickable. Since in your custom list adapter, you have the position parameter, you can access the related list item's info.

There are two main methods if you want to display the information in another layout. First one is using a dialog box with your custom layout, and the second one is starting a new activity passing the required parameters. Here are details;
1- Custom Dialog Box;
You can create a default dialog box and display info. But if you want further layout style, you shoulld use custom dialog box. For that, you need to first create an XML file. In your case, you may want an ImageView and a TextView like this;
<?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="horizontal" >
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Text" />
Then you have to create a dialog box, customize it's layout, and pass the related parameters. You can all do this in your list's onItemClickListener. The arg2 parameter is the position you click in the list. So add this code inside the listener instead of toast;
Dialog dialogBox= new Dialog(MainActivity.this);
dialogBox.setContentView(R.layout.custom_layout);
dialogBox.setTitle("Info");
TextView text = (TextView) dialog.findViewById(R.id.text);
text.setText(web[arg2]);
ImageView image = (ImageView) dialog.findViewById(R.id.image);
image.setImageResource(imageId[arg2]);
dialogBox.show();
2- Start a New Activity
You have to create a new activity and layout, and pass parameters. You can simply use the same layout above, and add the activity as follows;
public class Info extends ActionBarActivity {
ImageView imageView;
TextView textView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_layout);
imageView = (ImageView) findViewById(R.id.image);
textView = (TextView) findViewById(R.id.text);
}
}
Here the main trick comes. In your list item's listener, you have to create Intent, pass Bundle, then start this activity. And in the activty, you have to obtan the Bundle, and set Views accordingly. Step by step, you can create an intent, pass bundle and create the activity as follows;
Intent mIntent = new Intent(MainActivity.this, Info.class);
Bundle mBundle = new Bundle();
mBundle.putInt("img", imageId[arg2]);
mBundle.putInt("txt", web[arg2]);
mIntent.putExtras(mBundle);
startActivity(mIntent);
But be careful, you must modify this activity to obtain the bunde and set the Views before you run above code. In Info activity we created, there are an imageView and textView. You obtain the bundle values as follows;
String text = (String) getIntent().getExtras("txt");
int resId= (int) getIntent().getExtras("img");
Then you just have to set these resources to the Views;
textView.setText(text);
imageView.setImageResource(resId);
That's it!! Now you can safely start this activity. Hope you have got the main logic.

LISTVIEW - onItemClick not working

I'm at my first steps into Android... I already read some of the answered question, and I tool a lot of tips, but I don't find how to solve my problem.
In the activity Categories.java I have a listview built starting from a database. The listview displys correctly, then I would like to start another activity from the OnItemClick, but I realized that I can't display even a toast.
I really hope some of you can help me I really don't find where is my error!! Thank you in advance!
Here is my code:
package com.example.myshopping;
import java.util.ArrayList;
import android.os.Bundle;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.app.Activity;
import android.view.View;
import android.widget.*;
import android.widget.AdapterView.OnItemClickListener;
public class Categories extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.categories);
final ListView lista= (ListView) findViewById(R.id.id_categorie);
MioDatabaseHelper myHelper;
myHelper= new MioDatabaseHelper(this);
final SQLiteDatabase db= myHelper.getReadableDatabase();
String [] columns_cat ={"nome_categoria"};
Cursor cursor= db.query("categorie", columns_cat, null, null, null, null, null);
int len= cursor.getCount();
cursor.moveToFirst();
final ArrayList <String> array_cat= new ArrayList<String>();
for (int i=0; i<(len); ++i){
array_cat.add(cursor.getString(0));
cursor.moveToNext();
}
ArrayAdapter<String> myadapter= new ArrayAdapter<String>(this, R.layout.listitem, R.id.listitemTextView, array_cat);
lista.setAdapter(myadapter);
lista.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id){
Toast.makeText(getApplicationContext(), "hello toast!!!!", Toast.LENGTH_LONG).show();
}
});
}
and here the xml file of the list items:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:descendantFocusability="blocksDescendants">
<TextView
android:id="#+id/listitemTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:includeFontPadding="false"
android:padding="5pt"
android:scrollHorizontally="false"
android:textSize="10pt" />
</LinearLayout>
and here the xml file of the categories.java file:
<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="wrap_content"
android:gravity="center_horizontal"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".Categories" >
<ListView
android:id="#+id/id_categorie"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:textIsSelectable="true">
</ListView>
</RelativeLayout>

I see basic inconsistency in your code:
R.layout.categories//in set content view
and in array adapter:
ArrayAdapter<String> myadapter= new ArrayAdapter<String>(this, R.layout.listitem, R.id.listitemTextView, array_cat);
Change R.layout.listitem to R.layout.categories
or use a different constructor.

Is android:textIsSelectable="true" and android:descendantFocusability="blocksDescendants" attributes needed in your case? Using them wrong can cause focusing problems and the click listener doesn't work. Try removing both.
Also the list item contains only one child for the LinearLayout so it could just be TextView having width set to match_parent and height wrap_contentcombined with padding.

Also if you want to specyfy textView appearance Create XML Just with that textView without parent Noode, coz lists can be ricky sometimes :P try create another XML just to test that one thingChange this:<relativeLayout>
attributes..
<textView>
attributes..
</textView>
</relativeLayout> To<TextView>
attributes
</TextView>Basicaly you want stand alone TextView

Using a layout xml as a template of repeated content in Android

I have a template layout which represents each of my rows in a ListView in my app.
Here is the photorow.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/bodylay"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="#+id/leftbigsquare"
android:layout_width="0dp"
android:layout_height="140dp"
android:layout_weight="1"
android:background="#1000b0"
android:src="#drawable/test1"
/>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#d0b0b0"
android:textSize="15sp" >
<ImageView
android:id="#+id/righttupperleft"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#b170b0"
android:src="#drawable/test1" />
<ImageView
android:id="#+id/rightupperright"
android:layout_width="0dp"
android:layout_height="70dp"
android:layout_weight="1"
android:background="#b110b0"
android:src="#drawable/test1" />
</LinearLayout>
<ImageView
android:id="#+id/righthorizontal"
android:layout_width="match_parent"
android:layout_height="70dp"
android:src="#drawable/test1" />
</LinearLayout>
It is repeated row by row. What I want to do is to change "ImageView" child, when I load the image from my server not redesign the row layout each time. Each row will show different "leftbigsquare", "rightupperleft", "rightupperright", "righthorizontal" (look at ImageViews ids) photos.
I researched and saw some examples, but they did that by hardcoding the layout such as :
LinearLayout A = new LinearLayout(this);
A.setOrientation(LinearLayout.HORIZONTAL);
I want to use my photorow.xml as template and just change its attributes such as source in each row.
Is it possible to use my photorow.xml as the template of a row ?
EDIT
My custom adapter :
package com.example.test2;
import java.util.List;
import com.squareup.picasso.Picasso;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class PhotoAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private List<PhotoRow> rowList;
Activity context = null;
public PhotoAdapter(Activity activity, List<PhotoRow> rows) {
mInflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowList = rows;
context = activity;
}
#Override
public int getCount() {
return rowList.size();
}
#Override
public Object getItem(int position) {
return rowList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView;
rowView = mInflater.inflate(R.layout.photorow, null);
//Here I get the ImageView of my photorow xml
ImageView leftBigSquare = (ImageView) rowView
.findViewById(R.id.leftbigsquare);
// Here I get the proper URL from rowList by using Picasso framework
Picasso.with(context).load(rowList.get(position).getUrls().get(0))
.resize(50, 50).centerCrop().into(leftBigSquare);
//So how can I put the leftBigSquare ImageView to my photorow template with its proper attributes
return rowView;
}
}

Yes, of course, you can use same rowview XML and still have different data in every row.
You must use a custom adapter and then inflate your row s from that adapter and based on several conditions change your data.
Paste your custom adapter code and I will show you how to do it.

Android - Retrieving a string from a specific element of a gridview

I'm pretty new to Android and I have been playing about with GridView. I've got stuck trying to retrieve Strings from individual elements of the GridView so that I can save state based on the changes a user has made.
I've mocked up a stripped down version of what I'm trying to do for this question:
The view of each element in the grid is made up of a TextView and an EditText defined by the following xml file; grid_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id = "#+id/single_item_id"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<TextView
android:id = "#+id/label"
android:layout_width = "fill_parent"
android:layout_height="wrap_content"
android:inputType="text">
</TextView>
<EditText
android:id = "#+id/item_value"
android:layout_width = "fill_parent"
android:layout_height="wrap_content"
android:inputType="text">
</EditText>
</LinearLayout>
My main.xml, consisting of a button and a gridview:
<?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" >
<Button
android:id="#+id/editbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onRetrieveButtonClick"
android:text="#string/get" android:clickable="true"/>
<GridView
android:id="#+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:columnWidth="250dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:paddingTop="50dp">
</GridView>
</LinearLayout>
My Activity Class:
package com.jdev.simplegrid;
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.GridView;
import android.widget.Toast;
public class SimpleGridActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GridView gridview = (GridView) findViewById(R.id.gridview);
//Some hard-coded sample data -each person has a birth-name and a nickname
ArrayList<Person> people = new ArrayList<Person>();
people.add(new Person("David","Dave"));
people.add(new Person("Bruce","Batman"));
people.add(new Person("John","J"));
gridview.setAdapter(new SimpleAdapter(this, people));
}
public void onRetrieveButtonClick(View view)
{
Toast.makeText(getBaseContext(), "Get the String value of EditText at position 1 of the gridview e.g Batman", Toast.LENGTH_LONG).show();
//Get the String value of EditText at position 1 of the gridview. e.g Batman
}
}
And finally my Adapter for the view:
package com.jdev.simplegrid;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.TextView;
public class SimpleAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<Person> personList;
public SimpleAdapter(Context c, ArrayList<Person> people) {
mContext = c;
personList = people;
}
public int getCount() {
return personList.size();
}
public Person getItem(int position) {
return personList.get(position);
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view=inflater.inflate(R.layout.grid_item, parent, false);
TextView birthnameLabel=(TextView)view.findViewById(R.id.birthname);
birthnameLabel.setText(personList.get(position).getBirthname());
EditText nicknameText=(EditText)view.findViewById(R.id.nickname);
nicknameText.setText(personList.get(position).getNickname());
return view;
}
}
So my question is, how do I retrieve the a value from the gridview on the click of a button. Say the value "Batman" in EditText at position 1 of the gridview.
I feel like I'm really missing something here!

gridview.getAdapter().getItem(1).getNickname();
Is that what you're looking for? assuming your Person object has a getter method for the nickname of course. - Sorry, obviously I could've seen that in your custom adapter.
If your the idea is the user can change the nickname in the EditText, you'll probably want to add a TextChangedListener (TextWatcher) to each of them and after editting update the nickname on the Person object associated with that position in the grid; e.g. with the help of a setNickname(String) method.
The easiest way to think about this is probably in terms of 'models' and 'views'. The TextViews and EditTexts are the views, whereas the Person objects in the adapter are the models. If you want to make any changes to the data, modify the underlying models with some logic and simply have the views update/refresh after that.