Develop Reference

OnClick Button action in Custom ListView

Actually, I was trying to implement a shopping cart using Android Studio. There is a custom list view in the main page included an "Add to Cart" button. So, whenever I click on the button the item must be added in the cart. But, I have no idea. Please guys, help me out. I'm a newbie.
Here is the Product Adapter
package com.example.raswap.octomatic;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
/**
* Created by aurora on 22/03/16.
*/
public class Pro_Adapter extends ArrayAdapter {
List list = new ArrayList();
public Pro_Adapter(Context context, int resource) {
super(context, resource);
}
static class DataHandler{
ImageView img;
TextView p_name;
TextView b_name;
TextView price;
Button b_atc;
}
#Override
public void add(Object object) {
list.add(object);
}
#Override
public int getCount() {
return this.list.size();
}
#Override
public Object getItem(int position) {
return this.list.get(position);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row;
row = convertView;
DataHandler handler;
if(convertView == null){
LayoutInflater inflater = (LayoutInflater)this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.e_layout, parent, false);
handler = new DataHandler();
handler.img = (ImageView)row.findViewById(R.id.pro_image);
handler.p_name = (TextView)row.findViewById(R.id.pro_name);
handler.b_name = (TextView)row.findViewById(R.id.brand);
handler.price = (TextView)row.findViewById(R.id.pricing);
handler.b_atc = (Button)row.findViewById(R.id.atc);
row.setTag(handler);
}else{
handler = (DataHandler)row.getTag();
}
Product_data_provider dataProvider;
dataProvider = (Product_data_provider)this.getItem(position);
handler.img.setImageResource(dataProvider.getPro_img_resource());
handler.p_name.setText(dataProvider.getPro_name());
handler.b_name.setText(dataProvider.getBr_name());
handler.price.setText(dataProvider.getPricing());
return row;
}
}
Here is the Main Activity class:
package com.example.raswap.octomatic;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
public class E_shop extends Activity {
ListView listView;
int[] emage = {R.drawable.gb32, R.drawable.tb1, R.drawable.dvd};
String[] pro_name;
String[] br_name;
String[] price;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.activity_e_shop);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_titlebar);
View z = findViewById(R.id.oct_logo);
z.setClickable(true);
z.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(E_shop.this, MainActivity.class));
}
});
View x = findViewById(R.id.for_user_info);
x.setClickable(true);
x.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(E_shop.this, UserInformation.class));
}
});
Pro_Adapter adapter = new Pro_Adapter(getApplicationContext(),R.layout.e_layout);
ListView listView = (ListView)findViewById(R.id.e_list);
listView.setAdapter(adapter);
pro_name = getResources().getStringArray(R.array.nameOfProduct);
br_name = getResources().getStringArray(R.array.branding);
price = getResources().getStringArray(R.array.pricing);
int i = 0;
for(String pro: pro_name){
Product_data_provider dataProvider = new Product_data_provider(emage[i],pro, br_name[i], price[i]);
adapter.add(dataProvider);
i++;
}
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch(position){
case 0:
Intent newActivity = new Intent(E_shop.this, Product_Desc.class);
newActivity.putExtra("pro_emage",R.drawable.gb32);
newActivity.putExtra("title","Kingston 32Gigs Pen Drive");
newActivity.putExtra("desc", "Store a huge collection of data in a generous 32GB space of this Kingston pen drive and carry it along. It has a sleek design with a smooth finish, and a pretty-looking charm bearing the Kingston logo dangles from this pen drive. Featured in a size of 3 x 1.2 x 0.5 cm, this Kingston 32GB pen drive weighs only 5g. You can easily tuck it away in the pocket of your laptop bag, purse or your shirt pocket with its compact and light weight.");
startActivity(newActivity);
break;
case 1:
Intent Activity1 = new Intent(E_shop.this, Product_Desc.class);
Activity1.putExtra("pro_emage",R.drawable.tb1);
Activity1.putExtra("title","Samsung 1TB Portable Hard Disk");
Activity1.putExtra("desc", "From college to school students, all deal with transferring files, software and applications from various systems that are large in size. With the advancements in media technology on the rise, we require a large amount of space to store our data. Even most of the growing companies require a secure means of storing data for analyses. All of this embarks on the need for a reliable hard disk. The top quality brand of Samsung brings you this sleek and portable hard drive ideally designed for continuous usage. Now you can store 2TB of diverse data easily. This, sleek hard disk comes with 36 months warranty. The body of this drive has a smart construction. The Samsung external hard disk comes in a sturdy design.");
startActivity(Activity1);
break;
case 2:
Intent Activity2 = new Intent(E_shop.this, Product_Desc.class);
Activity2.putExtra("pro_emage", R.drawable.dvd);
Activity2.putExtra("title", "A pack of 50 DVD's");
Activity2.putExtra("desc", "Create and store digital video, audio and multimedia files, Stores up to 4.7GB or more than 2 hours of MPEG2 video, Has 7 times the storage capacity of a CDR, Sony branded 16X DVD-R in a 100 pack Spindle, AccuCORE Technology");
startActivity(Activity2);
break;
}
}
#SuppressWarnings("unused")
public void onClick(View v){
}
});
}
}
Here is the Product Data Provider Class:
package com.example.raswap.octomatic;
/**
* Created by aurora on 22/03/16.
*/
public class Product_data_provider {
private int pro_img_resource;
private String pro_name;
private String br_name;
private String pricing;
public int getPro_img_resource() {
return pro_img_resource;
}
public Product_data_provider(int pro_img_resource, String pro_name, String br_name, String pricing){
this.setPro_img_resource(pro_img_resource);
this.setPro_name(pro_name);
this.setBr_name(br_name);
this.setPricing(pricing);
}
public void setPro_img_resource(int pro_img_resource) {
this.pro_img_resource = pro_img_resource;
}
public String getPro_name() {
return pro_name;
}
public void setPro_name(String pro_name) {
this.pro_name = pro_name;
}
public String getBr_name() {
return br_name;
}
public void setBr_name(String br_name) {
this.br_name = br_name;
}
public String getPricing() {
return pricing;
}
public void setPricing(String pricing) {
this.pricing = pricing;
}
}
Now, Custom ListView XML file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="blocksDescendants">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<LinearLayout
android:id="#+id/oneL"
android:layout_width="match_parent"
android:layout_height="200dp"
android:orientation="horizontal">
<ImageView
android:id="#+id/pro_image"
android:src="#drawable/gb32"
android:layout_width="160dp"
android:layout_height="match_parent" />
<LinearLayout
android:background="#afeeee"
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:textAppearance="?android:attr/textAppearanceLarge"
android:text="Product Name"
android:id="#+id/pro_name"
android:textColor="#000"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Branding"
android:id="#+id/brand"
android:textColor="#000"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
android:layout_marginBottom="10dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Price"
android:textColor="#000"
android:id="#+id/pricing"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add to Cart"
android:id="#+id/atc" />
</LinearLayout>
</LinearLayout>
<View
android:layout_below="#+id/oneL"
android:layout_width="match_parent"
android:layout_height="5dp"
android:background="#000"/>
</RelativeLayout>
</RelativeLayout>
and finally the main layout XML file:
<?xml version="1.0" encoding="utf-8"?>
<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: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="com.example.raswap.octomatic.E_shop">
<ListView
android:id="#+id/e_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>

Add your button's OnClick event in the Pro_Adapter's getView() methond as you do normally in your activities' onCreate() method.

Implement OnClickListener in your adapter class and get the Button click first and do the other task when you get the event. If you need the call back to your main activity class implement your own listener.follow the link enter link description here

Add the onClickListener to your Button in getView() of your ListAdapter.

If you want handle event click button in row, i'm think you should answer set button onclick event for every row of listview

you can try this.
Change in custom Listview xml file.
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add to Cart"
android:onClick="AddCart"
android:id="#+id/atc" />
In MainActivity
public void AddCart(View v)
{
LinearLayout vwParentRow = (LinearLayout)v.getParent();
TextView child = (TextView)vwParentRow.getChildAt(0);
child.setText("I've been clicked!");
vwParentRow.refreshDrawableState();
}

ListView onItemClickListener works on part of custom row only

I have a custom ListView where each row consists of 3 items, a TextView (title), an ImageView (placeholder icon), and another TextView (content text). I have an OnItemLongClickListener set on the ListView and it is supposed to be that when a user clicks on the item in the ListView (which should be the entire row of 3 items all together as one), then a dialog comes up giving them the option to delete the whole item, which would then delete all 3 parts of that single list item.
But long clicking on the title view and the image do not trigger the listener. Only if the content TextView is long clicked, does the dialog box come up, which then deletes all 3, but clicking anywhere in the row should do that. However it doesn't. I need to find a solution because the user will not know to only click on the content TextView, they should be able to click anywhere.
I have looked on here to find a solution, and have tried adding these lines, but nothing has worked:
android:descendantFocusability="blocksDescendants" added to my ListView's LinearLayout.
android:clickable="false" to my ImageView.
android:focusable="false" and android:focusableInTouchMode="false" to both TextViews.
I don't have anything else to try. Any ideas?
UPDATE
When I added extra lines, like #Amrit suggested (code in his answer), the whole area when long clicked does now bring up the dialog box, but it creates this strange tint on the area I click, but only if I click the title TextView or the ImageView area. Oddly, that 2nd TextView still looks good and produces the dialog box as it should. Not sure how to get rid of this misaligned tint though:
TextTab.java
package org.azurespot.cutecollection.texttab;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import org.azurespot.R;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
/**
* Created by mizu on 2/8/15.
*/
public class TextTab extends Fragment {
private ArrayList<PoemListItem> poems = new ArrayList<>();
private ListViewPoemAdapter adapter;
private ListView listView;
String[] allSDCardFiles = null;
StringBuilder text;
PoemListItem wordsFromFile;
File[] files;
PoemListItem sampleItem;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.text_tab, container, false);
adapter = new ListViewPoemAdapter(getActivity(), poems);
// Attach the adapter to a ListView
listView = (ListView) v.findViewById(R.id.text_list_view);
listView.setAdapter(adapter);
if(adapter.getCount() == 0) {
// load contents of SD card
loadSDCard();
}
setupListViewListener();
return v;
}
private void loadSDCard(){
try {
// gets directory CuteWords from sd card
File cuteWordsDir = new File(Environment.getExternalStoragePublicDirectory
(Environment.DIRECTORY_DOCUMENTS), "/Cute Words");
if (!cuteWordsDir.exists()){
cuteWordsDir.mkdir();
}
if (cuteWordsDir.isDirectory()) {
// lists all files in CuteWords, loads in Files[] array
files = cuteWordsDir.listFiles();
for (File singleFile : files) {
//Read text from file, put each line into StringBuilder
text = new StringBuilder();
BufferedReader br = new BufferedReader(new FileReader(singleFile));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append('\n');
// get full file name with ext. and text in file
wordsFromFile = new PoemListItem(singleFile.getName(), text.toString());
adapter.add(wordsFromFile);
adapter.notifyDataSetChanged();
}
}
}
// get number of files in CuteWords directory
allSDCardFiles = new String[files.length];
// create a blank String version of PoemListItem
sampleItem = new PoemListItem(" ", " ");
// add the default icon/lines remaining to ArrayList (through adapter),
// if less than 9 files on SD card
for (int i = 0; i < (9 - allSDCardFiles.length); i++) {
adapter.add(sampleItem);
}
adapter.notifyDataSetChanged();
} catch(IOException e){
e.printStackTrace();
}
}
// so you can edit any of the list items
private void setupListViewListener() {
// to delete a list item
listView.setOnItemLongClickListener(new ListView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> aView, View item,
final int pos, long id) {
if (adapter.getItem(pos) != sampleItem) {
new AlertDialog.Builder(getActivity())
.setTitle("Delete")
.setMessage("Delete these cute words?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// delete from ArrayList first
poems.remove(pos);
adapter.notifyDataSetChanged();
// get file name then delete it
String name = files[pos].getName();
File file = new File(Environment.getExternalStorageDirectory(),
"/Documents/Cute Words/" + name);
file.delete();
// clear list and adapter
poems.clear();
adapter.clear();
adapter.notifyDataSetChanged();
// after each item delete, must refresh load with new arrangement
loadSDCard();
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// do nothing
dialog.cancel();
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
return true;
}
});
}
}
ListViewPoemAdapter
package org.azurespot.cutecollection.texttab;
import android.content.Context;
import android.text.InputType;
import android.text.method.ScrollingMovementMethod;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import org.azurespot.R;
import java.util.ArrayList;
/**
* Created by mizu on 2/8/15.
*/
public class ListViewPoemAdapter extends ArrayAdapter<PoemListItem> {
private TextView poemText;
private TextView poemTitle;
private ImageView poemPlaceholder;
public ListViewPoemAdapter(Context context, ArrayList<PoemListItem> poems) {
super(context, 0, poems);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
PoemListItem poemListItem = getItem(position);
if (convertView == null) {
convertView = LayoutInflater.from(getContext())
.inflate(R.layout.text_listview_row, parent, false);
}
poemTitle = (TextView) convertView.findViewById(R.id.text_title);
poemText = (TextView) convertView.findViewById(R.id.text);
poemPlaceholder = (ImageView)convertView.findViewById(R.id.icon_placeholder_poem);
poemText.setInputType(InputType.TYPE_CLASS_TEXT |
InputType.TYPE_TEXT_FLAG_MULTI_LINE |
InputType.TYPE_TEXT_FLAG_CAP_SENTENCES);
poemText.setMovementMethod(new ScrollingMovementMethod());
poemPlaceholder.setBackgroundResource(R.drawable.ic_poem_placeholder);
poemPlaceholder.setScaleType(ImageView.ScaleType.CENTER_CROP);
poemPlaceholder.setLayoutParams(new LinearLayout.LayoutParams(150, 150));
poemTitle.setText(poemListItem.getTitle());
poemText.setText(poemListItem.getPoem());
return convertView;
}
}
text_tab.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"
android:descendantFocusability="blocksDescendants"
android:background="#2198bb">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/text_list_view"
android:layout_centerHorizontal="true"
android:layout_margin="10dp"
android:scrollbarStyle="outsideOverlay"
android:verticalScrollbarPosition="right"
android:divider="#null"/>
</LinearLayout>
text_listview_row.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="wrap_content"
android:layout_alignParentTop="true"
android:paddingBottom="20dp">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="false"
android:id="#+id/icon_placeholder_poem"
android:layout_marginRight="15dp"
android:layout_marginEnd="15dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/text_title"
android:focusable="false"
android:focusableInTouchMode="false"
android:textSize="25sp"
android:textStyle="bold|italic"
android:hint="Title"
android:ellipsize="start"/>
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/text"
android:focusable="false"
android:focusableInTouchMode="false"
android:gravity="top"
android:maxLines="10"
android:inputType="textMultiLine"
android:scrollHorizontally="false"
android:scrollbars="vertical"
android:textSize="20sp"
android:ems="10"
android:textStyle="italic"
android:hint="Quote or poem, here."
android:ellipsize="start"/>
<!--Line in-between the rows-->
<View
android:layout_width="fill_parent"
android:layout_height="2dp"
android:background="#7e8287"
android:paddingTop="20dp" />
</LinearLayout>

Set all child views inside listView items to not focusable or clickable.
android:focusable="false"
android:clickable="false"
If it is not enough try setting
android:descendantFocusability="blocksDescendants
to text_listview_row.xml linearlayout &
android:textIsSelectable="false"
to textview's inside text_listview_row.xml
UPDATE
Actually all that I needed was that one line android:descendantFocusability="blocksDescendants" but inside of my LinearLayout parent of the text_listiew_row.xml (not needed in text_tab.xml). Thank you!

Try setting the below tag fro your views inside list item view xml (text_listview_row.xml)
android:focusable="false"
so that list item click will work always perfectly

I think the problem lies in this line:
if (adapter.getItem(pos) != sampleItem) {
Add log before to verify that method was invoked successfully.
Log.d("TextTab", "onItemLongClick");
if (adapter.getItem(pos) != sampleItem) {
...

This isn't your case, but I had similar problem with click on a custom layout item. After a hour of looking for solution a found out that I set android:inputType to TextView inside my layout file which was blocking onClick() listener
(no idea why)
Don't use android:inputType with TextView.
It worked perfectly for me

Asked by many, The TextViews in list should not have width match parent.
Even if you set the "Focusable" to false it wont work.
Set the TextView Width to wrap_content
<TextView
android:id="#+id/itemchild"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
...

How to create dynamic controls and store the values in sqlite?

Iam doing an android application. In that i want to create dynamic controls(edittext) like android core contacts application. After entering data in the ediitext i want to save the data to sqlite database by clicking a button named save. As Iam new to android i dont have any idea to create dynamic controls and storing its row values. Please help me if anybody knows.
My code:
package com.xiaochaoyang.dynamicviews;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
public class MainActivity extends Activity {
// Parent view for all rows and the add button.
private LinearLayout mContainerView;
// The "Add new" button
private Button mAddButton;
// There always should be only one empty row, other empty rows will
// be removed.
private View mExclusiveEmptyView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.row_container);
mContainerView = (LinearLayout) findViewById(R.id.parentView);
mAddButton = (Button) findViewById(R.id.btnAddNewItem);
// Add some examples
inflateEditRow("Xiaochao");
inflateEditRow("Yang");
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// TODO: Handle screen rotation:
// encapsulate information in a parcelable object, and save it
// into the state bundle.
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
// TODO: Handle screen rotation:
// restore the saved items and inflate each one with inflateEditRow;
}
// onClick handler for the "Add new" button;
public void onAddNewClicked(View v) {
// Inflate a new row and hide the button self.
inflateEditRow(null);
//v.setVisibility(View.GONE);
}
// onClick handler for the "X" button of each row
public void onDeleteClicked(View v) {
// remove the row by calling the getParent on button
mContainerView.removeView((View) v.getParent());
}
// Helper for inflating a row
private void inflateEditRow(String name) {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View rowView = inflater.inflate(R.layout.row, null);
final ImageButton deleteButton = (ImageButton) rowView
.findViewById(R.id.buttonDelete);
final EditText editText = (EditText) rowView
.findViewById(R.id.editText);
if (name != null && !name.isEmpty()) {
editText.setText(name);
} else {
mExclusiveEmptyView = rowView;
//deleteButton.setVisibility(View.INVISIBLE);
}
// A TextWatcher to control the visibility of the "Add new" button and
// handle the exclusive empty view.
editText.addTextChangedListener(new TextWatcher() {
#Override
public void afterTextChanged(Editable s) {
if (s.toString().isEmpty()) {
//mAddButton.setVisibility(View.GONE);
//deleteButton.setVisibility(View.INVISIBLE);
if (mExclusiveEmptyView != null
&& mExclusiveEmptyView != rowView) {
mContainerView.removeView(mExclusiveEmptyView);
}
mExclusiveEmptyView = rowView;
} else {
if (mExclusiveEmptyView == rowView) {
mExclusiveEmptyView = null;
}
mAddButton.setVisibility(View.VISIBLE);
deleteButton.setVisibility(View.VISIBLE);
}
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
});
// Inflate at the end of all rows but before the "Add new" button
mContainerView.addView(rowView, mContainerView.getChildCount() );
}
}
My layouts:
Row Cointainer.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/parentView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:animateLayoutChanges="true"
android:orientation="vertical" >
<ScrollView
android:id="#+id/ScrollView01"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<Button
android:id="#+id/btnAddNewItem"
android:layout_width="21dp"
android:layout_height="wrap_content"
android:background="#drawable/transparent_background"
android:gravity="center_vertical"
android:onClick="onAddNewClicked"
android:layout_gravity="right"
android:paddingLeft="5dp"
android:text="+"
android:textColor="#android:color/black" />
</ScrollView>
</LinearLayout>
Row.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="50dp"
android:orientation="horizontal" >
<EditText
android:id="#+id/editText"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:singleLine="true"
android:ems="10"
android:hint="" >
<requestFocus />
</EditText>
<Spinner
android:id="#+id/spinnerCategory"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.15"
android:entries="#array/categories"
android:gravity="right" />
<ImageButton
android:id="#+id/buttonDelete"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:src="#drawable/content_remove"
android:background="#drawable/transparent_background"
android:contentDescription="#string/button_delete_row_description"
android:onClick="onDeleteClicked"/>
</LinearLayout>

First of all, while posting your question in SO, please show what have you tried so far, post your logcat if your app is getting force closed.
To work with controls, please refer to http://developer.android.com/reference/packages.html
There you find the methods available to work with controls.
Check this link: http://www.androidhive.info/2011/11/android-sqlite-database-tutorial/
It helps to learn and perform CRUD operations on SQLite Database.
At last, what you left with is, get data (or input) from controls, and insert into database.
Also, please go for googling.

Android: duplicate items in ListVew. Maybe getView() called too many times?

I am trying to create a simple program which displays a "shopping
cart" list of items, along with a few buttons below it to manage the
cart.
The biggest problem is that items are getting duplicate entries in the
list view. That is, for every item I want to enter I see it appear
two times in the list view. What's the problem? Also, the scrollable
area of my cart is not big enough. How do I set it so that it is
bigger but I can still see my buttons? Perhaps I should put the
buttons above the cart?
Here is my shopping cart's layout XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Shopping Cart" />
<ScrollView android:id="#+id/ScrollView01"
android:layout_width="fill_parent"
android:layout_height="110px">
<ListView
android:id="#+id/BookList"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ListView>
</ScrollView>
<Button android:text="Add Another Book"
android:id="#+id/AddAnother"
android:layout_width="250px"
android:textSize="18px"
android:layout_height="55px">
</Button>
<Button android:text="Checkout"
android:id="#+id/Checkout"
android:layout_width="250px"
android:textSize="18px"
android:layout_height="55px">
</Button>
</LinearLayout>
Here is the layout for individual row items:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="8dip">
<LinearLayout
android:orientation="vertical"
android:layout_width="0dip"
android:layout_weight="1"
android:layout_height="fill_parent">
<TextView
android:id="#+id/BookTitle"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:singleLine="true"
android:gravity="center_vertical"
/>
<TextView
android:id="#+id/BookPrice"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:singleLine="true"
android:ellipsize="marquee"
/>
</LinearLayout>
<Button
android:id="#+id/buttonLine"
android:gravity="center"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_alignParentRight="true"
android:text="Delete"
/>
</LinearLayout>
here is the java code for the shopping cart activity:
package com.sellbackyourbook.sellback;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import android.app.Activity;
//import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
public class cart extends Activity
{
private ListView m_bookListView;
private BookAdapter m_adapter;
//private static String[] data = new String[] = { ""
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState)
{
ShoppingCartSingleton shoppingCart = ShoppingCartSingleton.getInstance();
super.onCreate(savedInstanceState);
setContentView(R.layout.shoppingcart);
this.m_adapter = new BookAdapter(this, R.layout.cartitem,
shoppingCart.m_books);
m_bookListView = (ListView) findViewById(R.id.BookList);
m_bookListView.setAdapter(this.m_adapter);
//setListAdapter(this.m_adapter);
if (shoppingCart.m_books != null && shoppingCart.m_books.size() > 0)
{
//m_adapter.notifyDataSetChanged();
try
{
//m_adapter.clear();
//for(int i=0;i<1;i++)
Log.i("ARRAY", "m_books.size() before loop" + shoppingCart.m_books.size());
int size = shoppingCart.m_books.size();
for(int i=0;i<size;i++)
{
Log.i("ARRAY", "size in loop" + size);
Log.i("ARRAY", "adding item to adapter" + i);
m_adapter.add(shoppingCart.m_books.get(i));
}
} catch (RuntimeException e) {
e.printStackTrace();
}
//m_adapter.notifyDataSetChanged();
}
Button buttonAddAnother = (Button) findViewById(R.id.AddAnother);
buttonAddAnother.setOnClickListener(new View.OnClickListener()
{
public void onClick(View view)
{
Intent intent = new Intent();
setResult(RESULT_OK, intent);
finish();
}
});
// TODO: only show this button if the shopping cart is not empty
Button buttonCheckout = (Button) findViewById(R.id.Checkout);
buttonCheckout.setOnClickListener(new View.OnClickListener()
{
public void onClick(View view)
{
// TODO: open sellbackyourbook website using book ISBNs
ShoppingCartSingleton shoppingCart = ShoppingCartSingleton.getInstance();
String isbnList = "";
String checkoutURL = "http://www.sellbackyourbook.com/androidcart.php?isbn=";
for (Iterator<Book> i = shoppingCart.m_books.iterator(); i.hasNext(); )
{
Book currentBook = (Book) i.next();
isbnList = isbnList + currentBook.getBookISBN() + ",";
}
checkoutURL = checkoutURL + isbnList;
Log.i("CHECKOUT URL", "checkout URL to submit: " + checkoutURL);
Intent myIntent = new Intent(Intent.ACTION_VIEW);
myIntent.setData(Uri.parse(checkoutURL));
startActivity(myIntent);
}
});
}
private class BookAdapter extends ArrayAdapter<Book> {
private ArrayList<Book> books;
public BookAdapter(Context _context, int _textViewResourceId, ArrayList<Book> _books)
{
super(_context, _textViewResourceId, _books);
this.books = _books;
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
System.out.println("getView " + position + " " + convertView);
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.cartitem, null);
}
Book b = books.get(position);
if (b != null)
{
TextView bTitle = (TextView) v.findViewById(R.id.BookTitle);
TextView bPrice = (TextView) v.findViewById(R.id.BookPrice);
if (bTitle != null)
{
bTitle.setText(b.getBookTitle());
}
if (bPrice != null)
{
bPrice.setText(b.getBookPrice());
}
}
return v;
}
}
}
Here is the Java code for my shopping cart. Am I using the singleton correctly? I really just wanted a quick and dirty way to allow multiple activities access to the shopping cart, as a different activity actually grabs the books from the user and this activity displays them in the cart.
I had an issue iterating through the books in onCreate() as well. the size() function kept increasing in the loop for some reason, so I changed the code and added a "size" variable to avoid making the size() call in the loop itself. I'm not really sure what that was all about.

I'm doing exactly the same thing and my getView is not called at all.
here is the script I was inspired by maybe it would help :
http://mfarhan133.wordpress.com/2010/10/14/list-view-tutorial-for-android/

Yes you are right at the point of BookAdapter's constructor. But the getView() method of BookAdapter is wrong. Please have a look at http://www.youtube.com/watch?v=wDBM6wVEO70 (from Google) to get the right way on how to work with ListView.

Removing the loop where I had this fixed the problem:
m_adapter.add(shoppingCart.m_books.get(i));
It seems like the BookAdapter constructor already took care of populating it, so I was duplicating the items by using the add() method.

Resource not found TextView

I am taking my first steps in Android and am starting with a very simple app which keeps track of progress through a knitting pattern and shows the instructions for the relevant row.
I want to update a couple of TextView objects programmatically. However, using getViewById() does not seem to identify them properly and the app crashes.
Having searched on Google it seems there are sometimes problems with the XML namespace in the layout XML but mine looks OK. Is it something to do with scope, perhaps?
instructions.java (this is the only activity)
package uk.co.oketchup.blanketsquare;
import android.app.Activity;
import android.os.Bundle;
import android.content.SharedPreferences;
import android.widget.Button;
import android.widget.TextView;
import android.view.View.OnClickListener;
import android.view.View;
public class instructions extends Activity
{
private int mRow;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
/* retrieve row from shared preferences, or start from zero if nothing there */
SharedPreferences settings = getPreferences(MODE_PRIVATE);
mRow = settings.getInt("row",0);
setContentView(R.layout.main);
/* associate onClick listeners with the two buttons */
final Button btnIncrement = (Button) findViewById(R.id.increment);
btnIncrement.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// Increment row
++mRow;
calcAndUpdate();
}
});
final Button btnDecrement = (Button) findViewById(R.id.decrement);
btnDecrement.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// Decrement row
--mRow;
calcAndUpdate();
}
});
}
private void calcAndUpdate() {
String Instructions;
int knit1;
int knit2;
int remaining;
if (mRow%2 == 1 )
{
/* Odd row */
knit1 = 40 - mRow;
Instructions = "K" + knit1;
remaining = knit1;
}
else
{
/* Even row */
knit1 = 18 - mRow/2;
knit2 = knit1 + 1;
Instructions = "Sl 1, k" + knit1 + ", [sl 1 kwise] 2 times, k1, p2sso, k" + knit2;
remaining = knit1 + knit2 + 2;
}
/* Update the display */
TextView tRow = (TextView) findViewById(R.id.row);
TextView tInstr = (TextView) findViewById(R.id.instr);
TextView tStRem = (TextView) findViewById(R.id.stitchremain);
/* Set the text */
tRow.setText(mRow);
tInstr.setText(Instructions);
tStRem.setText(remaining);
}
}
/res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="#+id/row"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Row"
/>
<TextView
android:id="#+id/instr"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Instructions"
android:layout_below="#id/row"
/>
<Button
android:id="#+id/increment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+"
android:layout_alignParentBottom="true" />
<Button
android:id="#+id/decrement"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:layout_toRightOf="#id/increment"
android:layout_alignParentBottom="true" />
<TextView
android:id="#+id/stitchremain"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="stitches remaining"
android:layout_above="#id/increment"
/>
</RelativeLayout>
The TextView objects seem to have been registered ok as they appear in R.java
public static final class id {
public static final int decrement=0x7f050003;
public static final int increment=0x7f050002;
public static final int instr=0x7f050001;
public static final int row=0x7f050000;
public static final int stitchremain=0x7f050004;
}
Here is the error message shown in ddms.
Uncaught handler: thread main exiting due to uncaught exception
android.content.res.Resources$NotFoundException: String resource ID #0x1
at android.content.res.Resources.getText(Resources.java:200)
at android.widget.TextView.setText(TextView.java:2813)
at uk.co.oketchup.blanketsquare.instructions.calcAndUpdate(instructions.java:75)
at uk.co.oketchup.blanketsquare.instructions.access$100(instructions.java:11)
at uk.co.oketchup.blanketsquare.instructions$1.onClick(instructions.java:33)
[etc]
Many thanks for your help.

mRow is an integer. When you call setText(mRow) on line 75, it thinks that you are trying to set the text with a String resource with ID = the value of mRow.
Instead, do:
tRow.setText(Integer.toString(mRow));

You should always convert other values to string before setting it to textview, like
txtX.setText(Integer.toString(intVal));