Develop Reference

How to know which button user clicked and its text and id in Android Studio?

Through out the whole android application I want to capture button click, radio button clicks, link click etc... basically a user interaction in whole android application. Is there any common method to detect which element user click and its values.?

Try using onCickListener() on the buttons.

In Kotlin:
Add id to button in .xml files with android:id="#+id/nameOfButton". Every button needs an unique name.
In .kt file, use setOnClickListener with the id to set up the action when user click the button.
If there are several buttons, just follow step 1 and 2.
Example:
step 1
<Button
android:id="#+id/buttonSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Save" />
step 2
buttonSave.setOnclickListenter {
//TODO: your code goes here
}

Its very simple you just need to get the text and id of button from the onclick method. Here is java and xml code for it:
XML:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
android:onclick="getid"
android:text="Save" />
JAVA:
public void getid(View v){
int id = v.getId();
String text = v.getText();
}

As #Muthukumar Lenin asked here is listview in xml and java
XML:
<?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:id="#+id/rl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
tools:context=".MainActivity">
<TextView
android:id="#+id/textview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textStyle="italic"
android:textColor="#5f65ff"
android:padding="5dp"
android:text="Choose is the best football player?"/>
<ListView
android:id="#+id/listview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/textview" />
</RelativeLayout>
JAVA:
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView listView = (ListView) findViewById(R.id.listview);
final TextView textView = (TextView) findViewById(R.id.textview);
String[] players = new String[] {"CR7", "Messi", "Hazard", "Neymar"};
List<String> Players_list = new ArrayList<String>(Arrays.asList(players));
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Players_list);
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String selectedItem = (String) parent.getItemAtPosition(position);
textView.setText("The best football player is : " + selectedItem);
}
});
}
}
Some of these code are from tutorialspoint and some are edited by me.

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!

tab as like fileexploler

How can i put tab as like this at above..
i want this type of tab when i click item it show on above,can anyone give snippet or links..
and please tell brief if available how can i do this..
as show in figure the red rectangle is there any android tools for that or library....
or directly i can do by code??
Thanks in advance
Rectangle describe what i want
belove is image
..

I have made a simple project for you. You should make it more beautiful as I wasn't focusing on that, just on the code.
First add these values to your color.xml
<resources>
<color name="buttonGrey">#7A7A7A</color>
<color name="layoutHolderStartColor">#F7F7F7</color>
<color name="layoutHolderEndColor">#E1E1E1</color>
</resources>
Next create some background for the button holder and name it gradient_button_holder.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:startColor="#color/layoutHolderStartColor"
android:endColor="#color/layoutHolderEndColor"
android:angle="270"
/>
<corners android:radius="3dp" />
</shape>
Now create activity_main.xml
Note: I am using some images, download the whole project at the bottom and get them out
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout
android:id="#+id/pathHolder"
android:layout_width="match_parent"
android:layout_height="35dp"
android:layout_alignParentTop="true"
android:background="#drawable/gradient_button_holder"
android:gravity="center_vertical">
<Button
android:id="#+id/btnAdd"
android:layout_width="29dp"
android:layout_height="29dp"
android:layout_alignParentRight="true"
android:layout_marginBottom="3dp"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
android:layout_marginTop="3dp"
android:background="#color/buttonGrey"
android:gravity="center"
android:onClick="onBtnAdd"
android:text="+"
android:textSize="15sp"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="#string/app_name"
android:src="#drawable/seperator"
android:visibility="gone"/>
<HorizontalScrollView
android:id="#+id/btnScrollView"
android:layout_width="wrap_content"
android:layout_height="35dp"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="#id/btnAdd">
<LinearLayout
android:id="#+id/btnFolderHolder"
android:layout_width="wrap_content"
android:layout_height="35dp"
android:orientation="horizontal">
</LinearLayout>
</HorizontalScrollView>
</RelativeLayout>
</RelativeLayout>
Next create the Utils class
import android.annotation.SuppressLint;
import android.os.Build;
import android.view.View;
import java.util.concurrent.atomic.AtomicInteger;
public class Utils {
private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);
/**
* Generate a value suitable for use in setId(int}.
* This value will not collide with ID values generated at build time by aapt for R.id.
*
* #return a generated ID value
*/
private static int generateViewId() {
for (; ; ) {
final int result = sNextGeneratedId.get();
// aapt-generated IDs have the high byte nonzero; clamp to the range under that.
int newValue = result + 1;
if (newValue > 0x00FFFFFF) {
newValue = 1; // Roll over to 1, not 0.
}
if (sNextGeneratedId.compareAndSet(result, newValue)) {
return result;
}
}
}
#SuppressLint("NewApi")
public static int generateId() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {
return generateViewId();
}
else {
return View.generateViewId();
}
}
}
And finally the MainActivity
import android.graphics.Color;
import android.os.Environment;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.Button;
import android.widget.HorizontalScrollView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import java.io.File;
public class MainActivity extends ActionBarActivity {
private LinearLayout btnHolder;
private HorizontalScrollView scroller; //parent folders
private ViewTreeObserver observer; //needed for the scroll to the end
private Toast toast;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
makeButtons(Environment.getExternalStorageDirectory().getPath(), "Folder1", "Folder2", "Folder3");
}
private void makeButtons(String... values) {
StringBuilder sb = new StringBuilder(values.length * 2);
for (int i = 0; i < values.length - 1; ++i) {
sb.append(values[i]);
sb.append(File.separator);
addButton(values[i], sb.toString(), true);
}
sb.append(values[values.length - 1]);
addButton(values[values.length - 1], sb.toString(), false);
}
private void init() {
setWidgetConnections();
observer = scroller.getViewTreeObserver();
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
public void onGlobalLayout() {
// this will always scroll to the last folder (displayed on the
// right)
scroller.fullScroll(HorizontalScrollView.FOCUS_RIGHT);
}
});
}
private void setWidgetConnections() {
btnHolder = (LinearLayout) findViewById(R.id.btnFolderHolder);
scroller = (HorizontalScrollView) findViewById(R.id.btnScrollView);
}
public void onBtnAdd(View v) {
}
private void addButton(final String text, final String path, boolean withImage) {
// Dynamic call to add buttons
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
Button btn = new Button(this);
btn.setId(Utils.generateId());
btn.setText(text);
btn.setTextColor(Color.BLACK);
btn.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 12);
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
goToPath(path);
}
});
//btn.setBackgroundResource(R.drawable.gradient_button_holder);
btnHolder.addView(btn, params);
if (withImage) {
ImageView view = new ImageView(this);
view.setBackgroundResource(R.drawable.seperator2);
btnHolder.addView(view, params);
}
}
private void goToPath(String path) {
showToast(path);
}
private void showToast(String text) {
if (toast != null) {
toast.cancel();
}
toast = Toast.makeText(this, text, Toast.LENGTH_SHORT);
toast.show();
}
}
This is the final result and also note that it is horizontally scrollable
You can download the whole project here

It can be possible through your code,
In that Linear Layout you have to dynamically insert another layout having an image view represents the ">" and the text view used to reprsent the directory
the layout would be looks like that sort of
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/arrow_image"
android:text="Storage"/>
<ImageView
android:id="#+id/arrow_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/arrow"
android:layout_alignParentLeft="true"
android:layout_alignBottom="#id/textView"
android:layout_alignTop="#id/textView"/>
</RelativeLayout>
While adding the View dynamically you just need to maintain the list of views added in account for clickevents, which would enables you to switch into the directories directly. And just remove that view from your view list as you move back to the previous directory, and that's all! you have made it.
and your code snippet will be look like this
final ArrayList<View> myDynamicView = new ArrayList<>();
//it would be your list item click
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
LayoutInflater inflater = LayoutInflater.from(getActivity());
View dynamicView = inflater.inflate(R.layout.field_layout, null);
dynamicView.setId(unique_id); // create a unique id to refer a view
TextView directoryName = (TextView) view.findViewById(R.id.textView);
directoryName.setText(your_directory_name);//Either fetch it through your array or by extracting the view
myDynamicView.add(myDynamicView.size(), dynamicView);
linearLayout.addView(dynamicView);
dynamicView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
for(int i= 0; i < myDynamicView.size(); i++){
//When view is clicked match the view id from the view list
if(myDynamicView.get(i).getId() == v.getId()){
//when view id got matched it means remove those view which are ahead of it
//from the list as well as from the linear layout
for(int j = i; j < myDynamicView.size(); j++){
View view = myDynamicView.get(j);
linearLayout.removeView(view);
myDynamicView.remove(j);
}
//update list
}
}
}
});
//update your list
}
});

This actually is done using Creating Swipe Views and updating the divider of tabs, or you can even customize the implementation by using HorizontalScrollView and adding a child when going in a folder and removing last child when going back.

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.