Many types of widgets are used in an Android Custom ListView. I introduced the Custom ListView having an ImageView and TextViews at [Android Custom ListView. (How to customize an Android ListView.)].
In this article, I'll explain that how to add button to an Android Custom ListView.
The item of the ListView is organized as follows.
2.1 Workflow
2.2 Add a ListView to the Activity.
Declare "<ListView>" to "content_main.xml"(or "activity_main.xml") that is layout resource XML file of MainActivity.
[STEP-1] "content_main.xml" - Declare "<ListView>"
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.madwin.listviewbuttonexample.MainActivity"
tools:showIn="@layout/activity_main">
<ListView
android:id="@+id/listview1"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
Add the item's layout XML file. The file name is "listview_btn_item.xml".
[STEP-2] "/res/layout/listview_btn_item.xml" - Configure ListView item's layout.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="@+id/imageView1"
android:layout_weight="1" />
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text=""
android:id="@+id/textView1"
android:textSize="16dp"
android:textColor="#000000"
android:gravity="center_vertical"
android:layout_weight="4" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Select No"
android:layout_weight="1" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Execute Toast"
android:layout_weight="1" />
</LinearLayout>
2.4 Define class for the ListView item.
Do you remember that you define class for the Custom ListView item at [Android Custom ListView. (How to customize an Android ListView.)]? Define class in the same way.
[STEP-3] "ListViewBtnItem.java" - Define class for ListView item.
import android.graphics.drawable.Drawable;
public class ListViewBtnItem {
private Drawable iconDrawable ;
private String textStr ;
public void setIcon(Drawable icon) {
iconDrawable = icon ;
}
public void setText(String text) {
textStr = text ;
}
public Drawable getIcon() {
return this.iconDrawable ;
}
public String getText() {
return this.textStr ;
}
}
2.5 Implement the custom adapter.
In this example, I use an ArrayAdapter instead of a BaseAdapter.
[STEP-4] "ListViewBtnAdapter.java" - Implement the custom adapter.
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
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 java.io.ByteArrayOutputStream;
import java.util.ArrayList;
public class ListViewBtnAdapter extends ArrayAdapter implements View.OnClickListener {
// define a listener interface for Button click event.
public interface ListBtnClickListener {
void onListBtnClick(int position) ;
}
// save the resource id from the constructor.
int resourceId ;
// save ListBtnClickListener from the constructor.
private ListBtnClickListener listBtnClickListener ;
// the constructor of ListViewBtnAdapter
ListViewBtnAdapter(Context context, int resource, ArrayList<ListViewBtnItem> list, ListBtnClickListener clickListener) {
super(context, resource, list) ;
// copy resource id.
this.resourceId = resource ;
this.listBtnClickListener = clickListener ;
}
// return the view for the item.
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final int pos = position ;
final Context context = parent.getContext();
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(this.resourceId/*R.layout.listview_btn_item*/, parent, false);
}
// get the view widget's reference.
final ImageView iconImageView = (ImageView) convertView.findViewById(R.id.imageView1);
final TextView textTextView = (TextView) convertView.findViewById(R.id.textView1);
// get the item data.
final ListViewBtnItem listViewItem = (ListViewBtnItem) getItem(position);
// update view by the item data.
iconImageView.setImageDrawable(listViewItem.getIcon());
textTextView.setText(listViewItem.getText());
// process button1 click event.
Button button1 = (Button) convertView.findViewById(R.id.button1);
button1.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
textTextView.setText(Integer.toString(pos + 1) + " item is selected.");
}
});
// save the position to button2's tag and set this adapter as the click event listener.
Button button2 = (Button) convertView.findViewById(R.id.button2);
button2.setTag(position);
button2.setOnClickListener(this);
return convertView;
}
// process button2 click event.
public void onClick(View v) {
if (this.listBtnClickListener != null) {
this.listBtnClickListener.onListBtnClick((int)v.getTag()) ;
}
}
}
2.6 Add the function for loading sample data.
Add the function for loading sample data.
[STEP-5] "MainActivity.java" - load data.
public boolean loadItemsFromDB(ArrayList<ListViewBtnItem> list) {
ListViewBtnItem item ;
int i ;
if (list == null) {
list = new ArrayList<ListViewBtnItem>() ;
}
i = 1 ;
// create items.
item = new ListViewBtnItem() ;
item.setIcon(ContextCompat.getDrawable(this, R.drawable.ic_account_box_black_36dp)) ;
item.setText(Integer.toString(i) + " item.") ;
list.add(item) ;
i++ ;
item = new ListViewBtnItem() ;
item.setIcon(ContextCompat.getDrawable(this, R.drawable.ic_account_circle_black_36dp)) ;
item.setText(Integer.toString(i) + " item.") ;
list.add(item) ;
i++ ;
item = new ListViewBtnItem() ;
item.setIcon(ContextCompat.getDrawable(this, R.drawable.ic_language_black_36dp)) ;
item.setText(Integer.toString(i) + " item.") ;
list.add(item) ;
i++ ;
item = new ListViewBtnItem() ;
item.setIcon(ContextCompat.getDrawable(this, R.drawable.ic_lightbulb_outline_black_36dp)) ;
item.setText(Integer.toString(i) + " item.") ;
list.add(item) ;
return true ;
}
2.7 Create the Adapter and set it to the ListView.
Create the Adapter and set it to the ListView.
[STEP-6] "MainActivity.java" - Create the Adapter and set it to the ListView in onCreate().
@Override
protected void onCreate(Bundle savedInstanceState) {
ListView listview ;
ListViewBtnAdapter adapter;
ArrayList<ListViewBtnItem> items = new ArrayList<ListViewBtnItem>() ;
// load items.
loadItemsFromDB(items) ;
// create the adapter.
adapter = new ListViewBtnAdapter(this, R.layout.listview_btn_item, items, this) ;
// set the adapter to the ListView.
listview = (ListView) findViewById(R.id.listview1);
listview.setAdapter(adapter);
}
Below codes were already wrote in previous steps.
But I'll write them once more for showing that how to process the button's click event.
"[STEP-7.1]" shows that how to process the button's simple click event.
[STEP-7.1] "ListViewBtnAdapter.java" - process button1 click event
// process button1 click event.
Button button1 = (Button) convertView.findViewById(R.id.button1);
button1.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
textTextView.setText(Integer.toString(pos + 1) + " item is selected.");
}
});
"[STEP-7.2] ~ [STEP-7.5]" shows that how to transfer the ListView item's click event to MainActivity.
[STEP-7.2] "ListViewBtnAdapter.java" - define a listener interface for Button click event.
public class ListViewBtnAdapter extends ArrayAdapter implements View.OnClickListener {
// define a listener interface for Button click event.
public interface ListBtnClickListener {
void onListBtnClick(int position) ;
}
// save ListBtnClickListener from the constructor.
private ListBtnClickListener listBtnClickListener ;
// ...
}
[STEP-7.3] "ListViewBtnAdapter.java" - add the listener to constructor's parameter.
public class ListViewBtnAdapter extends ArrayAdapter implements View.OnClickListener {
// ...
ListViewBtnAdapter(Context context, int resource, ArrayList<ListViewBtnItem> list, ListBtnClickListener clickListener) {
super(context, resource, list) ;
// copy resource id.
this.resourceId = resource ;
this.listBtnClickListener = clickListener ;
}
// ...
}
[STEP-7.4] "ListViewBtnAdapter.java" - call onListBtnClick() of ListBtnClickListener.
// process button2 click event.
public void onClick(View v) {
// call onListBtnClick() of ListBtnClickListener.
if (this.listBtnClickListener != null) {
this.listBtnClickListener.onListBtnClick((int)v.getTag()) ;
}
}
[STEP-7.5] "MainActivity.java" - extends ListViewBtnAdapter.ListBtnClickListener.
public class MainActivity extends AppCompatActivity implements ListViewBtnAdapter.ListBtnClickListener {
// ...
@Override
public void onListBtnClick(int position) {
Toast.makeText(this, Integer.toString(position+1) + " item is selected.", Toast.LENGTH_SHORT).show() ;
}
}
2.9 Build and run.
Build and run "app".
3. Screenshot.
4. References.
- How to use an Android ListView.
-
How to customize an Android ListView.
-
Android ListView.
.END.
