Android

Android listview and clickevent example
Author : Ishtek

Using Android API Level : 7 
In this tutorial we shall be covering Android's ListView API with the help
of an example with some other view elements such as TextView etc. And also
working with click event on any of the list item is being clicked.

Final screen of this listview example would look like the below image:
List of groups as initial view of this application showing two different sections as different categories. This example ListView initial screen layout as follows: main.xml
<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#FFFFFF"> <LinearLayout android:layout_gravity="top" android:layout_width="fill_parent" android:layout_height="wrap_content"> <TextView android:layout_gravity="top" android:id="@+id/txtView" android:text="My Cards 'n' My Time" android:textColor="#0000BB" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <Button android:id="@+id/btnManage" android:text="...Manage..." android:layout_width="fill_parent" android:layout_height="wrap_content"/> </LinearLayout> <LinearLayout android:layout_gravity="center" android:layout_width="fill_parent" android:layout_height="wrap_content" > <ListView android:layout_height="fill_parent" android:id="@android:id/list" android:layout_width="fill_parent" android:layout_gravity="center"> </ListView> </LinearLayout> </FrameLayout>
list_layout.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" > <TextView android:id="@+id/txtSView" android:layout_width="wrap_content" android:layout_height="fill_parent" android:textColor="#000000" android:textSize="25dp" android:duplicateParentState="true"/> </LinearLayout>
Using Android API such as ListActivity and BaseAdapter class files, those can be extended by example specific Java class files such as "ManageMyCards" extends ListActivity and a private inner class file such as "ManageMyCardsListAdapter" extends BaseAdapter class file. ManageMyCards.java
package com.techienjoy.com; import android.app.ListActivity; import android.content.Context; import android.graphics.Color; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.View.OnClickListener; import android.widget.BaseAdapter; import android.widget.LinearLayout; import android.widget.TextView; public class ManageMyCards extends ListActivity { private Context context; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); context = this; ManageMyCardsListAdapter adapter = new ManageMyCardsListAdapter(); setListAdapter(adapter); } private class ManageMyCardsListAdapter extends BaseAdapter { @Override public int getCount() { return 4; } @Override public Object getItem(int arg0) { return arg0; } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int position, View parent, ViewGroup rootView) { final int pos = position; LinearLayout view = null; LayoutInflater layoutInflator = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); view = (LinearLayout) layoutInflator.inflate(R.layout.list_layout, null); TextView txtView = (TextView) view.getChildAt(0); txtView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //Intent intent = new Intent(ManageMyCards.this,DetailScreen.class); //startActivity(intent); System.out.println(v+ "##########"+" "+pos); } }); if(position == 0) { txtView.setText("Option One"); view.setBackgroundColor(Color.argb(100, 50, 50, 200)); } if(position == 1) { txtView.setText("Option Two"); view.setBackgroundColor(Color.argb(100, 60, 60, 210)); } if(position == 2) { txtView.setText("Option Three"); view.setBackgroundColor(Color.argb(100, 70, 70, 220)); } if(position == 3) { txtView.setText("Option Four"); view.setBackgroundColor(Color.argb(100, 80, 80, 230)); } return view; } } }
As the above code is just printing the text with the position of the item clicked from the listview, one can handle the click event and do specific item level processing as well. Once all these files are placed in folders as appropriate within Eclipse Workspace and Android Project, Java files compiled and *.apk file created. Then this APK file can be published to Android Emulator for getting installed and displaying on invocation of this application at runtime.
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Please enter same number as shown here 872

Name: GirishDated: 2013-12-15 09:54:49
How to use any design pattern (GoF Design patterns) with ListView with click event propagations
to make the event propagation/delegation across various items in a ListView.

I can certainly think of Observer pattern here for the event listener aspects of ListView events.    
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