Dynamic Add and delete instance code of data in Android ListView _android

Main.xml file:

Copy Code code as follows:

<?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"

>

<linearlayout

Android:layout_width= "Fill_parent"

android:layout_height= "Fill_parent"

android:orientation= "Vertical"

>

<listview

Android:id= "@+id/listview"

Android:layout_width= "Fill_parent"

android:layout_height= "Wrap_content"

/>

<button

Android:id= "@+id/add"

Android:layout_width= "Wrap_content"

android:layout_height= "Wrap_content"

android:text= "Add"

/>

</LinearLayout>

</LinearLayout>

Listview_item.xml file:

Copy Code code as follows:

<?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= "Wrap_content"

android:orientation= "Horizontal"

Android:background= "#000000"

Android:padding= "20DP"

>

<edittext

Android:id= "@+id/edit"

Android:layout_width= "200DP"

android:layout_height= "Wrap_content"

/>

<button

Android:id= "@+id/del"

Android:layout_width= "Wrap_content"

android:layout_height= "Wrap_content"

android:text= "Delete"

/>

</LinearLayout>

Mainactivity. java

Copy Code code as follows:

Package com.yyy.testandroid;

Import java.util.ArrayList;

Import android.app.Activity;

Import Android.content.Context;

Import Android.os.Bundle;

Import Android.view.LayoutInflater;

Import Android.view.View;

Import Android.view.View.OnClickListener;

Import Android.view.View.OnFocusChangeListener;

Import Android.view.ViewGroup;

Import Android.widget.BaseAdapter;

Import Android.widget.Button;

Import Android.widget.EditText;

Import Android.widget.ListView;

Import Android.widget.TextView;

public class Testandroidactivity extends activity {

/** called the activity is a. */

Private Button Button,add;

private TextView text;

Private ListView ListView;

Public Myadapter adapter;

@Override

public void OnCreate (Bundle savedinstancestate) {

Super.oncreate (savedinstancestate);

Setcontentview (R.layout.main);

ListView = (ListView) Findviewbyid (R.id.listview);

Add = (Button) Findviewbyid (R.id.add);

adapter = new Myadapter (this);

Listview.setadapter (adapter);

Add.setonclicklistener (New Onclicklistener () {

@Override

public void OnClick (View arg0) {

TODO auto-generated Method Stub

Adapter.arr.add ("");

Adapter.notifydatasetchanged ();

}

});

}

Private class Myadapter extends Baseadapter {

private context;

Private Layoutinflater Inflater;

Public arraylist<string> arr;

Public Myadapter {

Super ();

This.context = context;

Inflater = Layoutinflater.from (context);

arr = new arraylist<string> ();

for (int i=0;i<3;i++) {//listview initializes 3 subkeys

Arr.add ("");

}

}

@Override

public int GetCount () {

TODO auto-generated Method Stub

return Arr.size ();

}

@Override

Public Object getitem (int arg0) {

TODO auto-generated Method Stub

return arg0;

}

@Override

public long getitemid (int arg0) {

TODO auto-generated Method Stub

return arg0;

}

@Override

Public View GetView (final int position, view view, ViewGroup arg2) {

TODO auto-generated Method Stub

if (view = = null) {

View = Inflater.inflate (R.layout.list_item, NULL);

}

Final EditText edit = (edittext) View.findviewbyid (R.id.edit);

Edit.settext (Arr.get (position)); When refactoring adapter, it's not data-disordered.

Button del = (button) View.findviewbyid (R.id.del);

Edit.setonfocuschangelistener (New Onfocuschangelistener () {

@Override

public void Onfocuschange (View V, Boolean hasfocus) {

TODO auto-generated Method Stub

if (Arr.size () >0) {

Arr.set (position, Edit.gettext (). toString ());

}

}

});

Del.setonclicklistener (New Onclicklistener () {

@Override

public void OnClick (View arg0) {

TODO auto-generated Method Stub

Deletes the contents of the EditText of the deleted item from the collection

Arr.remove (position);

Adapter.notifydatasetchanged ();

}

});

return view;

}

}

}