Android Lesson 12 part 2: ListFragment


Example 2: ListFragment

File res/layout/list_fragment.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">

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <TextView
        android:id="@android:id/empty"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Empty Listview" />
</LinearLayout>

File ListFragment.java

package com.example.fragment;

import android.app.AlertDialog;
import android.app.ListFragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Toast;

import androidx.annotation.Nullable;

import java.util.List;
import java.util.ArrayList;

public class ListFragment1 extends ListFragment implements AdapterView.OnItemClickListener{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.list_fragment, container, false);
        return view;
    }

    ArrayAdapter<String> adapter;
    List<String> cities = new ArrayList<String>();

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        cities.add("BangKok");
        cities.add("HaNoi");
        cities.add("Jakarta");

        adapter = new ArrayAdapter<String>(getActivity(),
            android.R.layout.simple_list_item_1, cities);
        setListAdapter(adapter);
        getListView().setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(getActivity(), "Item: " + position, Toast.LENGTH_LONG).show();

        AlertDialog.Builder adb= new AlertDialog.Builder(getActivity());
        adb.setTitle("Delete?");
        adb.setMessage("Are you sure you want to delete " + cities.get(position));
        adb.setNegativeButton("Cancel", null);
        adb.setPositiveButton("Ok", new AlertDialog.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                cities.remove(position);
                adapter.notifyDataSetChanged();
            }});
        adb.show();

    }
}

File res/layout/acivity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.widget.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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:text="TUTORIALSPOTS.COM" />
     
    <fragment
        android:name="com.example.fragment.ListFragment1"
        android:id="@+id/fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/text" />

</android.widget.RelativeLayout>

File MainActivity.java

package com.example.fragment;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
          
    }
}

ListFragment

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