Android Custom ListView – LongClick Events

This is an android tutorial to explore how to handle longclick events in a custom listview with images and text.

Let’s go.

1. Create Basic Activity Project

1. First create a new project in android studio. Go to File –> New Project.
2. Type the application name and choose the company name.
3. Choose minimum SDK.
4. Choose Basic activity.
5. Click Finish.

Basic activity will have a toolbar and floating action button already added in the layout

Normally two layouts get generated with this option:

In this example I used a basic activity.

The activity will automatically be registered in the android_manifest.xml. Android Activities are components and normally need to be registered as an application component.

If you’ve created yours manually then register it inside the <application>...<application> as following, replacing the MainActivity with your activity name:

        <activity android_name=".MainActivity">

            <intent-filter>

                <action android_name="android.intent.action.MAIN" />

                <category android_name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

You can see that one action and category are specified as intent filters. The category makes our MainActivity as launcher activity. Launcher activities get executed first when th android app is run.

Advantage of Creating Basic Activity project

You can optionally choose empty activity over basic activity for this project.

However basic activity has the following advantages:

Generated Project Structure

AndroidStudio will generate for you a project with default configurations via a set of files and directories.

Here are the most important of them:

2. Dependencies

We really have no external dependencies. Instead we simply specify a couple of support library dependencies.

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.2.1'
    compile 'com.android.support:design:23.2.1'
    compile 'com.android.support:cardview-v7:23.2.1'
}

3. Create User Interface

User interfaces are typically created in android using XML layouts as opposed by direct java coding.

This is an example fo declarative programming.

Advantages of Using XML over Java

Here are our layouts for this project:

(a). activity_main.xml

• This layout gets inflated to MainActivity user interface.
• It includes the content_main.xml.

Here are some of the widgets, views and viewgroups that get employed”

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
    
    
    android_layout_width="match_parent"
    android_layout_height="match_parent"
    android_fitsSystemWindows="true"
    tools_context="com.tutorials.hp.listviewlongclick.MainActivity">

    <android.support.design.widget.AppBarLayout
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android_id="@+id/toolbar"
            android_layout_width="match_parent"
            android_layout_height="?attr/actionBarSize"
            android_background="?attr/colorPrimary"
            app_popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />

    <android.support.design.widget.FloatingActionButton
        android_id="@+id/fab"
        android_layout_width="wrap_content"
        android_layout_height="wrap_content"
        android_layout_gravity="bottom|end"
        android_layout_margin="@dimen/fab_margin"
        android_src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

(b). content_main.xml

Let’s add our ListView here.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    
    
    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.tutorials.hp.listviewlongclick.MainActivity"
    tools_showIn="@layout/activity_main">

    <ListView
        android_layout_width="wrap_content"
        android_layout_height="wrap_content"
        android_id="@+id/lv"
        android_layout_alignParentLeft="true"
        android_layout_alignParentStart="true" />
</RelativeLayout>

(c). model.xml

This layout will define the custom row model for our ListView.

In this case our ListView will have images and text.

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 
    android_orientation="horizontal" android_layout_width="match_parent"
    
    android_layout_margin="10dp"
    card_view_cardCornerRadius="10dp"
    card_view_cardElevation="10dp"

    android_layout_height="wrap_content">

    <RelativeLayout
        android_layout_width="match_parent"
        android_layout_height="match_parent">

        <ImageView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_id="@+id/movieImage"
            android_padding="10dp"
            android_src="@drawable/ghost" />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceLarge"
            android_text="Name"
            android_id="@+id/nameTxt"
            android_padding="10dp"
            android_textColor="@color/colorAccent"
            android_layout_below="@+id/movieImage"
            android_layout_alignParentLeft="true"
             />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceLarge"
            android_text=" John Doe a former FBI Agent and now Physics teacher .is wrongly accussed of murdering an innocent child.He makes it his business to find the bad guys who did taht.He convinces hacker Aram to join him.....
            "
            android_id="@+id/descTxt"
            android_padding="10dp"
            android_layout_below="@+id/nameTxt"
            android_layout_alignParentLeft="true"
            />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceMedium"
            android_text="TV Show"
            android_id="@+id/posTxt"
            android_padding="10dp"

            android_layout_below="@+id/movieImage"
            android_layout_alignParentRight="true" />

        <CheckBox
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_id="@+id/chk"
            android_layout_alignParentRight="true"
            />

    </RelativeLayout>
</android.support.v7.widget.CardView>

Let’s now come to our Java classes:

4. Movie.java

Our data object.

package com.tutorials.hp.listviewlongclick;

public class Movie {

    private String name;
    private int image;

    public Movie(String name, int image) {
        this.name = name;
        this.image = image;
    }

    public String getName() {
        return name;
    }

    public int getImage() {
        return image;
    }
}

5. ItemLongClickListener.java

Our long click listener interface.

package com.tutorials.hp.listviewlongclick;

import android.view.View;

public interface ItemLongClickListener {

    void onLongItemClick(View v);

}

6. MyViewHolder.java

Will hold our widgets to be recycled.

package com.tutorials.hp.listviewlongclick;

import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

public class MyViewHolder implements View.OnLongClickListener {

    ImageView img;
    TextView nameTxt;
    ItemLongClickListener itemLongClickListener;

    public MyViewHolder(View v) {
        img= (ImageView) v.findViewById(R.id.movieImage);
        nameTxt= (TextView) v.findViewById(R.id.nameTxt);

        v.setOnLongClickListener(this);

    }

    public void setItemLongClickListener(ItemLongClickListener ic)
    {
        this.itemLongClickListener=ic;
    }

    @Override
    public boolean onLongClick(View v) {
        this.itemLongClickListener.onLongItemClick(v);
        return false;
    }
}

7. CustomAdapter.java

Will inflate our model.xml and bind data to resultant views.

package com.tutorials.hp.listviewlongclick;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Toast;

import java.util.ArrayList;

public class CustomAdapter extends BaseAdapter {

    Context c;
    ArrayList<Movie> movies;
    LayoutInflater inflater;

    public CustomAdapter(Context c, ArrayList<Movie> movies) {
        this.c = c;
        this.movies = movies;
    }

    @Override
    public int getCount() {
        return movies.size();
    }

    @Override
    public Object getItem(int position) {
        return movies.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    //SHALL RETURN A ROW
    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {

        if(inflater==null)
        {
            inflater= (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        //CONVERT FROM XML TO JAVA
        if(convertView==null)
        {
            convertView=inflater.inflate(R.layout.model,parent,false);
        }

        //BIND DATA TO VIEWS
        MyViewHolder holder=new MyViewHolder(convertView);
        holder.nameTxt.setText(movies.get(position).getName());
        holder.img.setImageResource(movies.get(position).getImage());

        holder.setItemLongClickListener(new ItemLongClickListener() {
            @Override
            public void onLongItemClick(View v) {
                Toast.makeText(c,movies.get(position).getName(),Toast.LENGTH_SHORT).show();
            }
        });

        return convertView;
    }
}

8. MainActivity.java

Our Main activity.

package com.tutorials.hp.listviewlongclick;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.View;

import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    ListView lv;
    CustomAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

        lv= (ListView) findViewById(R.id.lv);
        adapter=new CustomAdapter(this,getMovies());

        //SET ADAPTER
        lv.setAdapter(adapter);

    }

    private ArrayList<Movie> getMovies() {

        //COLECTION OF CRIME MOVIES
        ArrayList<Movie> movies=new ArrayList<>();

        Movie movie=new Movie("Shuttle Carrier",R.drawable.shuttlecarrier);

        //ADD ITR TO COLLECTION
        movies.add(movie);

        movie=new Movie("Fruts",R.drawable.fruits);
        movies.add(movie);

        movie=new Movie("Breaking Bad",R.drawable.breaking);
        movies.add(movie);

        movie=new Movie("Crisis",R.drawable.crisis);
        movies.add(movie);

        movie=new Movie("Ghost Rider",R.drawable.rider);
        movies.add(movie);

        movie=new Movie("Star Wars",R.drawable.starwars);
        movies.add(movie);

        movie=new Movie("BlackList",R.drawable.red);
        movies.add(movie);

        movie=new Movie("Men In Black",R.drawable.meninblack);
        movies.add(movie);

        movie=new Movie("Game Of Thrones",R.drawable.thrones);
        movies.add(movie);

        return movies;
    }

}

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Best Regards,
Oclemy.