Skip to main content

Listview Widget in Android?

 ListView Widget in Android?

.....................................................................................................................................


It is used to display items using List form, List-display multiple rows, we can customize List Widget using CustomAdapter class.

Syntax of ListView Widget in Android:-


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".MainActivity17">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/lstview2"
        >

    </ListView>

</LinearLayout>


Example 1st:-

Create Normal ListView in Android Application:-

1) Create Activity and provide name Activity17

package com.example.additionapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity17 extends AppCompatActivity {

    ListView lstv;
    String arr[] = {"C","C++","JAVA",".NET","PHP","ANDROID","iOS","Data Science","MACHINE Learning","C","C++","JAVA",".NET","PHP","ANDROID","iOS","Data Science","MACHINE Learning"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main17);
        lstv = findViewById(R.id.lstview2);
        ArrayAdapter aa = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1,arr);
        lstv.setAdapter(aa);
        lstv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(getApplicationContext(),"Selected Course is "+arr[position],Toast.LENGTH_LONG).show();
            }
        });


    }
}


2) <?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".MainActivity17">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/lstview2"
        >

    </ListView>

</LinearLayout>



Custom ListView:-


1)  Create Activity and Design ListView:-

package com.example.additionapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity17 extends AppCompatActivity {

    ListView lstv;
    int imgid[] = {R.drawable.bg,R.drawable.sss};
    String str[] = {"RAMESH","SURESH"};
   // String arr[] = {"C","C++","JAVA",".NET","PHP","ANDROID","iOS","Data Science","MACHINE Learning","C","C++","JAVA",".NET","PHP","ANDROID","iOS","Data Science","MACHINE Learning"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main17);
        lstv = findViewById(R.id.lstview2);
      //  ArrayAdapter aa = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1,arr);
       // lstv.setAdapter(aa);
        StuAdapter obj = new StuAdapter(getApplication(),imgid,str);
        lstv.setAdapter(obj);
        lstv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(getApplicationContext(),"Selected Course is "+str[position],Toast.LENGTH_LONG).show();
            }
        });


    }
}

2)  Design File:-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".MainActivity17">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/lstview2"
        >

    </ListView>

</LinearLayout>

3)  Custom LisvIew:-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:layout_height="match_parent">

    <ImageView
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:id="@+id/custimgview"
        >

    </ImageView>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/custtextview"
        ></TextView>

</LinearLayout>


4)  Adpate class:-
package com.example.additionapplication;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;



public class StuAdapter extends BaseAdapter {
    int imgid[];
    String sname[];
    Context ctx;
    LayoutInflater inflter;
    StuAdapter(Context ctx,int imgid[],String sname[])
    {
        this.imgid = imgid;
        this.sname=sname;
        this.ctx =ctx;
        inflter = (LayoutInflater.from(ctx));
    }
    @Override
    public int getCount() {
        return sname.length;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View row = inflter.inflate(R.layout.custspinner_layout, parent, false);
        ImageView img = (ImageView) row.findViewById(R.id.custimgview);
        img.setImageResource(imgid[position]);
        TextView label = (TextView) row.findViewById(R.id.custtextview);
        label.setText(sname[position]);
        return row;
    }
}





Labels:

Comments

Post a Comment

POST Answer of Questions and ASK to Doubt

Popular posts from this blog

Uncontrolled form input in React-JS

  Uncontrolled form input in React-JS? If we want to take input from users without any separate event handling then we can uncontrolled the data binding technique. The uncontrolled input is similar to the traditional HTML form inputs. The DOM itself handles the form data. Here, the HTML elements maintain their own state that will be updated when the input value changes. To write an uncontrolled component, you need to use a ref to get form values from the DOM. In other words, there is no need to write an event handler for every state update. You can use a ref to access the input field value of the form from the DOM. Example of Uncontrolled Form Input:- import React from "react" ; export class Info extends React . Component {     constructor ( props )     {         super ( props );         this . fun = this . fun . bind ( this ); //event method binding         this . input = React . createRef ();...
Post a Comment
Read more

JSP Page design using Internal CSS

  JSP is used to design the user interface of an application, CSS is used to provide set of properties. Jsp provide proper page template to create user interface of dynamic web application. We can write CSS using three different ways 1)  inline CSS:-   we will write CSS tag under HTML elements <div style="width:200px; height:100px; background-color:green;"></div> 2)  Internal CSS:-  we will write CSS under <style> block. <style type="text/css"> #abc { width:200px;  height:100px;  background-color:green; } </style> <div id="abc"></div> 3) External CSS:-  we will write CSS to create a separate file and link it into HTML Web pages. create a separate file and named it style.css #abc { width:200px;  height:100px;  background-color:green; } go into Jsp page and link style.css <link href="style.css"  type="text/css" rel="stylesheet"   /> <div id="abc"> </div> Exam...
Post a Comment
Read more

JDBC Database Connectivity using JSP and Servlet, Database connectivity on Java

JDBC Database Connectivity using JSP and Servlet, Database connectivity on Java JDBC:-   JDBC means Java database connectivity, it is used to connect from the front-end(application server) to the back-end(database server) in the case of Java web application. The database provides a set of tables to store records and JDBC will work similarly to the  bridge between the database table and application form. 1)  Class.forName("drivername")  // Manage Drive         Class.formName("com.mysql.jdbc.Driver");  // MYSQL      Class.forName ("oracle.jdbc.driver.OracleDriver"); //Oracle 2)  Manage Connection String     It establish connection from application server to database server, Java provide DriverManage class and getConnection that will return Connection object.    Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/databasename","username","password"); 3)  Manage Statement to...
4 comments
Read more