Beginners street: Android ListView example with code

Hello Everyone,

This post will take you through a complete code snippet for android listview with text using adapter class. Initially all the java files and xml files are listed in this post for your convenience . Then separate code snippet is given for each file.

so let's start this tutorial with list of files.

Java Files

DisplayProject.java
adminProjectList.java
DisplayProjectAdapter.java
JSONParser.java

XML Files

Activity_display_project.xml
Admin_display_project_listitems.xml

MainActivity : DisplayProject.java

package com.hrm.admin.project;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import com.hrm.adapter.DisplayProjectAdapter;
import com.hrm.items.adminProjectList;
import com.hrm.servicehandler.JSONParser;
import com.hrm.uspl10.hrm.R;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class DisplayProject extends AppCompatActivity implements AdapterView.OnItemClickListener {

    private ProgressDialog pDialog;
    ListView listview_project;
    JSONObject json;
    JSONParser JParser = new JSONParser();
    JSONArray JArray = null;
    ArrayList> projectList;
    private List apl_items;

    String pId;

    private static String ProjectDisplayURL = "http://10.0.2.2/load_project_status.php";
    private static final String TAG_SUCCESS = "success";
    private static final String TAG_TABLE = "hrm_project";
    private static final String TAG_PID = "pid";
    private static final String TAG_PNAME = "pname";
    private static final String TAG_PSTATUS = "pstatus";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }
        setContentView(R.layout.activity_display_project);
        apl_items = new ArrayList();
        projectList = new ArrayList>();
        listview_project = (ListView)findViewById(R.id.displayProjectListview);
        new getAsyncTaskforProjectDisplay().execute();
        listview_project.setOnItemClickListener(this);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_display_project, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private class getAsyncTaskforProjectDisplay extends AsyncTask {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(DisplayProject.this);
            pDialog.setMessage("Loading Please Wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.setCanceledOnTouchOutside(true);
            pDialog.show();

        }
        @Override
        protected JSONObject doInBackground(String... params) {
            try{

                json = JParser.makeHttpRequest1(ProjectDisplayURL, "GET");

                // Check your log cat for JSON reponse
                Log.d("Inbox JSON: ", json.toString());

            }catch(Exception e){
                e.printStackTrace();
            }

            return json;

        }

        @Override
        protected void onPostExecute(JSONObject jsonObject) {
            super.onPostExecute(jsonObject);
            pDialog.dismiss();
            if (json != null) {
                try{
                    JArray=json.getJSONArray(TAG_TABLE);
                    for(int i=0;i<JArray.length();i++){

                        JSONObject jobject=JArray.getJSONObject(i);
                        adminProjectList listitems=new adminProjectList();

                        pId=jobject.getString(TAG_PID);
                        String pName=jobject.getString(TAG_PNAME);
                        String pStatus=jobject.getString(TAG_PSTATUS);

                        listitems.setProjectName(pName);
                        listitems.setProjectStatus(pStatus);

                        apl_items.add(listitems);
                    }

                   DisplayProjectAdapter sadapter=new DisplayProjectAdapter(DisplayProject.this,apl_items);
                    listview_project.setAdapter(sadapter);

                }catch(JSONException e){
                    e.printStackTrace();
                }
            }

        }

    }

project list : adminProjectList.java

package com.hrm.items;

public class adminProjectList {

    private String projectId,projectName,projectStatus;
    public adminProjectList(){

   }

    public String getProjectId(){
    return projectId;
    }

    public void setProjectId(String projectId){
    this.projectId=projectId;
    }


   public String getProjectName(){
   return projectName;
   }


   public void setProjectName(String projectName){
   this.projectName=projectName;
   }

    public String getProjectStatus(){
    return projectStatus;
   }

    public void setProjectStatus(String projectStatus){
    this.projectStatus=projectStatus;
    }

}

Adapter class: DisplayProjectAdapter.java

package com.hrm.adapter;


import android.app.Activity;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.widget.BaseAdapter;import android.widget.TextView;import com.hrm.items.adminProjectList;import com.hrm.uspl10.hrm.R;import java.util.List;

public class DisplayProjectAdapter extends BaseAdapter {

    private Activity activity;
    private LayoutInflater inflater;
    private List projectlist;

    public DisplayProjectAdapter(Activity activity, List apList){
        this.activity = activity;
        this.projectlist = apList;

    }

    @Override

    public int getCount() {
    return projectlist.size();
    }

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


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



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

        if(inflater==null){

            inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        }

        if(convertView==null){

            convertView = inflater.inflate(R.layout.admin_display_project_listitem,null);

        }

        Animation slideUp = AnimationUtils.loadAnimation(activity, R.anim.slide_up);

        TextView pname=(TextView)convertView.findViewById(R.id.adminDisplayproject_pName);
        TextView pstatus = (TextView)convertView.findViewById(R.id.adminDisplayproject_pStatus);

        adminProjectList alist=projectlist.get(position);

        pname.setText(alist.getProjectName());
        pstatus.setText(alist.getProjectStatus());


        slideUp.setDuration(500);
        convertView.startAnimation(slideUp);
        slideUp = null;

        return convertView;

    }

}




JsonParser : JSONParser.java


package com.hrm.servicehandler;


import android.util.Log;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.client.utils.URLEncodedUtils;import org.apache.http.impl.client.DefaultHttpClient;import org.json.JSONException;import org.json.JSONObject;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.util.List;


public class JSONParser {

    static InputStream is = null;

    static JSONObject jObj = null;

    static String json = "";

    // constructor

    public JSONParser() {



    }

    public JSONObject makeHttpRequest1(String url, String method) {



        // Making HTTP request

        try {



            // check for request method

            if (method == "POST") {

                // request method is POST

                // defaultHttpClient

                DefaultHttpClient httpClient = new DefaultHttpClient();

                HttpPost httpPost = new HttpPost(url);

                // httpPost.setEntity(new UrlEncodedFormEntity(params));



                HttpResponse httpResponse = httpClient.execute(httpPost);

                HttpEntity httpEntity = httpResponse.getEntity();

                is = httpEntity.getContent();



            } else if (method == "GET") {

                // request method is GET

                DefaultHttpClient httpClient = new DefaultHttpClient();

                // String paramString = URLEncodedUtils.format(params, "utf-8");

                // url += "?" + paramString;

                HttpGet httpGet = new HttpGet(url);



                HttpResponse httpResponse = httpClient.execute(httpGet);

                HttpEntity httpEntity = httpResponse.getEntity();

                is = httpEntity.getContent();

            }



        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        } catch (ClientProtocolException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

        try {

            BufferedReader reader = new BufferedReader(new InputStreamReader(

                    is, "iso-8859-1"), 8);

            StringBuilder sb = new StringBuilder();

            String line = null;

            while ((line = reader.readLine()) != null) {

                sb.append(line + "\n");

            }

            is.close();

            json = sb.toString();

        } catch (Exception e) {

            Log.e("Buffer Error", "Error converting result " + e.toString());

        }



        // try parse the string to a JSON object

        try {

            jObj = new JSONObject(json);

        } catch (JSONException e) {

            Log.e("JSON Parser", "Error parsing data " + e.toString());

        }



        // return JSON String

        return jObj;



    }

    public String makeHttpRequest2(String url, String method) {



        // Making HTTP request

        try {



            // check for request method

            if (method == "POST") {

                // request method is POST

                // defaultHttpClient

                DefaultHttpClient httpClient = new DefaultHttpClient();

                HttpPost httpPost = new HttpPost(url);

                // httpPost.setEntity(new UrlEncodedFormEntity(params));



                HttpResponse httpResponse = httpClient.execute(httpPost);

                HttpEntity httpEntity = httpResponse.getEntity();

                is = httpEntity.getContent();



            } else if (method == "GET") {

                // request method is GET

                DefaultHttpClient httpClient = new DefaultHttpClient();

                // String paramString = URLEncodedUtils.format(params, "utf-8");

                // url += "?" + paramString;

                HttpGet httpGet = new HttpGet(url);



                HttpResponse httpResponse = httpClient.execute(httpGet);

                HttpEntity httpEntity = httpResponse.getEntity();

                is = httpEntity.getContent();

            }



        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        } catch (ClientProtocolException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

        try {

            BufferedReader reader = new BufferedReader(new InputStreamReader(

                    is, "iso-8859-1"), 8);

            StringBuilder sb = new StringBuilder();

            String line = null;

            while ((line = reader.readLine()) != null) {

                sb.append(line + "\n");

            }

            is.close();

            json = sb.toString();

        } catch (Exception e) {

            Log.e("Buffer Error", "Error converting result " + e.toString());

        }



        // try parse the string to a JSON object

        try {

            jObj = new JSONObject(json);

        } catch (JSONException e) {

            Log.e("JSON Parser", "Error parsing data " + e.toString());

        }



        // return JSON String

        return json;



    }



    public JSONObject makeHttpRequest(String url, String method, List params) {

        try {



            // check for request method

            if(method == "POST"){

                // request method is POST

                // defaultHttpClient



                DefaultHttpClient httpClient = new DefaultHttpClient();

                HttpPost httpPost = new HttpPost(url);

                httpPost.setEntity(new UrlEncodedFormEntity(params));



                HttpResponse httpResponse = httpClient.execute(httpPost);

                HttpEntity httpEntity = httpResponse.getEntity();

                is = httpEntity.getContent();



            }else if(method == "GET"){

                // request method is GET

                DefaultHttpClient httpClient = new DefaultHttpClient();

                String paramString = URLEncodedUtils.format(params, "utf-8");

                url += "?" + paramString;

                HttpGet httpGet = new HttpGet(url);



                HttpResponse httpResponse = httpClient.execute(httpGet);

                HttpEntity httpEntity = httpResponse.getEntity();

                is = httpEntity.getContent();

            }



        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        } catch (ClientProtocolException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }



        return jObj;

    }

}



XML Files: 
 
Main Activity xml : activity_display_project.xml
 
<RelativeLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:paddingBottom="@dimen/activity_vertical_margin"

    tools:context="com.hrm.admin.project.DisplayProject">



    TextView android:text="@string/hello_world" android:layout_width="wrap_content"

        android:layout_height="wrap_content" />



    <ListView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/displayProjectListview"

        android:layout_alignParentTop="true"

        android:layout_alignParentLeft="true"

        android:layout_alignParentStart="true" />

</RelativeLayout>
 
 
Project details list : admin_display_project_listitem.xml
 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"



    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">





    <TableLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content">



        <TableRow

            android:layout_height="wrap_content"

            android:layout_weight="1">



            <TextView

                android:id="@+id/adminDisplayproject_pName"

                android:layout_width="wrap_content"

                android:layout_height="match_parent"

                android:layout_weight="0.65"

                android:text="Medium Text"

                android:textAppearance="?android:attr/textAppearanceMedium" />



            <TextView

                android:id="@+id/adminDisplayproject_pStatus"

                android:layout_width="wrap_content"

                android:layout_height="match_parent"

                android:layout_gravity="center_vertical"

                android:layout_weight="0.35"

                android:text="Medium Text"

                android:textAppearance="?android:attr/textAppearanceMedium" />

        </TableRow>

    </TableLayout>



</RelativeLayout>
 
 
Finally MANIFEST file: AndroidManifest.xml
 
xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.hrm.uspl10.hrm">



    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

    <uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY" />

    <uses-permission android:name="android.permission.BLUETOOTH" />

    <uses-permission android:name="android.permission.INTERNET" />



    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme">

        <activity

            android:name="com.hrm.admin.project.DisplayProject"



            android:label="@string/app_name"

            android:theme="@style/Theme.AppCompat.Light.NoActionBar">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />



                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>



</manifest>
 
Then define the respective strings, dimensions and color in the 
·         /res/values/Strings.xml
·         /res/values/Dimens.xml
·         /res/values/Colors.xml
 
Database creation:
 
Create a database in your localhost and name it “hrm”(or whatever you want).
Then create a table and name it “hrm_project”(or whatever you want, remember if you change table and database name then apply these changes in the java file also(DisplayProject.java).
 
Create fields:
·         Pid
·         Pname
·         Cname 
·         Tech
·         Sd
·         Ed
·         Duration
·         Cost
·         Sid
·         Status
 
Then after creating the table, insert the values into the table.
 
Now run the android code using the android emulator.
 
Thank you.

Beginners street

Tuesday, December 08, 2015

Android ListView example with code

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