TUTORIAL MEMBUAT APLIKASI CRUD (CREATE, READ, UPDATE, DELETE) SEDERHANA DI ANDROID DENGAN DATABASE DI SERVER (PART 2)

Sebelumnya baca TUTORIAL MEMBUAT APLIKASI CRUD (CREATE, READ, UPDATE, DELETE) SEDERHANA DI ANDROID DENGAN DATABASE DI SERVER (PART 1)

Langkah 9

Sekarang kita lanjut untuk membuat kelas yang digunakan untuk mengupdate dan men-delete data mahasiswa. Idenya adalah ketika sebuah item mahasiswa dari list mahasiswa di-klik maka akan menuju activity untuk update/delete.

Kita buat dulu activity_updatedelete.xml, berikut isinya :

<?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:padding="10dp"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/id_mhs"
        android:visibility="gone"/> <!--untuk membuat textview tidak tampil-->

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Nama"
        android:id="@+id/textView" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editTextNama" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="NIM"
        android:id="@+id/textView2"
        android:layout_gravity="center_horizontal" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editTextNim"
        android:layout_gravity="center_horizontal" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_weight="1"
        >

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Update"
            android:layout_weight="0.5"
            android:id="@+id/buttonUpdate"/>

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Delete"
            android:layout_weight="0.5"
            android:id="@+id/buttonDelete" />
    </LinearLayout>
</LinearLayout>

Selanjutnya, kita buat kelas boundary-nya yaitu UpdateDeleteActivity.java, kelas ini dibuat extends ActionBarActivity, dan jangan lupa kita definisikan juga setiap TextView, Button, maupun EditText-nya. Berikut kodingnya :

package com.vhiefa.simplecrud;

import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

/**
 * Created by Afifatul on 6/18/2015.
 */
public class UpdateDeleteActivity extends ActionBarActivity {

    EditText EditTxtnama, EditTxtnim;
    TextView TxtViewId;
    Button UpdateBtn, DeleteBtn;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_updatedelete);

        EditTxtnama = (EditText) findViewById(R.id.editTextNama);
        EditTxtnim = (EditText) findViewById(R.id.editTextNim);
        TxtViewId = (TextView) findViewById(R.id.id_mhs);

        UpdateBtn = (Button) findViewById(R.id.buttonUpdate);
        DeleteBtn = (Button) findViewById(R.id.buttonDelete);

    }


}

Kita update AndroidManifest.xml agar kelas UpdateDeleteActivity bisa dipanggil di aplikasi android kita, tambahkan code berikut :

        <activity
            android:name="com.vhiefa.simplecrud.UpdateDeleteActivity"
            android:label="Detail Mahasiswa"
            android:parentActivityName="com.vhiefa.simplecrud.MainActivity" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.vhiefa.simplecrud.MainActivity" />
        </activity>

Sehingga koding di AndroidManifest.xml secara keseluruhan menjadi sebagai berikut :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.vhiefa.simplecrud" >

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.vhiefa.simplecrud.UpdateDeleteActivity"
            android:label="Detail Mahasiswa"
            android:parentActivityName="com.vhiefa.simplecrud.MainActivity" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.vhiefa.simplecrud.MainActivity" />
        </activity>
    </application>

</manifest>

Langkah 10

Kita update lagi koding di MainActivity.java, karena kita akan membuat agar list item mahasiswa ketika di-klik bisa menuju activity update/delete. Kita juga akan membuat id,nama, dan nim mahasiswa ter-parsing ke kelas UpdateDeleteActivity. Tambahkan koding berikut di dalam method onCreate :

        list.setOnItemClickListener(new AdapterView.OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int urutan, long id) {
                //dapatkan data id, nama, nim mahasiswa dan simpan dalam variable string
                String idmhs = ((TextView) view.findViewById(R.id.id_mhs)).getText().toString();
                String nama = ((TextView) view.findViewById(R.id.nama_mhs)).getText().toString();
                String nim = ((TextView) view.findViewById(R.id.nim_mhs)).getText().toString();

                //varible string tadi kita simpan dalam suatu Bundle, dan kita parse bundle tersebut bersama intent menuju kelas UpdateDeleteActivity
                Intent i = null;
                i = new Intent(MainActivity.this, UpdateDeleteActivity.class);
                Bundle b = new Bundle();
                b.putString("id_mhs", idmhs);
                b.putString("nama_mhs", nama);
                b.putString("nim_mhs", nim);
                i.putExtras(b);
                startActivity(i);
            }
        });

Sehingga seluruh koding di MainActivity.java menjadi :

package com.vhiefa.simplecrud;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;


public class MainActivity extends ActionBarActivity {

    ListView list;

    JSONParser jParser = new JSONParser();
    ArrayList<Mahasiswa> daftar_mhs = new ArrayList<Mahasiswa>();
    JSONArray daftarMhs = null;
    String url_read_mhs = "http://api.vhiefa.net76.net/simple_crud/read_mhs.php";
    // JSON Node names, ini harus sesuai yang di API
    public static final String TAG_SUCCESS = "success";
    public static final String TAG_MHS = "mahasiswa";
    public static final String TAG_ID_MHS = "id_mhs";
    public static final String TAG_NAMA_MHS = "nama";
    public static final String TAG_NIM_MHS = "nim";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        list = (ListView) findViewById(R.id.listview_mhs);

        //jalankan ReadMhsTask
        ReadMhsTask m= (ReadMhsTask) new ReadMhsTask().execute();

        list.setOnItemClickListener(new AdapterView.OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int urutan, long id) {
                //dapatkan data id, nama, nim mahasiswa dan simpan dalam variable string
                String idmhs = ((TextView) view.findViewById(R.id.id_mhs)).getText().toString();
                String nama = ((TextView) view.findViewById(R.id.nama_mhs)).getText().toString();
                String nim = ((TextView) view.findViewById(R.id.nim_mhs)).getText().toString();

                //varible string tadi kita simpan dalam suatu Bundle, dan kita parse bundle tersebut bersama intent menuju kelas UpdateDeleteActivity
                Intent i = null;
                i = new Intent(MainActivity.this, UpdateDeleteActivity.class);
                Bundle b = new Bundle();
                b.putString("id_mhs", idmhs);
                b.putString("nama_mhs", nama);
                b.putString("nim_mhs", nim);
                i.putExtras(b);
                startActivity(i);
            }
        });
    }


    class ReadMhsTask extends AsyncTask<String, Void, String>
    {
        ProgressDialog pDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Mohon Tunggu..");
            pDialog.setIndeterminate(true);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... sText) {
            String returnResult = getMhsList(); //memanggil method getMhsList()
            return returnResult;

        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            pDialog.dismiss();
            if(result.equalsIgnoreCase("Exception Caught"))
            {
                Toast.makeText(MainActivity.this, "Unable to connect to server,please check your internet connection!", Toast.LENGTH_LONG).show();
            }

            if(result.equalsIgnoreCase("no results"))
            {
                Toast.makeText(MainActivity.this, "Data empty", Toast.LENGTH_LONG).show();
            }
            else
            {
                list.setAdapter(new MahasiswaAdapter(MainActivity.this,daftar_mhs)); //Adapter menampilkan data mahasiswa ke dalam listView
            }
        }


        //method untuk memperoleh daftar mahasiswa dari JSON
        public String getMhsList()
        {
            Mahasiswa tempMhs = new Mahasiswa();
            List<NameValuePair> parameter = new ArrayList<NameValuePair>();
            try {
                JSONObject json = jParser.makeHttpRequest(url_read_mhs,"POST", parameter);

                int success = json.getInt(TAG_SUCCESS);
                if (success == 1) { //Ada record Data (SUCCESS = 1)
                    //Getting Array of daftar_mhs
                    daftarMhs = json.getJSONArray(TAG_MHS);
                    // looping through All daftar_mhs
                    for (int i = 0; i < daftarMhs.length() ; i++){
                        JSONObject c = daftarMhs.getJSONObject(i);
                        tempMhs = new Mahasiswa();
                        tempMhs.setMhsId(c.getString(TAG_ID_MHS));
                        tempMhs.setMhsName(c.getString(TAG_NAMA_MHS));
                        tempMhs.setMhsNIM(c.getString(TAG_NIM_MHS));
                        daftar_mhs.add(tempMhs);
                    }
                    return "OK";
                }
                else {
                    //Tidak Ada Record Data (SUCCESS = 0)
                    return "no results";
                }

            } catch (Exception e) {
                e.printStackTrace();
                return "Exception Caught";
            }
        }

    }
}

Langkah 11

Selanjutnya kita buka lagi UpdateDeleteActivity.java dan kita masukan kode yang menangkap bundle yang telah di-parsing dari kelas MainActivity tadi. Masukan code berikut :

        //menangkap bundle yang telah di-parsed dari MainActivity
        Bundle b = getIntent().getExtras();
        String isi_id_mhs = b.getString("id_mhs");
        String isi_nama_mhs= b.getString("nama_mhs");
        String isi_nim_mhs= b.getString("nim_mhs");
        //meng-set bundle tersebut
        EditTxtnama.setText(isi_nama_mhs);
        EditTxtnim.setText(isi_nim_mhs);
        TxtViewId.setText(isi_id_mhs);

Langkah 12

Kita buat AsyncTask di UpdateDeleteActivity untuk update data mahasiswa, kita beri nama UpdateMhsTask. Berikut kodingnya :

    class UpdateMhsTask extends AsyncTask<String, Void, String>
    {
        ProgressDialog pDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(UpdateDeleteActivity.this);
            pDialog.setMessage("Mohon Tunggu..");
            pDialog.setIndeterminate(true);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... sText) {

            List<NameValuePair> parameter = new ArrayList<NameValuePair>();
            parameter.add(new BasicNameValuePair(TAG_ID_MHS, idStr));
            parameter.add(new BasicNameValuePair(TAG_NAMA_MHS, namaStr));
            parameter.add(new BasicNameValuePair(TAG_NIM_MHS, nimStr));

            try {
                JSONObject json = jParser.makeHttpRequest(url_update_mhs,"POST", parameter);

                int success = json.getInt(TAG_SUCCESS);
                if (success == 1) {

                    return "OK";
                }
                else {

                    return "FAIL";

                }

            } catch (Exception e) {
                e.printStackTrace();
                return "Exception Caught";
            }

        }

        @Override
        protected void onPostExecute(String result) {

            super.onPostExecute(result);
            pDialog.dismiss();

            if(result.equalsIgnoreCase("Exception Caught"))
            {

                Toast.makeText(UpdateDeleteActivity.this, "Unable to connect to server,please check your internet connection!", Toast.LENGTH_LONG).show();
            }

            if(result.equalsIgnoreCase("FAIL"))
            {
                Toast.makeText(UpdateDeleteActivity.this, "Fail.. Try Again", Toast.LENGTH_LONG).show();
            }

            else {
                Intent i = null;
                i = new Intent(UpdateDeleteActivity.this, MainActivity.class);
                startActivity(i);
            }

        }
    }

Langkah 13 

Kita buat AsyncTask di UpdateDeleteActivity untuk delete data mahasiswa, kita beri nama DeleteMhsTask. Berikut kodingnya :

 class DeleteMhsTask extends AsyncTask<String, Void, String>
    {
        ProgressDialog pDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(UpdateDeleteActivity.this);
            pDialog.setMessage("Mohon Tunggu..");
            pDialog.setIndeterminate(true);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... sText) {

            List<NameValuePair> parameter = new ArrayList<NameValuePair>();
            parameter.add(new BasicNameValuePair(TAG_ID_MHS, idStr));

            try {
                JSONObject json = jParser.makeHttpRequest(url_delete_mhs,"POST", parameter);

                int success = json.getInt(TAG_SUCCESS);
                if (success == 1) {

                    return "OK";
                }
                else {

                    return "FAIL";

                }

            } catch (Exception e) {
                e.printStackTrace();
                return "Exception Caught";
            }

        }

        @Override
        protected void onPostExecute(String result) {

            super.onPostExecute(result);
            pDialog.dismiss();

            if(result.equalsIgnoreCase("Exception Caught"))
            {

                Toast.makeText(UpdateDeleteActivity.this, "Unable to connect to server,please check your internet connection!", Toast.LENGTH_LONG).show();
            }

            if(result.equalsIgnoreCase("FAIL"))
            {
                Toast.makeText(UpdateDeleteActivity.this, "Fail.. Try Again", Toast.LENGTH_LONG).show();
            }

            else {
                Intent i = null;
                i = new Intent(UpdateDeleteActivity.this, MainActivity.class);
                startActivity(i);
            }

        }
    }

Langkah 14

Kita buat agar button update dan button delete pada UpdateDeleteActivity bisa berfungsi sebagaimana mestinya. Tambahkan koding berikut :

        UpdateBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                idStr = TxtViewId.getText().toString();
                namaStr = EditTxtnama.getText().toString();
                nimStr = EditTxtnim.getText().toString();
                new UpdateMhsTask().execute();
            }
        });

        DeleteBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                idStr = TxtViewId.getText().toString();
                new DeleteMhsTask().execute();
            }
        });

Sehingga secara keseluruhan isi UpdateDeleteActivity.java adalah sebagai berikut :

package com.vhiefa.simplecrud;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;

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

/**
 * Created by Afifatul on 6/18/2015.
 */
public class UpdateDeleteActivity extends ActionBarActivity {

    JSONParser jParser = new JSONParser();
    String url_update_mhs= "http://api.vhiefa.net76.net/simple_crud/update_mhs.php";
    String url_delete_mhs= "http://api.vhiefa.net76.net/simple_crud/delete_mhs.php";
    // JSON Node names, ini harus sesuai yang di API
    public static final String TAG_SUCCESS = "success";
    public static final String TAG_ID_MHS = "id_mhs";
    public static final String TAG_NAMA_MHS = "nama";
    public static final String TAG_NIM_MHS = "nim";

    EditText EditTxtnama, EditTxtnim;
    TextView TxtViewId;
    Button UpdateBtn, DeleteBtn;
    String namaStr, nimStr, idStr;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_updatedelete);

        EditTxtnama = (EditText) findViewById(R.id.editTextNama);
        EditTxtnim = (EditText) findViewById(R.id.editTextNim);
        TxtViewId = (TextView) findViewById(R.id.id_mhs);

        UpdateBtn = (Button) findViewById(R.id.buttonUpdate);
        DeleteBtn = (Button) findViewById(R.id.buttonDelete);

        //menangkap bundle yang telah di-parsed dari MainActivity
        Bundle b = getIntent().getExtras();
        String isi_id_mhs = b.getString("id_mhs");
        String isi_nama_mhs= b.getString("nama_mhs");
        String isi_nim_mhs= b.getString("nim_mhs");
        //meng-set bundle tersebut
        EditTxtnama.setText(isi_nama_mhs);
        EditTxtnim.setText(isi_nim_mhs);
        TxtViewId.setText(isi_id_mhs);

        UpdateBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                idStr = TxtViewId.getText().toString();
                namaStr = EditTxtnama.getText().toString();
                nimStr = EditTxtnim.getText().toString();
                new UpdateMhsTask().execute();
            }
        });

        DeleteBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                idStr = TxtViewId.getText().toString();
                new DeleteMhsTask().execute();
            }
        });
    }

    class UpdateMhsTask extends AsyncTask<String, Void, String>
    {
        ProgressDialog pDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(UpdateDeleteActivity.this);
            pDialog.setMessage("Mohon Tunggu..");
            pDialog.setIndeterminate(true);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... sText) {

            List<NameValuePair> parameter = new ArrayList<NameValuePair>();
            parameter.add(new BasicNameValuePair(TAG_ID_MHS, idStr));
            parameter.add(new BasicNameValuePair(TAG_NAMA_MHS, namaStr));
            parameter.add(new BasicNameValuePair(TAG_NIM_MHS, nimStr));

            try {
                JSONObject json = jParser.makeHttpRequest(url_update_mhs,"POST", parameter);

                int success = json.getInt(TAG_SUCCESS);
                if (success == 1) {

                    return "OK";
                }
                else {

                    return "FAIL";

                }

            } catch (Exception e) {
                e.printStackTrace();
                return "Exception Caught";
            }

        }

        @Override
        protected void onPostExecute(String result) {

            super.onPostExecute(result);
            pDialog.dismiss();

            if(result.equalsIgnoreCase("Exception Caught"))
            {

                Toast.makeText(UpdateDeleteActivity.this, "Unable to connect to server,please check your internet connection!", Toast.LENGTH_LONG).show();
            }

            if(result.equalsIgnoreCase("FAIL"))
            {
                Toast.makeText(UpdateDeleteActivity.this, "Fail.. Try Again", Toast.LENGTH_LONG).show();
            }

            else {
                Intent i = null;
                i = new Intent(UpdateDeleteActivity.this, MainActivity.class);
                startActivity(i);
            }

        }
    }


    class DeleteMhsTask extends AsyncTask<String, Void, String>
    {
        ProgressDialog pDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(UpdateDeleteActivity.this);
            pDialog.setMessage("Mohon Tunggu..");
            pDialog.setIndeterminate(true);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... sText) {

            List<NameValuePair> parameter = new ArrayList<NameValuePair>();
            parameter.add(new BasicNameValuePair(TAG_ID_MHS, idStr));

            try {
                JSONObject json = jParser.makeHttpRequest(url_delete_mhs,"POST", parameter);

                int success = json.getInt(TAG_SUCCESS);
                if (success == 1) {

                    return "OK";
                }
                else {

                    return "FAIL";

                }

            } catch (Exception e) {
                e.printStackTrace();
                return "Exception Caught";
            }

        }

        @Override
        protected void onPostExecute(String result) {

            super.onPostExecute(result);
            pDialog.dismiss();

            if(result.equalsIgnoreCase("Exception Caught"))
            {

                Toast.makeText(UpdateDeleteActivity.this, "Unable to connect to server,please check your internet connection!", Toast.LENGTH_LONG).show();
            }

            if(result.equalsIgnoreCase("FAIL"))
            {
                Toast.makeText(UpdateDeleteActivity.this, "Fail.. Try Again", Toast.LENGTH_LONG).show();
            }

            else {
                Intent i = null;
                i = new Intent(UpdateDeleteActivity.this, MainActivity.class);
                startActivity(i);
            }

        }
    }
}

Selesai… Kita bisa jalankan aplikasi kita dan update dan delete juga bisa dilakukan.

Langkah 15

Sekarang kita lanjut agar aplikasi kita bisa menambah data mahasiswa ke database. Kita buat dulu activity_create.xml, berikut isinya :

<?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:padding="10dp"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Nama"
        android:id="@+id/textView" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editTextNama" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="NIM"
        android:id="@+id/textView2"
        android:layout_gravity="center_horizontal" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editTextNim"
        android:layout_gravity="center_horizontal" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Add"
        android:id="@+id/buttonAdd"
        android:layout_gravity="center_horizontal" />
</LinearLayout>

Selanjutnya, kita buat kelas boundary-nya yaitu CreateActivity.java, kelas ini dibuat extends ActionBarActivity, dan jangan lupa kita definisikan juga setiap TextView, Button, maupun EditText-nya. Berikut kodingnya :

package com.vhiefa.simplecrud;

import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;


/**
 * Created by Afifatul on 6/18/2015.
 */
public class CreateActivity extends ActionBarActivity{


    EditText EditTxtnama, EditTxtnim;
    Button addBtn;
    String namaStr, nimStr;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_create);

        EditTxtnama = (EditText) findViewById(R.id.editTextNama);
        EditTxtnim = (EditText) findViewById(R.id.editTextNim);
        addBtn = (Button) findViewById(R.id.buttonAdd);


    }

}

Kita update AndroidManifest.xml agar kelas CreateActivity bisa dipanggil di aplikasi android kita, tambahkan code berikut :

        <activity
            android:name="com.vhiefa.simplecrud.CreateActivity"
            android:label="Tambah Mahasiswa"
            android:parentActivityName="com.vhiefa.simplecrud.MainActivity" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.vhiefa.simplecrud.MainActivity" />
        </activity>

Sehingga koding di AndroidManifest.xml secara keseluruhan menjadi sebagai berikut :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.vhiefa.simplecrud" >

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.vhiefa.simplecrud.CreateActivity"
            android:label="Tambah Mahasiswa"
            android:parentActivityName="com.vhiefa.simplecrud.MainActivity" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.vhiefa.simplecrud.MainActivity" />
        </activity>
        <activity
            android:name="com.vhiefa.simplecrud.UpdateDeleteActivity"
            android:label="Detail Mahasiswa"
            android:parentActivityName="com.vhiefa.simplecrud.MainActivity" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.vhiefa.simplecrud.MainActivity" />
        </activity>
    </application>

</manifest>

Langkah 16

Kita buat agar di activity utama (MainActivity) dapat menampilkan tombol Add di pojok kanan action bar. Caranya kita update dulu main_menu.xml yang berada pada direktori menu. Berikut kodingnya :

<menu 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" tools:context=".MainActivity">

    <item android:id="@+id/action_add" android:title="Add"
        android:orderInCategory="100" app:showAsAction="always" />
</menu>

Kemudian kita tambahkan kode berikut pada MainActivity.java

    @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_main, 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();


        if (id == R.id.action_add) {
            Intent i = new Intent(MainActivity.this, CreateActivity.class);
            startActivity(i);
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

Sehingga secara keseluruhan isi MainActivity.java menjadi sebagai berikut :

package com.vhiefa.simplecrud;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;


public class MainActivity extends ActionBarActivity {

    ListView list;

    JSONParser jParser = new JSONParser();
    ArrayList<Mahasiswa> daftar_mhs = new ArrayList<Mahasiswa>();
    JSONArray daftarMhs = null;
    String url_read_mhs = "http://api.vhiefa.net76.net/simple_crud/read_mhs.php";
    // JSON Node names, ini harus sesuai yang di API
    public static final String TAG_SUCCESS = "success";
    public static final String TAG_MHS = "mahasiswa";
    public static final String TAG_ID_MHS = "id_mhs";
    public static final String TAG_NAMA_MHS = "nama";
    public static final String TAG_NIM_MHS = "nim";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        list = (ListView) findViewById(R.id.listview_mhs);

        //jalankan ReadMhsTask
        ReadMhsTask m= (ReadMhsTask) new ReadMhsTask().execute();

        list.setOnItemClickListener(new AdapterView.OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int urutan, long id) {
                //dapatkan data id, nama, nim mahasiswa dan simpan dalam variable string
                String idmhs = ((TextView) view.findViewById(R.id.id_mhs)).getText().toString();
                String nama = ((TextView) view.findViewById(R.id.nama_mhs)).getText().toString();
                String nim = ((TextView) view.findViewById(R.id.nim_mhs)).getText().toString();

                //varible string tadi kita simpan dalam suatu Bundle, dan kita parse bundle tersebut bersama intent menuju kelas UpdateDeleteActivity
                Intent i = null;
                i = new Intent(MainActivity.this, UpdateDeleteActivity.class);
                Bundle b = new Bundle();
                b.putString("id_mhs", idmhs);
                b.putString("nama_mhs", nama);
                b.putString("nim_mhs", nim);
                i.putExtras(b);
                startActivity(i);
            }
        });
    }


    @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_main, 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();


        if (id == R.id.action_add) {
            Intent i = new Intent(MainActivity.this, CreateActivity.class);
            startActivity(i);
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


    class ReadMhsTask extends AsyncTask<String, Void, String>
    {
        ProgressDialog pDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Mohon Tunggu..");
            pDialog.setIndeterminate(true);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... sText) {
            String returnResult = getMhsList(); //memanggil method getMhsList()
            return returnResult;

        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            pDialog.dismiss();
            if(result.equalsIgnoreCase("Exception Caught"))
            {
                Toast.makeText(MainActivity.this, "Unable to connect to server,please check your internet connection!", Toast.LENGTH_LONG).show();
            }

            if(result.equalsIgnoreCase("no results"))
            {
                Toast.makeText(MainActivity.this, "Data empty", Toast.LENGTH_LONG).show();
            }
            else
            {
                list.setAdapter(new MahasiswaAdapter(MainActivity.this,daftar_mhs)); //Adapter menampilkan data mahasiswa ke dalam listView
            }
        }


        //method untuk memperoleh daftar mahasiswa dari JSON
        public String getMhsList()
        {
            Mahasiswa tempMhs = new Mahasiswa();
            List<NameValuePair> parameter = new ArrayList<NameValuePair>();
            try {
                JSONObject json = jParser.makeHttpRequest(url_read_mhs,"POST", parameter);

                int success = json.getInt(TAG_SUCCESS);
                if (success == 1) { //Ada record Data (SUCCESS = 1)
                    //Getting Array of daftar_mhs
                    daftarMhs = json.getJSONArray(TAG_MHS);
                    // looping through All daftar_mhs
                    for (int i = 0; i < daftarMhs.length() ; i++){
                        JSONObject c = daftarMhs.getJSONObject(i);
                        tempMhs = new Mahasiswa();
                        tempMhs.setMhsId(c.getString(TAG_ID_MHS));
                        tempMhs.setMhsName(c.getString(TAG_NAMA_MHS));
                        tempMhs.setMhsNIM(c.getString(TAG_NIM_MHS));
                        daftar_mhs.add(tempMhs);
                    }
                    return "OK";
                }
                else {
                    //Tidak Ada Record Data (SUCCESS = 0)
                    return "no results";
                }

            } catch (Exception e) {
                e.printStackTrace();
                return "Exception Caught";
            }
        }

    }
}

Langkah 17

Sekarang kita buat AsyncTask di dalam CreateActivity.java untuk menambah data mahasiswa yang bernama CreateMhsTask, berikut kodingnya :

    class CreateMhsTask extends AsyncTask<String, String, String> {
        ProgressDialog dialog;
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            dialog = new ProgressDialog(CreateActivity.this);
            dialog.setMessage("Tambah Mahasiswa...");
            dialog.setIndeterminate(false);
            dialog.setCancelable(false);
            dialog.show();
        }

        protected String doInBackground(String... args) {

                // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();

                params.add(new BasicNameValuePair(TAG_NAMA_MHS, namaStr));
                params.add(new BasicNameValuePair(TAG_NIM_MHS, nimStr));

                // getting JSON Object
                // Note that create Post url accepts POST method
                JSONObject json = jsonParser.makeHttpRequest(url_create_mhs, "POST", params);

                // check for success tag
                try {
                    int success = json.getInt(TAG_SUCCESS);

                    if (success == 1) {
                        // closing this screen
                        finish();
                    } else {
                        return "gagal_database";
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                    return "gagal_koneksi_or_exception";
                }

            return "sukses";

        }


        protected void onPostExecute(String result) {

            super.onPostExecute(result);
            if (result.equalsIgnoreCase("gagal_database")){
                dialog.dismiss();
                Toast.makeText(CreateActivity.this, "Terjadi masalah! Silahkan cek koneksi Anda!", Toast.LENGTH_SHORT).show();
            }
            else if (result.equalsIgnoreCase("gagal_koneksi_or_exception")){
                dialog.dismiss();
                Toast.makeText(CreateActivity.this, "Terjadi masalah! Silahkan cek koneksi Anda!",  Toast.LENGTH_SHORT).show();

            }
            else if (result.equalsIgnoreCase("sukses")){
                dialog.dismiss();
                Intent i = null;
                i = new Intent(CreateActivity.this, MainActivity.class);
                startActivity(i);
            }
        }
    }

Langkah 18

Kita buat agar ketika button add pada CreateActivity bisa berfungsi sebagaimana mestinya. Tambahkan kode berikut :

        addBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                namaStr = EditTxtnama.getText().toString();
                nimStr = EditTxtnim.getText().toString();
                new CreateMhsTask().execute();
            }
        });

Sehingga isi CreateActivity.java secara keseluruhan adalah sebagai berikut :

package com.vhiefa.simplecrud;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

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

/**
 * Created by Afifatul on 6/18/2015.
 */
public class CreateActivity extends ActionBarActivity{

    JSONParser jsonParser = new JSONParser();
    String url_create_mhs= "http://api.vhiefa.net76.net/simple_crud/create_mhs.php";
    // JSON Node names, ini harus sesuai yang di API
    public static final String TAG_SUCCESS = "success";
    public static final String TAG_NAMA_MHS = "nama";
    public static final String TAG_NIM_MHS = "nim";

    EditText EditTxtnama, EditTxtnim;
    Button addBtn;
    String namaStr, nimStr;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_create);

        EditTxtnama = (EditText) findViewById(R.id.editTextNama);
        EditTxtnim = (EditText) findViewById(R.id.editTextNim);
        addBtn = (Button) findViewById(R.id.buttonAdd);


        addBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                namaStr = EditTxtnama.getText().toString();
                nimStr = EditTxtnim.getText().toString();
                new CreateMhsTask().execute();
            }
        });
    }


    class CreateMhsTask extends AsyncTask<String, String, String> {
        ProgressDialog dialog;
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            dialog = new ProgressDialog(CreateActivity.this);
            dialog.setMessage("Tambah Mahasiswa...");
            dialog.setIndeterminate(false);
            dialog.setCancelable(false);
            dialog.show();
        }

        protected String doInBackground(String... args) {

                // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();

                params.add(new BasicNameValuePair(TAG_NAMA_MHS, namaStr));
                params.add(new BasicNameValuePair(TAG_NIM_MHS, nimStr));

                // getting JSON Object
                // Note that create Post url accepts POST method
                JSONObject json = jsonParser.makeHttpRequest(url_create_mhs, "POST", params);

                // check for success tag
                try {
                    int success = json.getInt(TAG_SUCCESS);

                    if (success == 1) {
                        // closing this screen
                        finish();
                    } else {
                        return "gagal_database";
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                    return "gagal_koneksi_or_exception";
                }

            return "sukses";

        }


        protected void onPostExecute(String result) {

            super.onPostExecute(result);
            if (result.equalsIgnoreCase("gagal_database")){
                dialog.dismiss();
                Toast.makeText(CreateActivity.this, "Terjadi masalah! Silahkan cek koneksi Anda!", Toast.LENGTH_SHORT).show();
            }
            else if (result.equalsIgnoreCase("gagal_koneksi_or_exception")){
                dialog.dismiss();
                Toast.makeText(CreateActivity.this, "Terjadi masalah! Silahkan cek koneksi Anda!",  Toast.LENGTH_SHORT).show();

            }
            else if (result.equalsIgnoreCase("sukses")){
                dialog.dismiss();
                Intent i = null;
                i = new Intent(CreateActivity.this, MainActivity.class);
                startActivity(i);
            }
        }
    }
}

Selesai!!! Sekarang aplikasi kita bisa dijalankan. 

Code lengkap dan apk-nya bisa didownload  DI SINI

Sekian terimakasih.. I know that I am not that expert, but I just wanna share a little thing that I know. Correct me if I’m wrong. Cheers!

Kalo ada yang kurang jelas atau mau bertanya, langsung saja tinggalkan komentar :)