Android CRUD Tutorial | • RETROFIT • PHP • MYSQL (https://youtu.be/Vh92eSAEu5c)

activity_editor.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView 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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".activity.editor.EditorActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginTop="20dp">

        <EditText
            android:id="@+id/title"
            android:hint="@string/to_do"
            android:textSize="25sp"
            android:inputType="textCapSentences"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            tools:ignore="Autofill" />

        <EditText
            android:id="@+id/note"
            android:layout_below="@id/title"
            android:hint="@string/enter_note"
            android:inputType="textMultiLine"
            android:minLines="6"
            android:gravity="top|start"
            android:layout_marginTop="20dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            tools:ignore="Autofill" />

        <com.thebluealliance.spectrum.SpectrumPalette
            android:id="@+id/palette"
            android:layout_below="@id/note"
            android:layout_marginTop="20dp"
            android:layout_marginBottom="20dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:spectrum_colors="@array/demo_colors"/>

    </RelativeLayout>

</android.support.v4.widget.NestedScrollView>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    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"
    tools:context=".activity.main.MainActivity">

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe_refresh"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

    </android.support.v4.widget.SwipeRefreshLayout>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/add"
        android:layout_margin="16dp"
        android:layout_gravity="bottom|end"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_add"/>

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

ApiClient.java

import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class ApiClient {

    private static final String BASE_URL = "http://your-domain-name.000webhostapp.com/";
    private static Retrofit retrofit;

    public static Retrofit getApiClient() {

        if (retrofit == null) {
            retrofit = new Retrofit.Builder()
                    .baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }

        return retrofit;
    }

}

ApiInterfce.java

import com.haerulmuttaqin.mynotesapp.model.Note;

import java.util.List;

import retrofit2.Call;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.GET;
import retrofit2.http.POST;

public interface ApiInterface {

    @FormUrlEncoded
    @POST("save.php")
    Call<Note> saveNote(
        @Field("title") String title,
        @Field("note") String note,
        @Field("color") int color
    );

    @GET("notes.php")
    Call<List<Note>> getNotes();

    @FormUrlEncoded
    @POST("update.php")
    Call<Note> updateNote(
            @Field("id") int id,
            @Field("title") String title,
            @Field("note") String note,
            @Field("color") int color
    );

    @FormUrlEncoded
    @POST("delete.php")
    Call<Note> deleteNote( @Field("id") int id );

}

build.gradle

implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support:recyclerview-v7:27.1.1'
implementation 'com.android.support:cardview-v7:27.1.1'
implementation 'com.squareup.retrofit2:retrofit:2.4.0'
implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
implementation 'com.thebluealliance:spectrum:0.7.1'

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#1d1f2d</color>
    <color name="colorPrimaryDark">#15161e</color>
    <color name="colorAccent">#189be7</color>

    <!--color palete-->
    <color name="white">#dde6ec</color>
    <color name="blue">#7ec4ed</color>
    <color name="yellow">#d0fc7d</color>
    <color name="pink">#ed579a</color>
    <color name="green">#2aed76</color>

    <array name="demo_colors">
        <item>@color/white</item>
        <item>@color/blue</item>
        <item>@color/yellow</item>
        <item>@color/pink</item>
        <item>@color/green</item>
    </array>

</resources>

EditorActivity.java

import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.Toast;

import com.haerulmuttaqin.mynotesapp.R;
import com.haerulmuttaqin.mynotesapp.api.ApiClient;
import com.haerulmuttaqin.mynotesapp.api.ApiInterface;
import com.haerulmuttaqin.mynotesapp.model.Note;
import com.thebluealliance.spectrum.SpectrumPalette;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class EditorActivity extends AppCompatActivity implements EditorView {

    EditText et_title, et_note;
    ProgressDialog progressDialog;
    SpectrumPalette palette;

    EditorPresenter presenter;

    int color, id;
    String title, note;
    
    Menu actionMenu;

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

        et_title = findViewById(R.id.title);
        et_note = findViewById(R.id.note);
        palette = findViewById(R.id.palette);

        palette.setOnColorSelectedListener(
                clr -> color = clr
        );


//      Progress Dialog
        progressDialog = new ProgressDialog(this);
        progressDialog.setMessage("Please wait...");

        presenter = new EditorPresenter(this);

        Intent intent = getIntent();
        id = intent.getIntExtra("id", 0);
        title = intent.getStringExtra("title");
        note = intent.getStringExtra("note");
        color = intent.getIntExtra("color", 0);
        
        setDataFromIntentExtra();

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_editor, menu);
        actionMenu = menu;

        if (id != 0) {
            actionMenu.findItem(R.id.edit).setVisible(true);
            actionMenu.findItem(R.id.delete).setVisible(true);
            actionMenu.findItem(R.id.save).setVisible(false);
            actionMenu.findItem(R.id.update).setVisible(false);
        } else {
            actionMenu.findItem(R.id.edit).setVisible(false);
            actionMenu.findItem(R.id.delete).setVisible(false);
            actionMenu.findItem(R.id.save).setVisible(true);
            actionMenu.findItem(R.id.update).setVisible(false);
        }


        return true;
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        String title = et_title.getText().toString().trim();
        String note = et_note.getText().toString().trim();
        int color = this.color;

        switch (item.getItemId()) {
            case R.id.save:
                //Save
                if (title.isEmpty()) {
                    et_title.setError("Please enter a title");
                } else if (note.isEmpty()) {
                    et_note.setError("Please enter a note");
                } else {
                    presenter.saveNote(title, note, color);
                }
                return true;

            case R.id.edit:

                editMode();
                actionMenu.findItem(R.id.edit).setVisible(false);
                actionMenu.findItem(R.id.delete).setVisible(false);
                actionMenu.findItem(R.id.save).setVisible(false);
                actionMenu.findItem(R.id.update).setVisible(true);

                return true;

            case R.id.update:
                //Update

                if (title.isEmpty()) {
                    et_title.setError("Please enter a title");
                } else if (note.isEmpty()) {
                    et_note.setError("Please enter a note");
                } else {
                    presenter.updateNote(id, title, note, color);
                }

                return true;

            case R.id.delete:

                AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
                alertDialog.setTitle("Confirm !");
                alertDialog.setMessage("Are you sure?");
                alertDialog.setNegativeButton("Yes", (dialog, which) -> {
                    dialog.dismiss();
                    presenter.deleteNote(id);
                });
                alertDialog.setPositiveButton("Cencel",
                        (dialog, which) -> dialog.dismiss());

                alertDialog.show();

                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }


    @Override
    public void showProgress() {
        progressDialog.show();
    }

    @Override
    public void hideProgress() {
        progressDialog.hide();
    }

    @Override
    public void onRequestSuccess(String message) {
        Toast.makeText(EditorActivity.this,
                message,
                Toast.LENGTH_SHORT).show();
        setResult(RESULT_OK);
        finish(); //back to main activity
    }

    @Override
    public void onRequestError(String message) {
        Toast.makeText(EditorActivity.this,
                message,
                Toast.LENGTH_SHORT).show();
    }

    private void setDataFromIntentExtra() {

        if (id != 0) {
            et_title.setText(title);
            et_note.setText(note);
            palette.setSelectedColor(color);

            getSupportActionBar().setTitle("Update Note");
            readMode();
        } else {
            palette.setSelectedColor(getResources().getColor(R.color.white));
            color = getResources().getColor(R.color.white);
            editMode();
        }

    }

    private void editMode() {
        et_title.setFocusableInTouchMode(true);
        et_note.setFocusableInTouchMode(true);
        palette.setEnabled(true);
    }

    private void readMode() {
        et_title.setFocusableInTouchMode(false);
        et_note.setFocusableInTouchMode(false);
        et_title.setFocusable(false);
        et_note.setFocusable(false);
        palette.setEnabled(false);
    }
}

item_note.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="4dp"
    android:layout_marginBottom="4dp"
    app:cardCornerRadius="2dp"
    app:cardElevation="1dp"
    android:clickable="true"
    android:focusable="true"
    android:foreground="?attr/selectableItemBackground"
    android:id="@+id/card_item">

    <LinearLayout
        android:id="@+id/line"
        android:layout_width="10dp"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:background="#49000000"/>

    <RelativeLayout
        android:padding="10dp"
        android:layout_marginStart="10dp"
        android:layout_marginLeft="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/title"
            android:text="@string/to_do"
            android:textSize="18sp"
            android:textColor="@android:color/black"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/note"
            android:layout_below="@id/title"
            android:text="@string/enter_note"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"/>

        <TextView
            android:id="@+id/date"
            android:layout_below="@id/note"
            android:text="@string/date"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:gravity="end"/>

    </RelativeLayout>

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

MainActivity.java

import android.content.Intent;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.Toast;

import com.haerulmuttaqin.mynotesapp.R;
import com.haerulmuttaqin.mynotesapp.activity.editor.EditorActivity;
import com.haerulmuttaqin.mynotesapp.model.Note;

import java.util.List;

public class MainActivity extends AppCompatActivity implements MainView {

    private static final int INTENT_ADD = 100;
    private static final int INTENT_EDIT = 200;
    FloatingActionButton fab;
    RecyclerView recyclerView;
    SwipeRefreshLayout swipeRefresh;

    MainPresenter presenter;
    MainAdapter adapter;
    MainAdapter.ItemClickListener itemClickListener;

    List<Note> note;

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

        swipeRefresh = findViewById(R.id.swipe_refresh);
        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        fab = findViewById(R.id.add);
        fab.setOnClickListener(view ->
            startActivityForResult(
                    new Intent(this, EditorActivity.class),
                    INTENT_ADD)
        );

        presenter = new MainPresenter(this);
        presenter.getData();

        swipeRefresh.setOnRefreshListener(
                () -> presenter.getData()
        );

        itemClickListener = ((view, position) -> {
            int id = note.get(position).getId();
            String title = note.get(position).getTitle();
            String notes = note.get(position).getNote();
            int color = note.get(position).getColor();

            Intent intent = new Intent(this, EditorActivity.class);
            intent.putExtra("id", id);
            intent.putExtra("title", title);
            intent.putExtra("note", notes);
            intent.putExtra("color", color);
            startActivityForResult(intent, INTENT_EDIT);

        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == INTENT_ADD && resultCode == RESULT_OK) {
            presenter.getData(); //reload data
        }
        else if (requestCode == INTENT_EDIT && resultCode == RESULT_OK) {
            presenter.getData(); //reload data
        }

    }

    @Override
    public void showLoading() {
        swipeRefresh.setRefreshing(true);
    }

    @Override
    public void hideLoading() {
        swipeRefresh.setRefreshing(false);
    }

    @Override
    public void onGetResult(List<Note> notes) {
        adapter = new MainAdapter(this, notes, itemClickListener);
        adapter.notifyDataSetChanged();
        recyclerView.setAdapter(adapter);

        note = notes;
    }

    @Override
    public void onErrorLoading(String message) {
        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
    }
}

menu_editor.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:id="@+id/edit"
        android:title="@string/edit"
        android:icon="@drawable/ic_edit"
        app:showAsAction="always" />

    <item
        android:id="@+id/delete"
        android:title="@string/delete"
        android:icon="@drawable/ic_delete"
        app:showAsAction="always" />


    <item
        android:id="@+id/update"
        android:title="@string/update"
        android:icon="@drawable/ic_save"
        app:showAsAction="always" />


    <item
        android:id="@+id/save"
        android:title="@string/save"
        android:icon="@drawable/ic_save"
        app:showAsAction="always" />

</menu>

Note.java

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class Note {

    @Expose
    @SerializedName("id") private int id;
    @Expose
    @SerializedName("title") private String title;
    @Expose
    @SerializedName("note") private String note;
    @Expose
    @SerializedName("color") private int color;
    @Expose
    @SerializedName("date") private String date;
    @Expose
    @SerializedName("success") private Boolean success;
    @Expose
    @SerializedName("message") private String message;


    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getNote() {
        return note;
    }

    public void setNote(String note) {
        this.note = note;
    }

    public int getColor() {
        return color;
    }

    public void setColor(int color) {
        this.color = color;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public Boolean getSuccess() {
        return success;
    }

    public void setSuccess(Boolean success) {
        this.success = success;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}