HW2

app/build.gradle

@@ -16,6 +16,10 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
+    compileOptions {
+        sourceCompatibility = '1.8'
+        targetCompatibility = '1.8'
+    }
 }
 
 dependencies {
@@ -25,4 +29,6 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    implementation 'com.android.support:recyclerview-v7:28.0.0'
+    implementation 'de.hdodenhof:circleimageview:3.0.0'
 }

app/src/main/java/ru/ok/technopolis/students/MainActivity.java

@@ -2,13 +2,176 @@
 
 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.Button;
+import android.widget.CheckBox;
+import android.widget.EditText;
+import android.widget.Toast;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+import de.hdodenhof.circleimageview.CircleImageView;
 
 public class MainActivity extends AppCompatActivity {
 
+    private List<Student> students;
+    private StudentsAdapter studentsAdapter;
+    private Student currentStudent;
+    private EditText firstNameView;
+    private EditText lastNameView;
+    private CheckBox genderView;
+    private CircleImageView photoView;
+    private Button buttonAdd;
+    private Button buttonSave;
+    private Button buttonDelete;
+    final private Random random = new Random();
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        RecyclerView recyclerView = findViewById(R.id.activity_main_students_list);
+        students = generateStudentList();
+        studentsAdapter = new StudentsAdapter(students, this::onStudentClick);
+        recyclerView.setAdapter(studentsAdapter);
+        LinearLayoutManager mLayoutManager = new LinearLayoutManager(this);
+        recyclerView.setLayoutManager(mLayoutManager);
+        firstNameView = findViewById(R.id.activity_main_student_first_name);
+        lastNameView = findViewById(R.id.activity_main_student_last_name);
+        genderView = findViewById(R.id.activity_main_student_gender);
+        photoView = findViewById(R.id.activity_main_student_photo);
+        buttonAdd = findViewById(R.id.activity_main_button_add);
+        buttonSave = findViewById(R.id.activity_main_button_save);
+        buttonDelete = findViewById(R.id.activity_main_button_delete);
+        setupAddButton();
+        setupDeleteButton();
+        setupSaveButton();
+    }
+
+    private void setupAddButton() {
+        buttonAdd.setOnClickListener(v -> {
+            currentStudent = generateNewStudent();
+            if (currentStudent != null) {
+                students.add(currentStudent);
+                studentsAdapter.notifyDataSetChanged();
+                cleanCard();
+                return;
+            }
+            Toast toast = Toast.makeText(this,
+                    "Fill first name and last name", Toast.LENGTH_SHORT);
+            toast.show();
+        });
+    }
+
+    private void setupSaveButton() {
+        buttonSave.setOnClickListener(v -> {
+            if (currentStudent != null) {
+                if (editStudent()) {
+                    studentsAdapter.notifyDataSetChanged();
+                    cleanCard();
+                    return;
+                }
+                Toast toast = Toast.makeText(this,
+                        "Fill first name and last name", Toast.LENGTH_SHORT);
+                toast.show();
+                return;
+            }
+            Toast toast = Toast.makeText(this,
+                    "Choose a student", Toast.LENGTH_SHORT);
+            toast.show();
+        });
+    }
+
+    private void setupDeleteButton() {
+        buttonDelete.setOnClickListener(v -> {
+            int index = students.indexOf(currentStudent);
+            if (index != -1) {
+                students.remove(currentStudent);
+                studentsAdapter.notifyDataSetChanged();
+                cleanCard();
+                return;
+            }
+            Toast toast = Toast.makeText(this,
+                    "Choose a student", Toast.LENGTH_SHORT);
+            toast.show();
+        });
     }
 
+    private void cleanCard() {
+        firstNameView.setText("");
+        lastNameView.setText("");
+        genderView.setChecked(false);
+        photoView.setImageResource(R.color.colorGray);
+        currentStudent = null;
+    }
+
+    public void onStudentClick(Student student) {
+        currentStudent = student;
+        setStudentCard();
+    }
+
+    private void setStudentCard() {
+        firstNameView.setText(currentStudent.getFirstName());
+        lastNameView.setText(currentStudent.getSecondName());
+        genderView.setChecked(currentStudent.isMaleGender());
+        photoView.setImageResource(currentStudent.getPhoto());
+    }
+
+    private int choosePhoto(boolean isMale) {
+        String photoName;
+        if (isMale) {
+            photoName = "male_";
+        } else {
+            photoName = "female_";
+        }
+        return getResources().getIdentifier(photoName + (random.nextInt(3) + 1), "drawable", getPackageName());
+
+    }
+
+    private Student generateNewStudent() {
+        String firstName;
+        String lastName;
+        try {
+            firstName = firstNameView.getText().toString();
+            lastName = lastNameView.getText().toString();
+        } catch (NullPointerException e) {
+            return null;
+        }
+        if (firstName.length() != 0 && lastName.length() != 0) {
+            boolean isMale = genderView.isChecked();
+            return new Student(firstName, lastName, isMale, choosePhoto(isMale));
+        }
+        return null;
+    }
+
+    private boolean editStudent() {
+        String firstName = firstNameView.getText().toString();
+        String lastName = lastNameView.getText().toString();
+        if (firstName.length() != 0 && lastName.length() != 0) {
+            currentStudent.setFirstName(firstName);
+            currentStudent.setSecondName(lastName);
+            boolean oldIsMale = currentStudent.isMaleGender();
+            currentStudent.setMaleGender(genderView.isChecked());
+            if (oldIsMale != currentStudent.isMaleGender()) {
+                currentStudent.setPhoto(choosePhoto(currentStudent.isMaleGender()));
+                cleanCard();
+            }
+            return true;
+        }
+        return false;
+    }
+
+    private List<Student> generateStudentList() {
+        List<Student> students = new ArrayList<>();
+        students.add(new Student("Ivan", "Ivanov", true, R.drawable.male_1));
+        students.add(new Student("Rita", "Ritina", false, R.drawable.female_1));
+        students.add(new Student("Petr", "Petrov", true, R.drawable.male_2));
+        students.add(new Student("Masha", "Mashina", false, R.drawable.female_2));
+        students.add(new Student("Kyzya", "Kyzin", true, R.drawable.male_3));
+        students.add(new Student("Tanya", "Tanina", false, R.drawable.female_3));
+        return students;
+    }
 }

app/src/main/java/ru/ok/technopolis/students/StudentsAdapter.java

@@ -0,0 +1,68 @@
+package ru.ok.technopolis.students;
+
+import android.support.annotation.NonNull;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import java.util.List;
+
+public class StudentsAdapter extends RecyclerView.Adapter<StudentsAdapter.StudentViewHolder> {
+
+    private final List<Student> students;
+    private final Listener onStudentClickListener;
+    private int focusedItem = -1;
+
+    public StudentsAdapter(List<Student> students, Listener onStudentClickListener) {
+        this.students = students;
+        this.onStudentClickListener = onStudentClickListener;
+    }
+
+    @NonNull
+    @Override
+    public StudentViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
+        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.student_item, viewGroup, false);
+        view.setOnClickListener(v -> {
+            focusedItem = ((RecyclerView.LayoutParams) v.getLayoutParams()).getViewLayoutPosition();
+            notifyDataSetChanged();
+            onStudentClickListener.onStudentClick((Student) v.getTag());
+        });
+        return new StudentViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull StudentViewHolder viewHolder, final int i) {
+        Student student = students.get(i);
+        viewHolder.bind(student);
+        viewHolder.itemView.setTag(student);
+        viewHolder.itemView.setSelected(focusedItem == i);
+    }
+
+    @Override
+    public int getItemCount() {
+        return students.size();
+    }
+
+    static final class StudentViewHolder extends RecyclerView.ViewHolder {
+        private final TextView nameView;
+        private final ImageView photoView;
+
+        private StudentViewHolder(@NonNull View itemView) {
+            super(itemView);
+            nameView = itemView.findViewById(R.id.student_item_name);
+            photoView = itemView.findViewById(R.id.student_item_photo);
+        }
+
+        private void bind(@NonNull Student student) {
+            nameView.setText(student.getFirstName() + " " + student.getSecondName());
+            photoView.setImageResource(student.getPhoto());
+        }
+    }
+
+    interface Listener {
+        void onStudentClick(Student student);
+    }
+}

app/src/main/res/drawable/background_selector.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@color/colorGray" android:state_selected="true" />
+</selector>

app/src/main/res/layout/activity_main.xml

@@ -1,9 +1,101 @@
 <?xml version="1.0" encoding="utf-8"?>
 <android.support.constraint.ConstraintLayout 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=".MainActivity">
 
+    <android.support.constraint.Guideline
+        android:id="@+id/activity_main_line_bottom"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        app:layout_constraintGuide_percent="0.95" />
+
+    <android.support.constraint.Guideline
+        android:id="@+id/activity_main_line_left"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        app:layout_constraintGuide_percent="0.05" />
+
+    <android.support.constraint.Guideline
+        android:id="@+id/activity_main_line_right"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        app:layout_constraintGuide_percent="0.95" />
+
+    <android.support.v7.widget.RecyclerView
+        android:id="@+id/activity_main_students_list"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toTopOf="@+id/activity_main_button_add"
+        app:layout_constraintEnd_toStartOf="@+id/activity_main_line_right"
+        app:layout_constraintStart_toEndOf="@+id/activity_main_line_left"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/activity_main_button_add"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/button_add"
+        app:layout_constraintBottom_toTopOf="@id/activity_main_student_photo"
+        app:layout_constraintEnd_toStartOf="@id/activity_main_line_right"
+        app:layout_constraintStart_toEndOf="@id/activity_main_line_left" />
+
+    <Button
+        android:id="@+id/activity_main_button_delete"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/button_delete"
+        app:layout_constraintBottom_toTopOf="@id/activity_main_line_bottom"
+        app:layout_constraintStart_toEndOf="@id/activity_main_line_left" />
+
+    <Button
+        android:id="@+id/activity_main_button_save"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/button_save"
+        app:layout_constraintBottom_toTopOf="@id/activity_main_line_bottom"
+        app:layout_constraintEnd_toStartOf="@id/activity_main_line_right" />
+
+    <de.hdodenhof.circleimageview.CircleImageView
+        android:id="@+id/activity_main_student_photo"
+        android:layout_width="100dp"
+        android:layout_height="100dp"
+        android:src="@color/colorGray"
+        app:layout_constraintBottom_toBottomOf="@id/activity_main_student_first_name"
+        app:layout_constraintStart_toEndOf="@id/activity_main_line_left" />
+
+    <EditText
+        android:id="@+id/activity_main_student_last_name"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:hint="@string/last_name"
+        android:maxLines="1"
+        app:layout_constraintBottom_toTopOf="@id/activity_main_student_first_name"
+        app:layout_constraintEnd_toStartOf="@id/activity_main_line_right"
+        app:layout_constraintStart_toEndOf="@id/activity_main_student_photo" />
+
+    <EditText
+        android:id="@+id/activity_main_student_first_name"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:hint="@string/first_name"
+        android:maxLines="1"
+        app:layout_constraintBottom_toTopOf="@id/activity_main_student_gender"
+        app:layout_constraintEnd_toStartOf="@id/activity_main_line_right"
+        app:layout_constraintStart_toEndOf="@id/activity_main_student_photo" />
+
+
+    <CheckBox
+        android:id="@+id/activity_main_student_gender"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/male"
+        app:layout_constraintBottom_toTopOf="@id/activity_main_button_delete"
+        app:layout_constraintStart_toEndOf="@id/activity_main_student_photo" />
 
 </android.support.constraint.ConstraintLayout>