Version 1.0 Loginov

app/build.gradle

@@ -25,4 +25,6 @@ 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 'com.android.support:design:28.0.0'
 }

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

@@ -1,14 +1,152 @@
 package ru.ok.technopolis.students;
 
+import android.app.AlertDialog;
+import android.content.DialogInterface;
+import android.support.design.widget.FloatingActionButton;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+
+import java.util.ArrayList;
+import java.util.Random;
 
 public class MainActivity extends AppCompatActivity {
+    private static final String DIALOG_TAG = "DialogAdder";
+    private String[] mansFirstNames;
+    private String[] womenFirstNames;
+    private String[] lastNames;
+    private int[] manPhotos;
+    private int[] womanPhotos;
+    private Random random;
+    private int manPhotoIndex, womanPhotoIndex;
+    private ArrayList<Student> students;
+    private StudentsAdapter adapter;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        random = new Random();
+        manPhotoIndex = womanPhotoIndex = 0;
+        mansFirstNames = getResources().getStringArray(R.array.mans_first_names);
+        womenFirstNames = getResources().getStringArray(R.array.women_first_names);
+        lastNames = getResources().getStringArray(R.array.last_names);
+        manPhotos = new int[]{R.drawable.male_01, R.drawable.male_02, R.drawable.male_03};
+        womanPhotos = new int[]{R.drawable.female_01, R.drawable.female_02, R.drawable.female_03};
+
+
+        RecyclerView recyclerView = findViewById(R.id.activity_main__recycler_view);
+        FloatingActionButton fabAdd = findViewById(R.id.activity_main__fab_add);
+
+        fabAdd.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                StudentAdderDialog dialog = new StudentAdderDialog();
+                dialog.setOnAdderStudentListener(new StudentAdderDialog.OnAdderStudentListener() {
+                    @Override
+                    public void add(String firstName, String lastName, boolean maleGender) {
+                        Student student = new Student(firstName, lastName, maleGender, maleGender ? manPhotos[manPhotoIndex++ % 3] : womanPhotos[womanPhotoIndex++ % 3]);
+                        students.add(student);
+                        adapter.notifyDataSetChanged();
+                    }
+                });
+                dialog.show(getSupportFragmentManager(), DIALOG_TAG);
+            }
+        });
+
+        students = createStudents();
+        adapter = new StudentsAdapter(students, new StudentsAdapter.OnStudentClickListener() {
+            @Override
+            public void onStudentClick(Student student) {
+                showDialog(student);
+            }
+        });
+        recyclerView.setAdapter(adapter);
+        LinearLayoutManager mLayoutManager = new GridLayoutManager(this, 2);
+        recyclerView.setLayoutManager(mLayoutManager);
+    }
+
+    private void showDialog(final Student student) {
+        ImageView view = new ImageView(this);
+        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(300, 300);
+        view.setScaleType(ImageView.ScaleType.CENTER_CROP);
+        view.setLayoutParams(layoutParams);
+        view.setImageResource(student.getPhoto());
+
+        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
+
+        builder.setView(view);
+        builder.setTitle(student.getFirstName() + " " + student.getSecondName());
+        builder.setMessage(student.isMaleGender() ? R.string.guy : R.string.girl);
+        builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialogInterface, int i) {
+                dialogInterface.cancel();
+            }
+        });
+
+        builder.setNegativeButton(R.string.edit, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialogInterface, int i) {
+                StudentAdderDialog dialog = new StudentAdderDialog();
+                Bundle bundle = new Bundle();
+                bundle.putSerializable(StudentAdderDialog.STUDENT_TAG, student);
+                dialog.setArguments(bundle);
+
+                dialog.setOnUpdateStudentListener(new StudentAdderDialog.OnUpdateStudentListener() {
+                    @Override
+                    public void update(Student oldStudent, Student newStudent) {
+                        int index = students.indexOf(oldStudent);
+                        students.remove(oldStudent);
+                        if (oldStudent.isMaleGender() != newStudent.isMaleGender()) {
+                            newStudent.setPhoto(newStudent.isMaleGender() ? manPhotos[manPhotoIndex++ % 3] : womanPhotos[womanPhotoIndex++ % 3]);
+                        }
+                        students.add(index, newStudent);
+                        adapter.notifyDataSetChanged();
+                    }
+                });
+
+                dialog.show(getSupportFragmentManager(), DIALOG_TAG);
+                dialogInterface.cancel();
+            }
+        });
+
+        builder.setNeutralButton(R.string.delete, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialogInterface, int i) {
+                students.remove(student);
+                adapter.notifyDataSetChanged();
+                dialogInterface.cancel();
+            }
+        });
+        builder.create().show();
+    }
+
+
+    ArrayList<Student> createStudents() {
+        ArrayList<Student> students = new ArrayList<>();
+        for (int i = 0; i < 20; i++) {
+            students.add(nextStudent(i % 2 == 0));
+        }
+        return students;
     }
 
+
+    Student nextStudent(boolean maleGender) {
+        if (maleGender) {
+            int nameIndex = random.nextInt(mansFirstNames.length);
+            int lastNameIndex = random.nextInt(mansFirstNames.length);
+            return new Student(mansFirstNames[nameIndex], lastNames[lastNameIndex], true, manPhotos[manPhotoIndex++ % 3]);
+        }
+        int nameIndex = random.nextInt(womenFirstNames.length);
+        int lastNameIndex = random.nextInt(womenFirstNames.length);
+        return new Student(womenFirstNames[nameIndex], lastNames[lastNameIndex] + "a", false, womanPhotos[womanPhotoIndex++ % 3]);
+    }
+
+
 }

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

@@ -1,6 +1,9 @@
 package ru.ok.technopolis.students;
 
-public class Student {
+
+import java.io.Serializable;
+
+public class Student implements Serializable {
 
     private String firstName;
     private String secondName;
@@ -14,6 +17,7 @@ public Student(String firstName, String secondName, boolean maleGender, int phot
         this.photo = photo;
     }
 
+
     public String getFirstName() {
         return firstName;
     }
@@ -45,4 +49,10 @@ public int getPhoto() {
     public void setPhoto(int photo) {
         this.photo = photo;
     }
+
+    @Override
+    public String toString() {
+        return firstName + " " + secondName + (isMaleGender() ? " М" : " Ж");
+    }
+
 }