com.osama.cgpacalculator.MainActivity.java Source code

Introduction

Here is the source code for com.osama.cgpacalculator.MainActivity.java

Source

package com.osama.cgpacalculator;

import android.annotation.SuppressLint;
import android.app.Dialog;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.design.widget.Snackbar;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import android.widget.FrameLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements SubjectsAdapter.SubjectsAdapterCallbacks {

    private RecyclerView mSubjectsList;
    private SubjectsAdapter mAdapter;
    private int numberOfSubjects = 5;
    private CollapsingToolbarLayout collapsingToolbarLayout;

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

        setupRecyclerView();
        animateWhat();

        setCollapsingBar();

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        toolbar.setTitle("");

        findViewById(R.id.calculate_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                calculateButtonClick(view);
            }
        });
    }

    private void setCollapsingBar() {
        collapsingToolbarLayout = findViewById(R.id.collapsing_bar);
        collapsingToolbarLayout.setCollapsedTitleTextColor(Color.parseColor("#4caf50"));
        collapsingToolbarLayout.setExpandedTitleColor(Color.TRANSPARENT);
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        return super.onPrepareOptionsMenu(menu);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.reset_menuitem: {
            recreate();
            break;
        }
        case R.id.about_menuitem: {
            showAboutDialog();
            break;
        }
        case R.id.grade_detail_menuitem: {
            startActivity(new Intent(this, GradeDetailsActivity.class));
            break;
        }
        }
        return true;
    }

    private boolean isShowingCr = false;
    private boolean isShowingLi = false;

    @SuppressLint("InflateParams")
    private void showAboutDialog() {
        final ScaleAnimation animation = new ScaleAnimation(0f, 1f, 0f, 1f);
        animation.setDuration(800);

        Dialog dialog = new Dialog(this);
        dialog.setContentView(R.layout.about_dialog);

        final FrameLayout frame = ((FrameLayout) dialog.findViewById(R.id.about_content_layout));
        frame.addView(getLayoutInflater().inflate(R.layout.intro_section_layout, null));

        dialog.findViewById(R.id.credit_dialog_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                frame.removeAllViews();
                isShowingLi = false;
                if (!isShowingCr) {
                    frame.addView(getLayoutInflater().inflate(R.layout.credits_layout, null));
                    isShowingCr = true;
                    frame.setAnimation(animation);
                } else {
                    frame.addView(getLayoutInflater().inflate(R.layout.intro_section_layout, null));
                    isShowingCr = false;
                    frame.setAnimation(animation);
                }
                frame.animate();
            }
        });

        dialog.findViewById(R.id.license_dialog_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                frame.removeAllViews();
                isShowingCr = false;
                if (!isShowingLi) {
                    frame.addView(getLayoutInflater().inflate(R.layout.license_layout, null));
                    isShowingLi = true;
                    frame.setAnimation(animation);
                } else {
                    frame.addView(getLayoutInflater().inflate(R.layout.intro_section_layout, null));
                    isShowingLi = false;
                    frame.setAnimation(animation);
                }
                frame.animate();
            }
        });

        dialog.show();
    }

    private void setupRecyclerView() {
        mSubjectsList = (RecyclerView) findViewById(R.id.subjects_list);
        mAdapter = new SubjectsAdapter(this, numberOfSubjects);

        mSubjectsList.setLayoutManager(new LinearLayoutManager(this));
        mSubjectsList.setAdapter(mAdapter);

    }

    private static final int MAX = 6;

    public void addNewSubject(View view) {
        if (numberOfSubjects > MAX) {
            Snackbar.make(view, "Do you really want to add another subject?", Snackbar.LENGTH_LONG)
                    .setAction("Yes", new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            addSubject();
                        }
                    }).show();
        } else {
            addSubject();
        }

    }

    private void addSubject() {
        mAdapter.setNumberofSubjects(++numberOfSubjects);
        mAdapter.notifyItemInserted(numberOfSubjects - 1);
    }

    private int getCgpaColor(float cgpa) {
        if (cgpa >= 3) {
            return ContextCompat.getColor(this, R.color.colorGradeAPlus);
        } else if (cgpa >= 2.5) {
            return ContextCompat.getColor(this, R.color.colorGradeBPlus);
        } else if (cgpa >= 2) {
            return ContextCompat.getColor(this, R.color.colorGradeCPlus);
        } else if (cgpa >= 1.5) {
            return ContextCompat.getColor(this, R.color.colorGradeD);
        } else {
            return ContextCompat.getColor(this, R.color.colorGradeF);
        }
    }

    @SuppressLint("SetTextI18n")
    public void calculateButtonClick(View view) {
        if (mAdapter.getPreviousCgpa() > 4) {
            Snackbar.make(view, "Invalid previous cgpa.", Snackbar.LENGTH_LONG)
                    .setAction("Override", new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            calculate(view);
                        }
                    }).show();
        } else {
            calculate(view);
        }

    }

    private void calculate(View view) {
        float goo = BackendCalculator.getInstance().calculateCgpa(mAdapter.getPreviousCrHrs(),
                mAdapter.getPreviousCgpa());

        TextView textView = ((TextView) findViewById(R.id.show_cgpa_textview));
        textView.setText("GPA: " + goo);
        gpaAnimation(textView);
        textView.setTextColor(getCgpaColor(goo));
        collapsingToolbarLayout.setTitle("GPA: " + goo);
        collapsingToolbarLayout.setCollapsedTitleTextColor(getCgpaColor(goo));
    }

    //trying to animate something
    private void animateWhat() {
        Animation animation = new ScaleAnimation(0f, 1f, 0f, 1f);
        animation.setDuration(800);
        mSubjectsList.setAnimation(animation);
        mSubjectsList.animate();
    }

    private void gpaAnimation(View view) {
        ScaleAnimation animation = new ScaleAnimation(0f, 1f, 1f, 1f);
        animation.setDuration(500);
        view.setAnimation(animation);
        view.animate();
    }

    @Override
    public void moveToPos(int pos) {
        if (pos == -1) {
            return;
        }
        mSubjectsList.scrollToPosition(pos);
    }
}