ActivityTransitionsCodeFragment.java

package com.luciofm.droidcon.ifican.fragment;


import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.ImageView;


import com.luciofm.droidcon.ifican.IfICan;
import com.luciofm.droidcon.ifican.R;
import com.luciofm.droidcon.ifican.activity.MainActivity;
import com.luciofm.droidcon.ifican.activity.TransitionActivity;
import com.luciofm.droidcon.ifican.anim.XFractionProperty;
import com.luciofm.droidcon.ifican.model.Dog;
import com.luciofm.droidcon.ifican.model.ViewInfo;
import com.luciofm.droidcon.ifican.util.ActivityFinishEvent;
import com.luciofm.droidcon.ifican.util.Utils;
import com.squareup.otto.Subscribe;

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

import butterknife.ButterKnife;
import butterknife.InjectView;
import butterknife.OnClick;

/**
 * A simple {@link android.app.Fragment} subclass.
 *
 */
public class ActivityTransitionsCodeFragment extends BaseFragment {

    private static final int REQUEST_CODE = 666;
    @InjectView(R.id.grid)
    GridView grid;

    ArrayList<Dog> dogs;

    private int currentStep;

    private View currentView;
    private int currentPosition = -1;

    boolean override;

    public ActivityTransitionsCodeFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        dogs = new ArrayList<>();
        dogs.add(new Dog(R.drawable.dog1, "dog1"));
        dogs.add(new Dog(R.drawable.dog2, "dog2"));
        dogs.add(new Dog(R.drawable.dog3, "dog3"));
        dogs.add(new Dog(R.drawable.dog6, "dog6"));
        dogs.add(new Dog(R.drawable.dog7, "dog7"));
        dogs.add(new Dog(R.drawable.dog8, "dog8"));
        dogs.add(new Dog(R.drawable.dog9, "dog9"));
        dogs.add(new Dog(R.drawable.dog10, "dog10"));

        IfICan.getBusInstance().register(this);
    }

    @Override
    public int getLayout() {
        return R.layout.fragment_activity_transitions_code;
    }

    @Override
    public String getMessage() {
        return null;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = super.onCreateView(inflater, container, savedInstanceState);
        ButterKnife.inject(this, v);

        grid.setAdapter(new DogsAdapter(getActivity(), dogs));
        grid.setSelector(android.R.color.transparent);
        grid.setOnItemClickListener(clickListener);

        currentStep = 1;
        return v;
    }

    @Override
    public void onDestroy() {
        IfICan.getBusInstance().unregister(this);
        super.onDestroy();
    }

    @Override
    public void onNextPressed() {
        switch (++currentStep) {
            case 2:
                int position = new Random().nextInt(grid.getChildCount());
                Utils.dispatchTouch(grid.getChildAt(position));
                break;
            case 3:
                override = false;
                super.onNextPressed();
                break;
        }
    }

    AdapterView.OnItemClickListener clickListener = new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            if (override == true) {
                override = false;
                ((MainActivity) getActivity()).nextFragment();
                return;
            }

            if (currentStep == 1)
                currentStep = 2;

            Dog dog = (Dog) view.getTag();
            ViewInfo info = new ViewInfo(view, position);
            currentView = view;
            currentView.animate().alpha(0f).setDuration(50);
            currentPosition = position;

            Intent intent = new Intent(getActivity(), TransitionActivity.class);
            intent.putExtra("DOG", dog);
            intent.putExtra("INFO", info);
            startActivityForResult(intent, REQUEST_CODE);
            getActivity().overridePendingTransition(0, 0);
        }
    };

    @Subscribe
    public void onActivityFinishedEvent(ActivityFinishEvent event) {
        if (currentView != null) {
            currentView.setAlpha(0f);
            currentView.animate().alpha(1f)
                    .setStartDelay(Utils.calcDuration(currentPosition) - 300)
                    .setDuration(350);
        }
    }

    @OnClick(R.id.container)
    public void onClick() {
        onNextPressed();
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        /* Ok, we didn' went through all the steps in the TransitionActivity */
        if (requestCode == REQUEST_CODE) {
            override = false;
            if (resultCode != Activity.RESULT_OK)
                currentStep--;
            else if (resultCode == Activity.RESULT_OK)
                override = true;
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    @Override
    public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) {
        if (transit == 0) {
            return null;
        }

        //Target will be filled in by the framework
        return enter ? ObjectAnimator.ofFloat(null, new XFractionProperty(), 1f, 0f)
                       : ObjectAnimator.ofFloat(null, new XFractionProperty(), 0f, -1f);
    }

    public class DogsAdapter extends ArrayAdapter<Dog> {

        LayoutInflater inflater;


        public DogsAdapter(Context context, List<Dog> objects) {
            super(context, 0, objects);
            inflater = LayoutInflater.from(context);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View v = convertView;

            if (v == null) {
                v = inflater.inflate(R.layout.adapter_image, parent, false);
            }

            Dog dog = getItem(position);
            ImageView image = ButterKnife.findById(v, R.id.image);
            image.setImageResource(dog.getResource());
            v.setTag(dog);

            return v;
        }
    }
}