AddEditTaskFragmet.java

package com.example.android.architecture.blueprints.todoapp.addedittask;

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.example.android.architecture.blueprints.todoapp.R;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Main UI for the add task screen. Users can enter a task title and description.
 */
public class AddEditTaskFragment extends Fragment implements AddEditTaskContract.View {

    public static final String ARGUMENT_EDIT_TASK_ID = "EDIT_TASK_ID";

    private AddEditTaskContract.Presenter mPresenter;

    private TextView mTitle;

    private TextView mDescription;

    public static AddEditTaskFragment newInstance() {
        return new AddEditTaskFragment();
    }

    public AddEditTaskFragment() {
        // Required empty public constructor
    }

    @Override
    public void onResume() {
        super.onResume();
        mPresenter.start();
    }

    @Override
    public void setPresenter(@NonNull AddEditTaskContract.Presenter presenter) {
        mPresenter = checkNotNull(presenter);
    }

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

        FloatingActionButton fab =
                (FloatingActionButton) getActivity().findViewById(R.id.fab_edit_task_done);
        fab.setImageResource(R.drawable.ic_done);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mPresenter.saveTask(mTitle.getText().toString(), mDescription.getText().toString());
            }
        });
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.addtask_frag, container, false);
        mTitle = (TextView) root.findViewById(R.id.add_task_title);
        mDescription = (TextView) root.findViewById(R.id.add_task_description);
        setHasOptionsMenu(true);
        return root;
    }

    @Override
    public void showEmptyTaskError() {
        Snackbar.make(mTitle, getString(R.string.empty_task_message), Snackbar.LENGTH_LONG).show();
    }

    @Override
    public void showTasksList() {
        getActivity().setResult(Activity.RESULT_OK);
        getActivity().finish();
    }

    @Override
    public void setTitle(String title) {
        mTitle.setText(title);
    }

    @Override
    public void setDescription(String description) {
        mDescription.setText(description);
    }

    @Override
    public boolean isActive() {
        return isAdded();
    }
}