Java tutorial
/* * Copyright 2016 Google Inc. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.google.android.apps.forscience.whistlepunk.project.experiment; import android.content.ComponentName; import android.content.Intent; import android.os.Bundle; import android.support.design.widget.Snackbar; import android.support.v4.app.Fragment; import android.support.v4.app.NavUtils; import android.support.v7.app.ActionBar; import android.support.v7.app.AppCompatActivity; import android.text.Editable; import android.text.TextWatcher; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.EditText; import android.widget.TextView; import com.google.android.apps.forscience.javalib.Success; import com.google.android.apps.forscience.whistlepunk.AccessibilityUtils; import com.google.android.apps.forscience.whistlepunk.AppSingleton; import com.google.android.apps.forscience.whistlepunk.DataController; import com.google.android.apps.forscience.whistlepunk.LoggingConsumer; import com.google.android.apps.forscience.whistlepunk.R; import com.google.android.apps.forscience.whistlepunk.WhistlePunkApplication; import com.google.android.apps.forscience.whistlepunk.analytics.TrackerConstants; import com.google.android.apps.forscience.whistlepunk.metadata.Experiment; import com.google.android.apps.forscience.whistlepunk.project.ProjectDetailsActivity; import com.google.android.apps.forscience.whistlepunk.project.ProjectDetailsFragment; /** * Fragment for saving/updating experiment detials (title, description...etc). */ public class UpdateExperimentFragment extends Fragment { private static final String TAG = "UpdateExperimentFrag"; /** * Indicates the experiment ID we're currently updating. */ public static final String ARG_EXPERIMENT_ID = "experiment_id"; /** * Boolean extra denoting whether this is a new experiment or not. */ public static final String ARG_NEW = "new"; /** * Parcelable extra with the component name of the parent class that should be used when saving * or quitting. If {@code null}, do the default handling. */ public static final String ARG_PARENT_COMPONENT = "parent_component"; private String mExperimentId; private Experiment mExperiment; private TextView mExperimentTitle; private TextView mExperimentDescription; private ComponentName mParentComponent; private boolean mWasEdited; public UpdateExperimentFragment() { } public static UpdateExperimentFragment newInstance(String experimentId, boolean isNewExperiment, ComponentName parentComponent) { UpdateExperimentFragment fragment = new UpdateExperimentFragment(); Bundle args = new Bundle(); args.putString(ARG_EXPERIMENT_ID, experimentId); args.putBoolean(ARG_NEW, isNewExperiment); args.putParcelable(ARG_PARENT_COMPONENT, parentComponent); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mExperimentId = getArguments().getString(ARG_EXPERIMENT_ID); mParentComponent = getArguments().getParcelable(ARG_PARENT_COMPONENT); getDataController().getExperimentById(mExperimentId, new LoggingConsumer<Experiment>(TAG, "load experiment") { @Override public void success(Experiment experiment) { attachExperimentDetails(experiment); } }); getActivity().setTitle(getString(isNewExperiment() ? R.string.title_activity_new_experiment : R.string.title_activity_update_experiment)); setHasOptionsMenu(true); } @Override public void onResume() { super.onResume(); WhistlePunkApplication.getUsageTracker(getActivity()) .trackScreenView(isNewExperiment() ? TrackerConstants.SCREEN_NEW_EXPERIMENT : TrackerConstants.SCREEN_UPDATE_EXPERIMENT); } @Override public void onPause() { super.onPause(); if (mWasEdited && !isNewExperiment()) { WhistlePunkApplication.getUsageTracker(getActivity()).trackEvent(TrackerConstants.CATEGORY_EXPERIMENTS, TrackerConstants.ACTION_EDITED, null, 0); mWasEdited = false; } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_update_experiment, container, false); mExperimentTitle = (EditText) view.findViewById(R.id.experiment_title); mExperimentDescription = (EditText) view.findViewById(R.id.experiment_description); mExperimentTitle.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { if (mExperiment == null) { return; } if (!s.toString().equals(mExperiment.getTitle())) { mExperiment.setTitle(s.toString().trim()); saveExperiment(); mWasEdited = true; } } @Override public void afterTextChanged(Editable s) { } }); mExperimentDescription.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { if (mExperiment == null) { return; } if (!s.toString().equals(mExperiment.getDescription())) { mExperiment.setDescription(s.toString().trim()); saveExperiment(); mWasEdited = true; } } @Override public void afterTextChanged(Editable s) { } }); return view; } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.menu_update_experiment, menu); ActionBar actionBar = ((AppCompatActivity) getActivity()).getSupportActionBar(); if (isNewExperiment()) { actionBar.setHomeAsUpIndicator(R.drawable.ic_close_white_24dp); } menu.findItem(R.id.action_save).setVisible(isNewExperiment()); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setTitle(getString(isNewExperiment() ? R.string.title_activity_new_experiment : R.string.title_activity_update_experiment)); super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == android.R.id.home) { if (isNewExperiment()) { // We should delete the experiment: user killed it without saving. // TODO: warn the user if they edited anything. deleteExperiment(); } else { goToParent(); } return true; } else if (id == R.id.action_save) { saveExperiment(true /* go to parent when done */); WhistlePunkApplication.getUsageTracker(getActivity()).trackEvent(TrackerConstants.CATEGORY_EXPERIMENTS, TrackerConstants.ACTION_CREATE, null, 0); return true; } return super.onOptionsItemSelected(item); } private boolean isNewExperiment() { return getArguments().getBoolean(ARG_NEW, false); } private void attachExperimentDetails(Experiment experiment) { mExperiment = experiment; mExperimentTitle.setText(experiment.getTitle()); mExperimentDescription.setText(experiment.getDescription()); mWasEdited = false; } private DataController getDataController() { return AppSingleton.getInstance(getActivity()).getDataController(); } /** * Save the experiment and stay on this screen. */ private void saveExperiment() { saveExperiment(false /* stay on this screen */); } /** * Save the experiment and optionally to go the parent, depending on * {@param goToParentWhenDone}. */ private void saveExperiment(final boolean goToParentWhenDone) { getDataController().updateExperiment(mExperiment, new LoggingConsumer<Success>(TAG, "update experiment") { @Override public void fail(Exception e) { super.fail(e); AccessibilityUtils.makeSnackbar(getView(), getResources().getString(R.string.experiment_save_failed), Snackbar.LENGTH_SHORT).show(); } @Override public void success(Success value) { if (goToParentWhenDone) { goToParent(); } } }); } private void deleteExperiment() { getDataController().deleteExperiment(mExperiment, new LoggingConsumer<Success>(TAG, "Deleting new experiment") { @Override public void success(Success value) { if (mParentComponent != null) { goToParent(); } else if (getActivity() != null) { // Go back to the project details page Intent intent = new Intent(getActivity(), ProjectDetailsActivity.class); intent.putExtra(ProjectDetailsFragment.ARG_PROJECT_ID, mExperiment.getProjectId()); NavUtils.navigateUpTo(getActivity(), intent); } else { Log.e(TAG, "Can't exit activity because it's no longer there."); } } }); } private void goToParent() { Intent upIntent; if (mParentComponent != null) { upIntent = new Intent(); upIntent.setClassName(mParentComponent.getPackageName(), mParentComponent.getClassName()); } else { upIntent = NavUtils.getParentActivityIntent(getActivity()); } upIntent.putExtra(ExperimentDetailsFragment.ARG_EXPERIMENT_ID, mExperimentId); if (getActivity() != null) { NavUtils.navigateUpTo(getActivity(), upIntent); } else { Log.e(TAG, "Can't exit activity because it's no longer there."); } } }