private void onClickLockUnlockGroup(View view) {
if (isRunning) {
if (isLocked) {
Toast.makeText(this, "Group unlocked", Toast.LENGTH_SHORT).show();
lockUnlock.setImageDrawable(unlockDrawable);
observableGroup.unlock();
} else {
Toast.makeText(this, "Group locked", Toast.LENGTH_SHORT).show();
lockUnlock.setImageDrawable(lockDrawable);
observableGroup.lock();
}
isLocked = !isLocked;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
startStop = (FloatingActionButton) findViewById(R.id.fab);
lockUnlock = (FloatingActionButton) findViewById(R.id.fab_pause_resume);
alarmOffDrawable = ContextCompat.getDrawable(this, R.drawable.ic_alarm_off_black_24dp);
alarmDrawable = ContextCompat.getDrawable(this, R.drawable.ic_alarm_black_24dp);
lockDrawable = ContextCompat.getDrawable(this, R.drawable.ic_lock_outline_black_24dp);
unlockDrawable = ContextCompat.getDrawable(this, R.drawable.ic_lock_open_black_24dp);
output = (TextView) findViewById(R.id.txt_output);
setSupportActionBar(toolbar);
startStop.setOnClickListener(this::onClickStartStopTimer);
lockUnlock.setOnClickListener(this::onClickLockUnlockGroup);
SampleApplication application = (SampleApplication) getApplication();
observableManager = application.observableManager();
timerObservable = application.timerObservable();
if (savedInstanceState == null) {
observableGroup = observableManager.newGroup();
} else {
// This doesn't quite work 100% of the time, since in some specific scenarios (eg.: your app
// was killed while in background), when your activity is recreated, your process is also
// recreated, which causes ObservableManager to be empty (no groups). In this case, getGroup()
// would crash since it's obviously not there. It is left as an exercise for the reader on
// how to work around this situation.
observableGroup = observableManager.getGroup(savedInstanceState.getLong(GROUP_ID));
if (savedInstanceState.getBoolean(IS_RUNNING)) {
isRunning = true;
startStop.setImageDrawable(alarmOffDrawable);
}
}
// Make sure no events are received until we are ready to display them. Locking the group
// will cache any results so they can be delivered immediately when you unlock() if there are
// any available
observableGroup.lock();
if (observableGroup.hasObservable(OBSERVABLE_TAG)) {
observableGroup
.<Long>observable(OBSERVABLE_TAG)
.onBackpressureBuffer()
.observeOn(AndroidSchedulers.mainThread())
.subscribe(observer);
}
}
@Override
protected void onResume() {
super.onResume();
Log.d(TAG, "onResume()");
// Go ahead and unlock our group, so we can receive Observable events.
observableGroup.unlock();
}
private void onClickStartStopTimer(View view) {
if (!isRunning) {
Toast.makeText(this, "Started timer", Toast.LENGTH_SHORT).show();
isRunning = true;
startStop.setImageDrawable(alarmOffDrawable);
timerObservable
.compose(observableGroup.<Long>transform(OBSERVABLE_TAG))
.observeOn(AndroidSchedulers.mainThread())
.onBackpressureBuffer()
.subscribe(observer);
} else {
Toast.makeText(this, "Stopped timer", Toast.LENGTH_SHORT).show();
isRunning = false;
startStop.setImageDrawable(alarmDrawable);
observableGroup.cancelAndRemove(OBSERVABLE_TAG);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy()");
if (isFinishing()) {
// Unsubscribe Observers and clear references. No more events will be received and the
// destroyed ObservableGroup is now unusable.
observableManager.destroy(observableGroup);
} else {
// Activity is not finishing (maybe just rotating?) so just unsubscribe for now and assume
// that it will be resubscribed later
observableGroup.unsubscribe();
}
}
@Override
protected void onPause() {
super.onPause();
Log.d(TAG, "onPause()");
observableGroup.lock();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putLong(GROUP_ID, observableGroup.id());
outState.putBoolean(IS_RUNNING, isRunning);
}