I have problem with one of my games. This is time based puzzle game and I have problem with it. When user press on/off button on Android device game doesn`t stop, but timer goes on and on till game over. When user turn on screen again, he can see game over screen. But I want to make scenario when user press on/off button game will pause.
Any suggestions? I`m pretty new in programming so please explain me very basic method to do this.
Thanks all!
Edit. Timer code
private void initializeProgressBar() {
//initialize progressbar
progress = ApplicationConstants.GAME_TIME;
mProgress = (ProgressBarDetermininate) findViewById(R.id.progressDeterminate);
mProgress.setMax(progress);
mProgress.setProgress(progress );
timer = new Timer();
progressBarUpdateTask = new ProgressBarUpdateTask();
timer.schedule(progressBarUpdateTask, 20, 20);
}
class ProgressBarUpdateTask extends TimerTask {
#Override
public void run() {
runOnUiThread(new Runnable(){
#Override
public void run() {
progress-=1;
if(progress==0)
{
TimeOver();
}
mProgress.setProgress(progress);
}
});
}
#Override
protected void onResume() {
super.onResume();
}
#Override
protected void onPause() {
super.onPause();
this.timer.cancel();
}
Pause your game in onStop() or onPause() (depending on your need) in the Activity context your game is running in.
I am assuming you are using android's activity...
#Override
protected void onResume() {
super.onResume();
// Resume the timer or show a button for the user to press when ready
// !!! Also check if timer exits because onResume is called before onCreate!!!
}
#Override
protected void onPause() {
super.onPause();
// Pause the timer
}
When you press screen off or Power button onPause method of the application will be called and when you again press Power button, applications onResume method will be called, you should pause timer in onPause and resume it in onResume.
One way to do this is to detect the user presence, here's an example
At beginning of your game start the LockService
startService(new Intent(getApplicationContext(), LockService.class));
LockService.java
public class LockService extends Service {
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
final IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_USER_PRESENT);
final BroadcastReceiver mReceiver = new ScreenReceiver();
registerReceiver(mReceiver, filter);
return super.onStartCommand(intent, flags, startId);
}
public class LocalBinder extends Binder {
LockService getService() {
return LockService.this;
}
}
}
Then finally the BroadcastReceiver where you can stop your game.
ScreenReceiver.java
public class ScreenReceiver extends BroadcastReceiver {
public static boolean wasScreenOn = true;
#Override
public void onReceive(final Context context, final Intent intent) {
Log.e("LOB","onReceive");
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
// do whatever you need to do here
wasScreenOn = false;
/* PAUSE THE GAME HERE*/
Log.e("LOB","wasScreenOn"+wasScreenOn);
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
// and do whatever you need to do here
wasScreenOn = true;
}else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT)){
}
}
}
As correctly mentioned in other answers, you can also use the onPause() method
#Override
protected void onPause() {
super.onPause();
// stop the game
}
Related
My APP has 3 activities named "MainActivity", "LevelActivity" and "GameActivity". Now I want to play BGM in MainActivity and LevelActivity. When I jump from Main to Level, I don't want the music to start from the beginning. So I use Service to play BGM.
But the problem is that if I don't override onStop() in MainActivity, the BGM is still playing after I clicked the "HOME" button. But if I override onStop() in MainActivity, the BGM will stop when I jump from Main to Level.
public class MusicService extends Service {
private MediaPlayer mediaPlayer;
#Override
public void onCreate() {
// my codes...
}
#Override
public void onStart(Intent intent, int startId) {
// my codes...
}
#Override
public void onDestroy() {
if (mediaPlayer != null) {
mediaPlayer.stop();
mediaPlayer.release();
}
super.onDestroy();
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
What should I do to stop BGM when I press "HOME"?
Thanks.
you can do a trick by adding a boolean variable .
1- create a boolean variable isAppStillRunning = false
2- then when you want to start level activity make isAppStillRunning = true before startActivity()
3- whenever you go back to MainActivity make isAppStillRunning = false
now in onStop() in your MainActivity ,
if(!isAppStillRunning){
//do the proccess to stop music
}
My question here is about playing the music after the user closes the app (the app tab is not showing on the list of currently open apps).
I have created a class to handle the service that targets the media player to play the ring-tone music:
public class RingService extends Service {
private MediaPlayer player;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
player = MediaPlayer.create(this,
Settings.System.DEFAULT_RINGTONE_URI);
player.setLooping(true);
player.start();
return START_STICKY;
}
#Override
public void onDestroy() {
super.onDestroy();
player.stop();
}
}
in my MainActivity I use a button to start playing music. And it works fine till I close the app.
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
protected void onStart() {
super.onStart();
}
public void onRing(View view) {
Intent intent = new Intent(this, RingService.class);
startService(intent);
}
public void onStop(View view) {
Intent intent = new Intent(this, RingService.class);
stopService(intent);
}
}
Is there anyone who could tell me, what I'm doing wrong? I would be extremely grateful.
And just not to start another topic for this app, I will ask it here - is it possible to relaunch the activity in 10 seconds after it has been closed by the user?
I think you missed the onCreate to implement
My app is doing good with this code:
public class BackgroundMusicService extends Service {
MediaPlayer musicPlayer;
public IBinder onBind(Intent arg) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
musicPlayer = MediaPlayer.create(this, R.raw.your_music_file);
musicPlayer.setLooping(true); // Set looping
musicPlayer.setVolume(100,100);
}
public int onStartCommand(Intent intent, int flags, int startId) {
musicPlayer.start();
return 1;
}
#Override
public void onDestroy() {
musicPlayer.stop();
musicPlayer.release();
}
and in you manifest:
<service android:enabled="true" android:name=".BackgroundSoundService" />
So after closing your app you want to play some ringtone using RingService but when user close the app the onStop() method is called in your MainActivity with this code Intent intent = new Intent(this, RingService.class);
stopService(intent);. How service can play your music if you stopping your service at same time.
Try to delete this code from onStop() (not sure it will solve the problem but it worth trying).
Additionally I am recommending using Logcat for testing your code.
https://developer.android.com/studio/command-line/logcat
You need to put your service in foreground with startForeground(id, notification), check the official docs for reference.
When you have a service in foreground, the chances of your process being killed are reduced drastically because your process won't be considered as in background. The downside is that you must show a permanent notification, which in your case might even be desirable because you might need controls for the player.
I'm making an Android whack a mole game. I have the main activity which is basically the launcher, when you press the Play button the game activity starts. This works fine as it shows the background image and all molehills but I don't know how to call the method to start the game.
I've tried to call it from inside onCreate() but this ends up "playing the game" itself.
I've tried to call it right after the startActivity(intent) but the app crashes. And also I've tried to create an instance of the game class and call the play() method after the start activity but it doesn't work aswell. I don't know how to start the game method once the game activity is loaded.
I hope I explained well, thank you.
public class MainActivity extends AppCompatActivity {
ImageButton btnStart;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide TitleBar
try { this.getSupportActionBar().hide();}
catch (NullPointerException e){}
setContentView(R.layout.activity_main);
btnStart = (ImageButton)findViewById(R.id.btnStart);
btnStart.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), GameView.class);
startActivity(intent);
}
});
}
And this is the code for the game_activity
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide TitleBar
try { this.getSupportActionBar().hide();}
catch (NullPointerException e){}
setContentView(R.layout.activity_game_view);
game();
}
The game() method is a typical game loop.
public void game() {
Random random = new Random();
int index;
/*
* Casting array to store all ImageView on the game
*/
imgViewArray[0] = (ImageView)findViewById(R.id.img1);
imgViewArray[1] = (ImageView)findViewById(R.id.img2);
imgViewArray[2] = (ImageView)findViewById(R.id.img3);
imgViewArray[3] = (ImageView)findViewById(R.id.img4);
imgViewArray[4] = (ImageView)findViewById(R.id.img5);
imgViewArray[5] = (ImageView)findViewById(R.id.img6);
imgViewArray[6] = (ImageView)findViewById(R.id.img7);
imgViewArray[7] = (ImageView)findViewById(R.id.img8);
imgViewArray[8] = (ImageView)findViewById(R.id.img9);
imgViewArray[9] = (ImageView)findViewById(R.id.img10);
int j=0;
while (j < 10) {
// Get a random image to animate
index = random.nextInt(10);
switch(index) {
case 0: imgViewArray[0].setImageResource(images[6]);
new java.util.Timer().schedule(
new java.util.TimerTask() {
#Override
public void run() {
imgViewArray[0].setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
imgViewArray[0].setImageResource(images[0]);
}
});
}
},
300 // The code executes after 300ms
);
break;
I think you should put the game() call inside onResume().
There are many ways to solve the problem:
Using EventBus
Send the start game Event from Main Activity and register for the Event in the Game activity.
This is my favorite way to handle the problem. It's because the simplicity and prevent us from tightly coupled code. The major problem with using EventBus is we will lost in the sea of Event if there are too much Event in the the app.
How to do:
First, create the Event. This is just a simple class:
public class StartGameEvent {
}
Second, register for the event in the game activity:
public class GameActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
EventBus.getDefault().register(this);
}
protected void onDestroy() {
super.onDestroy();
EventBus.getDefault().unregister(this);
}
}
Third, subscribe for the event:
public class GameActivity extends Activity {
...
#Subscribe
public void onMessageEvent(StartGameEvent event) {
game();
}
}
Last, send the event from Main activity:
EventBus.getDefault().post(new StartGameEvent());
Using LocalBroadcastManager
You need to create the message and broadcast it in from your Main activity:
Intent intent = new Intent("playEvent");
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
Then, in the game activity, you need to register as receiver:
#Override
public void onCreate(Bundle savedInstanceState) {
// register for the event
LocalBroadcastManager.getInstance(this).registerReceiver(mReceiver,
new IntentFilter("playEvent"));
}
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
game();
}
};
#Override
protected void onDestroy() {
// Unregister here
LocalBroadcastManager.getInstance(this)
.unregisterReceiver(mReceiver);
super.onDestroy();
}
I slightly modifying the code from How to use LocalBroadcastManager? for your case.
Using a static method in Game activity
This is the simplest way but highly discouraged. Because we can't ensure the state of the activity. Do not use this in production code. This is for learning sake only.
You can make the game() method as a static method like this:
public class GameActivity extends Activity {
...
public static void game() {
// game logic.
}
}
Then call the method when you want with:
GameActivity.game();
I have created a service to play music through my activities. I Have 2 activities and a splashScreen. I start the service from the first acitivity and by clicking some items I go to the second activity. The music is played properly but when I put my app in background or I lock my phone or I'm in another app I still hear the sound. I cannot put stopService in onStop because if I go to my second activity, the music will stop.
Here's my service music class :
public class BackgroundMusicService extends Service {
MediaPlayer player;
public IBinder onBind(Intent arg0) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
player = MediaPlayer.create(this, R.raw.game_music);
player.setLooping(true);
player.setVolume(10, 10);
player.start();
}
public int onStartCommand(Intent intent, int flags, int startId) {
player.start();
return 1;
}
#Override
public void onDestroy() {
player.stop();
player.release();
}
#Override
public void onLowMemory() {
}
}
and :
public class Activity1 extends AppCompatActivity implements View.OnClickListener{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_1);
Intent backgSound = new Intent(Activity1.this, BackgroundMusicService.class);
startService(backgSound);
Button b1 = (Button) findViewById(R.id.b1);
b1.setOnClickListener(this);
}
#Override
public void onDestroy() {
super.onDestroy();
Intent backgSound = new Intent(Activity1.this, BackgroundMusicService.class);
stopService(backgSound);
}
#Override
public void onClick(View v) {
startActivity(new Intent(this,Activity2.class);
}
And the second activity is just a view (for test).
How could I keep the sound over these 2 activites and stop it when my app is in background or my phone is locked.
I've tried to stopService in onStop then startService in onResume, but it does not work between activities.
Judging by what you want you need a more fine grained control over the starting and stopping of your MediaPlayer object. An easy solution would be to add intent-filters and actions like so:
public class BackgroundMusicService extends Service {
public static final String ACTION_START_MUSIC = "package_name.action_start_music";
public static final String ACTION_STOP_MUSIC = "package_name.action_stop";
private MediaPlayer player;
public IBinder onBind(Intent arg0) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
player = MediaPlayer.create(this, R.raw.game_music);
player.setLooping(true);
player.setVolume(10, 10);
}
public int onStartCommand(Intent intent, int flags, int startId) {
if(intent.getAction() != null){
switch (intent.getAction()){
case ACTION_START_MUSIC :
if(!player.isPlaying()){
player.start();
}
break;
case ACTION_STOP_MUSIC :
if(player.isPlaying()) {
player.stop();
}
break;
default: break;
}
}
return START_STICKY;
}
#Override
public void onDestroy() {
player.release();
}
#Override
public void onLowMemory() {
}
}
Update your manifest :
<service android:name=".BackgroundMusicService"
android:exported="false">
<intent-filter>
<action android:name="package_name.action_start_music" />
<action android:name="package_name.action_stop" />
</intent-filter>
</service>
To use:
startService(new Intent(BackgroundMusicService.ACTION_START_MUSIC));
startService(new Intent(BackgroundMusicService.ACTION_STOP_MUSIC));
It is well known that onDestroy() is not always calling, moving your onDestroy actions to the onPause() method will work:
Note: do not count on this method being called as a place for saving data! For example, if an activity is editing data in a content provider, those edits should be committed in either onPause() or onSaveInstanceState(Bundle), not here. This method is usually implemented to free resources like threads that are associated with an activity, so that a destroyed activity does not leave such things around while the rest of its application is still running. There are situations where the system will simply kill the activity's hosting process without calling this method (or any others) in it, so it should not be used to do things that are intended to remain around after the process goes away.
More info here.
You need to read more about the basics of Android.
Regards.
I'm writing a workout app and am trying to implement a rest timer in the Train activity. CountDownTimer located within Train and is called when the user presses a start button.
public CountDownTimer createTimer(long timerDuration) {
Log.d("new timer duration:", "value: " + timerDuration);
return new CountDownTimer(timerDuration, 1000) {
#Override
public void onTick(long millisUntilFinished) {
int progress = (int) (millisUntilFinished / 1000);
secondsLeftOnTimer = progress; // update variable for rest of app to access
// Update the output text
breakTimerOutput.setText(secondsToString(progress));
}
#Override
public void onFinish() { // Play a beep on timer finish
breakTimerOutput.setText(secondsToString(timerDurationSeconds));
playAlertSound(); // TODO: Fix the delay before playing beep.
}
}.start();
}
The timer works, as long as the user stays in the Train activity. If you switch to another activity, the timer continues to run in the background (the beep still occurs), which is what I want. If you go back to the Train activity, however, the breakTimerOutput TextView is no longer updated by onTick.
How can I "reconnect" breakTimerOutput to onTick when the user re-enters the Train activity?
Here is the full code for the activity, just in case.
I would like to suggest to keep the timer inside a Service and use BroadcastReceiver to receive the tick to update the TextView in your TrainActivity.
You need to start the CountDownTimer from the Service. So in the onCreate method of your Service you need to initialize a LocalBroadcastManager.
broadcastManager = LocalBroadcastManager.getInstance(this);
So on each tick on your timer (i.e. onTick method), you might consider calling a function like this.
static final public String UPDATE_TIME = "UPDATE_TIME";
static final public String UPDATED_TIME = "UPDATED_TIME";
public void updateTextView(String time) {
Intent intent = new Intent(UPDATE_TIME);
if(time != null)
intent.putExtra(UPDATED_TIME, time);
broadcastManager.sendBroadcast(intent);
}
Now in your TrainActivity create a BroadcastReceiver.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.copa);
receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String time = intent.getStringExtra(YourService.UPDATED_TIME);
// Update your TextView here.
}
};
}
And additionally you need to register and unregister the BroadcastReceiver.
#Override
protected void onStart() {
super.onStart();
LocalBroadcastManager.getInstance(this).registerReceiver((receiver),
new IntentFilter(YourService.UPDATE_TIME)
);
}
#Override
protected void onStop() {
LocalBroadcastManager.getInstance(this).unregisterReceiver(receiver);
super.onStop();
}