Develop Reference

How to pause/play background music in MainActivity in Android?

I'm calling the service MusicaFundo in Splashscreen.class and want to pause/play it in MainActivity.class.
I'm trying with a sendBroadcast but the service is not receiving the intent, I have created the BroadcastReceiver, MyServiceReceiver, inside MusicaFundo.class, is it wrong to do like this?
MainActivity.class
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
boolean musicaTocar = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent svc = new Intent (this, MusicaFundo.class);
TextView titulo = findViewById(R.id.titulo);
final ImageView som = findViewById(R.id.som);
som.setBackgroundResource(R.drawable.volumeup);
final ImageView jogomem = findViewById(R.id.jogomem);
jogomem.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Animation diminuir = (Animation) AnimationUtils.loadAnimation(MainActivity.this, R.anim.diminuir);
jogomem.startAnimation(diminuir);
Intent jogomemoria = new Intent(MainActivity.this, JogoMemoria.class);
startActivity(jogomemoria);
}
});
Animation deslocarD = (Animation) AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);
titulo.startAnimation(deslocarD);
som.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (!musicaTocar){
som.setBackgroundResource(R.drawable.volumemut);
playMusica();
musicaTocar = true;
}
else {
if (musicaTocar){
som.setBackgroundResource(R.drawable.volumeup);
pausarMusica();
musicaTocar = false;
}
}
}
});
}
private void pausarMusica() {
Intent pausar = new Intent();
pausar.setAction("pausar");
sendBroadcast(pausar);
}
private void playMusica() {
Intent tocar = new Intent();
tocar.setAction("tocarmusica");
sendBroadcast(tocar);
}
Inside MusicaFundo.class
public class MusicaFundo extends Service {
private MediaPlayer player;
public int posatual = 0;
private static final String TAG = "MusicaFundo";
public static Object getName() {
return null;
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate(){
player = MediaPlayer.create(this, R.raw.musicafundo);
player.setLooping(true);
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
player.seekTo(posatual);
player.start();
return START_STICKY;
}
public boolean onUnbind(Intent intent){
return false;
}
#Override
public void onDestroy() {
super.onDestroy();
if (player != null) {
if (player.isPlaying()) {
player.stop();
}
player.release();
}
}
public void resumeMusic(){
if (player != null) {
if (player.isPlaying() == false) {
player.seekTo(posatual);
player.start();
}
}
}
public void onPause(){
if (player != null) {
if (player.isPlaying()) {
posatual = player.getCurrentPosition();
player.pause();
}
}
}
public class MyServiceReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
String pausa = intent.getAction();
if(pausa.equals("pausar")){
onPause();
Log.d(TAG, "onReceive: " + pausa);
}
else if(pausa.equals("tocarmusica")){
resumeMusic();
Log.d(TAG, "onReceive: " + pausa);
}
}
}
Want to receive intent so it compares the string to pause or play.

Not sure if the code is just not complete in the question but you need to call registerReceiver in your service for the receiver to actually receive broadcasts.
Also, if this is mostly communication within the same process, I suggest using LocarBroadcastManager as it is more efficient and secure.

Cannot stop timer in Android? How to solve it?

I am writing a class to control start and stop timer in Android. The controller is an Activity that will send start or stop value. In the TimerControl class, I write two functions that use to start and stop the timer. I can start the timer, but I cannot stop it. How can I solve it? This is my code
//In Controller class
//===========Start========
Intent smsTimer = new Intent(getApplicationContext(), TimmerControl.class);
smsTimer.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
smsTimer.putExtra("input_timer", "start");
getApplicationContext().startActivity(smsTimer);
//===========Stop========
Intent smsTimer = new Intent(getApplicationContext(), TimmerControl.class);
smsTimer.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
smsTimer.putExtra("input_timer", "stop");
getApplicationContext().startActivity(smsTimer);
This is my code of TimerControl
public class TimmerControl extends Activity {
private CountDownTimer timer_SMS;
private String TAG="TimmerControl";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
if (intent != null &&intent.getExtras() != null) {
Bundle bundle = intent.getExtras();
if (!bundle.getString("input_timer").equals(null)) {
String input_timer = bundle.getString("input_timer");
if(input_timer.equals("start")) {// start
startSMSTimer();
}
else if(input_timer.equals("stop")) {// stop
stopSMSTimer();
}
else{}
}
}
finish();
}
public void startSMSTimer(){
if (timer_SMS != null) {
timer_SMS.cancel();
timer_SMS = null;
}
timer_SMS = new CountDownTimer(100000, 20000) {
#Override
public void onTick(long millisUntilFinished) {
long timOver = 100000 - millisUntilFinished;
Log.d(TAG, String.valueOf(timOver));
}
#Override
public void onFinish() { }
};
timer_SMS.start();
}
public void stopSMSTimer(){
if (timer_SMS != null) {
timer_SMS.cancel();
timer_SMS = null;
}
}
}

You need to send "stop" while sending intent for stop as follows :
//In Controller class
//===========Start========
Intent smsTimer = new Intent(getApplicationContext(), TimmerControl.class);
smsTimer.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
smsTimer.putExtra("input_timer", "start"); // start
getApplicationContext().startActivity(smsTimer);
//===========Stop========
Intent smsTimer = new Intent(getApplicationContext(), TimmerControl.class);
smsTimer.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
smsTimer.putExtra("input_timer", "stop"); // stop
getApplicationContext().startActivity(smsTimer);

public class TimmerControl extends Service {
CountDownTimer timer_SMS;
private BroadcastReceiver mReceiver;
#Override
public void onCreate() {
super.onCreate();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("start");
intentFilter.addAction("stop");
mReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
//extract our message from intent
if (intent.getAction().equals("start")) {
startSMSTimer();
}
if (intent.getAction().equals("stop")) {
stopSMSTimer();
}
}
};
this.registerReceiver(mReceiver, intentFilter);
}
public int onStartCommand(Intent intent, int flags, int startId) {
return START_STICKY;
}
#Override
public void onDestroy() {
super.onDestroy();
this.unregisterReceiver(this.mReceiver);
}
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
public void startSMSTimer() {
if (timer_SMS != null) {
timer_SMS.cancel();
timer_SMS = null;
}
timer_SMS = new CountDownTimer(100000, 1000) {
#Override
public void onTick(long millisUntilFinished) {
long timOver = 100000 - millisUntilFinished;
Log.e("Time: ", ""+timOver);
}
#Override
public void onFinish() {
Log.e("finished: ","");
}
};
timer_SMS.start();
}
public void stopSMSTimer() {
if (timer_SMS != null) {
timer_SMS.cancel();
timer_SMS = null;
Log.e("Stop: ","");
}
stopSelf();
}
}
SMSControllerActivity.java
public class SMSControllerActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_smscontroller);
findViewById(R.id.btn_start).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (!isServiceRunning(TimmerControl.class))
startService(new Intent(SMSControllerActivity.this, TimmerControl.class));
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
sendBroadcast(new Intent("start"));
}
}, 500);
}
});
findViewById(R.id.btn_stop).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
sendBroadcast(new Intent("stop"));
}
});
;
}
private boolean isServiceRunning(Class<?> serviceClass) {
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
if (serviceClass.getName().equals(service.service.getClassName())) {
return true;
}
}
return false;
}
}
activity_smscontroller.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="#+id/btn_start"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="Start" />
<Button
android:id="#+id/btn_stop"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="Stop" />
</LinearLayout>

Update Android Service TextView from Activity/ Static Method

Background:
I've created a custom service as:
public class FloatingViewService extends Service {
public static FloatingViewService self;
onCreate() {
self = this;
addView(....)
}
...
...
public void updateText ( String newText) { this.textView.setText(newText) };
}
OnCreate event of this service, it sets a view using WindowManager.addView(...) and also set an instance pointer in self variable for future use.
Now this view is just a textview, that stays on the top of activities, regardless.
What I want to achieve:
I want to send some data from a static method that runs using ExecutorService instance, which should update textview text.
How I use this service:
Inside of an activity, I make a call to a static method that logs some values:
public class MyActivity: Activity
{
public void log() {
LogUtil.log(new Runnable() {
#Override
public void run() {
//log api call
FloatingViewService.self.updateText("New Text");
}
}) ;
}
}
Now you can see that I am making a call to an updateText method present in service, from different thread.
Here is how the LogUtil is:
public class LogUtil {
private static ExecutorService taskExecutorService = ThreadUtils.createTimedExecutorService(TASK_POOL_SIZE, TASK_POOL_IDLE_ALIVE_SECONDS,
TimeUnit.SECONDS, new LowPriorityThreadFactory());
public static log(Runnable runnable) {
taskExecutorService.submit(new Runnable() {
#Override
public void run() {
try {
runnable.run();
} catch (Exception ex) {
../
}
}
});
Now the problem is, it cannot update textview text. I can understand it is due to thread. But I have no clue on how to achieve it - is there any UIthread for service ?

Here is my code for example .. you shuold be able to pick the necesary parts from it. as Selvin said you have to create an Incoming handler on both sides to send information from one thread to the other...
Here is my service code
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;
import com.pekam.myandroidtheme.*;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.util.Log;
public class MyService extends Service {
private NotificationManager nm;
private Timer timer = new Timer();
private int counter = 0, incrementby = 1;
private static boolean isRunning = false;
ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
int mValue = 0; // Holds last value set by a client.
static final int MSG_REGISTER_CLIENT = 1;
static final int MSG_UNREGISTER_CLIENT = 2;
static final int MSG_SET_INT_VALUE = 3;
static final int MSG_SET_STRING_VALUE = 4;
final Messenger mMessenger = new Messenger(new IncomingHandler()); // Target we publish for clients to send messages to IncomingHandler.
#Override
public IBinder onBind(Intent intent) {
return mMessenger.getBinder();
}
class IncomingHandler extends Handler { // Handler of incoming messages from clients.
#Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_REGISTER_CLIENT:
mClients.add(msg.replyTo);
break;
case MSG_UNREGISTER_CLIENT:
mClients.remove(msg.replyTo);
break;
case MSG_SET_INT_VALUE:
incrementby = msg.arg1;
break;
default:
super.handleMessage(msg);
}
}
}
private void sendMessageToUI(int intvaluetosend) {
for (int i=mClients.size()-1; i>=0; i--) {
try {
// Send data as an Integer
mClients.get(i).send(Message.obtain(null, MSG_SET_INT_VALUE, intvaluetosend, 0));
//Send data as a String
Bundle b = new Bundle();
b.putString("str1", "ab" + intvaluetosend + "cd");
Message msg = Message.obtain(null, MSG_SET_STRING_VALUE);
msg.setData(b);
mClients.get(i).send(msg);
} catch (RemoteException e) {
// The client is dead. Remove it from the list; we are going through the list from back to front so this is safe to do inside the loop.
mClients.remove(i);
}
}
}
#Override
public void onCreate() {
super.onCreate();
Log.i("MyService", "Service Started.");
showNotification();
timer.scheduleAtFixedRate(new TimerTask(){ public void run() {onTimerTick();}}, 0, 100L);
isRunning = true;
}
private void showNotification() {
nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
// In this sample, we'll use the same text for the ticker and the expanded notification
CharSequence text = getText(R.string.service_started);
// Set the icon, scrolling text and timestamp
Notification notification = new Notification(R.drawable.ic_launcher, text, System.currentTimeMillis());
// The PendingIntent to launch our activity if the user selects this notification
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, TabBarActivity.class), 0);
// Set the info for the views that show in the notification panel.
notification.setLatestEventInfo(this, getText(R.string.service_label), text, contentIntent);
// Send the notification.
// We use a layout id because it is a unique number. We use it later to cancel.
nm.notify(R.string.service_started, notification);
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("MyService", "Received start id " + startId + ": " + intent);
return START_STICKY; // run until explicitly stopped.
}
public static boolean isRunning()
{
return isRunning;
}
private void onTimerTick() {
Log.i("TimerTick", "Timer doing work." + counter);
try {
counter += incrementby;
sendMessageToUI(counter);
} catch (Throwable t) { //you should always ultimately catch all exceptions in timer tasks.
Log.e("TimerTick", "Timer Tick Failed.", t);
}
}
#Override
public void onDestroy() {
super.onDestroy();
if (timer != null) {timer.cancel();}
counter=0;
nm.cancel(R.string.service_started); // Cancel the persistent notification.
Log.i("MyService", "Service Stopped.");
isRunning = false;
}
}
here is my android form app code
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import com.pekam.myandroidtheme.*;
public class MyServiceControllerActivity extends Activity {
Button btnStart, btnStop, btnBind, btnUnbind, btnUpby1, btnUpby10;
TextView textStatus, textIntValue, textStrValue;
Messenger mService = null;
boolean mIsBound;
final Messenger mMessenger = new Messenger(new IncomingHandler());
class IncomingHandler extends Handler {
#Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MyService.MSG_SET_INT_VALUE:
textIntValue.setText("Int Message: " + msg.arg1);
break;
case MyService.MSG_SET_STRING_VALUE:
String str1 = msg.getData().getString("str1");
textStrValue.setText("Str Message: " + str1);
break;
default:
super.handleMessage(msg);
}
}
}
private ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
mService = new Messenger(service);
textStatus.setText("Attached.");
try {
Message msg = Message.obtain(null, MyService.MSG_REGISTER_CLIENT);
msg.replyTo = mMessenger;
mService.send(msg);
} catch (RemoteException e) {
// In this case the service has crashed before we could even do anything with it
}
}
public void onServiceDisconnected(ComponentName className) {
// This is called when the connection with the service has been unexpectedly disconnected - process crashed.
mService = null;
textStatus.setText("Disconnected.");
}
};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.exampleservice);
btnStart = (Button)findViewById(R.id.btnStart);
btnStop = (Button)findViewById(R.id.btnStop);
btnBind = (Button)findViewById(R.id.btnBind);
btnUnbind = (Button)findViewById(R.id.btnUnbind);
textStatus = (TextView)findViewById(R.id.textStatus);
textIntValue = (TextView)findViewById(R.id.textIntValue);
textStrValue = (TextView)findViewById(R.id.textStrValue);
btnUpby1 = (Button)findViewById(R.id.btnUpby1);
btnUpby10 = (Button)findViewById(R.id.btnUpby10);
btnStart.setOnClickListener(btnStartListener);
btnStop.setOnClickListener(btnStopListener);
btnBind.setOnClickListener(btnBindListener);
btnUnbind.setOnClickListener(btnUnbindListener);
btnUpby1.setOnClickListener(btnUpby1Listener);
btnUpby10.setOnClickListener(btnUpby10Listener);
restoreMe(savedInstanceState);
CheckIfServiceIsRunning();
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString("textStatus", textStatus.getText().toString());
outState.putString("textIntValue", textIntValue.getText().toString());
outState.putString("textStrValue", textStrValue.getText().toString());
}
private void restoreMe(Bundle state) {
if (state!=null) {
textStatus.setText(state.getString("textStatus"));
textIntValue.setText(state.getString("textIntValue"));
textStrValue.setText(state.getString("textStrValue"));
}
}
private void CheckIfServiceIsRunning() {
//If the service is running when the activity starts, we want to automatically bind to it.
if (MyService.isRunning()) {
doBindService();
}
}
private OnClickListener btnStartListener = new OnClickListener() {
public void onClick(View v){
startService(new Intent(MyServiceControllerActivity.this, MyService.class));
}
};
private OnClickListener btnStopListener = new OnClickListener() {
public void onClick(View v){
doUnbindService();
stopService(new Intent(MyServiceControllerActivity.this, MyService.class));
}
};
private OnClickListener btnBindListener = new OnClickListener() {
public void onClick(View v){
doBindService();
}
};
private OnClickListener btnUnbindListener = new OnClickListener() {
public void onClick(View v){
doUnbindService();
}
};
private OnClickListener btnUpby1Listener = new OnClickListener() {
public void onClick(View v){
sendMessageToService(1);
}
};
private OnClickListener btnUpby10Listener = new OnClickListener() {
public void onClick(View v){
sendMessageToService(10);
}
};
private void sendMessageToService(int intvaluetosend) {
if (mIsBound) {
if (mService != null) {
try {
Message msg = Message.obtain(null, MyService.MSG_SET_INT_VALUE, intvaluetosend, 0);
msg.replyTo = mMessenger;
mService.send(msg);
} catch (RemoteException e) {
}
}
}
}
void doBindService() {
bindService(new Intent(this, MyService.class), mConnection, Context.BIND_AUTO_CREATE);
mIsBound = true;
textStatus.setText("Binding.");
}
void doUnbindService() {
if (mIsBound) {
// If we have received the service, and hence registered with it, then now is the time to unregister.
if (mService != null) {
try {
Message msg = Message.obtain(null, MyService.MSG_UNREGISTER_CLIENT);
msg.replyTo = mMessenger;
mService.send(msg);
} catch (RemoteException e) {
// There is nothing special we need to do if the service has crashed.
}
}
// Detach our existing connection.
unbindService(mConnection);
mIsBound = false;
textStatus.setText("Unbinding.");
}
}
#Override
protected void onDestroy() {
super.onDestroy();
try {
doUnbindService();
} catch (Throwable t) {
Log.e("TabBarActivity", "Failed to unbind from the service", t);
}
}
}

You need to stay on UIThread to update UI. A solution may be:
Create a static reference of activity. Remember to set it on resume method of activity and to unset it on pause method.
On the service side you can invoke a method of activiy to update UI.
Translating those operations in pseudocode. The activity will become :
public class MainActivity extends Activity {
public static MainActivity reference;
...
public onResume() {
reference=this;
}
public onPause() {
reference=null;
}
public void needToUpdateText(final String text)
{
runOnUiThread(new Runnable() {
public void run() {
Log.d("UI thread", "I am the UI thread with text "+text);
});
}
}
}
And the service class:
public class FloatingViewService extends Service {
...
public void updateText ( String newText)
{
if (MainActivity.reference!=null)
{
MainActivity.reference.needUpdateText(newText);
}
};
}

continue service working when the application closes

I have a simple Service
public class UpdateService extends Service {
private int seconds;
final static String MY_ACTION = "MY_ACTION";
#Override
public void onCreate() {
super.onCreate();
}
#Override
public void onStart(Intent intent, int startId) {
timer.start();
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
final CountDownTimer timer = new CountDownTimer(86400000, 1000) {
public void onTick(long millisUntilFinished) {
Util.saveInfo(getApplicationContext(), Util.SECONDS, seconds++);
Intent intent = new Intent();
intent.setAction(MY_ACTION);
sendBroadcast(intent);
}
public void onFinish() { }
};
}
When I close an application service stops working. But showing that the service is running.
What am I doing wrong?
Update
I changed CountDownTimer to Thread, but the problem remained
Thread t1 = new Thread(new Runnable() {
#Override
public void run() {
while (true) {
Util.saveInfo(getApplicationContext(), Util.SECONDS, seconds++);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
OnStart()
if(!t1.isAlive())
t1.start();

Because CountDown Timer is working only foreground means app is running and not minimized or closed. You have to place a Thread in Service that executing at particular time of you want.
try this :
public class LocalService extends Service
{
private static Timer timer = new Timer();
private Context ctx;
public IBinder onBind(Intent arg0)
{
return null;
}
public void onCreate()
{
super.onCreate();
ctx = this;
startService();
}
private void startService()
{
timer.scheduleAtFixedRate(new mainTask(), 0, 5000);
}
private class mainTask extends TimerTask
{
public void run()
{
toastHandler.sendEmptyMessage(0);
}
}
public void onDestroy()
{
super.onDestroy();
Toast.makeText(this, "Service Stopped ...", Toast.LENGTH_SHORT).show();
}
private final Handler toastHandler = new Handler()
{
#Override
public void handleMessage(Message msg)
{
System.out.println("test");
}
};
}

How to show toast message after a period of time in android?

I am showing toast message after every 20 seconds from current time but if I going out the app it is not working. Here is my code:
public class Main extends Activity {
final static private long ONE_SECOND = 1000;
final static private long TWENTY_SECONDS = ONE_SECOND * 20;
PendingIntent pi;
BroadcastReceiver br;
AlarmManager am;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
br = new BroadcastReceiver() {
#Override
public void onReceive(Context c, Intent i) {
Toast.makeText(c, "Rise and Shine!", Toast.LENGTH_LONG).show();
Log.i("Receive message in every five seconds", "message");
}
};
registerReceiver(br, new IntentFilter("com.authorwjf.wakeywakey"));
pi = PendingIntent.getBroadcast(this, 0, new Intent(
"com.authorwjf.wakeywakey"), 0);
am = (AlarmManager) (this.getSystemService(Context.ALARM_SERVICE));
am.setRepeating(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime(),
TWENTY_SECONDS, pi);
}
#Override
protected void onDestroy() {
am.cancel(pi);
unregisterReceiver(br);
super.onDestroy();
}
}
My question is if the app is not running but still it can show toast message? How can it possible in android?

you must create a Class Updater which contain a Handler
it will be executed periodically (you can define this periode) like that:
import android.os.Handler;
public class Updater {
private Handler mHandler = new Handler();
private Runnable mStatusChecker;
final static private long TWENTY_SECONDS = 20000;
private int UPDATE_INTERVAL = TWENTY_SECONDS;
public Updater(final Runnable updater){
mStatusChecker = new Runnable() {
#Override
public void run() {
updater.run();
mHandler.postDelayed(this, UPDATE_INTERVAL);
}
};
}
public Updater(Runnable updater, int interval){
this(updater);
UPDATE_INTERVAL = interval;
}
public void startUpdates(){
mStatusChecker.run();
}
public void stopUpdates(){
mHandler.removeCallbacks(mStatusChecker);
}}
than create a service "ServiceOn" :
public class ServiceOn extends Service {
Updater updater = new Updater(new Runnable() {
#Override
public void run() {
// put your code here
// toast or what you want
}});
#Override
public IBinder onBind(Intent arg0)
{
return null;
}
#Override
public void onCreate()
{
updater.startUpdates();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId)
{
return super.onStartCommand(intent, flags, startId);
}
#Override
public void onDestroy()
{
updater.stopUpdates();
super.onDestroy();
}}
and finally in your activity you can call this service:
context.startService(new Intent(context, ServiceOn.class));
this will work for every 20 seconds even if the app stop running

Try This Code i hope its working...
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Handler h=new Handler();
final Runnable r=new Runnable() {
public void run() {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(),"Example OF Practicle 8",Toast.LENGTH_SHORT).show();
}
};
Timer t=new Timer();
t.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
// TODO Auto-generated method stub
h.post(r);
}
},2000, 5000);

You can use setTimeout
setTimeout( function(){
toastr.clear(); // User to Clear the Toast Message Popup
}, 1000 ); // We can set our own time interval to disappear the popup
Hope it will help you