How to check whether a activity is foreground and bring it to background when it is foreground?
I hope to define whether a activity is foreground in Android, and bring it to background when it is foreground. How can I do it?
You know the <uses-permission android:name="android.permission.GET_TASKS"/>
is Deprecated!
Sample Code
private boolean isTopActivity(String activityName){
ActivityManager manager = (ActivityManager) mContext.getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);
String cmpNameTemp = null;
if(runningTaskInfos != null){
cmpNameTemp = runningTaskInfos.get(0).topActivity.toString();
}
if(cmpNameTemp == null){
return false;
}
return cmpNameTemp.equals(activityName);
}
android android-studio
add a comment |
I hope to define whether a activity is foreground in Android, and bring it to background when it is foreground. How can I do it?
You know the <uses-permission android:name="android.permission.GET_TASKS"/>
is Deprecated!
Sample Code
private boolean isTopActivity(String activityName){
ActivityManager manager = (ActivityManager) mContext.getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);
String cmpNameTemp = null;
if(runningTaskInfos != null){
cmpNameTemp = runningTaskInfos.get(0).topActivity.toString();
}
if(cmpNameTemp == null){
return false;
}
return cmpNameTemp.equals(activityName);
}
android android-studio
add a comment |
I hope to define whether a activity is foreground in Android, and bring it to background when it is foreground. How can I do it?
You know the <uses-permission android:name="android.permission.GET_TASKS"/>
is Deprecated!
Sample Code
private boolean isTopActivity(String activityName){
ActivityManager manager = (ActivityManager) mContext.getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);
String cmpNameTemp = null;
if(runningTaskInfos != null){
cmpNameTemp = runningTaskInfos.get(0).topActivity.toString();
}
if(cmpNameTemp == null){
return false;
}
return cmpNameTemp.equals(activityName);
}
android android-studio
I hope to define whether a activity is foreground in Android, and bring it to background when it is foreground. How can I do it?
You know the <uses-permission android:name="android.permission.GET_TASKS"/>
is Deprecated!
Sample Code
private boolean isTopActivity(String activityName){
ActivityManager manager = (ActivityManager) mContext.getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);
String cmpNameTemp = null;
if(runningTaskInfos != null){
cmpNameTemp = runningTaskInfos.get(0).topActivity.toString();
}
if(cmpNameTemp == null){
return false;
}
return cmpNameTemp.equals(activityName);
}
android android-studio
android android-studio
edited Nov 27 '18 at 2:32
HelloCW
asked Nov 27 '18 at 1:55
HelloCWHelloCW
27542898
27542898
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
this is supported natively by the Activity lifecycle which is onResume
, which will be called after the activity comes in the foreground.
public void onResume() {
// do here what you need
}
Thanks! but I need to do it outside the Activity.
– HelloCW
Nov 27 '18 at 2:32
1
that is easy using the EventBus or the Observable
– Khalid Taha
Nov 27 '18 at 2:32
@KhalidTaha, could you please provide some examples using EventBus or Observable?
– shizhen
Nov 27 '18 at 2:37
Sure, this is a tutorial of EventBus: code.tutsplus.com/articles/…
– Khalid Taha
Nov 27 '18 at 2:39
Thanks! How to get the foreground activity ? could you show me some sample code?
– HelloCW
Nov 27 '18 at 3:01
|
show 1 more comment
Put below code in a file in your application
public class Foreground implements Application.ActivityLifecycleCallbacks {
public static final long CHECK_DELAY = 500;
public static final String TAG = Foreground.class.getName();
public interface Listener {
public void onBecameForeground();
public void onBecameBackground();
}
private static Foreground instance;
private boolean foreground = false, paused = true;
private Handler handler = new Handler();
private List<Listener> listeners = new CopyOnWriteArrayList<Listener>();
private Runnable check;
/**
* Its not strictly necessary to use this method - _usually_ invoking
* get with a Context gives us a path to retrieve the Application and
* initialise, but sometimes (e.g. in test harness) the ApplicationContext
* is != the Application, and the docs make no guarantees.
*
* @param application
* @return an initialised Foreground instance
*/
public static Foreground init(Application application) {
if (instance == null) {
instance = new Foreground();
application.registerActivityLifecycleCallbacks(instance);
}
return instance;
}
public static Foreground get(Application application) {
if (instance == null) {
init(application);
}
return instance;
}
public static Foreground get(Context ctx) {
if (instance == null) {
Context appCtx = ctx.getApplicationContext();
if (appCtx instanceof Application) {
init((Application) appCtx);
}
throw new IllegalStateException(
"Foreground is not initialised and " +
"cannot obtain the Application object");
}
return instance;
}
public static Foreground get() {
if (instance == null) {
throw new IllegalStateException(
"Foreground is not initialised - invoke " +
"at least once with parameterised init/get");
}
return instance;
}
public boolean isForeground() {
return foreground;
}
public boolean isBackground() {
return !foreground;
}
public void addListener(Listener listener) {
listeners.add(listener);
}
public void removeListener(Listener listener) {
listeners.remove(listener);
}
@Override
public void onActivityResumed(Activity activity) {
paused = false;
boolean wasBackground = !foreground;
foreground = true;
if (check != null)
handler.removeCallbacks(check);
if (wasBackground) {
Log.i(TAG, "went foreground");
for (Listener l : listeners) {
try {
l.onBecameForeground();
} catch (Exception exc) {
Log.e(TAG, "Listener threw exception!", exc);
}
}
} else {
Log.i(TAG, "still foreground");
}
}
@Override
public void onActivityPaused(Activity activity) {
paused = true;
if (check != null)
handler.removeCallbacks(check);
handler.postDelayed(check = new Runnable() {
@Override
public void run() {
if (foreground && paused) {
foreground = false;
Log.i(TAG, "went background");
for (Listener l : listeners) {
try {
l.onBecameBackground();
Intent intent = getPackageManager().getLaunchIntentForPackage("com.package.name");
if (intent != null) {
// We found the activity now start the activity
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
} else {
// Bring user to the market or let them choose an app?
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id=" + "com.package.name"));
startActivity(intent);
}
} catch (Exception exc) {
Log.e(TAG, "Listener threw exception!", exc);
}
}
} else {
Log.i(TAG, "still foreground");
}
}
}, CHECK_DELAY);
}
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
Now in onCreate method of Application.class put the code:
@Override
public void onCreate() {
super.onCreate();
Foreground.init(this);
}
You can now use Foreground.isBackground()
to get application is in background or not.
You can even perform specific task in one of the overridden lifecycle methods (onActivityPaused, onActivityStopped etc)
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53491673%2fhow-to-check-whether-a-activity-is-foreground-and-bring-it-to-background-when-it%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
this is supported natively by the Activity lifecycle which is onResume
, which will be called after the activity comes in the foreground.
public void onResume() {
// do here what you need
}
Thanks! but I need to do it outside the Activity.
– HelloCW
Nov 27 '18 at 2:32
1
that is easy using the EventBus or the Observable
– Khalid Taha
Nov 27 '18 at 2:32
@KhalidTaha, could you please provide some examples using EventBus or Observable?
– shizhen
Nov 27 '18 at 2:37
Sure, this is a tutorial of EventBus: code.tutsplus.com/articles/…
– Khalid Taha
Nov 27 '18 at 2:39
Thanks! How to get the foreground activity ? could you show me some sample code?
– HelloCW
Nov 27 '18 at 3:01
|
show 1 more comment
this is supported natively by the Activity lifecycle which is onResume
, which will be called after the activity comes in the foreground.
public void onResume() {
// do here what you need
}
Thanks! but I need to do it outside the Activity.
– HelloCW
Nov 27 '18 at 2:32
1
that is easy using the EventBus or the Observable
– Khalid Taha
Nov 27 '18 at 2:32
@KhalidTaha, could you please provide some examples using EventBus or Observable?
– shizhen
Nov 27 '18 at 2:37
Sure, this is a tutorial of EventBus: code.tutsplus.com/articles/…
– Khalid Taha
Nov 27 '18 at 2:39
Thanks! How to get the foreground activity ? could you show me some sample code?
– HelloCW
Nov 27 '18 at 3:01
|
show 1 more comment
this is supported natively by the Activity lifecycle which is onResume
, which will be called after the activity comes in the foreground.
public void onResume() {
// do here what you need
}
this is supported natively by the Activity lifecycle which is onResume
, which will be called after the activity comes in the foreground.
public void onResume() {
// do here what you need
}
answered Nov 27 '18 at 2:03
Khalid TahaKhalid Taha
1,89411531
1,89411531
Thanks! but I need to do it outside the Activity.
– HelloCW
Nov 27 '18 at 2:32
1
that is easy using the EventBus or the Observable
– Khalid Taha
Nov 27 '18 at 2:32
@KhalidTaha, could you please provide some examples using EventBus or Observable?
– shizhen
Nov 27 '18 at 2:37
Sure, this is a tutorial of EventBus: code.tutsplus.com/articles/…
– Khalid Taha
Nov 27 '18 at 2:39
Thanks! How to get the foreground activity ? could you show me some sample code?
– HelloCW
Nov 27 '18 at 3:01
|
show 1 more comment
Thanks! but I need to do it outside the Activity.
– HelloCW
Nov 27 '18 at 2:32
1
that is easy using the EventBus or the Observable
– Khalid Taha
Nov 27 '18 at 2:32
@KhalidTaha, could you please provide some examples using EventBus or Observable?
– shizhen
Nov 27 '18 at 2:37
Sure, this is a tutorial of EventBus: code.tutsplus.com/articles/…
– Khalid Taha
Nov 27 '18 at 2:39
Thanks! How to get the foreground activity ? could you show me some sample code?
– HelloCW
Nov 27 '18 at 3:01
Thanks! but I need to do it outside the Activity.
– HelloCW
Nov 27 '18 at 2:32
Thanks! but I need to do it outside the Activity.
– HelloCW
Nov 27 '18 at 2:32
1
1
that is easy using the EventBus or the Observable
– Khalid Taha
Nov 27 '18 at 2:32
that is easy using the EventBus or the Observable
– Khalid Taha
Nov 27 '18 at 2:32
@KhalidTaha, could you please provide some examples using EventBus or Observable?
– shizhen
Nov 27 '18 at 2:37
@KhalidTaha, could you please provide some examples using EventBus or Observable?
– shizhen
Nov 27 '18 at 2:37
Sure, this is a tutorial of EventBus: code.tutsplus.com/articles/…
– Khalid Taha
Nov 27 '18 at 2:39
Sure, this is a tutorial of EventBus: code.tutsplus.com/articles/…
– Khalid Taha
Nov 27 '18 at 2:39
Thanks! How to get the foreground activity ? could you show me some sample code?
– HelloCW
Nov 27 '18 at 3:01
Thanks! How to get the foreground activity ? could you show me some sample code?
– HelloCW
Nov 27 '18 at 3:01
|
show 1 more comment
Put below code in a file in your application
public class Foreground implements Application.ActivityLifecycleCallbacks {
public static final long CHECK_DELAY = 500;
public static final String TAG = Foreground.class.getName();
public interface Listener {
public void onBecameForeground();
public void onBecameBackground();
}
private static Foreground instance;
private boolean foreground = false, paused = true;
private Handler handler = new Handler();
private List<Listener> listeners = new CopyOnWriteArrayList<Listener>();
private Runnable check;
/**
* Its not strictly necessary to use this method - _usually_ invoking
* get with a Context gives us a path to retrieve the Application and
* initialise, but sometimes (e.g. in test harness) the ApplicationContext
* is != the Application, and the docs make no guarantees.
*
* @param application
* @return an initialised Foreground instance
*/
public static Foreground init(Application application) {
if (instance == null) {
instance = new Foreground();
application.registerActivityLifecycleCallbacks(instance);
}
return instance;
}
public static Foreground get(Application application) {
if (instance == null) {
init(application);
}
return instance;
}
public static Foreground get(Context ctx) {
if (instance == null) {
Context appCtx = ctx.getApplicationContext();
if (appCtx instanceof Application) {
init((Application) appCtx);
}
throw new IllegalStateException(
"Foreground is not initialised and " +
"cannot obtain the Application object");
}
return instance;
}
public static Foreground get() {
if (instance == null) {
throw new IllegalStateException(
"Foreground is not initialised - invoke " +
"at least once with parameterised init/get");
}
return instance;
}
public boolean isForeground() {
return foreground;
}
public boolean isBackground() {
return !foreground;
}
public void addListener(Listener listener) {
listeners.add(listener);
}
public void removeListener(Listener listener) {
listeners.remove(listener);
}
@Override
public void onActivityResumed(Activity activity) {
paused = false;
boolean wasBackground = !foreground;
foreground = true;
if (check != null)
handler.removeCallbacks(check);
if (wasBackground) {
Log.i(TAG, "went foreground");
for (Listener l : listeners) {
try {
l.onBecameForeground();
} catch (Exception exc) {
Log.e(TAG, "Listener threw exception!", exc);
}
}
} else {
Log.i(TAG, "still foreground");
}
}
@Override
public void onActivityPaused(Activity activity) {
paused = true;
if (check != null)
handler.removeCallbacks(check);
handler.postDelayed(check = new Runnable() {
@Override
public void run() {
if (foreground && paused) {
foreground = false;
Log.i(TAG, "went background");
for (Listener l : listeners) {
try {
l.onBecameBackground();
Intent intent = getPackageManager().getLaunchIntentForPackage("com.package.name");
if (intent != null) {
// We found the activity now start the activity
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
} else {
// Bring user to the market or let them choose an app?
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id=" + "com.package.name"));
startActivity(intent);
}
} catch (Exception exc) {
Log.e(TAG, "Listener threw exception!", exc);
}
}
} else {
Log.i(TAG, "still foreground");
}
}
}, CHECK_DELAY);
}
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
Now in onCreate method of Application.class put the code:
@Override
public void onCreate() {
super.onCreate();
Foreground.init(this);
}
You can now use Foreground.isBackground()
to get application is in background or not.
You can even perform specific task in one of the overridden lifecycle methods (onActivityPaused, onActivityStopped etc)
add a comment |
Put below code in a file in your application
public class Foreground implements Application.ActivityLifecycleCallbacks {
public static final long CHECK_DELAY = 500;
public static final String TAG = Foreground.class.getName();
public interface Listener {
public void onBecameForeground();
public void onBecameBackground();
}
private static Foreground instance;
private boolean foreground = false, paused = true;
private Handler handler = new Handler();
private List<Listener> listeners = new CopyOnWriteArrayList<Listener>();
private Runnable check;
/**
* Its not strictly necessary to use this method - _usually_ invoking
* get with a Context gives us a path to retrieve the Application and
* initialise, but sometimes (e.g. in test harness) the ApplicationContext
* is != the Application, and the docs make no guarantees.
*
* @param application
* @return an initialised Foreground instance
*/
public static Foreground init(Application application) {
if (instance == null) {
instance = new Foreground();
application.registerActivityLifecycleCallbacks(instance);
}
return instance;
}
public static Foreground get(Application application) {
if (instance == null) {
init(application);
}
return instance;
}
public static Foreground get(Context ctx) {
if (instance == null) {
Context appCtx = ctx.getApplicationContext();
if (appCtx instanceof Application) {
init((Application) appCtx);
}
throw new IllegalStateException(
"Foreground is not initialised and " +
"cannot obtain the Application object");
}
return instance;
}
public static Foreground get() {
if (instance == null) {
throw new IllegalStateException(
"Foreground is not initialised - invoke " +
"at least once with parameterised init/get");
}
return instance;
}
public boolean isForeground() {
return foreground;
}
public boolean isBackground() {
return !foreground;
}
public void addListener(Listener listener) {
listeners.add(listener);
}
public void removeListener(Listener listener) {
listeners.remove(listener);
}
@Override
public void onActivityResumed(Activity activity) {
paused = false;
boolean wasBackground = !foreground;
foreground = true;
if (check != null)
handler.removeCallbacks(check);
if (wasBackground) {
Log.i(TAG, "went foreground");
for (Listener l : listeners) {
try {
l.onBecameForeground();
} catch (Exception exc) {
Log.e(TAG, "Listener threw exception!", exc);
}
}
} else {
Log.i(TAG, "still foreground");
}
}
@Override
public void onActivityPaused(Activity activity) {
paused = true;
if (check != null)
handler.removeCallbacks(check);
handler.postDelayed(check = new Runnable() {
@Override
public void run() {
if (foreground && paused) {
foreground = false;
Log.i(TAG, "went background");
for (Listener l : listeners) {
try {
l.onBecameBackground();
Intent intent = getPackageManager().getLaunchIntentForPackage("com.package.name");
if (intent != null) {
// We found the activity now start the activity
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
} else {
// Bring user to the market or let them choose an app?
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id=" + "com.package.name"));
startActivity(intent);
}
} catch (Exception exc) {
Log.e(TAG, "Listener threw exception!", exc);
}
}
} else {
Log.i(TAG, "still foreground");
}
}
}, CHECK_DELAY);
}
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
Now in onCreate method of Application.class put the code:
@Override
public void onCreate() {
super.onCreate();
Foreground.init(this);
}
You can now use Foreground.isBackground()
to get application is in background or not.
You can even perform specific task in one of the overridden lifecycle methods (onActivityPaused, onActivityStopped etc)
add a comment |
Put below code in a file in your application
public class Foreground implements Application.ActivityLifecycleCallbacks {
public static final long CHECK_DELAY = 500;
public static final String TAG = Foreground.class.getName();
public interface Listener {
public void onBecameForeground();
public void onBecameBackground();
}
private static Foreground instance;
private boolean foreground = false, paused = true;
private Handler handler = new Handler();
private List<Listener> listeners = new CopyOnWriteArrayList<Listener>();
private Runnable check;
/**
* Its not strictly necessary to use this method - _usually_ invoking
* get with a Context gives us a path to retrieve the Application and
* initialise, but sometimes (e.g. in test harness) the ApplicationContext
* is != the Application, and the docs make no guarantees.
*
* @param application
* @return an initialised Foreground instance
*/
public static Foreground init(Application application) {
if (instance == null) {
instance = new Foreground();
application.registerActivityLifecycleCallbacks(instance);
}
return instance;
}
public static Foreground get(Application application) {
if (instance == null) {
init(application);
}
return instance;
}
public static Foreground get(Context ctx) {
if (instance == null) {
Context appCtx = ctx.getApplicationContext();
if (appCtx instanceof Application) {
init((Application) appCtx);
}
throw new IllegalStateException(
"Foreground is not initialised and " +
"cannot obtain the Application object");
}
return instance;
}
public static Foreground get() {
if (instance == null) {
throw new IllegalStateException(
"Foreground is not initialised - invoke " +
"at least once with parameterised init/get");
}
return instance;
}
public boolean isForeground() {
return foreground;
}
public boolean isBackground() {
return !foreground;
}
public void addListener(Listener listener) {
listeners.add(listener);
}
public void removeListener(Listener listener) {
listeners.remove(listener);
}
@Override
public void onActivityResumed(Activity activity) {
paused = false;
boolean wasBackground = !foreground;
foreground = true;
if (check != null)
handler.removeCallbacks(check);
if (wasBackground) {
Log.i(TAG, "went foreground");
for (Listener l : listeners) {
try {
l.onBecameForeground();
} catch (Exception exc) {
Log.e(TAG, "Listener threw exception!", exc);
}
}
} else {
Log.i(TAG, "still foreground");
}
}
@Override
public void onActivityPaused(Activity activity) {
paused = true;
if (check != null)
handler.removeCallbacks(check);
handler.postDelayed(check = new Runnable() {
@Override
public void run() {
if (foreground && paused) {
foreground = false;
Log.i(TAG, "went background");
for (Listener l : listeners) {
try {
l.onBecameBackground();
Intent intent = getPackageManager().getLaunchIntentForPackage("com.package.name");
if (intent != null) {
// We found the activity now start the activity
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
} else {
// Bring user to the market or let them choose an app?
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id=" + "com.package.name"));
startActivity(intent);
}
} catch (Exception exc) {
Log.e(TAG, "Listener threw exception!", exc);
}
}
} else {
Log.i(TAG, "still foreground");
}
}
}, CHECK_DELAY);
}
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
Now in onCreate method of Application.class put the code:
@Override
public void onCreate() {
super.onCreate();
Foreground.init(this);
}
You can now use Foreground.isBackground()
to get application is in background or not.
You can even perform specific task in one of the overridden lifecycle methods (onActivityPaused, onActivityStopped etc)
Put below code in a file in your application
public class Foreground implements Application.ActivityLifecycleCallbacks {
public static final long CHECK_DELAY = 500;
public static final String TAG = Foreground.class.getName();
public interface Listener {
public void onBecameForeground();
public void onBecameBackground();
}
private static Foreground instance;
private boolean foreground = false, paused = true;
private Handler handler = new Handler();
private List<Listener> listeners = new CopyOnWriteArrayList<Listener>();
private Runnable check;
/**
* Its not strictly necessary to use this method - _usually_ invoking
* get with a Context gives us a path to retrieve the Application and
* initialise, but sometimes (e.g. in test harness) the ApplicationContext
* is != the Application, and the docs make no guarantees.
*
* @param application
* @return an initialised Foreground instance
*/
public static Foreground init(Application application) {
if (instance == null) {
instance = new Foreground();
application.registerActivityLifecycleCallbacks(instance);
}
return instance;
}
public static Foreground get(Application application) {
if (instance == null) {
init(application);
}
return instance;
}
public static Foreground get(Context ctx) {
if (instance == null) {
Context appCtx = ctx.getApplicationContext();
if (appCtx instanceof Application) {
init((Application) appCtx);
}
throw new IllegalStateException(
"Foreground is not initialised and " +
"cannot obtain the Application object");
}
return instance;
}
public static Foreground get() {
if (instance == null) {
throw new IllegalStateException(
"Foreground is not initialised - invoke " +
"at least once with parameterised init/get");
}
return instance;
}
public boolean isForeground() {
return foreground;
}
public boolean isBackground() {
return !foreground;
}
public void addListener(Listener listener) {
listeners.add(listener);
}
public void removeListener(Listener listener) {
listeners.remove(listener);
}
@Override
public void onActivityResumed(Activity activity) {
paused = false;
boolean wasBackground = !foreground;
foreground = true;
if (check != null)
handler.removeCallbacks(check);
if (wasBackground) {
Log.i(TAG, "went foreground");
for (Listener l : listeners) {
try {
l.onBecameForeground();
} catch (Exception exc) {
Log.e(TAG, "Listener threw exception!", exc);
}
}
} else {
Log.i(TAG, "still foreground");
}
}
@Override
public void onActivityPaused(Activity activity) {
paused = true;
if (check != null)
handler.removeCallbacks(check);
handler.postDelayed(check = new Runnable() {
@Override
public void run() {
if (foreground && paused) {
foreground = false;
Log.i(TAG, "went background");
for (Listener l : listeners) {
try {
l.onBecameBackground();
Intent intent = getPackageManager().getLaunchIntentForPackage("com.package.name");
if (intent != null) {
// We found the activity now start the activity
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
} else {
// Bring user to the market or let them choose an app?
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id=" + "com.package.name"));
startActivity(intent);
}
} catch (Exception exc) {
Log.e(TAG, "Listener threw exception!", exc);
}
}
} else {
Log.i(TAG, "still foreground");
}
}
}, CHECK_DELAY);
}
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
Now in onCreate method of Application.class put the code:
@Override
public void onCreate() {
super.onCreate();
Foreground.init(this);
}
You can now use Foreground.isBackground()
to get application is in background or not.
You can even perform specific task in one of the overridden lifecycle methods (onActivityPaused, onActivityStopped etc)
answered Nov 27 '18 at 4:31
Vikash BijarniyaVikash Bijarniya
1368
1368
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53491673%2fhow-to-check-whether-a-activity-is-foreground-and-bring-it-to-background-when-it%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown