My Problem:
In MainActivity I start to download some data from the Internet via XML Parser. This data is displayed on every Screen of my App. It is like a Database.
While downloading and saving data, the user of the App can navigate through the hole app. If downloading and saving data is finished, I want to detect and reload the current foreground Activity. I need to do this, to display the new data.
I can detect the current Activity with the ActivityManager and can start it with the ComponentName with the method "startActivity(Intent.makeMainActivity(componentName)". But then the old activity is also there when I navigate back with the ActionBar-BackButton.
I do this in the AsyncTasks onPostExecute-Method after downloading Data.
Any Ideas how to do it?
protected void onPostExecute(MainActivity.UrlParams result) {
Toast.makeText(result.contextMain, "Daten wurden erfolgreich aktualisiert!", Toast.LENGTH_LONG).show();
//Aktualisiert aktive Activity damit die neuen Daten angezeigt werden!
ActivityManager am = (ActivityManager) result.contextMain.getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
Log.d("topActivity", "CURRENT Activity ::" + taskInfo.get(0).topActivity.getClassName());
ComponentName componentInfo = taskInfo.get(0).topActivity;
componentInfo.getPackageName();
Intent intent = Intent.makeMainActivity(componentInfo);
result.contextMain.startActivity(intent);
//myApp.getCurrentActivity().set
}
Download your data is service, not in AsyncTask
Register some BroadcastReceiver in your MainActivity in onStart(), and unregister it in onStop(). Refresh your view in this receiver
When data are downloaded, make a broadcast to call activity, that data are ready.
Disadvantage of this method is that you should save your data somewhere. You can of course pass data in the intent, but only if data are small
Related
i have an app with service that works completely background, but sometimes i need to change the content in the foreground activity , for now let's say i want to show Toast.
first i am checking if the app is opened as foreground
public boolean isForeground(String myPackage) {
ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> runningTaskInfo = manager.getRunningTasks(1);
ComponentName componentInfo = runningTaskInfo.get(0).topActivity;
return componentInfo.getPackageName().equals(myPackage);
}
then i want to know what is the running activity
String PKG_Name = componentInfo.getPackageName();
this will give me the name , but what i want is to is get the object Activity ,to do something like this:
activity.runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(activity, "Hello", Toast.LENGTH_SHORT).show();
}
});
how can i do it? if not possible, is there's a way to is to send a signal or a message to the service to tell the it?
For that you have two options, if you are fine showing just a Toast and not interact with other elements, you can implement a broadcast reciever and make your custom intent with custom action,
Intent int= new Intent(); int.setAction("Your custom string here");
and then post a toast in your braodcast reciever,
OR
you can use a custom handler to interact with all the objects in foreground and activity, here's some study material for it,
https://developer.android.com/training/multiple-threads/communicate-ui
I wand a Broadcast receiver invoke when another applications a particular activity is opened in android. For example When Navigation page in Map application that installed in android phone, When opened and showing the Navigation, I want to show a Toast that display "Currently showing Navigation". So how can I achieve that?
This below code will help you to identify windo change event
public class AccessibilityEventService
extends AccessibilityService {
#Override
public void onAccessibilityEvent(AccessibilityEvent event) {
if (event.getEventType() == AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED)
Log.i("op",event.getPackageName());
}
}
but it has to enabled by users from Accessibility under settings.
or You can check current top activity in a time gap using following code
ActivityManager am = (ActivityManager) this.getSystemService(ACTIVITY_SERVICE);
// get the info from the currently running task
List< ActivityManager.RunningTaskInfo > taskInfo = am.getRunningTasks(1);
Log.d("topActivity", "CURRENT Activity ::"
+ taskInfo.get(0).topActivity.getClassName());
ComponentName componentInfo = taskInfo.get(0).topActivity;
componentInfo.getPackageName();
As my understood that you need to show a toast on onRecieve Fuunction
Toast.makeText(context,"your text",2000).show();
//context is input parameter from onRecieve function
In my app i want to check whethere any other app launches or not from my app.So i am currently usimg Activitymanager to find the top activity like this
ActivityManager am = (ActivityManager) this.getSystemService(ACTIVITY_SERVICE);
List< ActivityManager.RunningTaskInfo > taskInfo = am.getRunningTasks(1);
Log.d("topActivity", "CURRENT Activity ::"
+ taskInfo.get(0).topActivity.getClassName());
ComponentName componentInfo = taskInfo.get(0).topActivity;
componentInfo.getPackageName();
But i want to run this code in background service.So that i can detect When other app launches through this.So is there any idea to do this.Plz help me.thanks
By using service you can achieve this..
public void checkActivity() {
handler = new Handler();
activityRunnable = new ActivityRunnable();
handler.postDelayed(activityRunnable, 500);
}
private class ActivityRunnable implements Runnable {
#Override
public void run() {
ActivityManager manager = (ActivityManager) getApplicationContext()
.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningTaskInfo> runningTasks = manager.getRunningTasks(1);
if (runningTasks != null && runningTasks.size() > 0) {
ComponentName topActivity = runningTasks.get(0).topActivity;
// Here you can get the TopActivity for every 500ms
if(!topActivity.getPackageName().equals(getPackageName())){
// Other Application is opened
}
handler.postDelayed(this, 500);
}
}
}
Call the checkActivity() in onCreate of service and dont forgot to remove the handler.removeCallbacks(activityRunnable); callbacks in onDestroy
start the service in LauncherActivity onCreate and stop the service in LauncherActivity onDestroy
Note: Dont forgot to add the permission in your manifest
<uses-permission android:name="android.permission.GET_TASKS" />
You should use Service for this. Then only you can achieve the background process..Please Go through about Services http://developer.android.com/guide/components/services.html and you can see this also http://www.vogella.com/articles/AndroidServices/article.html both URLs will help you
instead of service Use receiver to receive the launch event
and there you can implement this code.
The approach you are taking is wrong and prone to have your app rejected from the Google Play Store (plus it may stop working).
Check this thread to see possible ways to detect wether your app went to the background or not.
I have a broadcast receiver which receives for internet connectivity..and as soon as it doesn't find any connection it opens up my splash activity saying "NO INTERNET CONNECTION"....till now everything is ok but when user put the application into background using device home button and then off the internet connection the splash activity comes to foreground while the app was running in background. I don't want this to happen the splash activity should open but in the background only.
#Override
public void onReceive(Context context, Intent intent) {
// SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
boolean isNetworkDown = intent.getBooleanExtra(
ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
if (isNetworkDown) {
Log.d(TAG, "onReceive: NOT connected, stopping UpdaterService");
Intent myintent=new Intent(context,NoConnectivity.class);
myintent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(myintent);
} else
{
Log.d(TAG, "onReceive: connected, starting UpdaterService");
NoConnectivity.h.sendEmptyMessage(0);
}
}
startActivity will automatically bring the activity to the foreground on top of whicever activity you are viewing. User can go back to the previous one using back button. That's the usual way things work.
However, you can use moveTaskToBack(true) to send your activity to background.
Here is the function description.
EDIT
Check out this question and use the solution to see if your activity is in the background. If yes, then use the method I advised above to send the new activity to the background.
if (isNetworkDown) {
Log.d(TAG, "onReceive: NOT connected, stopping UpdaterService");
// Check the foreground package
ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> runningTasks = activityManager.getRunningTasks(1);
ComponentName topActivity = runningTasks.get(0).topActivity;
String foregroundPackageName = topActivity.getPackageName();
if(foregroundPackageName.equals(context.getPackageName()) {
Intent myintent = new Intent(context,NoConnectivity.class);
myintent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(myintent);
}
}
I want to get the foreground activity running. And I am able to get this information by using activity manager by using following code.
activityManager = (ActivityManager) FWCommon.getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);
runningTaskInfoList = activityManager.getRunningTasks(1);
componentName = runningTaskInfoList.get(0).topActivity;
Suppose I have two activities A and B and i call this above code from onResume() of both activities A and B.
Following is the problem
When activity A starts above code gives me topActivity = A
Then I move from activity A to B and above code gives me topActivity = B
Then i press Back to move back from activity B to A and above code again gives me topActivity = B instead of A.
Thx
Dalvin
Try using getRunningAppProcesses() to get a list of RunningAppProcessInfo. Then go through each RunningAppProcessInfo and check if it is in the foreground by doing this:
List<ActivityManager.RunningAppProcessInfo> processes = manager.getRunningAppProcesses();
for (ActivityManager.RunningAppProcessInfo process : processes)
{
// Take a look at the IMPORTANCE_VISIBLE property as well in the link provided at the bottom
if (process.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND)
{
// Put code here
}
}
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