When Android backgrounds an application it creates a screenshot of the current screen. The screenshot is displayed when you click the Overview button.
Is there a way to prevent this backgrounding screen shot (as if I'd used FLAG_SECURE), but allow the users to take screenshots?
You can configure not to show your activity in recent list. Add following code in manifest :
<activity
.....
android:excludeFromRecents="true"
...../>
Or from java code startActivity with flag:
intent.setFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
Or,
<activity
.....
android:noHistory="true"
...../>
Try this https://stackoverflow.com/a/49442984/5939067 .
The solution above simply sets the secure flag when your app goes background, and clears it when it resumes(so you can take the screenshot while using the app).
It works perfectly for me. I tested with Samsung Galaxy 9+(Android 9), LG V30(Android 8) and LG G7 ThinQ(Android 8).
Is activity title or name visible to users in recent apps screen in some version of android?
It is the application name that is visible to user. No matter what the title is!
You can set it from AndroidManifest.xml in the application section. Reference.
<application>
android:label="App name here"
...
</application>
I have an app with a difficult name that the system's built-in speech recognizer is not able to properly understand. For this reason, assuming that my app is called X, I would like to be able to launch it by saying "Start Y."
As described in the official documentation, the name of the app is defined in the manifest:
<application
...
android:label="X" > ... </application>
while the text to say after the "Start" command is defined here:
<activity
...
android:label="Y" > ... </activity>
However in doing so the name of the app in the app list becomes Y, while I would like it to remain X...
The only thing you can do is to use an activity alias with a different label. In this case the user will see two icons in the list.
hey guys
i change the package name in manifest file so that i have a separate package for all the activities and it is giving me error classnotfoundexception when although the classes shown in log cat are present in my source folder.
i even then changed the package name to previous one. and still it is giving me the same error.
In your manifest file, if the package address of the activity contains a relative namespace address (starting with a dot) like this:
<activity
android:name=".addr.MainActivity"
</activity>
you can get it to work by changing it to the full address like this:
<activity
android:name="com.pkg.addr.MainActivity"
</activity>
I have an existing android app.
I added a simple widget to it using the following:
updated my manifest with a <receiver> block which provides information about my AppWidgetProvider implementation
added a new xml files in res/xml with a <appwidget-provider> element that contains the height/width/updatePeriod/initialLayout/icon/label attributes
added a simple default layout with an ImageView and a TextView
implemented my AppWidgetProvider
When I build and deploy this to the emulator my Widget doesn't show up in the list of widgets. Am I missing some step to 'install' the widget? Do I need to do anything special to make it appear in the emulator?
EDIT:
Here's what my manifest receiver looks like:
<receiver android:name=".MyAppWidgetProvider"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="#xml/my_appwidget_info" />
</receiver>
and here's what my my_appwidget_info.xml looks like:
<?xml version="1.0" encoding="UTF-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:icon="#drawable/ic_logo"
android:label="MySampleApp"
android:minWidth="294dp"
android:minHeight="72dp"
android:updatePeriodMillis="86400000"
android:initialLayout="#layout/my_app_widget" >
</appwidget-provider>
Does your receiver tag in the manifest have the proper intent-filter and meta-data? It should look like the example in the documentation:
<receiver android:name="MyAppWidgetProvider" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="#xml/my_appwidget_info" />
</receiver>
The receiver needs both of those pieces to be recognized as an app widget.
Edit: The <receiver> tags also need to be located inside the <application> tags.
If your app is installed on the SD card, all your widgets will quietly refuse to show up in the list. (The docs do make it clear that you can't have widgets if you're on the external storage).
You can go to the settings in the home screen, go to Applications, and go to your app. If it offers you to "Move to phone", then it is on the SD card. You can set the install location to internalOnly to prevent it from going onto the SD card.
If you do allow installation on SD card (because users will typically ask for that), they need to be clear that they can't have the widget in that case. If an app is on SD card and you want to use the widget, you first have to move the app back to internal storage and then reset the phone (!).
I had the same issue as well. A few things to check that can stop it from showing up on different models.
1)Must have a minHeight and minWidth set on AppWidget-Provider in the xml, if you remove either of those and launch in emulator, your widget will be gone.
2)Some models have issues if you don't supply a previewImage in the AppWidget-Provider
3)Some models can have issues if you install on the SD Card rather than internally, although I still prefer to install on SD Card.
4)Some models need to have an Activity with Main and Launcher defined even if you don't intend on using any Activities. (You can simply make a dummy one that says 'this is a widget app only'
5)You have to have your manifest setup correctly as shown in TinJa's answer.
I fought through this for quite a while before finally getting it to show up in all models and emulators, so be patient, make sure you aren't missing anything and set the values that need to be there. Remember some phones cache the Widget List and may not update until you have launched your first Activity or Rebooted the phone.
Hope that helps.
Sam
I had the same problem then I finally figure it out. Usually when you emulate an application, it has an activity to load. For a widget-only app, that isn't the case, but the IDE still thinks you're trying to launch an activity.
To change this go to your Build Options
then change the Launch Options to Nothing
I had the same problem. It turned out I accidentally had two meta-data resource xml files in two different folders, my "layout" folder and my "xml" folder. It was finding the (empty) resource in "layout" first, and using that for its meta-data.
It was a stupid mistake, but make sure you have only one xml file of that name that's pointed to in your receiver meta-data tag. Also I think it should always be in the xml folder.
I had the same problem.
And my problem was that I have /layout/main.xml file when I delete it the widget appear!
It sound like #ubzack answer but I think he talk about something else [same xml file name]