what is dollar sign do in the manifest.xml - java

Some explanations
I was looking for gaining administration permission from user in android and found this. In Developing a Device Administration Application section it gives the text below for the manifest.xml file.
<activity android:name=".app.DeviceAdminSample"
android:label="#string/activity_sample_device_admin">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.SAMPLE_CODE" />
</intent-filter>
</activity>
<receiver android:name=".app.DeviceAdminSample$DeviceAdminSampleReceiver"
android:label="#string/sample_device_admin"
android:description="#string/sample_device_admin_description"
android:permission="android.permission.BIND_DEVICE_ADMIN">
<meta-data android:name="android.app.device_admin"
android:resource="#xml/device_admin_sample" />
<intent-filter>
<action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
</intent-filter>
</receiver>
The question
What is '.app.DeviceAdminSample$DeviceAdminSampleReceiver' and what is dollar sign in middle of it?
I'd read some other questions about dollar sign in java but i think mine is a bit different with them.


I think dollar sign should be the same as java,the later one is the previous inner class,maybe you just think more.

Related

How to add a Login Page/Activity to a Pre-Existing Main Activity? [duplicate]

I have created the meat and guts of my application but I want to add a different activity that will be the starting point (sort of a log-in screen).
Couple questions:
1 I have a fairly decent handle on how to switch between activities (based on this article: http://www.linux-mag.com/id/7498) but I'm not sure how to go about creating a new one (with eclipse).
2 Once I have a new activity created, how can I set it as the default activity of my application? I presume I could just change the name of the classes...but is there a more elegant way to handle that (maybe within the AndroidManifest.xml)?

Yes, you use the AndroidManifest.xml file. You can actually even have more than one launcher activity specified in your application manifest. To make an activity seen on the launcher you add these attributes to your activity in the manifest:
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>

Go to AndroidManifest.xml in the root folder of your project and change the Activity name which you want to execute first.
Example:
<activity android:name=".put your started activity name here"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

If you are using Android Studio and you might have previously selected another Activity to launch.
Click on Run > Edit configuration and then make sure that Launch default Activity is selected.

<application
android:icon="#drawable/YOUR_ICON" <!-- THIS ICON(IMAGE) WILL BE SHOWN IN YOUR APPS -->
android:label="MY APP NAME " > <!-- HERE LABEL(APP NAME) -->
<activity
android:name=".application's starting activity" <!-- (.)dot means current dir, if your activity is in another package then give full package name ex: com.xxx.Activity -->
android:label="LABEL FOR ACTIVITY "
android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

Follow to below instructions:
1:) Open your AndroidManifest.xml file.
2:) Go to the activity code which you want to make your main activity like below.
such as i want to make SplashScreen as main activity
<activity
android:name=".SplashScreen"
android:screenOrientation="sensorPortrait"
android:label="City Retails">
</activity>
3:) Now copy the below code in between activity tags same as:
<activity
android:name=".SplashScreen"
android:screenOrientation="sensorPortrait"
android:label="City Retails">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
and also check that newly added lines are not attached with other activity tags.

This is easy to fix.
Changes to the Launcher activity are also stored in the Debug configuration.
Go to Run > Debug Configurations and edit the setting.
There is also a similar setting in Intellij under Run > Edit Configurations select Run default Activity and it will no longer save the setting in this fashion.

It's simple. Do this, in your Manifest file.
<activity
android:name="Your app name"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>

<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

Just go to your AndroidManifest.xml file and add like below
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
then save and run your android project.

You add this you want to launch activity
android:exported="true" in manifest file like
<activity
android:name=".activities.activity.MainActivity"
android:windowSoftInputMode="adjustPan"
android:exported="true"/>
<activity
Open java file of this activity and right click then click on Run 'main Activity'
OR
Open java file of this activity and press Ctrl+Shift+F10.

In a recent project I changed the default activity in AndroidManifest.xml with:
<activity android:name=".MyAppRuntimePermissions">
</activity>
<activity android:name=".MyAppDisplay">
<intent-filter>
<action android:name="android.intent.activity.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
In Android Studio 3.6; this seems to broken. I've used this technique in example applications, but when I use it in this real-world application it falls flat. The IDE once again reports:
Error running app: Default activity not found.
The IDE still showed a configuration error in the "run app" space in the toolbar (yellow arrow in this screenshot)
To correct this error I've tried several rebuilds of the project, and finally File >> "Invalidate Cache/Restart". This did not help. To run the application I had to "Edit Configurations" and point at the specific activity instead of the default activity:

In AndroidManifest.xml
I changed here the first activity to be MainActivity4 instead of MainActivity:
Before:
<activity android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity2" />
<activity android:name=".MainActivity3" />
<activity android:name=".MainActivity4" />
<activity android:name=".MainActivity5" />
<activity android:name=".MainActivity6"/>
After:
<activity android:name=".MainActivity" />
<activity android:name=".MainActivity2" />
<activity android:name=".MainActivity3" />
<activity android:name=".MainActivity4" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity5" />
<activity android:name=".MainActivity6"/>

For anyone getting errors in their debug\AndroidManifest.xml file make sure that you include the tag!
"<activity android:name=".MainActivity>"
For example:
<activity android:name=".MainActivity"><intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter></activity>

Android App Won't Remember USB Permission

I am trying to stop the app I am working on from asking for USB permissions each time the USB device is disconnected. I have followed: USB device access pop-up suppression? without much luck.
The app does remember the USB device until the device is unplugged.
If it matters I am trying to connect the app to an Arduino Teensy.
This is what my manifest activity looks like
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter> <!-- For receiving data from another application -->
<action android:name="android.intent.action.SEND" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain" />
</intent-filter>
<intent-filter>
<action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"/>
</intent-filter>
<meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="#xml/usb_device_filter" />
</activity>
</application>
And here is my usb_device_filter file:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<usb-device vendor-id="--hidden--" product-id="--hidden--" />
</resources>
Any help is welcome.
EDIT: I also look over at the Android Developer page and they say when using an intent filter for USB connections: If users accept, your application automatically has permission to access the device until the device is disconnected.
I would also like to point out that the suggested duplicate does not have the same issue as I am trying to solve. Their problem is having two activities while my problem deals with just one.
https://developer.android.com/guide/topics/connectivity/usb/host

We ended up opening the app automatically when the USB is inserted into the phone, because our project deals with the app being open all day.
The app only asks for permission to use the USB once for the phone and remembers it now, as long as the user connects the USB before opening the app and the phone is unlocked. The phone even remembers the permission after the phone is restarted.
This is kind of a work around, but it works for our needs. Hopefully this will help some others with the same problem.

As the asker here says, For your perpose (if I understood correctly) the following should be enough. That's right that he had a different problem but he started hes question saying that for your case it's working.
<activity android:name=".FirstActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
</intent-filter>
<meta-data
android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
android:resource="#xml/usb_device_filter" />
</activity>

How can I use Vulkan in Android with my own Activity?

I have downloaded googlesamples: vulkan-basic-samples, compiled and executed this samples. Howevew ,I found all of this samples specified a NativeActivity in their AndroidManifest.xml, such as:
<!-- Our activity is the built-in NativeActivity framework class.
This will take care of integrating with our NDK code. -->
<activity android:name="android.app.NativeActivity"
android:label="#string/app_name"
android:configChanges="orientation|keyboardHidden">
<!-- Tell NativeActivity the name of or .so -->
<meta-data android:name="android.app.lib_name"
android:value="vulkan_samples" />
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
But I want to use my own Activity(in Java), please tell me How.
Thanks!

How to detect POS transaction in Android Wallet Application?

I am developing Android Wallet application using SEEK API and NFC. I have the Visa applet installed in the Sim card. My question is, How to detect if a successful/unsuccessful contact is made to the POS terminal? Is there any Intent Action available in Android that I can put in some activity or some receiver?
Thanks.

Actually I Found the way of detecting POS terminal transaction. The NFC API, TRANSACTION_DETECTED is hidden. When transaction is there, TagDetectedActivity will launch.
<activity android:name=".TagDetectedActivity" android:launchMode="singleTask">
<intent-filter>
<action android:name="android.nfc.action.TRANSACTION_DETECTED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="nfc" android:host="secure" android:port="0" android:pathPrefix="/axxxxx" />
</intent-filter>
<intent-filter>
<action android:name="com.gsma.services.nfc.action.TRANSACTION_EVENT" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="nfc" android:host="secure" android:port="0" android:pathPattern="/.*/axxxxx.*" />
</intent-filter>
</activity>

How to detect/read NFC tag in service

How can I read NFC tag in background via service? I already can read it in activity(I've found some source codes but I don't really understand how it works) but I can't find anything about reading it in Service or Runnable.
Thanks for help

Finally i figured out how to solve it. I have to use these intent filters in AndroidManifest.xml to properly run my activity.
<intent-filter>
<action android:name="android.nfc.action.TECH_DISCOVERED"/>
<meta-data android:name="android.nfc.action.TECH_DISCOVERED" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.TAG_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>

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