Simple Notification in Android

-
Image
Notifications are a way to provide information to your customer which displays as a pop up on the device. It helps you to keep in touch with your customer. I am going to create a simple notification without going deep because everything is available on Google. We must understand a few concepts before going further. Notification channel:  Assume you have developed an app for an online learning center where they teach Maths and English. Students can either learn Maths, English, or Both. we must send notification related to Maths to only students who have taken Maths. In this case, we can create channels for Maths, English, and both so triggered notification will be delivered to students who have taken that subject. Each Notification channel can have a different Notification sound and different behavior that you can change from the Notification setting page. I forgot to tell you that Google has introduced the Notification channel from Android 8.0 i.e API level 26. Now yo...
Post a Comment

Difference between Handler and AsyncTask

-
The Handler is associated with the application’s main thread. it handles and schedules messages and runnables sent from background threads to the app main thread.

AsyncTask provides a simple method to handle background threads in order to update the UI without blocking it by time consuming operations.
exapmle:if you want to download something and while downloading you can show ProgressDialog to user without interupting the execution of main ui thread.

Both can be used to update the ui from background thread.
You may consider using handler it you want to post delayed messages or send messages to the MessageQueue in a specific order.


You may consider using AsyncTask if you want to exchange parameters (thus updating UI) between the app main thread and background thread in an easy convinient way.


Comments

Post a Comment

Popular posts from this blog

Webview data directory for Android 9 (Pie)

-
Image
From Crashlytics report, i got to know that my app is crashing on Android 9 devices. After checking stacktrace log, it was related to data directory of webview running in multiprocess . Webview data directory store cookies, HTTP caches, and other persistent and temporary storage related to web browsing. java.lang.IllegalStateException: Can't set data directory suffix: WebView already initialized After reading Google documentation, It was clear that from android 9 webview running in multiprocess can not share same data directory so we have to make sure that webview in each process must have it’s own data directory which we can set by calling Webview.setDataDirectorySuffix(). To fix this issue, I have updated my application to check if my current process is other then my main process so i will set data directory to webview. By default, applications component run in a single  process  until and unless you run component in another  process . You can specify the pro...
Read more

Tabs in Android

-
You need to use a TabHost and a TabWidget. The TabHost must be the root node for the layout, which contains both the TabWidget for displaying the tabs and a FrameLayout for displaying the tab content.TabHost allows the user to create tabs. main.xml:     <?xml version="1.0" encoding="utf-8"?> <TabHost xmlns:android="http://schemas.android.com/apk/res/android"         android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:id="@+id/LinearLayout01" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/bckground" android:orientation="vertical" android:padding="5dp" > <TabWidget    android:id="@android:id/tabs"    android:layout_width="fill_parent...
Read more

DatePicker in Android

-
Using DatePicker user can set a specific date by setting the day,month and year of DatePIcker.I am going to show you an example,There will be two buttons btnset and btndisplay.When user will click on btnset it will display  a dialog box and user will select the date and after selecting date when user will click on btndisplay it will display the date previously selected by user. 1.) Create a Project DatePickerExample. 2.) Create a date_picker.xml in res/layout. 3.) Put the following code in date_picker.xml :       <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"   > <Button    android:id="@+id/btnset"    android:layout_width="wrap_content"    android:layout_height="wrap_content...
Read more