Dynamic Views | Programmatically add, remove and control view items | #dynamic #views #android #java

where is app:cardCornerRadius comes from?

it gives me this error during the run time when i click on the button to strart the activity where the scroll layout is

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.dietapp, PID: 21413
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.dietapp/com.example.dietapp.Peso}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3194)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:163)
at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:174)
at android.content.Context.obtainStyledAttributes(Context.java:738)
at androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor(AppCompatDelegateImpl.java:922)
at androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor(AppCompatDelegateImpl.java:889)
at androidx.appcompat.app.AppCompatDelegateImpl.findViewById(AppCompatDelegateImpl.java:691)
at androidx.appcompat.app.AppCompatActivity.findViewById(AppCompatActivity.java:264)
at com.example.dietapp.Peso.<init>(Peso.java:22)
at java.lang.Class.newInstance(Native Method)
at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95)
at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:45)
at android.app.Instrumentation.newActivity(Instrumentation.java:1243)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3182)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409) 
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) 
at android.os.Handler.dispatchMessage(Handler.java:107) 
at android.os.Looper.loop(Looper.java:214) 
at android.app.ActivityThread.main(ActivityThread.java:7356) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

Can I use constrain layout instead of relative layout?

Uffff so Helpfull!!!!!!!!!!!! Thanks!!!!!!!!!

How i can delete ConstraintLayout.LinearLayout object?

This helps a lot. Thank you!

At the end you don't show any app emulator, that's bad

great job
it's problem that remove all data in container when close the app plz help me for the solve

Thank you so much! This is what I'm looking for

how to edit view

Hi, thank you for the tutorial! can I ask if there is a way to delete all views at once with a button?

Great video, How could I store what has been created using sharedprefs

I don't know why . But my code did not work. I write same as you. But my app crashed when i clicked on ok in dialog

Hello, thank you so much for this great tutorial!
I'm wondering, if I want to have a number on the left side (starting with 1 to n) that is increasing with every card that I add, how could I accomplish that?

Este video es justo lo que buscaba
Bueno, casi pero suficiente para hacer lo que tengo en mente

how to save these added views...on closing the app and opening again my added views are deleted ....

thanks but How can I clean up edittext after the first addition item

Hi, thank u so much this is very helpful. I wish you could do a tutorial where it retrieves and stores the data from and to a SQLite database

Can we make those cards permanent on even when you restart your app

Great job! but why did you create the AlertDialog dialog object? thx